ProxySQL 4.0.6 (AI/MCP Tier)

ProxySQL 4.0.6 Release Notes

Release date: 2026-03-10

ProxySQL 4.0.6 is the first release of the AI/MCP Tier, introducing experimental generative AI and agentic features directly into the database proxy. It incorporates all improvements from ProxySQL 3.1.6 while adding a native Generative AI Module, a Model Context Protocol (MCP) stack, and an Anomaly Detection subsystem. This version is built using PROXYSQLGENAI=1 and requires the Rust toolchain.

Release commit: 3803f11077f21510b2b43ea7168abf91b54b739e

Highlights (AI/MCP Tier)

• Generative AI Integration: Native bridge to large language models (LLMs) with support for query analysis, routing, and translation.
• Model Context Protocol (MCP): A full MCP server implementation, allowing ProxySQL to act as a data source and tool provider for AI agents.
• RAG (Retrieval-Augmented Generation): High-performance vector ingestion and similarity search subsystem using sqlite-vec.
• Intelligent Anomaly Detection: AI-driven threat detection that identifies abnormal query patterns and potential security risks using semantic analysis.
• AI-Assisted Database Discovery: Automated schema exploration and question learning to help AI agents understand complex database structures.

New Features (4.0.x)

Generative AI & LLM Bridge

Native LLM Connectivity (ae4200d, #5339, #5423)
ProxySQL 4.0.6 introduces a native bridge to interact with external LLMs (e.g., OpenAI, Anthropic, or local models). This includes a generic provider interface, allowing administrators to configure API keys and model parameters via genai_variables. The bridge supports asynchronous LLM calls, ensuring that proxy performance is not blocked during AI processing.

Semantic Query Translation (NL2SQL) (a7dac5e, #5339)
An experimental "Natural Language to SQL" (NL2SQL) converter has been implemented, enabling ProxySQL to translate human-readable descriptions into valid database queries. This is integrated directly into the MySQL_Session handler, allowing for transparent query interception and translation.

Model Context Protocol (MCP) Stack

Native MCP Server (c8a6048d, #5312, #5339)
Implemented a comprehensive MCP server stack that supports both HTTP/HTTPS and stdio transports. This allows ProxySQL to seamlessly integrate with AI agent environments like Claude Code or Cursor. ProxySQL can now expose database schemas, query tools, and diagnostic information as standardized MCP tools.

Multi-Agent Database Discovery (aed042b, #5339)
A sophisticated multi-agent discovery system that uses specialized AI agents (e.g., Security, Metadata) to explore and document database structures. The system generates a comprehensive "Question Catalog" and "Discovery Report," providing AI agents with the necessary context to interact with the database effectively.

Retrieval-Augmented Generation (RAG)

Vector Embedding & Similarity Search (bcefd09, #5423, #5318)
The RAG subsystem provides high-performance storage and retrieval for vector embeddings. Integrated with sqlite-vec, it allows ProxySQL to perform fast semantic similarity searches across database artifacts. This is used to provide context-rich data to LLMs during agentic workflows.

Advanced RAG Ingestion Pipeline (79ee743, #5334, #5330)
The rag_ingest tool has been rewritten to use the MySQL protocol, allowing for high-performance ingestion of documents and data directly into ProxySQL's internal storage. It supports incremental syncing with watermark tracking and detailed logging for auditing.

Intelligent Anomaly Detection

Semantic Threat Identification (52a70b0, #5339)
The new Anomaly Detection subsystem uses AI-driven analysis to identify suspicious query patterns that traditional rule-based systems might miss. It can detect abnormal query structures, potential SQL injection attempts, and unauthorized access patterns by comparing query fingerprints against a database of known threat vectors using semantic similarity.

Features Inherited from v3.1.6 (Innovative Tier)

ProxySQL 4.0.6 includes all features from the v3.1.6 (Innovative) and v3.0.6 (Stable) releases, including:

• Innovative Tier Features: TSDB for historical metrics and FFTO for fast-forward traffic visibility (#5383, #5410).
• Core Stability: All security fixes and protocol hardening from the Stable Tier (#5348, #5429).
• Cross-Platform Support: Full macOS and Fedora 43 compatibility (#5308, #5329).

For a detailed list of these core improvements, please refer to the ProxySQL 3.0.6 Release Notes.

Contributors

ProxySQL is a community-driven project, and we are grateful to all the contributors who helped make this release possible. A special thank you to:

• @rahim-kanji for the extensive work on PostgreSQL protocol hardening and meta-command support.
• @wazir-ahmed for implementing the TSDB subsystem and MCP stack.
• @JavierJF for adding PostgreSQL replication lag monitoring and improving diagnostics.
• @Gonlo2 for critical fixes in connection pool management and SSL handling.
• @mirostauder for build system improvements and Fedora 43 support.
• @evkuzin for enhancing Prometheus metric observability.
• @orbisai0security for identifying and fixing security vulnerabilities.
• @mevishalr for performance optimizations in query logging.

We also thank everyone who reported bugs, tested experimental features, and provided feedback during this release cycle.

Hashes

The release commit is: 3803f11077f21510b2b43ea7168abf91b54b739e

SHA256s:

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1583dd...

ProxySQL 3.1.6 (Innovative Tier)

ProxySQL 3.1.6 Release Notes

Release date: 2026-03-10

ProxySQL 3.1.6 is the first release of the Innovative Tier, introducing revolutionary observability features built directly into the proxy. It incorporates all improvements from ProxySQL 3.0.6 while adding the Embedded Time-Series Database (TSDB) and the Fast Forward Traffic Observer (FFTO). This version is built using PROXYSQL31=1.

Release commit: 3803f11077f21510b2b43ea7168abf91b54b739e

Highlights (Innovative Tier)

• Embedded Time-Series Database (TSDB): A native, high-performance metric storage subsystem capable of recording historical performance data for long time.
• Fast Forward Traffic Observer (FFTO): Deep observability for traffic in fast-forward mode, allowing administrators to inspect and analyze traffic that was previously "invisible" to ProxySQL's query logging.
• Native Monitoring Dashboard: A built-in web dashboard leveraging the TSDB to provide real-time and historical performance visualization.
• Comprehensive Release Tiers: Introduction of the tier-based build system to provide clear upgrade paths for stable, innovative, and experimental features.

New Features (3.1.x)

Embedded Time-Series Database (TSDB)

Native Metric Storage (f17e999, #5383, #5426)
ProxySQL 3.1.6 introduces a native, high-performance TSDB subsystem. This subsystem automatically samples and records internal metrics, backend health status, and query execution statistics. By storing this data in an optimized and embedded SQLite-based database, ProxySQL can provide historical performance analysis without requiring external monitoring infrastructure. Configuration is managed via the new tsdb- prefixed variables.

Historical Monitoring Dashboard (c73011b, #5383)
Leveraging the TSDB, ProxySQL now includes a built-in monitoring dashboard accessible via the HTTP server. This dashboard provides visual representations of backend health, connection pool utilization, and query latency over time, allowing for rapid identification of performance trends and anomalies.

Fast Forward Traffic Observer (FFTO)

Visibility for Fast-Forwarded Traffic (3a3be5a, #5410)
In previous versions, traffic routed through ProxySQL in "fast-forward" mode (direct packet-level forwarding) bypassed the query logging and statistics gathering modules. FFTO addresses this limitation by implementing a non-blocking observer that analyzes the packet stream in real-time. This provides visibility into query patterns and execution counts even for traffic that is being forwarded with minimal overhead.

Protocol-Aware Traffic Analysis (40aff57, #5410)
FFTO is fully compatible with both MySQL and PostgreSQL protocols. It can reconstruct query boundaries, identify statement types, and record metrics such as affected_rows and rows_sent for fast-forwarded sessions. This data is exposed through new statistics tables and can be exported to external monitoring systems.

Features Inherited from v3.0.6 (Stable Tier)

ProxySQL 3.1.6 includes all features, bug fixes, and improvements from the v3.0.6 release, including:

• Security Hardening: Secure SCRAM authentication replacing strtok usage (#5348).
• PostgreSQL Meta-Commands: Support for \d, \dt, \l in the Admin interface (#5367).
• Protocol Resilience: Hardened PostgreSQL protocol handling and malformed packet validation (#5429).
• macOS Support: Full compatibility with macOS (Darwin/Apple Silicon) (#5308).
• Prometheus Labels: Protocol-specific labeling for ambiguous metrics (#5361).

For a detailed list of these core improvements, please refer to the ProxySQL 3.0.6 Release Notes.

Contributors

ProxySQL is a community-driven project, and we are grateful to all the contributors who helped make this release possible. A special thank you to:

• @rahim-kanji for the extensive work on PostgreSQL protocol hardening and meta-command support.
• @wazir-ahmed for implementing the TSDB subsystem and MCP stack.
• @JavierJF for adding PostgreSQL replication lag monitoring and improving diagnostics.
• @Gonlo2 for critical fixes in connection pool management and SSL handling.
• @mirostauder for build system improvements and Fedora 43 support.
• @evkuzin for enhancing Prometheus metric observability.
• @orbisai0security for identifying and fixing security vulnerabilities.
• @mevishalr for performance optimizations in query logging.

We also thank everyone who reported bugs, tested experimental features, and provided feedback during this release cycle.

Hashes

The release commit is: 3803f11077f21510b2b43ea7168abf91b54b739e

SHA256s:

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ProxySQL 3.0.6 (Stable Tier)

ProxySQL 3.0.6 Release Notes

Release date: 2026-03-10

This release of ProxySQL 3.0.6 is a maintenance and stability release focusing on core protocol hardening, security fixes, and improved platform support. It brings significant improvements to PostgreSQL compatibility, MySQL monitoring, and internal diagnostic capabilities, alongside a major stabilization of the automated testing infrastructure.

Release commit: 3803f11077f21510b2b43ea7168abf91b54b739e

Highlights

• Security Hardening: Fixed a high-severity vulnerability in SCRAM authentication by replacing insecure strtok usage with thread-safe alternatives.
• PostgreSQL Compatibility: Added support for common psql meta-commands (like \d, \dt, \l) in the ProxySQL Admin interface and enhanced transaction state tracking for pipelined queries.
• Stability & Resilience: Hardened PostgreSQL protocol handling against malformed packets and unstable backends. Fixed multiple race conditions in admin shutdown and session cleanup.
• Observability: Added protocol-specific labels (mysql vs pgsql) to Prometheus metrics to eliminate ambiguity in shared metric families.
• Platform Support: Added official support for compilation on macOS (Darwin/Apple Silicon) and updated Linux distribution support to include Fedora 43.

New Features

PostgreSQL Enhancements

PostgreSQL Meta-Command Support (3145473, #5367, #5381)
The ProxySQL Admin interface (port 6132) now supports common PostgreSQL psql meta-commands, including \d, \dt, \di, \dv, and \l. This allows database administrators to describe tables, list views, and inspect database structures directly through ProxySQL using familiar PostgreSQL CLI syntax.

Replication Lag Monitoring for PostgreSQL (c4fc60b, #5422)
Introduced native replication lag monitoring for PostgreSQL backends. Administrators can now configure pgsql-monitor_replication_lag_interval and pgsql-monitor_replication_lag_timeout to track and report replication delays, enabling better traffic routing decisions based on data freshness.

Advanced PostgreSQL Query Logging (bad7ce4, #5391)
Implemented PostgreSQL advanced query logging with parity to the MySQL eventslog behavior. This includes a circular buffer for query events, automatic background dumping to disk, and dedicated administrative commands to manage the logging lifecycle.

Monitoring & Diagnostics

Protocol Labels for Prometheus Metrics (e82ff6f, #5361, #5443)
To improve visibility in hybrid MySQL/PostgreSQL environments, ProxySQL now attaches a protocol label to Prometheus metrics. This allows monitoring systems to distinguish between MySQL and PostgreSQL connection pools, query counters, and resource usage even when they share the same metric family names.

Administrative Statistics Flushing (77fe582, #5317)
Added the PROXYSQL FLUSH STATS administrative command, providing a unified way to reset internal statistics tables. This is particularly useful for performance benchmarking and troubleshooting transient issues.

Bug Fixes

Protocol Hardening

PostgreSQL Protocol Resilience (d305cde, #5429, #5421)
Hardened the PostgreSQL protocol pipeline with comprehensive validation of packet headers and message sequences. This prevents potential crashes or misrouting when encountering malformed packets or unexpected responses from unstable backend servers.

Late COPY Message Handling (16443dc, #5416)
Fixed an issue where ProxySQL could misinterpret pipelined COPY protocol messages arriving after a session had exited fast-forward mode. The protocol handler now correctly identifies and discards or processes these trailing messages to maintain session integrity.

Transaction State Tracking (96bc668, #5444, #5388)
Improved transaction state tracking for PostgreSQL pipelined queries and extended query protocol. This ensures that SET, RESET, and DISCARD commands are correctly reflected in the session state even when multiple operations are batched.

Core & Stability

Security: strtok Vulnerability (933168e, #5348, #5350)
Addressed a high-severity security vulnerability in the SCRAM authentication code. Replaced the non-thread-safe strtok function with a more secure implementation to prevent memory corruption in high-concurrency environments.

Session & Connection Cleanup (83209da, #5356, #abddff33, #5344)
Fixed a critical use-after-free race condition in RequestEnd() that could cause crashes during COM_CHANGE_USER timeout scenarios. Also corrected an off-by-one error in connection cleanup loops that could lead to the removal of the wrong connection from the pool.

Admin Shutdown Races (0654efd, #5371)
Implemented a more robust, coordinated shutdown sequence for the Admin interface. This eliminates race conditions during PROXYSQL KILL commands and ensures that all internal threads are gracefully terminated.

Improvements

• macOS Compatibility: Comprehensive build system updates to support compilation on macOS (Darwin/Apple Silicon), including fixes for header conflicts and OpenSSL detection (#5308).
• CI Infrastructure: Migrated the unified CI infrastructure directly into the ProxySQL repository, enabling more reliable and reproducible automated testing (#5442, #5435).
• Memory Safety: Fixed multiple uninitialized memory issues reported by Valgrind across the query parser and connection management modules (#5374).
• Build System: Updated Docker build images and improved Makefile logic for better reproducibility and package building across different Linux distributions (#5329, #5349).

Contributors

ProxySQL is a community-driven project, and we are grateful to all the contributors who helped make this release possible. A special thank you to:

• @rahim-kanji for the extensive work on PostgreSQL protocol hardening and meta-command support.
• @wazir-ahmed for implementing the TSDB subsystem and MCP stack.
• @JavierJF for adding PostgreSQL replication lag monitoring and improving diagnostics.
• @Gonlo2 for critical fixes in connection pool management and SSL handling.
• @mirostauder for build system improvements and Fedora 43 support.
• @evkuzin for enhancing Prometheus metric observability.
• @orbisai0security for identifying and fixing security vulnerabilities.
• @mevishalr for performance optimizations in query logging.

We also thank everyone who reported bugs, tested experimental features, and provided feedback during this release cycle.

Hashes

The release commit is: 3803f11077f21510b2b43ea7168abf91b54b739e

SHA256s:

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v3.0.5

ProxySQL 3.0.5 Release Notes

Release Date: 2026-01-15

This release of ProxySQL 3.0.5 delivers significant improvements in PostgreSQL SSL enforcement, security hardening, build performance optimization, and enhanced documentation. With critical fixes for SSL/TLS configuration handling, improved timezone parsing support, and streamlined development workflow optimizations, this release strengthens ProxySQL's reliability and usability for both MySQL and PostgreSQL deployments.

Release commit: 7e9e00997d7d9fa4811c86c3a3bec9c886386e1f

Highlights

This release focuses on several key areas:

• PostgreSQL Security Enhancements: Critical fixes ensure use_ssl configurations are properly enforced on frontend connections, preventing unauthorized connections when SSL is required.
• Security & Reliability Improvements: Hardening against timezone parsing vulnerabilities and fixing critical bugs in file descriptor handling for fork/exec scenarios.
• Development Workflow Optimization: Significant performance improvements for development builds by preserving test dependencies during clean operations.
• Documentation & Testing: Comprehensive documentation updates and expanded test coverage to ensure robust functionality across different deployment scenarios.

Enhancements & Fixes

Security & Compatibility Improvements

PostgreSQL SSL Enforcement (876d4ad, #5285)
Fixes critical security vulnerability where clients could bypass SSL requirements even when use_ssl=1 was configured. Ensures frontend connections properly respect SSL configuration for PostgreSQL users, preventing unauthorized connections. Includes proper value assignment from pgsql_users to sessions and adds regression testing.

Version Forwarding Control (591e1bc, #5277)
Adds mysql-select_version_forwarding global variable to restore SQLAlchemy and ORM compatibility. Fixes the issue introduced in v3.0.4 where SELECT VERSION() queries returned ProxySQL's internal version instead of forwarding to backend servers.

Protocol & Parser Enhancements

Enhanced Timezone Parsing (ef872c7, #5280)
Improves MySQL SET statement parser to handle complex timezone configurations, including three-component IANA names (e.g., America/Argentina/Buenos_Aires) and hyphenated timezone names. Resolves parsing errors for SET time_zone statements with modern timezone formats.

PostgreSQL Bind Packet Fix (c6ed5b9, #5282)
Fixes malformed Bind packets in PostgreSQL extended query protocol when clients provide single parameter format. Resolves protocol violations and connection failures caused by improper handling of single-element parameter format arrays.

Fork/Exec Safety Improvements (e6cbdca, #5276)
Fixes critical bugs in close_all_non_term_fd() function that caused undefined behavior and potential deadlocks in multi-threaded programs when called after fork() before execve(). Ensures proper file descriptor handling for processes that spawn child processes.

Improvements

Performance & Build Optimization

Build Performance Improvements During Clean Operations (a8e759c, #5289)
Significant performance enhancements for development workflow by optimizing the make clean behavior to preserve expensive-to-rebuild test dependencies. This change eliminates the need to rebuild the entire cpp-dotenv dependency during clean operations, reducing development cycle times and improving productivity for developers working with ProxySQL's test suite.

Enhanced SQLite Mathematical Function Support (4cf85d3, #5262)
Enables the SQLITE_ENABLE_MATH_FUNCTIONS compile flag to provide mathematical function support in SQLite queries through ProxySQL's SQLite interface. This enhancement expands the capabilities of ProxySQL's embedded SQLite database for query analysis and caching operations, supporting functions like abs(), round(), and other mathematical operations.

Security & Reliability

Parameterized Prepared Statements in REST API (af23187, #5270)
Implements parameterized prepared statements in the REST API for safer SQL execution. This enhancement replaces direct SQL string concatenation with parameterized queries, preventing SQL injection vulnerabilities in administrative operations and improving the overall security posture of ProxySQL's REST interface.

Documentation & Testing

Comprehensive ProxySQL_Poll Usage Documentation (9c3f6b0, #5286)
Adds extensive documentation throughout the ProxySQL codebase explaining the core I/O multiplexing system. This comprehensive documentation helps developers understand how ProxySQL_Poll is used and integrated throughout the codebase, improving maintainability and reducing the learning curve for new contributors.

TAP Testing Documentation Enhancements (2d11405, #5269)
Updates the TAP (Test Anything Protocol) documentation with detailed unit test instructions and examples. The restructured guide includes best practices for writing TAP tests, examples of unit tests under test/tap/tests, and improved documentation for test groups, making it easier for developers to contribute to ProxySQL's test suite.

Documentation

Security & Feature Documentation

Comprehensive SSL/TLS Key Logging Documentation (4f675ed, #5279)
Adds detailed documentation for the ssl_keylog_file feature, which enables TLS key logging for debugging encrypted traffic. The documentation explains how to configure the feature, use it for debugging SSL/TLS issues, and provides guidance on secure file handling and access control for key log files.

PostgreSQL Support Documentation Updates (a83bba1, #5271)
Updates README.md and installation documentation to reflect PostgreSQL support alongside MySQL (and forks). The changes include proper version references, updated repository URLs, and enhanced information about ProxySQL's dual-database support capabilities.

Installation Documentation Updates (96af0fd, #5264)
Comprehensive updates to README.md and INSTALL.md to reflect ProxySQL 3.0.5 release, with proper version references throughout documentation and updated repository URLs from legacy proxysql-2.4.x branches.

Testing

Test Infrastructure Improvements

Enhanced Test Coverage and Organization (7e9e009, #5293)
Adds comprehensive test coverage improvements and better organizes test structure for improved validation of ProxySQL's functionality.

Security Testing

SSL Enforcement Testing (ba53c75, #5285)
Adds comprehensive regression tests for SSL enforcement functionality, ensuring that the PostgreSQL use_ssl configuration is properly validated and enforced across different connection scenarios.

Build/Packaging

Package Management Improvements

RPM Spec File Rework (0687365, #5235)
Reworks RPM specification files to use proper RPM macros for handling systemd integration. This addresses systemd-related issues during package installation in container environments where systemd commands and units are unavailable, improving the reliability of ProxySQL packages in Docker and other containerized deployments.

Deprecation Cleanup (8b2b299, #5291)
Removes deprecated code implementations that were scheduled for cleanup, improving code maintainability.

Other Changes

Version Management

Development Cycle Version Bump (8b66256, #5265)
Sets CURVER=3.0.5 in the Makefile at the beginning of the development cycle to properly track version progression and enable release automation processes for the 3.0.5 release branch.

The release commit is: 7e9e00997d7d9fa4811c86c3a3bec9c886386e1f

Full Changelog: 3.0.4...v3.0.5

Hashes

SHA256s:

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v3.0.4

ProxySQL 3.0.4 Release Notes

This release of ProxySQL 3.0.4 brings significant enhancements to PostgreSQL compatibility, MySQL protocol robustness, monitoring accuracy, and security hardening. With improved SSL/TLS support for PostgreSQL backends, better handling of edge-case MySQL protocol packets, and numerous performance optimizations, this release strengthens ProxySQL's position as a reliable database proxy for both MySQL and PostgreSQL ecosystems.

Release commit: faa64a570d19fe35af43494db0babdee3e3cdc89

Highlights

This release focuses on several key areas:

• Enhanced PostgreSQL Support: A PostgreSQL-specific tokenizer improves query digest generation, while SSL/TLS support for backend connections strengthens security in PostgreSQL monitoring.
• MySQL Protocol Robustness: Special handling for unexpected COM_PING packets prevents connection issues, and direct response to SELECT @@version queries reduces backend load.
• Monitoring Improvements: Fixes for artificially high ping latency provide more accurate health checks, and TCP keepalive warnings help identify potential connection stability issues.
• Security Hardening: A critical SQL injection vulnerability in configuration parsing has been fixed using prepared statements with bound parameters.
• Performance Optimizations: Lock-free hot paths for prepared statement cache operations reduce contention in high-concurrency environments.

New Features

PostgreSQL Improvements

ProxySQL's PostgreSQL support sees two major enhancements in this release:

PostgreSQL-Specific Tokenizer for Query Digest Generation (285fb1b, #5254)
The new tokenizer adds comprehensive PostgreSQL dialect support, including dollar-quoted strings ($$...$$), double-quoted identifiers, type cast syntax (value::type), array literals (ARRAY[...] and {...}), and prefixed literals (E'', U&'', x'', b''). This improves query fingerprinting accuracy for PostgreSQL workloads, ensuring similar queries are properly grouped together for caching and analysis. The tokenizer also handles nested comments and PostgreSQL-specific comment rules, providing more reliable query parsing.

SSL Support for Backend Connections in PostgreSQL Monitor (7205f42, #5237)
The PostgreSQL monitor now supports client certificates for SSL/TLS connections to backend servers, enhancing security for monitored connections. New metrics PgSQL_Monitor_ssl_connections_OK and PgSQL_Monitor_non_ssl_connections_OK provide visibility into connection status, helping administrators verify SSL/TLS configuration and troubleshoot connection issues.

MySQL Protocol Enhancements

Several improvements make ProxySQL more robust when handling MySQL protocol edge cases:

Special Handling for Unexpected COM_PING Packets (d0e8859, #5257)
Some MySQL clients occasionally send COM_PING packets during query processing, which previously caused connection issues. ProxySQL now queues these unexpected COM_PING packets as counters and sends corresponding OK packets after query completion, maintaining connection stability without interrupting normal query flow. Enhanced logging includes client address, session status, and data stream status for better debugging.

Handling of SELECT @@version and SELECT VERSION() Without Backend (df287b2, #4889)
To reduce unnecessary backend load, ProxySQL now responds directly to SELECT @@version and SELECT VERSION() queries without establishing backend connections. It returns a hardcoded server version (currently 8.0.0), which is sufficient for most client compatibility checks while conserving backend resources.

Client-Side wait_timeout Support (abe16e6, #4901)
Previously, ProxySQL ignored client-specified wait_timeout values, using only the global mysql-wait_timeout setting. Now, ProxySQL respects client timeout requests, terminating client connections (but not backend connections) when the client timeout is reached. As a safety measure, client timeouts are clamped to not exceed the global mysql-wait_timeout value.

Fast Forward Grace Close Feature to Prevent Data Loss (44aa606, #5203)
For fast-forward replication sessions, ProxySQL now implements graceful connection closure that ensures all pending data is flushed to the client before closing the connection. This prevents data loss during connection termination in replication scenarios, improving data consistency and reliability.

Monitoring & Diagnostics

Improved visibility into connection health and configuration issues:

TCP Keepalive Warnings When Disabled (cf454b8, #5228)
When TCP keepalive is disabled on connections, ProxySQL now emits warning messages to help administrators identify potential connection stability issues. These warnings include detailed connection information for troubleshooting, making it easier to detect misconfigured environments that might experience unexpected connection drops.

Bug Fixes

This release addresses several critical issues affecting thread safety, caching behavior, monitoring accuracy, and security:

MySQL

Make cur_cmd_cmnt Thread-Safe (91e2064, #5259)
The cur_cmd_cmnt (current command comment) variable was shared across threads, creating potential race conditions in multi-threaded environments. This fix ensures thread-safe access, preventing inconsistent behavior when multiple threads process queries simultaneously.

Fix cache_empty_result=0 Not Caching Non-Empty Resultsets (2987242, #5250)
The cache_empty_result field in query rules had incorrect behavior when set to "0". Previously, it prevented caching of any resultsets regardless of row count. Now, it correctly caches non-empty resultsets while skipping empty resultsets, aligning with the documented behavior and improving cache efficiency.

Incorrect Affected Rows Reporting for DDL Queries (05960b5, #5232)
Issue #4855 identified that mysql_affected_rows() in the ProxySQL Admin interface incorrectly reported affected rows for DDL queries, showing the previous DML's count instead of 0. DDL queries now correctly return 0 affected rows, providing accurate metadata to administrative tools and scripts.

Monitoring

Fix Artificially High Ping Latency in MySQL Backend Monitoring (24e02e9, #5199)
The MySQL backend monitor was reporting artificially high ping latency due to inefficient task dispatching. This fix introduces batching (batches of 30) with poll() calls between batches and reduces the monitor ping poll() timeout from 100ms to 10ms. These changes provide more responsive monitoring with accurate latency measurements.

Security & Configuration

Fix SQL Injection Vulnerability in Read_Global_Variables_from_configfile() (0b2bc1b, #5247)
A critical security vulnerability in configuration parsing has been addressed by replacing sprintf-based SQL query construction with prepared statements using bound parameters. The fix also handles automatic prefix stripping for mysql_variables, pgsql_variables, and admin_variables config parsing, preventing SQL injection attacks when users mistakenly include module prefixes (e.g., "mysql-") in variable names.

Improvements

Performance and stability enhancements across replication, prepared statements, and GTID handling:

Performance Optimizations

Improve Fast Forward Replication CLIENT_DEPRECATE_EOF Validation (5485bb0, #5240)
Enhanced validation logic for fast forward replication with the CLIENT_DEPRECATE_EOF capability flag ensures proper handling of replication packets and improves compatibility with MySQL 8.0+ clients. This prevents protocol mismatches and connection issues in replication scenarios.

Refactored Prepared-Statement Cache Design (Lock-Free Hot Path) (c0f99c0, #5225)
Significant performance improvements for high-concurrency workloads through a lock-free hot path for prepared statement cache operations. The redesign reduces contention by optimizing transaction command parsing to avoid unnecessary tokenization and replacing std::string with char[] to eliminate heap allocation in hot paths.

GTID: Refactor Reconnect Logic & Prevent events_count Reset (50c6028, #5226)
Refactored GTID reconnect logic prevents events_count from being reset during reconnection attempts, preserving replication state and reducing unnecessary replication restarts. This improves replication stability and reduces overhead during network interruptions.

Documentation

Extended documentation improves code maintainability and provides better guidance for developers and administrators:

Comprehensive Documentation Additions (cf8cbfd, #5258)
Extended documentation includes query rules capture groups and backreferences, "Closing killed client connection" warnings, coredump_filters feature addressing issue #5213, and vacuum_stats() with stats_pgsql_stat_activity Doxygen documentation including bug fixes.

Permanent Fast-Forward Sessions and check_data_flow() Documentation (ec1247f, #5245)
Documents behavior of permanent fast-forward sessions and the MySQL_Data_Stream::check_data_flow() method, explaining when bidirectional data checks are skipped for specific session types.

Claude Code Agent Definitions and Architecture Documentation (291e5f0, #5115)
Adds architecture documentation for Claude Code agent integration, including automation framework and internal documentation for AI-assisted development workflows.

Comprehensive Doxygen Documentation for GTID Refactoring (9a55e97, #5229)
Detailed Doxygen documentation for GTID-related code changes, improving code maintainability and developer onboarding.

TAP Test Writing Guide and GitHub Automation Improvements (4989960, #5215)
Provides a comprehensive guide for writing TAP tests for ProxySQL and improves GitHub automation workflows for continuous integration.

Testing

Enhanced test coverage and infrastructure improvements ensure reliability:

*...

v3.0.3

ProxySQL 3.0.3 Release Notes

This release of ProxySQL 3.0.3 includes a significant number of new features, particularly around PostgreSQL Extended Query Protocol support, along with numerous bug fixes and dependency updates to improve stability and performance.

Compared to version 3.0.2, ProxySQL 3.0.3 introduces the following changes:

New Features:

PostgreSQL Extended Query Protocol Support:

• Add PostgreSQL extended query (prepared statement) support (24fecc1, #5044)
  • Lays groundwork for handling PostgreSQL extended query protocol, including parsing, caching, and execution framework stubs.
• Added Describe message handling (a741598, #5044)
• Added Close statement handling (4d0618c, #5044)
• Added Bind and Execute support (8bb248c, #5044)
• Added support for protocol-supplied (out-of-band) parameter typing (4ebff4c, #5044)
  • Parameter types will be part of hash calculation. Includes refactoring and optimizations.
• Added support for protocol level parameter type (87ce0d0, #5044)
• Added pgsql-max_stmts_per_connection variable (3619fa5, #5044)
• Added SET statement tracking support (02eb58d, #5044)
• Added DEALLOCATE <stmt_name> and DEALLOCATE ALL support (070d4ca, #5044)
• Added prepared statement map and connection status fields to PROXYSQL INTERNAL SESSION output (f715c54, #5044)
• Added stats_pgsql_prepared_statements_info table (703a5f3, #5044)
• Add support for unnamed Describe Portal and improve extended query handling (48ba491, #5044)
  • Always send Describe Portal to the backend.
  • Enforce check for unnamed portals in Bind, Describe, Close, and Execute; raise errors for named portals.
  • Improve error handling for extended query flow.
  • Introduce Extended_Query_Info struct to unify extended query related members.
• Queue client packets during active query execution (3dd401f, #5078)
  • New packets are placed in a FIFO queue and processed after the current query finishes, improving compatibility with connectors like pgJDBC.

Build System & Dependencies:

• Upgrade coredumper to Percona fork hash 8f2623b (a315f12, #5171)
• Upgrade curl to v8.16.0 (40414de, #5154)
• Update clickhouse-cpp to v2.6.0 (a0f2a9b, #5154)
• Upgrade sqlite3 to v3.50.4 (6f29a4d, #5154)
• Upgrade libmicrohttpd to v1.0.2 (efa90b5, #5154)
• Add support for new build environments:
  • Fedora 42 (96be609, #5138)
  • Debian 13 (824cd86, #5141)
  • OpenSUSE 16 (8693655, #5141)
  • AlmaLinux 10 (ecce5c5, 3915847, e3a69b0, #5139)
  • CentOS 10 (1fba58e, 894afc5, d7d7833, #5139)
• Reduce duplication in makefiles, use include for common stuff (d020f57, #5158)

Other Features:

• Add Watchdog PROXYSQLTEST covering MySQL and PgSQL threads (344ba25, #5044)
• Refactored Watchdog and integrated PostgreSQL thread monitoring into it's loop (e4c0f5c, #5044)
• Added query logging support for PostgreSQL (a89291c, #5124)
• Handle SHOW STATUS LIKE 'Ssl_version' in ProxySQL without any backend (aa80a1f, #5085)
• Replace CLOCK_MONOTONIC with CLOCK_MONOTONIC_RAW (daf1570, #5099)
• Added integer_datetimes in ProxySQL startup parameters status, hardcoded to on. (43e5b55, #5103)
• Added scram_iterations in ProxySQL startup parameters status, hardcoded to 4096 SCRAM_SHA_256_DEFAULT_ITERATIONS (43e5b55, #5103)
• Added client_close_all (099597d, #5044)
• Implement a ignore_min_gtid_annotation global variable for ProxySQL (6cb5222, #5150)
• New admin command to dynamically change configuration file path.
  • Adds PROXYSQL SET CONFIG FILE command (7194437, #5113)
• Added KILL PGSQL CONNECTION support (b3e96b0, #5137)
• Add pgsql-kill_backend_connection_when_disconnect support (d09fe4d, #5137)
• Implement backend query cancellation for PostgreSQL (4d91452, #5136, #5137)
  • Adds support for PostgreSQL query cancellation and backend termination features.
  • Intercepts pg_backend_pid(), pg_terminate_backend(), pg_cancel_backend().
  • Supports Cancel Request protocol via separate connection with PID and secret key validation.
  • Returns BackendKeyData message on successful authentication.
• Add support for PostgreSQL transaction command aliases and ROLLBACK AND CHAIN (4527157, #5153)
• Add tracking for PostgreSQL search_path parameter (b005c2d, #5149)
• Added SHOW FULL PGSQL ACTIVITY and SHOW PGSQL ACTIVITY handling (fc4d7f7, #5156)
• Add backend PID/state to stats_pgsql_processlist and create pg_stat_activity-style view (f3ea179, #5156)

Bug Fixes:

Memory & Stability:

• Fix heap-after-use between PROXYSQL INTERNAL SESSION and SHOW PROCESSLIST (4b28bb6, #5191)
• Fix potential use-after-free by SHOW PROCESSLIST in MySQL (639f9d0, #5180)
• Fix potential use-after-free by SHOW PROCESSLIST in PgSQL (c0978f9, #5182)
• processlist: Prevent crash due to SQLITE_TOOBIG (5219d4b, #5165)
• Ensure PgSQL_Errors_statsvdestructor is invoked on delete (ff50bb4, #5112, #5078)
  • Fixes a bug where deleting PgSQL_Errors_stats instances with only a forward declaration caused the destructor to be skipped, leading to memory leaks.
• Fix: REST API server crash due to malformed multipart POST request (0a0336e, #5072, #5074)
  • Disables POST preprocessing option in libhttpserver and validates Content-Type header for POST /sync.
• Ensure PgSQL_Threads_Handler and PgSQL_HostGroups_Manager objects are released when ProxySQL shuts down or restarts (8d8577b, #5086, #5087, c7ce5a8, #5078)
  • Fixes client hangs after executing PROXYSQL RESTART and attempting reconnection.
• Fixed a crash occurring during session destruction (9e4b76d, #5044)
• Fixed PgSQL_Session::handler___status_NONE_or_default (8021121, #5044)
• Fixed Debug logs (3a46324, #5137)
• Fixed SSL STATUS in PgSQL_Data_Stream (58eac30, #5044)
• Fixed RequestEnd (97b3bb1 #5044))
• Fix RequestEnd: avoid updating internal state when query failed on backend (abd1911, #5078)
  • Adds success/failure flag to RequestEnd calls and restricts state changing logic to successful query executions.
• Fixed clang compilation (a7df0d3, #5120)
• Fixed compiler issues by updating postgresql (318f108, #5138)
• Fixed new compiler issue in mariadb-client (f1526fc, #5138)
• Fixed issues by updating libconfig (88c34b3, #5138)
• Fix new compiler issue in btree.h (5e7ab93, #5138)
• Fix compilation warning for strncpy due string truncation (2668de7, #5182, 67624b8, #5180)
• Add boundary checks in MySQL_Protocol::get_binds_from_pkt (e35973b, #5188)
• Change COM_STMT_EXECUTE params length decoding (64b1617, #5188)
• Ensure default mysql-interfaces=0.0.0.0:6033 and pgsql-interfaces=0.0.0.0:6133 are set (48928ce #5190)

PostgreSQL Specific:

• Fixed extended query message parser (944b0ef, #5142)
• Fix parameter length misalignment in PQsendQueryPrepared (786fb37, #5142)
• Send NoData in response to Describe Portal before Execute (empty query) (67842ff, #5143)
• Fixed Describe Portal returning NoData (1b47a1d, #5078)
• Align DateStyle parsing with PostgreSQL (d4b2de9, #5144)
• Fix ParameterStatus capitalization for DateStyle, TimeZone, and IntervalStyle (03b63f6, #5146)
• Fixed multiplex disabled due to CREATE SEQUENCE (c613865, #5078)
• If the startup connection includes untracked session parameters (passed via options=), the connection must be destroyed instead of returned to the pool (a69a443, #5078)
• Inject implicit Sync if simple query arrives before extended query cycle is completed (9a5fa14, #5078)
  • Injects an implicit Sync, processes extended query messages, then executes the simple query, and sends ReadyForQuery only after the simple query completes.
• Fix omission of ReadyForQuery after error with pending extended-query messages (fff2a91, #5078)
  • Ensures ReadyForQuery is always emitted immediately when a result indicates an error, preventing clients from waiting indefinitely.
• Ensure consistent handling of NoData packets in PQsendQueryPrepared (8a3bab5, #5078)
  • Explicitly appends a NoData packet to the result for commands like INSERT, DELETE, or UPDATE to provide consistent behavior.
• Fixed DISCARD ALL tag (4d3dc7b, #5044)
• Handled DISCARD ALL, DISCARD PLANS, send rest of the variants to backend Fixed connection reset for client connection (27f1fed, #5044)
• Prevent overwrite of named statements (7c71fe1, #5044)
  • Named prepared statements cannot be overwritten and will raise an error if redefined.
• Refined Bind Message parameter format, value handling, and result format iterator (b989fc2, #5044)
• Fixed SonarQube warnings where applicable (0638375, #5044)
• Corrected advancement of current pointer (ef2b0cb, #5044)
• Fixed few compilation warnings (3cff4f9, #5044)
• Removed server_capabilities from PgSQL modules (bc87d0d, #5044)
• Removed autocommit_on_hostgroup from PgSQL modules (87ad15b, #5044)
• Removed AutoCommit related code from PostgreSQL session (3cff4f9, #5044)
• Removed last_insert_id from PgSQL modules (026f458, #5044)
• Removed warning tracking code from PgSQL_Connection (2a9f672, #5044)
• Preserve implicit transactions with pipeline + FLUSH (23a764e, #5118, #5119)
  • Switches to libpq pipeline mode and replaces intermediate SYNC messages with FLUSH, ensuring all client query frames execute as part of the same implicit transaction
• Intercept LISTEN command and return "not supported" for both simple and extended query flows (0391a8d, #5109, #5078)

Admin & Configuration:

• Fixed PROXYSQL STOP (38befb8, #5173)
• Resolved issues with admin PROXYSQL PAUSE/RESUME commands (67d383d, #5173)
• Add validation for LOAD <module> FROM CONFIG (0a336de, #5113)
  • Adds validation for mysql_users, pgsql_users, `mysql_serv...

v3.0.2

ProxySQL v3.0.2 Release Notes

This is a minor release for ProxySQL 3.0 series containing some enhancements and several bug fixes. In this
version, as in the previous, the MySQL module is considered stable, building upon years of production use
and refinement. The PostgreSQL module is still in beta, and users should be aware that it is still
undergoing active development and testing.

Compared to version 3.0.1, ProxySQL 3.0.2 introduces the following changes:

Minor Features/Enhancements

PostgreSQL

• Improved error processing and report format for backend connections ('libpq') #4947

MySQL

• Add Group Replication support for MySQL 8.4 and 9.x #4983

Fixes

PostgreSQL

• Fixed backend connection reset and parameter handling for RESET/SET TO DEFAULT #5060
• Fixed crash when mirroring is configured for PostgreSQL #5051
• Fixed small leak in during Admin startup (flush_pgsql_variables___database_to_runtime) #5037
• Fixed table definition for pgsql_replication_hostgroups #5043
  • Range for check_type now reflects only supported checks (read_only).

MySQL

• Fixed memory leak in stats_mysql_global #5006
• Fixed potential overflow in SQLite3_memory_bytes field from stats_mysql_global #5006
• Fixed MySQL binary log for prepared statements with 0 parameters #5007

Common

• Fixed leak in Query Processor during query rules deletion #5037

Hashes

SHA256s:

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v3.0.1

ProxySQL v3.0.1 Release Notes

This release of ProxySQL v3.0.1 marks a significant step in our support for multiple database backends. In this version, the MySQL module is considered stable, building upon years of production use and refinement. The PostgreSQL module is still in beta, and while it includes substantial new features and improvements in this release, users should be aware that it is still undergoing active development and testing.

To make navigating these release notes easier, the changes are organized into three main sections:

• The PostgreSQL section details features, enhancements, and fixes specifically related to the PostgreSQL backend module.
• The MySQL section outlines changes specific to the MySQL backend module.
• The Common section covers improvements, features, and fixes that apply to both the MySQL and PostgreSQL modules, or are related to the core ProxySQL architecture and not tied to a specific database backend.

Major Features

PostgreSQL

In 3.0.0:

• Implemented support for PostgreSQL, enabling ProxySQL to act as a proxy for both MySQL and PostgreSQL databases. The default ports for PostgreSQL protocol are:
  • 6132 for admin portal
  • 6133 for PostgreSQL traffic
• Supported authentication methods:
  • Plain Text
  • MD5
  • SCRAM-SHA-256
• Introduced PostgreSQL-specific configuration options and tables.
• SSL connection support for both PostgreSQL frontend and backend connections.
• Multiplexing support for PostgreSQL.
• Enabled connection reuse from the connection pool.
• Added support for executing multiple statements within a single query.

In 3.0.1:

• Added parameter/variable tracking: This change significantly improves multiplexing capabilities allowing for a better connection reuse - #4799.
• Backend monitoring support, capable handling a larger number of backend servers with a small set of worker threads, supporting the following checks - #4726:
  • Connect: Availability check and assess connection latency.
  • Ping: Responsiveness check with automatic SHUNNING and latency tracking.
  • ReadOnly: Capable of server placement (via pgsql_replication_hostgroups) and automatic failover detection.
• Support for tracking variable state through transactions and savepoints (SAVEPOINT/ROLLBACK) - #4929.
• Improved support for connection-level parameters: All connection parameters supported by PostgreSQL are now supported by ProxySQL, since parameter validation is now delegated to the server itself - #4899.
• Added support for Notice and Warning messages. Resultsets containing these packets can be cached using the Query Cache - #4770.
• Added support for COPY … FROM STDIN (supported via FAST FORWARD) - #4762, #4874.

MySQL

• Added dual-password support: ProxySQL now allows the use of two passwords to facilitate password rotation, in the same fashion as MySQL. For more information see official doc.
• Added Enhanced Event and Query Logging , ported from 2.7.2
  • Introduced a powerful event logging and analysis feature with real-time insights into application behavior and database performance. It utilizes a circular buffer and SQLite databases (in-memory and on-disk) to optimize data retention and ensure high performance. This feature is configurable and ensures seamless operation without impacting real-time traffic.
  • Queries now can be logged in real time and available in stats_mysql_query_events and history_mysql_query_events.
  • MySQL Logger metrics are now exported through stats_mysql_global and Prometheus exporter.
  • More information can be found in the official documentation.
• Logging Parameters of Prepared Statements #4895 and #4922
  • ProxySQL now supports logging the parameters of prepared statements. This enhancement improves observability and debugging by including the actual values bound to parameter placeholders in the log output. The feature is currently available for MySQL queries only, and logging is written to event log files.
  • Logging of parameters is available in both binary and JSON formats
  • This feature is controlled by global variable mysql-eventslog_stmt_parameters , disabled by default
• New eventlog event PROXYSQL_METADATA #4922
  • When logging queries in eventlog in binary format, a new event is added when a new file is created. This event contains metadata (currently only ProxySQL version) that allows identifying the format version.
• DNS cache enhancement: Better distribution of DNS resolution attempts to reduce the likelihood of collisions and simultaneous expirations. This prevents sudden bursts that increase the resolution queue size - #4745.

Common

• Use system OpenSSL library: ProxySQL now doesn’t use a statically linked version of OpenSSL, instead the library is now dynamically linked. Additionally, warning messages have been added to the error log when problematic OpenSSL versions are detected - #4740.
• To improve the performance of the Admin module, it avoids unnecessary VACUUM operations on stats database: This enhancement ensures that VACUUM operations are only performed when a meaningful amount of memory is going to be free. It is also combined with other optimizations making the Admin interface more responsive and less CPU intensive when querying these tables - #4859.

Minor Features/Enhancements

MySQL

• Add support for specifying MySQL compression level - #4764.
• Variable session_track_system_variables is now a ignored for tracking - #4852.
• Added support for parsing @@session and @@global on SET statements for variable tracking- #4852.
• It is now possible to read mysql_hostgroup_attributes from config file - #4704.
• Add support for SHOW REPLICA STATUS in MySQL versions bigger than 8.0.23 - #4908.

Common

• Make threads name optional: Introduced variable set_thread_name available through the config file to enable/disable the feature - #4810.
• Removed support for distros that are either obsolete or do not support OpenSSL 3 - #4749.
  • Centos 8
  • Debian 10
  • Debian 11
  • Fedora 38
  • Fedora 39
  • Ubuntu 18
  • Ubuntu 20
• Improved error handling when database file isn’t writable: ProxySQL now exits gracefully in case of permissions issues with the database file, avoiding a crashing loop - #4903.
• [For Debug release only] Improved the performance of debug logging to disk: Entries are now batched into a log buffer, reducing the number of disk operations. Buffer size isn’t configurable, but a sync can be forced via PROXYSQL FLUSH LOGS command - #4818.

Fixes

MySQL

• Fix setting invalid collation when collation_id is larger than 255: When collation_ids are bigger than 255 they can’t be set in the handshake, in this case ProxySQL will issue a SET NAMES … COLLATE to prepare the backend connection - #4842
• Fix memory leak on SSL caches on auxiliary threads. This leak would affect short lived threads, like for example when ProxySQL requires to kill backend connections (kill_query_thread) - #4801.
• Fix memory leak on monitoring connections when servers have specific SSL configuration, via mysql_servers_ssl_params - #4809.
• Fix clients failing to verify SSL certificates when certificate chains hold more than one intermediate certificate. ProxySQL now ensures the exchange of the correct number of certificates to ensure pair verification - #4904.
• Fix crash on malformed packet (with invalid column-count) received from MySQL - #4743.
• Fix query digests for certain commends on queries of certain sizes - #4932.
• Improve CLIENT_DEPRECATE_EOF capability match for fast-forward connections - #4819 .
• Fixed issue with mysql cli STATUS command , where username and schemaname were swapped - #4914.

Common

• Fix slow query response time due to overflow in threshold_resulset_size - #4744.
• Fix halt on PROXYSQL RESUME command: Resume logic was timing sensitive and could result in a halt and a crash (watchdog), the new simplified logic ensures this scenario doesn’t take place - #4758.
• Fix swap between `mirr...

v2.7.3

ProxySQL 2.7.3 Release Notes

Release date: 2025-03-10

This is a minor release for ProxySQL 2.7 series containing some enhancements and several bug fixes.

Compared to version 2.7.2, ProxySQL 2.7.3 introduces the following changes:

New features and enhancements

Minor

• Added compatibility for PMM 'runtime_mysql_servers_*' metrics to native Prometheus exporter #4854
• Ignore tracking for session_track_system_variables (until properly supported, see #4839) #4853
• Added support for @@session and @global to SET statements parser #4853

Bug Fixes

Major

• Fixed frontend/backend collation mismatch when collation id larger than 255 #4850

Minor

• Fixed DELETE operations for stats_mysql_query_events on stats memory database #4822
• Fixed compatibility with PMM for new MySQL_Logger metrics #4822

Hashes

SHA256s:

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v2.7.2

ProxySQL 2.7.2 Release Notes

Release date: 2025-01-27

This is a minor release for ProxySQL 2.7 series containing some enhancements and several bug fixes.

Compared to version 2.7.1, ProxySQL 2.7.2 introduces the following changes:

New features and enhancements

Major

• Added Enhanced Event and Query Logging: #4713 and #4802
  • ProxySQL 2.7.2 introduces a powerful event logging and analysis feature with real-time insights into application behavior and database performance. It utilizes a circular buffer and SQLite databases (in-memory and on-disk) to optimize data retention and ensure high performance. This feature is configurable and ensures seamless operation without impacting real-time traffic.
  • Queries now can be logged in real time and available in stats_mysql_query_events and history_mysql_query_events.
  • MySQL Logger metrics are now exported through stats_mysql_global and Prometheus exporter.
  • More information can be found in the official documentation.

Minor

• Added MySQL variable (mysql-protocol_compression_level) to control protocol compression level #4789
• Table mysql_hostgroup_attributes is now configurable through the config file #4748
• Randomized cache TTL queueing and distribution reducing the need for helper threads #4729
• Added integrity checks on MySQL packets with malformed column-count (crash prevention) #4742

Bug Fixes

Major

• Fixed crash when empty query is received in Admin interface #4722
• Fixed halt on PROXYSQL RESUME command #4757
• Fixed leak of SSL caches for auxiliary threads #4801

Minor

• Fixed small memory leak when ssl_params are used on Monitor connections #4795
• Fixed query cache always storing empty resultsets, not honoring mysql-query_cache_stores_empty_result #4723
• Fixed potential overflows for mysql_thread___threshold_resultset_size #4733

Hashes

SHA256s:

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