File txn

File Extension: .txn (Disk-Backed Undo Journal)

Turkce Dokumantasyon | English Documentation

Category: File Formats & Storage
Location: dbstore/txn/${transaction_uuid}.txn
Format: Line-Delimited Journal Log

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1. Definition and Overview

The .txn file is an active, disk-backed undo journal created upon transact_start(). It records the exact pre-modification state of every modified or deleted record and tracks inserted IDs. If a transaction fails or a process crashes, transact_rollback() or transact_recover() parses the .txn file to reverse mutations in LIFO order.

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2. See Also

• Concept: Undo Journal Rollback
• Method: transact_start
• Method: transact_rollback
• Method: transact_recover