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= SkyTools - tools for PostgreSQL = This is a package of tools in use in Skype for replication and failover. Also it includes a generic queuing mechanism PgQ and utility library for Python scripts. == Overview == It contains following tools: === PgQ === This is the queue mechanism we use. It consists of PL/pgsql, and C code in database, with Python framework on top of it. It is based on snapshot based event handling ideas from Slony-I, written for general usage. Features: - There can be several queues in database. - There can be several producers than can insert into any queue. - There can be several consumers on one queue and all consumers see all events. Documentation: - PgQ admin tool (pgqadm) usage: doc/pgq-admin.txt - PgQ SQL API overview: doc/pgq-sql.txt - PgQ SQL reference: http://skytools.projects.postgresql.org/pgq/ === Londiste === Replication tool written in Python, using PgQ as event transport. Features: - Tables can be added one-by-one into set. - Initial COPY for one table does not block event replay for other tables. - Can compare tables on both sides. Documentation: - Londiste script usage: doc/londiste.cmdline.txt (also available as `man 1 londiste`) - Londiste configuration: doc/londiste.config.txt (also available as `man 5 londiste`) - Londiste reference: doc/londiste.ref.txt === walmgr === This script will setup WAL archiving, does initial backup and runtime WAL archive and restore. == Source tree contents == doc/ Documentation in asciidoc format. Source for both html and man pages. python/ Python modules and primary executables - walmgr, londiste, qadmin, pgqadm. python/pgq/ Python framework for PgQ. python/londiste/ Londiste replication. python/skytools/ Low-level utilities for writing database scripts in Python. sql/ Database modules. sql/pgq/ Table definitions and functions for PgQ queueing. sql/pgq_coop/ Functions for cooperative consuming. sql/londiste/ Table definitions and functions for Londiste replication. sql/ticker/ PgQ ticker written in C. scripts/ Python scripts with lesser priority. lib/ libusual C libary, for pgqd. debian/ Debian packaging. This is for creating private packages, official Debian packages uses it's own packagin code. misc/ Random scripts used for building.