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It is not safe to assume that we can bulk-delete all entries from the log table based on their "id" being less than the largest "id" we have processed so far, as we may unintentionally delete some tuples from the log which we haven't actually processed yet in the case of concurrent transactions adding tuples into the log table.
pg_repack -- Reorganize tables in PostgreSQL databases with minimal locks ========================================================================= - Homepage: http://reorg.github.com/pg_repack - Download: http://pgxn.org/dist/pg_repack/ - Development: https://github.com/reorg/pg_repack - Bug Report: https://github.com/reorg/pg_repack/issues - Mailing List: http://pgfoundry.org/mailman/listinfo/reorg-general pg_repack_ is a PostgreSQL extension which lets you remove bloat from tables and indexes, and optionally restore the physical order of clustered indexes. Unlike CLUSTER_ and `VACUUM FULL`_ it works online, without holding an exclusive lock on the processed tables during processing. pg_repack is efficient to boot, with performance comparable to using CLUSTER directly. Please check the documentation (in the ``doc`` directory or online_) for installation and usage instructions. .. _pg_repack: http://reorg.github.com/pg_repack .. _CLUSTER: http://www.postgresql.org/docs/current/static/sql-cluster.html .. _VACUUM FULL: VACUUM_ .. _VACUUM: http://www.postgresql.org/docs/current/static/sql-vacuum.html .. _online: pg_repack_ What about pg_reorg? -------------------- pg_repack is a fork of the pg_reorg_ project, which has proven hugely successful. Unfortunately development appears to have stopped after the release of the version 1.1.7, around August 2011. pg_repack 1.1.8 was released as a drop-in replacement for pg_reorg, addressing some of the shortcomings of the last pg_reorg version (such as support for PostgreSQL 9.2 and EXTENSION packaging) and known bugs. Shortly after the first pg_repack release, pg_reorg 1.1.8 was released too, merging all the pg_repack changes. Version 1.1.8 is the last pg_reorg release at the time of writing. pg_repack 1.2 is a new development line based on the original pg_reorg codebase and offering new features. Its behaviour may be different from the 1.1.x release so it shouldn't be considered a drop-in replacement: you are advised to check the documentation__ before upgrading from previous versions. .. __: pg_repack_ .. _pg_reorg: http://reorg.projects.pgfoundry.org/