2018bd6167
ProcessSingleRelationFork() unconditionally generated an FPI WAL record for every page of every relation when enabling checksums. Unlogged relations, which by definition never generate WAL for data changes, were not exempt which generated excessive WAL to be emitted. Fix by guarding the FPI WAL record call with RelationNeedsWAL() to avoid emitting WAL for unlogged main forks. Unlogged pages are still dirtied to ensure the checksum is written to disk at the next checkpoint. The init fork remains WAL-logged even for unlogged relations, as it's needed on the standby to materialize the relation after promotion (see ResetUnloggedRelations()). Skipping init-fork WAL would leave the standby with a stale init fork that, once copied to the main fork on promotion, would fail checksum verification on every read of the unlogged relation. A test which creates an unlogged table with an index, enables checksums, promotes the standby, and verifies that the unlogged relation and its indexes are still readable post-promotion has been added. Author: Satyanarayana Narlapuram <satyanarlapuram@gmail.com> Reviewed-by: Daniel Gustafsson <daniel@yesql.se> Reviewed-by: Ayush Tiwari <ayushtiwari.slg01@gmail.com> Discussion: https://postgr.es/m/CAHg+QDeGrpZbNZdLjd_T4b43xKEEXZN0HGhkFm-1bkBdyzK7AQ@mail.gmail.com |
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PostgreSQL Database Management System
This directory contains the source code distribution of the PostgreSQL database management system.
PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.