c4b71e6f60
With 64-bit multixact offsets, PerformMembersTruncation() doesn't need the starting offset anymore. The 'oldestOffset' value that TruncateMultiXact() calculates is no longer used for anything. Remove it, and the code to calculate it. 'oldestOffset' was included in the WAL record as 'startTruncMemb', which sounds nice if you e.g. look at the WAL with pg_waldump, but it was also confusing because we didn't actually use the value for determining what to truncate. Replaying the WAL would remove all segments older than 'endTruncMemb', regardless of 'startTruncMemb'. The 'startTruncOff' stored in the WAL record was similarly unnecessary even before 64-bit multixid offsets, it was stored just for the sake of symmetry with 'startTruncMemb'. Remove both from the WAL record, and rename the remaining 'endTruncOff' to 'oldestMulti' and 'endTruncMemb' to 'oldestOffset', for consistency with the variable names used for them in other places. Reviewed-by: Andrey Borodin <x4mmm@yandex-team.ru> Discussion: https://www.postgresql.org/message-id/000301b2-5b81-4938-bdac-90f6eb660843@iki.fi
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/.