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Nathan Bossart 9879105024 vacuumdb: Don't skip empty relations in --missing-stats-only mode. 
Presently, --missing-stats-only skips relations with reltuples set
to 0 because empty relations don't get optimizer statistics.
However, before v14, a reltuples value of 0 was ambiguous: it could
either mean the relation is empty, or it could mean that it hadn't
yet been vacuumed or analyzed.  (Commit 3d351d916b taught v14 and
newer to use -1 for the latter case.)  This ambiguity can cause
--missing-stats-only to inadvertently skip relations that need
optimizer statistics after upgrades to v18 and newer (since
reltuples is now transferred from the old cluster).

To fix, simply remove the check for reltuples != 0.  This will
cause --missing-stats-only to analyze some empty tables, but that
doesn't seem too terrible a trade-off.

Reported-by: Christoph Berg <myon@debian.org>
Reviewed-by: Christoph Berg <myon@debian.org>
Discussion: https://postgr.es/m/aAjyvW5_fRGNr7yF%40msg.df7cb.de
2025-04-30 14:12:59 -05:00
.github Add CODE_OF_CONDUCT.md, CONTRIBUTING.md, and SECURITY.md. 2024-07-02 13:03:58 -05:00
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contrib oauth: Disallow OAuth connections via postgres_fdw/dblink 2025-04-29 13:08:24 -07:00
doc Further adjust guidance for running vacuumdb after pg_upgrade. 2025-04-30 14:12:59 -05:00
src vacuumdb: Don't skip empty relations in --missing-stats-only mode. 2025-04-30 14:12:59 -05:00
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README.md

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/.