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| author | Noah Misch <noah@leadboat.com> | 2024-04-29 10:24:56 -0700 |
|---|---|---|
| committer | Noah Misch <noah@leadboat.com> | 2024-04-29 10:25:00 -0700 |
| commit | 2ca19aa8165c6bec84c1d527fc5f3100c2161b1a (patch) | |
| tree | 3b87cbad052a06bfa7ae502cd4e1bb9b4dba60e6 /src/tutorial/basics.source | |
| parent | 617a23927249c78f23ef005aaa78b508570f4cc8 (diff) | |
Close race condition between datfrozen and relfrozen updates.
vac_update_datfrozenxid() did multiple loads of relfrozenxid and
relminmxid from buffer memory, and it assumed each would get the same
value. Not so if a concurrent vac_update_relstats() did an inplace
update. Commit 2d2e40e3befd8b9e0d2757554537345b15fa6ea2 fixed the same
kind of bug in vac_truncate_clog(). Today's bug could cause the
rel-level field and XIDs in the rel's rows to precede the db-level
field. A cluster having such values should VACUUM affected tables.
Back-patch to v12 (all supported versions).
Discussion: https://postgr.es/m/20240423003956.e7.nmisch@google.com
Diffstat (limited to 'src/tutorial/basics.source')
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