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Consolidate VACUUM xid cutoff logic.

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Push the logic for determining whether or not a VACUUM operation will be
aggressive down into vacuum_set_xid_limits().  This makes the function's
signature significantly simpler, and seems clearer overall.

Author: Peter Geoghegan <pg@bowt.ie>
Discussion: https://postgr.es/m/CAH2-WzkymFbz6D_vL+jmqSn_5q1wsFvFrE+37yLgL_Rkfd6Gzg@mail.gmail.com
This commit is contained in:
Peter Geoghegan
2022-02-11 18:26:15 -08:00
parent 872770fd6c
commit efa4a9462a
4 changed files with 79 additions and 95 deletions
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34
src/backend/access/heap/vacuumlazy.c
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@ -323,8 +323,6 @@ heap_vacuum_rel(Relation rel, VacuumParams *params,
minmulti_updated;
BlockNumber orig_rel_pages;
char **indnames = NULL;
TransactionId xidFullScanLimit;
MultiXactId mxactFullScanLimit;
BlockNumber new_rel_pages;
BlockNumber new_rel_allvisible;
double new_live_tuples;
@ -352,24 +350,24 @@ heap_vacuum_rel(Relation rel, VacuumParams *params,
pgstat_progress_start_command(PROGRESS_COMMAND_VACUUM,
RelationGetRelid(rel));
vacuum_set_xid_limits(rel,
params->freeze_min_age,
params->freeze_table_age,
params->multixact_freeze_min_age,
params->multixact_freeze_table_age,
&OldestXmin, &FreezeLimit, &xidFullScanLimit,
&MultiXactCutoff, &mxactFullScanLimit);
/*
* We request an aggressive scan if the table's frozen Xid is now older
* than or equal to the requested Xid full-table scan limit; or if the
* table's minimum MultiXactId is older than or equal to the requested
* mxid full-table scan limit; or if DISABLE_PAGE_SKIPPING was specified.
* Get OldestXmin cutoff, which is used to determine which deleted tuples
* are considered DEAD, not just RECENTLY_DEAD. Also get related cutoffs
* used to determine which XIDs/MultiXactIds will be frozen.
*
* If this is an aggressive VACUUM, then we're strictly required to freeze
* any and all XIDs from before FreezeLimit, so that we will be able to
* safely advance relfrozenxid up to FreezeLimit below (we must be able to
* advance relminmxid up to MultiXactCutoff, too).
*/
aggressive = TransactionIdPrecedesOrEquals(rel->rd_rel->relfrozenxid,
xidFullScanLimit);
aggressive |= MultiXactIdPrecedesOrEquals(rel->rd_rel->relminmxid,
mxactFullScanLimit);
aggressive = vacuum_set_xid_limits(rel,
params->freeze_min_age,
params->freeze_table_age,
params->multixact_freeze_min_age,
params->multixact_freeze_table_age,
&OldestXmin, &FreezeLimit,
&MultiXactCutoff);
skipwithvm = true;
if (params->options & VACOPT_DISABLE_PAGE_SKIPPING)
{