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Rearrange pg_subtrans handling as per recent discussion. pg_subtrans

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updates are no longer WAL-logged nor even fsync'd; we do not need to,
since after a crash no old pg_subtrans data is needed again.  We truncate
pg_subtrans to RecentGlobalXmin at each checkpoint.  slru.c's API is
refactored a little bit to separate out the necessary decisions.
This commit is contained in:
Tom Lane
2004-08-23 23:22:45 +00:00
parent 059912ce2e
commit 4dbb880d3c
13 changed files with 387 additions and 436 deletions
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5
src/backend/commands/vacuum.c
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@@ -13,7 +13,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.286 2004/08/06 04:15:07 momjian Exp $
* $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.287 2004/08/23 23:22:45 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -810,9 +810,8 @@ vac_truncate_clog(TransactionId vacuumXID, TransactionId frozenXID)
return;
}
/* Truncate CLOG and SUBTRANS to the oldest vacuumxid */
/* Truncate CLOG to the oldest vacuumxid */
TruncateCLOG(vacuumXID);
TruncateSUBTRANS(vacuumXID);
/* Give warning about impending wraparound problems */
if (frozenAlreadyWrapped)