4 Commits

Author	SHA1	Message	Date
Bruce Momjian	da9a8649d8	Update copyright to 2004.	2004-08-29 04:13:13 +00:00
Tom Lane	4dbb880d3c	Rearrange pg_subtrans handling as per recent discussion. pg_subtrans ... 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.	2004-08-23 23:22:45 +00:00
Tom Lane	f009c316ba	Tweak code so that pg_subtrans is never consulted for XIDs older than ... RecentXmin (== MyProc->xmin). This ensures that it will be safe to truncate pg_subtrans at RecentGlobalXmin, which should largely eliminate any fear of bloat. Along the way, eliminate SubTransXidsHaveCommonAncestor, which isn't really needed and could not give a trustworthy result anyway under the lookback restriction. In an unrelated but nearby change, #ifdef out GetUndoRecPtr, which has been dead code since 2001 and seems unlikely to ever be resurrected.	2004-08-22 02:41:58 +00:00
Tom Lane	573a71a5da	Nested transactions. There is still much left to do, especially on the ... performance front, but with feature freeze upon us I think it's time to drive a stake in the ground and say that this will be in 7.5. Alvaro Herrera, with some help from Tom Lane.	2004-07-01 00:52:04 +00:00