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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2004-08-22 02:41:58 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2004-08-22 02:41:58 +0000 |
| commit | f009c316ba49857249611bc0d578c518c449879e (patch) | |
| tree | 4fbab4d7068969dced2e698735407b1ffca38075 /src/backend/storage/ipc/sinval.c | |
| parent | 37d937ea2c062093887e6aa03879166b6db06900 (diff) | |
| download | postgresql-f009c316ba49857249611bc0d578c518c449879e.tar.gz | |
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.
Diffstat (limited to 'src/backend/storage/ipc/sinval.c')
| -rw-r--r-- | src/backend/storage/ipc/sinval.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/src/backend/storage/ipc/sinval.c b/src/backend/storage/ipc/sinval.c index af046a3f1e..f28a883572 100644 --- a/src/backend/storage/ipc/sinval.c +++ b/src/backend/storage/ipc/sinval.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/storage/ipc/sinval.c,v 1.68 2004/08/15 17:03:36 tgl Exp $ + * $PostgreSQL: pgsql/src/backend/storage/ipc/sinval.c,v 1.69 2004/08/22 02:41:57 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -526,7 +526,7 @@ TransactionIdIsInProgress(TransactionId xid) /* * Don't bother checking a very old transaction. */ - if (TransactionIdPrecedes(xid, RecentGlobalXmin)) + if (TransactionIdPrecedes(xid, RecentXmin)) { xc_by_recent_xmin_inc(); return false; @@ -912,6 +912,7 @@ CountActiveBackends(void) return count; } +#ifdef NOT_USED /* * GetUndoRecPtr -- returns oldest PGPROC->logRec. */ @@ -947,6 +948,7 @@ GetUndoRecPtr(void) return (urec); } +#endif /* NOT_USED */ /* * BackendIdGetProc - given a BackendId, find its PGPROC structure |