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Fix recently-understood problems with handling of XID freezing, particularly

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in PITR scenarios.  We now WAL-log the replacement of old XIDs with
FrozenTransactionId, so that such replacement is guaranteed to propagate to
PITR slave databases.  Also, rather than relying on hint-bit updates to be
preserved, pg_clog is not truncated until all instances of an XID are known to
have been replaced by FrozenTransactionId.  Add new GUC variables and
pg_autovacuum columns to allow management of the freezing policy, so that
users can trade off the size of pg_clog against the amount of freezing work
done.  Revise the already-existing code that forces autovacuum of tables
approaching the wraparound point to make it more bulletproof; also, revise the
autovacuum logic so that anti-wraparound vacuuming is done per-table rather
than per-database.  initdb forced because of changes in pg_class, pg_database,
and pg_autovacuum catalogs.  Heikki Linnakangas, Simon Riggs, and Tom Lane.
This commit is contained in:
Tom Lane
2006-11-05 22:42:10 +00:00
parent 10c70b8602
commit 48188e1621
43 changed files with 1284 additions and 1062 deletions
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6
src/backend/storage/ipc/procarray.c
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@ -23,7 +23,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/ipc/procarray.c,v 1.18 2006/10/04 00:29:57 momjian Exp $
* $PostgreSQL: pgsql/src/backend/storage/ipc/procarray.c,v 1.19 2006/11/05 22:42:09 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -213,7 +213,9 @@ TransactionIdIsInProgress(TransactionId xid)
/*
* Don't bother checking a transaction older than RecentXmin; it could not
* possibly still be running.
* possibly still be running. (Note: in particular, this guarantees
* that we reject InvalidTransactionId, FrozenTransactionId, etc as
* not running.)
*/
if (TransactionIdPrecedes(xid, RecentXmin))
{