From 48188e1621bb6711e7d092bee48523b18cd80177 Mon Sep 17 00:00:00 2001 From: Tom Lane Date: Sun, 5 Nov 2006 22:42:10 +0000 Subject: Fix recently-understood problems with handling of XID freezing, particularly 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relying on hint-bit updates to be preserved, pg_clog is not truncated until all instances of an XID are known to have been replaced by FrozenTransactionId.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. --- src/backend/utils/init/postinit.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) (limited to 'src/backend/utils/init/postinit.c') diff --git a/src/backend/utils/init/postinit.c b/src/backend/utils/init/postinit.c index 9ab8c9ba97f..82532a196b0 100644 --- a/src/backend/utils/init/postinit.c +++ b/src/backend/utils/init/postinit.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.171 2006/10/04 00:30:02 momjian Exp $ + * $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.172 2006/11/05 22:42:09 tgl Exp $ * * *------------------------------------------------------------------------- @@ -77,7 +77,7 @@ FindMyDatabase(const char *name, Oid *db_id, Oid *db_tablespace) char *filename; FILE *db_file; char thisname[NAMEDATALEN]; - TransactionId dummyxid; + TransactionId db_frozenxid; filename = database_getflatfilename(); db_file = AllocateFile(filename, "r"); @@ -87,8 +87,7 @@ FindMyDatabase(const char *name, Oid *db_id, Oid *db_tablespace) errmsg("could not open file \"%s\": %m", filename))); while (read_pg_database_line(db_file, thisname, db_id, - db_tablespace, &dummyxid, - &dummyxid)) + db_tablespace, &db_frozenxid)) { if (strcmp(thisname, name) == 0) { -- cgit v1.2.3