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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have been replaced by FrozenTransactionId.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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7
src/backend/utils/init/postinit.c
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@ -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)
{