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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have been replaced by FrozenTransactionId.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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59
src/backend/catalog/heap.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/catalog/heap.c,v 1.313 2006/10/04 00:29:50 momjian Exp $
* $PostgreSQL: pgsql/src/backend/catalog/heap.c,v 1.314 2006/11/05 22:42:08 tgl Exp $
*
*
* INTERFACE ROUTINES
@@ -595,8 +595,7 @@ InsertPgClassTuple(Relation pg_class_desc,
values[Anum_pg_class_relhaspkey - 1] = BoolGetDatum(rd_rel->relhaspkey);
values[Anum_pg_class_relhasrules - 1] = BoolGetDatum(rd_rel->relhasrules);
values[Anum_pg_class_relhassubclass - 1] = BoolGetDatum(rd_rel->relhassubclass);
values[Anum_pg_class_relminxid - 1] = TransactionIdGetDatum(rd_rel->relminxid);
values[Anum_pg_class_relvacuumxid - 1] = TransactionIdGetDatum(rd_rel->relvacuumxid);
values[Anum_pg_class_relfrozenxid - 1] = TransactionIdGetDatum(rd_rel->relfrozenxid);
/* start out with empty permissions */
nulls[Anum_pg_class_relacl - 1] = 'n';
if (reloptions != (Datum) 0)
@@ -644,35 +643,6 @@ AddNewRelationTuple(Relation pg_class_desc,
*/
new_rel_reltup = new_rel_desc->rd_rel;
/* Initialize relminxid and relvacuumxid */
if (relkind == RELKIND_RELATION ||
relkind == RELKIND_TOASTVALUE)
{
/*
* Only real tables have Xids stored in them; initialize our known
* value to the minimum Xid that could put tuples in the new table.
*/
if (!IsBootstrapProcessingMode())
{
new_rel_reltup->relminxid = RecentXmin;
new_rel_reltup->relvacuumxid = RecentXmin;
}
else
{
new_rel_reltup->relminxid = FirstNormalTransactionId;
new_rel_reltup->relvacuumxid = FirstNormalTransactionId;
}
}
else
{
/*
* Other relations will not have Xids in them, so set the initial
* value to InvalidTransactionId.
*/
new_rel_reltup->relminxid = InvalidTransactionId;
new_rel_reltup->relvacuumxid = InvalidTransactionId;
}
switch (relkind)
{
case RELKIND_RELATION:
@@ -694,6 +664,31 @@ AddNewRelationTuple(Relation pg_class_desc,
break;
}
/* Initialize relfrozenxid */
if (relkind == RELKIND_RELATION ||
relkind == RELKIND_TOASTVALUE)
{
/*
* Initialize to the minimum XID that could put tuples in the table.
* We know that no xacts older than RecentXmin are still running,
* so that will do.
*/
if (!IsBootstrapProcessingMode())
new_rel_reltup->relfrozenxid = RecentXmin;
else
new_rel_reltup->relfrozenxid = FirstNormalTransactionId;
}
else
{
/*
* Other relation types will not contain XIDs, so set relfrozenxid
* to InvalidTransactionId. (Note: a sequence does contain a tuple,
* but we force its xmin to be FrozenTransactionId always; see
* commands/sequence.c.)
*/
new_rel_reltup->relfrozenxid = InvalidTransactionId;
}
new_rel_reltup->relowner = relowner;
new_rel_reltup->reltype = new_type_oid;
new_rel_reltup->relkind = relkind;