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Add vacuum_freeze_table_age GUC option, to control when VACUUM should

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ignore the visibility map and scan the whole table, to advance
relfrozenxid.
This commit is contained in:
Heikki Linnakangas
2009-01-16 13:27:24 +00:00
parent 19afb4e805
commit 6587818542
16 changed files with 170 additions and 54 deletions
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43
src/backend/commands/vacuum.c
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@@ -13,7 +13,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.384 2009/01/01 17:23:40 momjian Exp $
* $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.385 2009/01/16 13:27:23 heikki Exp $
*
*-------------------------------------------------------------------------
*/
@@ -62,6 +62,7 @@
* GUC parameters
*/
int vacuum_freeze_min_age;
int vacuum_freeze_table_age;
/*
* VacPage structures keep track of each page on which we find useful
@@ -590,9 +591,12 @@ get_rel_oids(Oid relid, const RangeVar *vacrel, const char *stmttype)
* vacuum_set_xid_limits() -- compute oldest-Xmin and freeze cutoff points
*/
void
vacuum_set_xid_limits(int freeze_min_age, bool sharedRel,
vacuum_set_xid_limits(int freeze_min_age,
int freeze_table_age,
bool sharedRel,
TransactionId *oldestXmin,
TransactionId *freezeLimit)
TransactionId *freezeLimit,
TransactionId *freezeTableLimit)
{
int freezemin;
TransactionId limit;
@@ -648,6 +652,34 @@ vacuum_set_xid_limits(int freeze_min_age, bool sharedRel,
}
*freezeLimit = limit;
if (freezeTableLimit != NULL)
{
int freezetable;
/*
* Determine the table freeze age to use: as specified by the caller,
* or vacuum_freeze_table_age, but in any case not more than
* autovacuum_freeze_max_age * 0.95, so that if you have e.g nightly
* VACUUM schedule, the nightly VACUUM gets a chance to freeze tuples
* before anti-wraparound autovacuum is launched.
*/
freezetable = freeze_min_age;
if (freezetable < 0)
freezetable = vacuum_freeze_table_age;
freezetable = Min(freezetable, autovacuum_freeze_max_age * 0.95);
Assert(freezetable >= 0);
/*
* Compute the cutoff XID, being careful not to generate a
* "permanent" XID.
*/
limit = ReadNewTransactionId() - freezetable;
if (!TransactionIdIsNormal(limit))
limit = FirstNormalTransactionId;
*freezeTableLimit = limit;
}
}
@@ -1219,8 +1251,9 @@ full_vacuum_rel(Relation onerel, VacuumStmt *vacstmt)
i;
VRelStats *vacrelstats;
vacuum_set_xid_limits(vacstmt->freeze_min_age, onerel->rd_rel->relisshared,
&OldestXmin, &FreezeLimit);
vacuum_set_xid_limits(vacstmt->freeze_min_age, vacstmt->freeze_table_age,
onerel->rd_rel->relisshared,
&OldestXmin, &FreezeLimit, NULL);
/*
* Flush any previous async-commit transactions. This does not guarantee