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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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13
src/backend/utils/misc/guc.c
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@@ -10,7 +10,7 @@
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.493 2009/01/12 05:10:44 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.494 2009/01/16 13:27:24 heikki Exp $
*
*--------------------------------------------------------------------
*/
@@ -1544,7 +1544,16 @@ static struct config_int ConfigureNamesInt[] =
NULL
},
&vacuum_freeze_min_age,
100000000, 0, 1000000000, NULL, NULL
50000000, 0, 1000000000, NULL, NULL
},
{
{"vacuum_freeze_table_age", PGC_USERSET, CLIENT_CONN_STATEMENT,
gettext_noop("Age at which VACUUM should scan whole table to freeze tuples."),
NULL
},
&vacuum_freeze_table_age,
150000000, 0, 2000000000, NULL, NULL
},
{

3
src/backend/utils/misc/postgresql.conf.sample
View File

@@ -413,7 +413,8 @@
#default_transaction_read_only = off
#session_replication_role = 'origin'
#statement_timeout = 0 # 0 is disabled
#vacuum_freeze_min_age = 100000000
#vacuum_freeze_min_age = 50000000
#vacuum_freeze_table_age = 150000000
#xmlbinary = 'base64'
#xmloption = 'content'