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Set a default autovacuum vacuum_cost_delay value of 20ms, to avoid excessive

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I/O utilization, per discussion.

While at it, lower the autovacuum vacuum and analyze threshold values to 50
tuples.  It is a bit higher (i.e. more conservative) than what I originally
proposed but much better than the old values for small tables.
This commit is contained in:
Alvaro Herrera
2007-07-24 01:53:56 +00:00
parent ab7d2b6a73
commit 53d2951be7
3 changed files with 12 additions and 11 deletions
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8
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 1.405 2007/07/10 13:14:21 mha Exp $
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.406 2007/07/24 01:53:56 alvherre Exp $
*
*--------------------------------------------------------------------
*/
@ -1348,7 +1348,7 @@ static struct config_int ConfigureNamesInt[] =
GUC_UNIT_MS
},
&autovacuum_vac_cost_delay,
-1, -1, 1000, NULL, NULL
20, -1, 1000, NULL, NULL
},
{
@ -1656,7 +1656,7 @@ static struct config_int ConfigureNamesInt[] =
NULL
},
&autovacuum_vac_thresh,
500, 0, INT_MAX, NULL, NULL
50, 0, INT_MAX, NULL, NULL
},
{
{"autovacuum_analyze_threshold", PGC_SIGHUP, AUTOVACUUM,
@ -1664,7 +1664,7 @@ static struct config_int ConfigureNamesInt[] =
NULL
},
&autovacuum_anl_thresh,
250, 0, INT_MAX, NULL, NULL
50, 0, INT_MAX, NULL, NULL
},
{
/* see varsup.c for why this is PGC_POSTMASTER not PGC_SIGHUP */