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Reduce the maximum value of vacuum_cost_delay and autovacuum_vacuum_cost_delay

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to 100ms (from 1000).  This still seems to be comfortably larger than the
useful range of the parameter, and it should help discourage people from
picking uselessly large values.  Tweak the documentation to recommend small
values, too.  Per discussion of a couple weeks ago.
This commit is contained in:
Tom Lane
2009-02-28 00:10:52 +00:00
parent 07b9936a0f
commit 640796ff41
6 changed files with 61 additions and 53 deletions
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24
src/test/regress/sql/guc.sql
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@@ -3,14 +3,14 @@
SHOW datestyle;
-- SET to some nondefault value
SET vacuum_cost_delay TO 400;
SET vacuum_cost_delay TO 40;
SET datestyle = 'ISO, YMD';
SHOW vacuum_cost_delay;
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;
-- SET LOCAL has no effect outside of a transaction
SET LOCAL vacuum_cost_delay TO 500;
SET LOCAL vacuum_cost_delay TO 50;
SHOW vacuum_cost_delay;
SET LOCAL datestyle = 'SQL';
SHOW datestyle;
@@ -18,7 +18,7 @@ SELECT '2006-08-13 12:34:56'::timestamptz;
-- SET LOCAL within a transaction that commits
BEGIN;
SET LOCAL vacuum_cost_delay TO 500;
SET LOCAL vacuum_cost_delay TO 50;
SHOW vacuum_cost_delay;
SET LOCAL datestyle = 'SQL';
SHOW datestyle;
@@ -30,7 +30,7 @@ SELECT '2006-08-13 12:34:56'::timestamptz;
-- SET should be reverted after ROLLBACK
BEGIN;
SET vacuum_cost_delay TO 600;
SET vacuum_cost_delay TO 60;
SHOW vacuum_cost_delay;
SET datestyle = 'German';
SHOW datestyle;
@@ -42,12 +42,12 @@ SELECT '2006-08-13 12:34:56'::timestamptz;
-- Some tests with subtransactions
BEGIN;
SET vacuum_cost_delay TO 700;
SET vacuum_cost_delay TO 70;
SET datestyle = 'MDY';
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;
SAVEPOINT first_sp;
SET vacuum_cost_delay TO 800;
SET vacuum_cost_delay TO 80;
SHOW vacuum_cost_delay;
SET datestyle = 'German, DMY';
SHOW datestyle;
@@ -56,12 +56,12 @@ ROLLBACK TO first_sp;
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;
SAVEPOINT second_sp;
SET vacuum_cost_delay TO 900;
SET vacuum_cost_delay TO 90;
SET datestyle = 'SQL, YMD';
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;
SAVEPOINT third_sp;
SET vacuum_cost_delay TO 1000;
SET vacuum_cost_delay TO 100;
SHOW vacuum_cost_delay;
SET datestyle = 'Postgres, MDY';
SHOW datestyle;
@@ -85,7 +85,7 @@ SHOW vacuum_cost_delay;
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;
SAVEPOINT sp;
SET LOCAL vacuum_cost_delay TO 300;
SET LOCAL vacuum_cost_delay TO 30;
SHOW vacuum_cost_delay;
SET LOCAL datestyle = 'Postgres, MDY';
SHOW datestyle;
@@ -105,7 +105,7 @@ SHOW vacuum_cost_delay;
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;
SAVEPOINT sp;
SET LOCAL vacuum_cost_delay TO 300;
SET LOCAL vacuum_cost_delay TO 30;
SHOW vacuum_cost_delay;
SET LOCAL datestyle = 'Postgres, MDY';
SHOW datestyle;
@@ -121,8 +121,8 @@ SELECT '2006-08-13 12:34:56'::timestamptz;
-- SET followed by SET LOCAL
BEGIN;
SET vacuum_cost_delay TO 400;
SET LOCAL vacuum_cost_delay TO 500;
SET vacuum_cost_delay TO 40;
SET LOCAL vacuum_cost_delay TO 50;
SHOW vacuum_cost_delay;
SET datestyle = 'ISO, DMY';
SET LOCAL datestyle = 'Postgres, MDY';