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Increase the default value of default_statistics_target from 10 to 100,

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and its maximum value from 1000 to 10000.  ALTER TABLE SET STATISTICS
similarly now allows a value up to 10000.  Per discussion.
This commit is contained in:
Tom Lane
2008-12-13 19:13:44 +00:00
parent b69bde7749
commit 65e3ea7641
9 changed files with 27 additions and 27 deletions
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10
src/backend/tsearch/ts_typanalyze.c
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@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/tsearch/ts_typanalyze.c,v 1.3 2008/11/27 21:17:39 heikki Exp $
* $PostgreSQL: pgsql/src/backend/tsearch/ts_typanalyze.c,v 1.4 2008/12/13 19:13:44 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -63,7 +63,7 @@ ts_typanalyze(PG_FUNCTION_ARGS)
attr->attstattarget = default_statistics_target;
stats->compute_stats = compute_tsvector_stats;
/* see comment about the choice of minrows from analyze.c */
/* see comment about the choice of minrows in commands/analyze.c */
stats->minrows = 300 * attr->attstattarget;
PG_RETURN_BOOL(true);
@@ -105,8 +105,8 @@ ts_typanalyze(PG_FUNCTION_ARGS)
* is no more than a few times w.
*
* We use a hashtable for the D structure and a bucket width of
* statistic_target * 100, where 100 is an arbitrarily chosen constant, meant
* to approximate the number of lexemes in a single tsvector.
* statistics_target * 100, where 100 is an arbitrarily chosen constant,
* meant to approximate the number of lexemes in a single tsvector.
*/
static void
compute_tsvector_stats(VacAttrStats *stats,
@@ -130,7 +130,7 @@ compute_tsvector_stats(VacAttrStats *stats,
LexemeHashKey hash_key;
TrackItem *item;
/* We want statistic_target * 100 lexemes in the MCELEM array */
/* We want statistics_target * 100 lexemes in the MCELEM array */
num_mcelem = stats->attr->attstattarget * 100;
/*