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Expose the estimation of number of changed tuples since last analyze 

This value, now pg_stat_all_tables.n_mod_since_analyze, was already
tracked and used by autovacuum, but not exposed to the user.

Mark Kirkwood, review by Laurenz Albe
This commit is contained in:
Magnus Hagander 2013-07-05 15:02:09 +02:00
parent 9ce9dfdb99
commit c87ff71f37
6 changed files with 29 additions and 1 deletions
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5
doc/src/sgml/monitoring.sgml
View File

@ -950,6 +950,11 @@ postgres: <replaceable>user</> <replaceable>database</> <replaceable>host</> <re
<entry><type>bigint</></entry>
<entry>Estimated number of dead rows</entry>
</row>
<row>
<entry><structfield>n_mod_since_analyze</></entry>
<entry><type>bigint</></entry>
<entry>Estimated number of rows modified since this table was last analyzed</entry>
</row>
<row>
<entry><structfield>last_vacuum</></entry>
<entry><type>timestamp with time zone</></entry>

1
src/backend/catalog/system_views.sql
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@ -405,6 +405,7 @@ CREATE VIEW pg_stat_all_tables AS
pg_stat_get_tuples_hot_updated(C.oid) AS n_tup_hot_upd,
pg_stat_get_live_tuples(C.oid) AS n_live_tup,
pg_stat_get_dead_tuples(C.oid) AS n_dead_tup,
pg_stat_get_mod_since_analyze(C.oid) AS n_mod_since_analyze,
pg_stat_get_last_vacuum_time(C.oid) as last_vacuum,
pg_stat_get_last_autovacuum_time(C.oid) as last_autovacuum,
pg_stat_get_last_analyze_time(C.oid) as last_analyze,

17
src/backend/utils/adt/pgstatfuncs.c
View File

@ -34,6 +34,7 @@ extern Datum pg_stat_get_tuples_deleted(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_tuples_hot_updated(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_live_tuples(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_dead_tuples(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_mod_since_analyze(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_blocks_fetched(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_blocks_hit(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_last_vacuum_time(PG_FUNCTION_ARGS);
@ -265,6 +266,22 @@ pg_stat_get_dead_tuples(PG_FUNCTION_ARGS)
}
Datum
pg_stat_get_mod_since_analyze(PG_FUNCTION_ARGS)
{
Oid relid = PG_GETARG_OID(0);
int64 result;
PgStat_StatTabEntry *tabentry;
if ((tabentry = pgstat_fetch_stat_tabentry(relid)) == NULL)
result = 0;
else
result = (int64) (tabentry->changes_since_analyze);
PG_RETURN_INT64(result);
}
Datum
pg_stat_get_blocks_fetched(PG_FUNCTION_ARGS)
{

2
src/include/catalog/catversion.h
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@ -53,6 +53,6 @@
*/
/* yyyymmddN */
#define CATALOG_VERSION_NO 201307031
#define CATALOG_VERSION_NO 201307051
#endif

2
src/include/catalog/pg_proc.h
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@ -2593,6 +2593,8 @@ DATA(insert OID = 2878 ( pg_stat_get_live_tuples PGNSP PGUID 12 1 0 0 0 f f f f
DESCR("statistics: number of live tuples");
DATA(insert OID = 2879 ( pg_stat_get_dead_tuples PGNSP PGUID 12 1 0 0 0 f f f f t f s 1 0 20 "26" _null_ _null_ _null_ _null_ pg_stat_get_dead_tuples _null_ _null_ _null_ ));
DESCR("statistics: number of dead tuples");
DATA(insert OID = 3177 ( pg_stat_get_mod_since_analyze PGNSP PGUID 12 1 0 0 0 f f f f t f s 1 0 20 "26" _null_ _null_ _null_ _null_ pg_stat_get_mod_since_analyze _null_ _null_ _null_ ));
DESCR("statistics: number of tuples changed since last analyze");
DATA(insert OID = 1934 ( pg_stat_get_blocks_fetched PGNSP PGUID 12 1 0 0 0 f f f f t f s 1 0 20 "26" _null_ _null_ _null_ _null_ pg_stat_get_blocks_fetched _null_ _null_ _null_ ));
DESCR("statistics: number of blocks fetched");
DATA(insert OID = 1935 ( pg_stat_get_blocks_hit PGNSP PGUID 12 1 0 0 0 f f f f t f s 1 0 20 "26" _null_ _null_ _null_ _null_ pg_stat_get_blocks_hit _null_ _null_ _null_ ));

3
src/test/regress/expected/rules.out
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@ -1626,6 +1626,7 @@ SELECT viewname, definition FROM pg_views WHERE schemaname <> 'information_schem
| pg_stat_get_tuples_hot_updated(c.oid) AS n_tup_hot_upd, +
| pg_stat_get_live_tuples(c.oid) AS n_live_tup, +
| pg_stat_get_dead_tuples(c.oid) AS n_dead_tup, +
| pg_stat_get_mod_since_analyze(c.oid) AS n_mod_since_analyze, +
| pg_stat_get_last_vacuum_time(c.oid) AS last_vacuum, +
| pg_stat_get_last_autovacuum_time(c.oid) AS last_autovacuum, +
| pg_stat_get_last_analyze_time(c.oid) AS last_analyze, +
@ -1720,6 +1721,7 @@ SELECT viewname, definition FROM pg_views WHERE schemaname <> 'information_schem
| pg_stat_all_tables.n_tup_hot_upd, +
| pg_stat_all_tables.n_live_tup, +
| pg_stat_all_tables.n_dead_tup, +
| pg_stat_all_tables.n_mod_since_analyze, +
| pg_stat_all_tables.last_vacuum, +
| pg_stat_all_tables.last_autovacuum, +
| pg_stat_all_tables.last_analyze, +
@ -1762,6 +1764,7 @@ SELECT viewname, definition FROM pg_views WHERE schemaname <> 'information_schem
| pg_stat_all_tables.n_tup_hot_upd, +
| pg_stat_all_tables.n_live_tup, +
| pg_stat_all_tables.n_dead_tup, +
| pg_stat_all_tables.n_mod_since_analyze, +
| pg_stat_all_tables.last_vacuum, +
| pg_stat_all_tables.last_autovacuum, +
| pg_stat_all_tables.last_analyze, +