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mhagandermhagander
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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
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6 files changed

+29
-1
lines changed

6 files changed

+29
-1
lines changed

‎doc/src/sgml/monitoring.sgml

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

‎src/backend/catalog/system_views.sql

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

‎src/backend/utils/adt/pgstatfuncs.c

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

‎src/include/catalog/catversion.h

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@@ -53,6 +53,6 @@
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*/
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/* yyyymmddN */
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#define CATALOG_VERSION_NO 201307031
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#define CATALOG_VERSION_NO 201307051
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#endif

‎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
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DESCR("statistics: number of live tuples");
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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_ ));
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DESCR("statistics: number of dead tuples");
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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_ ));
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DESCR("statistics: number of tuples changed since last analyze");
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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_ ));
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DESCR("statistics: number of blocks fetched");
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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_ ));

‎src/test/regress/expected/rules.out

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@@ -1626,6 +1626,7 @@ SELECT viewname, definition FROM pg_views WHERE schemaname <> 'information_schem
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| pg_stat_get_tuples_hot_updated(c.oid) AS n_tup_hot_upd, +
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| pg_stat_get_live_tuples(c.oid) AS n_live_tup, +
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| pg_stat_get_dead_tuples(c.oid) AS n_dead_tup, +
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| pg_stat_get_mod_since_analyze(c.oid) AS n_mod_since_analyze, +
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| pg_stat_get_last_vacuum_time(c.oid) AS last_vacuum, +
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| pg_stat_get_last_autovacuum_time(c.oid) AS last_autovacuum, +
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| 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
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| pg_stat_all_tables.n_tup_hot_upd, +
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| pg_stat_all_tables.n_live_tup, +
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| pg_stat_all_tables.n_dead_tup, +
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| pg_stat_all_tables.n_mod_since_analyze, +
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| pg_stat_all_tables.last_vacuum, +
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| pg_stat_all_tables.last_autovacuum, +
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| pg_stat_all_tables.last_analyze, +
@@ -1762,6 +1764,7 @@ SELECT viewname, definition FROM pg_views WHERE schemaname <> 'information_schem
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| pg_stat_all_tables.n_tup_hot_upd, +
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| pg_stat_all_tables.n_live_tup, +
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| pg_stat_all_tables.n_dead_tup, +
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| pg_stat_all_tables.n_mod_since_analyze, +
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| pg_stat_all_tables.last_vacuum, +
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| pg_stat_all_tables.last_autovacuum, +
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| pg_stat_all_tables.last_analyze, +

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