diff options
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/pgstatstatements.sgml | 106 |
1 files changed, 82 insertions, 24 deletions
diff --git a/doc/src/sgml/pgstatstatements.sgml b/doc/src/sgml/pgstatstatements.sgml index c0217ed485f..26bb82da4a8 100644 --- a/doc/src/sgml/pgstatstatements.sgml +++ b/doc/src/sgml/pgstatstatements.sgml @@ -336,7 +336,7 @@ <variablelist> <varlistentry> <term> - <function>pg_stat_statements_reset() returns void</function> + <function>pg_stat_statements_reset(userid Oid, dbid Oid, queryid bigint) returns void</function> <indexterm> <primary>pg_stat_statements_reset</primary> </indexterm> @@ -344,9 +344,16 @@ <listitem> <para> - <function>pg_stat_statements_reset</function> discards all statistics - gathered so far by <filename>pg_stat_statements</filename>. - By default, this function can only be executed by superusers. + <function>pg_stat_statements_reset</function> discards statistics + gathered so far by <filename>pg_stat_statements</filename> corresponding + to the specified <structfield>userid</structfield>, <structfield>dbid</structfield> + and <structfield>queryid</structfield>. If any of the parameters are not + specified, the default value <literal>0</literal>(invalid) is used for + each of them and the statistics that match with other parameters will be + reset. If no parameter is specified or all the specified parameters are + <literal>0</literal>(invalid), it will discard all statistics. By + default, this function can only be executed by superusers. Access may be + granted to others using <command>GRANT</command>. </para> </listitem> </varlistentry> @@ -494,36 +501,87 @@ bench=# \x bench=# SELECT query, calls, total_time, rows, 100.0 * shared_blks_hit / nullif(shared_blks_hit + shared_blks_read, 0) AS hit_percent FROM pg_stat_statements ORDER BY total_time DESC LIMIT 5; --[ RECORD 1 ]--------------------------------------------------------------------- -query | UPDATE pgbench_branches SET bbalance = bbalance + $1 WHERE bid = $2; +-[ RECORD 1 ]-------------------------------------------------------------------- +query | UPDATE pgbench_branches SET bbalance = bbalance + $1 WHERE bid = $2 calls | 3000 -total_time | 9609.00100000002 -rows | 2836 -hit_percent | 99.9778970000200936 --[ RECORD 2 ]--------------------------------------------------------------------- -query | UPDATE pgbench_tellers SET tbalance = tbalance + $1 WHERE tid = $2; +total_time | 25565.855387 +rows | 3000 +hit_percent | 100.0000000000000000 +-[ RECORD 2 ]-------------------------------------------------------------------- +query | UPDATE pgbench_tellers SET tbalance = tbalance + $1 WHERE tid = $2 calls | 3000 -total_time | 8015.156 -rows | 2990 -hit_percent | 99.9731126579631345 --[ RECORD 3 ]--------------------------------------------------------------------- +total_time | 20756.669379 +rows | 3000 +hit_percent | 100.0000000000000000 +-[ RECORD 3 ]-------------------------------------------------------------------- query | copy pgbench_accounts from stdin calls | 1 -total_time | 310.624 +total_time | 291.865911 rows | 100000 -hit_percent | 0.30395136778115501520 --[ RECORD 4 ]--------------------------------------------------------------------- -query | UPDATE pgbench_accounts SET abalance = abalance + $1 WHERE aid = $2; +hit_percent | 100.0000000000000000 +-[ RECORD 4 ]-------------------------------------------------------------------- +query | UPDATE pgbench_accounts SET abalance = abalance + $1 WHERE aid = $2 calls | 3000 -total_time | 271.741999999997 +total_time | 271.232977 rows | 3000 -hit_percent | 93.7968855088209426 --[ RECORD 5 ]--------------------------------------------------------------------- +hit_percent | 98.5723926698852723 +-[ RECORD 5 ]-------------------------------------------------------------------- query | alter table pgbench_accounts add primary key (aid) calls | 1 -total_time | 81.42 +total_time | 160.588563 rows | 0 -hit_percent | 34.4947735191637631 +hit_percent | 100.0000000000000000 + + +bench=# SELECT pg_stat_statements_reset(0,0,s.queryid) FROM pg_stat_statements AS s + WHERE s.query = 'UPDATE pgbench_branches SET bbalance = bbalance + $1 WHERE bid = $2'; + +bench=# SELECT query, calls, total_time, rows, 100.0 * shared_blks_hit / + nullif(shared_blks_hit + shared_blks_read, 0) AS hit_percent + FROM pg_stat_statements ORDER BY total_time DESC LIMIT 5; +-[ RECORD 1 ]-------------------------------------------------------------------- +query | UPDATE pgbench_tellers SET tbalance = tbalance + $1 WHERE tid = $2 +calls | 3000 +total_time | 20756.669379 +rows | 3000 +hit_percent | 100.0000000000000000 +-[ RECORD 2 ]-------------------------------------------------------------------- +query | copy pgbench_accounts from stdin +calls | 1 +total_time | 291.865911 +rows | 100000 +hit_percent | 100.0000000000000000 +-[ RECORD 3 ]-------------------------------------------------------------------- +query | UPDATE pgbench_accounts SET abalance = abalance + $1 WHERE aid = $2 +calls | 3000 +total_time | 271.232977 +rows | 3000 +hit_percent | 98.5723926698852723 +-[ RECORD 4 ]-------------------------------------------------------------------- +query | alter table pgbench_accounts add primary key (aid) +calls | 1 +total_time | 160.588563 +rows | 0 +hit_percent | 100.0000000000000000 +-[ RECORD 5 ]-------------------------------------------------------------------- +query | vacuum analyze pgbench_accounts +calls | 1 +total_time | 136.448116 +rows | 0 +hit_percent | 99.9201915403032721 + +bench=# SELECT pg_stat_statements_reset(0,0,0); + +bench=# SELECT query, calls, total_time, rows, 100.0 * shared_blks_hit / + nullif(shared_blks_hit + shared_blks_read, 0) AS hit_percent + FROM pg_stat_statements ORDER BY total_time DESC LIMIT 5; +-[ RECORD 1 ]--------------------------------------- +query | SELECT pg_stat_statements_reset(0,0,0) +calls | 1 +total_time | 0.189497 +rows | 1 +hit_percent | + </screen> </sect2> |