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postgresql
15th chunk of `doc/src/sgml/pgstatstatements.sgml`
0ab2409eff8dc6eed4487e28452c60843f992c0e1a84ae160000000100000cff
    | 98.8454011741682975
-[ RECORD 5 ]---+--------------------------------------------------&zwsp;------------------
query           | alter table pgbench_accounts add primary key (aid)
calls           | 1
total_exec_time | 160.588563
rows            | 0
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_exec_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_exec_time DESC LIMIT 5;
-[ RECORD 1 ]---+--------------------------------------------------&zwsp;------------------
query           | UPDATE pgbench_tellers SET tbalance = tbalance + $1 WHERE tid = $2
calls           | 3000
total_exec_time | 20756.669379
rows            | 3000
hit_percent     | 100.0000000000000000
-[ RECORD 2 ]---+--------------------------------------------------&zwsp;------------------
query           | copy pgbench_accounts from stdin
calls           | 1
total_exec_time | 291.865911
rows            | 100000
hit_percent     | 100.0000000000000000
-[ RECORD 3 ]---+--------------------------------------------------&zwsp;------------------
query           | UPDATE pgbench_accounts SET abalance = abalance + $1 WHERE aid = $2
calls           | 3000
total_exec_time | 271.232977
rows            | 3000
hit_percent     | 98.8454011741682975
-[ RECORD 4 ]---+--------------------------------------------------&zwsp;------------------
query           | alter table pgbench_accounts add primary key (aid)
calls           | 1
total_exec_time | 160.588563
rows            | 0
hit_percent     | 100.0000000000000000
-[ RECORD 5 ]---+--------------------------------------------------&zwsp;------------------
query           | vacuum analyze pgbench_accounts
calls           | 1
total_exec_time | 136.448116
rows            | 0
hit_percent     | 99.9201915403032721

bench=# SELECT pg_stat_statements_reset(0,0,0);

bench=# SELECT query, calls, total_exec_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_exec_time DESC LIMIT 5;
-[ RECORD 1 ]---+--------------------------------------------------&zwsp;---------------------------
query           | SELECT pg_stat_statements_reset(0,0,0)
calls           | 1
total_exec_time | 0.189497
rows            | 1
hit_percent     |
-[ RECORD 2 ]---+--------------------------------------------------&zwsp;---------------------------
query           | SELECT query, calls, total_exec_time, rows, $1 * shared_blks_hit /          +
                |                nullif(shared_blks_hit + shared_blks_read, $2) AS hit_percent+
                |           FROM pg_stat_statements ORDER BY total_exec_time DESC LIMIT $3
calls           | 0
total_exec_time | 0
rows            | 0
hit_percent     |

</screen>
 </sect2>

 <sect2 id="pgstatstatements-authors">
  <title>Authors</title>

  <para>
   Takahiro Itagaki <email>itagaki.takahiro@oss.ntt.co.jp</email>.
   Query normalization added by Peter Geoghegan <email>peter@2ndquadrant.com</email>.
  </para>
 </sect2>

</sect1>
Title: pg_stat_statements Query Statistics and Authors
Summary
The provided text continues to demonstrate SQL queries for retrieving statement execution statistics from pg_stat_statements, including query, calls, total execution time, rows, and hit percentage, and also shows the results of resetting query statistics using the pg_stat_statements_reset function, followed by information about the authors of pg_stat_statements, including Takahiro Itagaki and Peter Geoghegan.