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安裝過程如下：進入安裝包的contrib/pg_stat_statements目錄，執行編譯和安裝動作：
[root@server pg_stat_statements]# pwd /soft/postgresql-9.1.2/contrib/pg_stat_statements [root@server pg_stat_statements]# make && make install make: `all' に対して行うべき事はありません.
/bin/mkdir -p '/usr/local/pgsql/lib' /bin/mkdir -p '/usr/local/pgsql/share/extension' /bin/sh ../../config/install-sh -c -m 755 pg_stat_statements.so '/usr/local/pgsql/lib/pg_stat_statements.so' /bin/sh ../../config/install-sh -c -m 644 ./pg_stat_statements.control '/usr/local/pgsql/share/extension/' /bin/sh ../../config/install-sh -c -m 644 ./pg_stat_statements--1.0.sql ./pg_stat_statements--unpackaged--1.0.sql '/usr/local/pgsql/share/extension/' [root@server pg_stat_statements]#
然后，由於pg_stat_statements 既使用了hook，同時又是以 extension 形式被使用，所以需要再作兩件事情：
A: 在postgresql.conf中，進行配置：
shared_preload_libraries = 'pg_stat_statements' # (change requires restart) custom_variable_classes = 'pg_stat_statements' pg_stat_statements.max = 1000 pg_stat_statements.track = top pg_stat_statements.track_utility = true pg_stat_statements.save = true
shared_preload_libraries = 'pg_stat_statements'，表示要在啟動時導入pg_stat_statements 動態庫。
custom_variable_classes = 'pg_stat_statements'，是為了其下面的幾個配置項。
pg_stat_statements.max = 1000，表示監控的語句最多為1000句。
pg_stat_statements.track = top，表示不監控嵌套的sql語句。
pg_stat_statements.track_utility = true，表示對 INSERT/UPDATE/DELETE/SELECT 之外的sql動作也作監控。
pg_stat_statements.save = true，表示當postgresql停止時，把信息存入磁盤文件以備下次啟動時再使用。
B: 重新啟動 postgresql，然后生成 extension:
[root@server ~]# su - postgres [postgres@server ~]$ pwd /home/postgres [postgres@server ~]$ cd /usr/local/pgsql [postgres@server pgsql]$ ./bin/psql -d postgres psql (9.1.2) Type "help" for help. postgres=# create extension pg_stat_statements; CREATE EXTENSION postgres=#
簡單驗證：
postgres=# select count(*) from pg_stat_statements; count
-------
2 (1 row) postgres=# \x Expanded display is on. postgres=# select * from pg_stat_statements; -[ RECORD 1 ]-------+----------------------------------------------------------- -------------------------------------------------------------------------------- -------------------------------------
userid | 10 dbid | 12699 query | select count(*) from pg_stat_statements; calls | 1 total_time | 5.4e-05 rows | 1 shared_blks_hit | 0 shared_blks_read | 0 shared_blks_written | 0 local_blks_hit | 0 local_blks_read | 0 local_blks_written | 0 temp_blks_read | 0 temp_blks_written | 0
-[ RECORD 2 ]-------+----------------------------------------------------------- -------------------------------------------------------------------------------- -------------------------------------
userid | 10 dbid | 12699 query | SELECT n.nspname as "Schema", | c.relname as "Name", | CASE c.relkind WHEN 'r' THEN 'table' WHEN 'v' THEN 'view' WHEN 'i' THEN 'index' WHEN 'S' THEN 'sequence' WHEN 's' THEN 'special' WHEN 'f' THEN 'foreign table' END as "T ype", | pg_catalog.pg_get_userbyid(c.relowner) as "Owner" | FROM pg_catalog.pg_class c | LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace | WHERE c.relkind IN ('r','v','S','f','') | AND n.nspname <> 'pg_catalog'
| AND n.nspname <> 'information_schema'
| AND n.nspname !~ '^pg_toast'
| AND pg_catalog.pg_table_is_visible(c.oid) | ORDER BY 1,2; calls | 1 total_time | 0.00081 rows | 0 shared_blks_hit | 564 shared_blks_read | 1 shared_blks_written | 0 local_blks_hit | 0 local_blks_read | 0 local_blks_written | 0 temp_blks_read | 0 temp_blks_written | 0
-[ RECORD 3 ]-------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------- -----
userid | 10 dbid | 12699 query | create extension pg_stat_statements; calls | 1 total_time | 0.199004 rows | 0 shared_blks_hit | 489 shared_blks_read | 105 shared_blks_written | 0 local_blks_hit | 0 local_blks_read | 0 local_blks_written | 0 temp_blks_read | 0 temp_blks_written | 0 postgres=#
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磨礪技術珠磯，踐行數據之道，追求卓越價值