{"id":122,"date":"2020-05-18T02:00:22","date_gmt":"2020-05-18T02:00:22","guid":{"rendered":"https:\/\/ptune.jp\/tech\/?p=122"},"modified":"2020-07-30T11:23:32","modified_gmt":"2020-07-30T02:23:32","slug":"how-to-check-postgresql-slow-query","status":"publish","type":"post","link":"https:\/\/ptune.jp\/tech\/how-to-check-postgresql-slow-query\/","title":{"rendered":"\u30b9\u30ed\u30fc\u30af\u30a8\u30ea\u306e\u78ba\u8a8d\u65b9\u6cd5\uff1aPostgreSQL\u7de8"},"content":{"rendered":"<p>\u30b9\u30ed\u30fc\u30af\u30a8\u30ea\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u5074\u306e\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u3068\u3057\u3066\u3088\u304f\u73fe\u308c\u308b\u3001\u51e6\u7406\u901f\u5ea6\u304c\u9045\u3044SQL\u3067\u3059\u3002\u610f\u56f3\u305b\u305a\u30d5\u30eb\u30b9\u30ad\u30e3\u30f3\u3092\u3057\u3066\u3044\u308b\u30b1\u30fc\u30b9\u304c\u591a\u304f\u3001\u30c7\u30fc\u30bf\u4ef6\u6570\u304c\u5897\u3048\u308b\u306b\u3064\u308c\u3066\u6025\u6fc0\u306b\u6027\u80fd\u554f\u984c\u3092\u5f15\u304d\u8d77\u3053\u3057\u307e\u3059\u3002\u8ca0\u8377\u30c6\u30b9\u30c8\u5b9f\u65bd\u6642\u306b\u306f1\u79d2\u4ee5\u4e0a\u304b\u304b\u308b\u3082\u306e\u306f\u628a\u63e1\u3057\u3066\u304a\u304f\u3068\u3088\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u30b9\u30ed\u30fc\u30af\u30a8\u30ea\u3078\u306e\u5bfe\u51e6\u306f\u6b21\u306e3\u30b9\u30c6\u30c3\u30d7\u3067\u884c\u3044\u307e\u3059\u3002<\/p>\n<ol>\n<li>\u30b9\u30ed\u30fc\u30af\u30a8\u30ea\u3092\u7279\u5b9a\u3059\u308b<\/li>\n<li>\u30b9\u30ed\u30fc\u30af\u30a8\u30ea\u3092\u89e3\u6790\u3059\u308b<\/li>\n<li>\u30b9\u30ed\u30fc\u30af\u30a8\u30ea\u3092\u6539\u4fee\u3059\u308b<\/li>\n<\/ol>\n<p>MySQL\u3001PostgreSQL\u3001Oracle\u306a\u3069\u8907\u6570\u306eRDBMS\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u57fa\u672c\u7684\u306a\u6d41\u308c\u306f\u5171\u901a\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001PostgreSQL12\u3092\u5bfe\u8c61\u306b3\u30b9\u30c6\u30c3\u30d7\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<h2>1\uff0e\u30b9\u30ed\u30fc\u30af\u30a8\u30ea\u3092\u7279\u5b9a\u3059\u308b<\/h2>\n<h3>\u30b9\u30ed\u30fc\u30af\u30a8\u30ea\u306e\u8a2d\u5b9a<\/h3>\n<p>\u300cpg_stat_statements\u300d\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001SQL\u3092\u4f7f\u3063\u3066\u30b9\u30ed\u30fc\u30af\u30a8\u30ea\u3092\u62bd\u51fa\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u4e0b\u8a18\u624b\u9806\u3067\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-bash\"># \u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3092\u884c\u3046\n# yum install -y postgresql12-contrib\n\n# \u6709\u52b9\u5316\n# su - postgres\n# psql\npostgres=# select * from pg_available_extensions where name = &#039;pg_stat_statements&#039;;\n        name        | default_version | installed_version |                          comment\n--------------------+-----------------+-------------------+-----------------------------------------------------------\n pg_stat_statements | 1.7             |                   | track execution statistics of all SQL statements executed\n(1 row)\n\npostgres=# CREATE EXTENSION pg_stat_statements;\nCREATE EXTENSION\n\npostgres=# select * from pg_available_extensions where name = &#039;pg_stat_statements&#039;;\n        name        | default_version | installed_version |                          comment\n--------------------+-----------------+-------------------+-----------------------------------------------------------\n pg_stat_statements | 1.7             | 1.7               | track execution statistics of all SQL statements executed\n(1 row)\n<\/code><\/pre>\n<p>postgresql.conf\u3078\u4e0b\u8a18\u3092\u8ffd\u52a0\u3057\u3001\u518d\u8d77\u52d5\u3092\u5b9f\u65bd\u3057\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-bash\">shared_preload_libraries = &#039;pg_stat_statements&#039;<\/code><\/pre>\n<h2>2\uff0e\u30b9\u30ed\u30fc\u30af\u30a8\u30ea\u3092\u89e3\u6790\u3059\u308b<\/h2>\n<h3>\u30b9\u30ed\u30fc\u30af\u30a8\u30ea\u306e\u898b\u65b9<\/h3>\n<p>SQL\u6587\u3067\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002calls\u3084total_time\u3067\u30bd\u30fc\u30c8\u3092\u3059\u308b\u3053\u3068\u3067\u5fc5\u8981\u306aSQL\u306e\u53d6\u5f97\u3092\u884c\u3044\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre><code class=\"language-bash\">postgres=# \\x\nExpanded display is on.\n\npostgres=#  SELECT * FROM pg_stat_statements order by total_time desc limit 1;\n-[ RECORD 1 ]-------+--------------------\nuserid              | 10\ndbid                | 14187\nqueryid             | 8068993708030807443\nquery               | select pg_sleep($1)\ncalls               | 1\ntotal_time          | 2002.162921\nmin_time            | 2002.162921\nmax_time            | 2002.162921\nmean_time           | 2002.162921\nstddev_time         | 0\nrows                | 1\nshared_blks_hit     | 0\nshared_blks_read    | 0\nshared_blks_dirtied | 0\nshared_blks_written | 0\nlocal_blks_hit      | 0\nlocal_blks_read     | 0\nlocal_blks_dirtied  | 0\nlocal_blks_written  | 0\ntemp_blks_read      | 0\ntemp_blks_written   | 0\nblk_read_time       | 0\nblk_write_time      | 0\n<\/code><\/pre>\n<h3>\u30b9\u30ed\u30fc\u30af\u30a8\u30ea\u306e\u89e3\u6790<\/h3>\n<p>\u30b9\u30ed\u30fc\u30af\u30a8\u30ea\u306e\u89e3\u6790\u306f\u300cExplain\u300d\u30b3\u30de\u30f3\u30c9\u3092\u5229\u7528\u3057\u307e\u3059\u3002explain\u306e\u5f8c\u306b\u30af\u30a8\u30ea\u3092\u5165\u308c\u308b\u3053\u3068\u3067\u30af\u30a8\u30ea\u306e\u5b9f\u884c\u30d1\u30b9\u306e\u60c5\u5831\u3092\u53d6\u5f97\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-bash\">postgres=# explain select pg_sleep(3);\n                QUERY PLAN\n------------------------------------------\n Result  (cost=0.00..0.01 rows=1 width=4)\n(1 row)\n<\/code><\/pre>\n<p>\u30b5\u30f3\u30d7\u30eb\u306eSQL\u306f\u30b9\u30ea\u30fc\u30d7\u3055\u305b\u3066\u3044\u308b\u3060\u3051\u306a\u306e\u3067\u3001\u5b9f\u884c\u8a08\u753b\u304c\u307b\u307c\u3042\u308a\u307e\u305b\u3093\u3002\u8aad\u307f\u89e3\u304d\u65b9\u306f\u672c\u5bb6\u306e\u30b5\u30a4\u30c8\u306b\u308f\u304b\u308a\u3084\u3059\u304f\u307e\u3068\u3081\u3066\u3042\u308b\u306e\u3067\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u53c2\u8003\uff0d\uff1e<a href=\"https:\/\/lets.postgresql.jp\/documents\/technical\/query_tuning\/\">Explaining Explain \uff5e PostgreSQL\u306e\u5b9f\u884c\u8a08\u753b\u3092\u8aad\u3080 <\/a><\/p>\n<p>\u307e\u305f\u3001\u300cexplain\u300d\u3092\u300cexplain analyze\u300d\u30b3\u30de\u30f3\u30c9\u3078\u5909\u66f4\u3059\u308b\u3053\u3068\u3067\u3001\u53d6\u5f97\u3059\u308b\u6642\u9593\u306b\u3064\u3044\u3066\u3082\u8abf\u3079\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<p>\u53c2\u8003\uff0d\uff1e<a href=\"http:\/\/naoberry.com\/tech\/psql-explainanalyze\/#Explain-4\">PostgreSQL\u306eExplain analyze\u3092\u8aad\u307f\u3084\u3059\u304f\u3059\u308b\u65b9\u6cd5<\/a><\/p>\n<h2>3\uff0e\u30b9\u30ed\u30fc\u30af\u30a8\u30ea\u3092\u6539\u4fee\u3059\u308b<\/h2>\n<p>\u30b9\u30ed\u30fc\u30af\u30a8\u30ea\u306e\u6539\u4fee\u306f\u6b21\u306e\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u5b9f\u65bd\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<ul>\n<li>\u307e\u305a\u306f\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u8ffd\u52a0\u3067\u89e3\u6d88\u3057\u306a\u3044\u304b\u691c\u8a0e\u3059\u308b<\/li>\n<li>SQL\u3092\u6539\u4fee\u3059\u308b\u5834\u5408\u306f\u3001\u53d6\u5f97\u7d50\u679c\u304c\u5909\u308f\u3089\u306a\u3044\u3088\u3046\u306b\u614e\u91cd\u306b<\/li>\n<li>\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u6539\u4fee\u3082\u8996\u91ce\u306b\u5165\u308c\u308b<\/li>\n<\/ul>\n<h2>\u53c2\u8003\u3000\u30b9\u30ed\u30fc\u30af\u30a8\u30ea\u3092\u30d5\u30a1\u30a4\u30eb\u3078\u51fa\u529b\u3059\u308b\u65b9\u6cd5<\/h2>\n<p>\u89e3\u6790\u3059\u308b\u306e\u304c\u5927\u5909\u306b\u306a\u308a\u307e\u3059\u304c\u3001\u30b9\u30ed\u30fc\u30af\u30a8\u30ea\u3092\u30d5\u30a1\u30a4\u30eb\u3078\u51fa\u529b\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002\u300cpg_stat_statements\u300d\u306e\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u304c\u96e3\u3057\u3044\u5834\u5408\u306f\u3053\u3061\u3089\u3092\u5229\u7528\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>\u8a2d\u5b9a<\/h3>\n<p>postgresql.conf\u3078\u4e0b\u8a18\u3092\u8ffd\u52a0\u3057\u3001PostgreSQL\u306e\u518d\u8d77\u52d5\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-bash\">log_directory = &#039;log&#039;\nlog_filename = &#039;postgresql-%a.log&#039;\nlog_min_duration_statement = 1s<\/code><\/pre>\n<p>\u6a19\u6e96\u3067\u306f\u3001\u300c\/var\/lib\/pgsql\/12\/data\/log\/postgresql-Tue.log\u300d\u3078\u8a72\u5f53SQL\u304c\u51fa\u529b\u3055\u308c\u307e\u3059\u3002<\/p>\n<h3>\u30b9\u30ed\u30fc\u30af\u30a8\u30ea\u306e\u898b\u65b9<\/h3>\n<p>\u30ed\u30b0\u30d5\u30a1\u30a4\u30eb\u3078\u30b9\u30ed\u30fc\u30af\u30a8\u30ea\u306f\u6b21\u306e\u3088\u3046\u306b\u51fa\u529b\u3055\u308c\u307e\u3059\u3002\u4e0b\u8a18\u306f3\u79d2\u30b9\u30ea\u30fc\u30d7\u3059\u308bSQL\u3092\u6d41\u3057\u3066\u307f\u305f\u5834\u5408\u306e\u30b9\u30ed\u30fc\u30af\u30a8\u30ea\u30ed\u30b0\u3067\u3059\u3002<\/p>\n<pre><code class=\"language-bash\">2020-05-12 11:41:57.451 JST [5251] LOG:  duration: 3000.677 ms  statement: select pg_sleep(3);\n<\/code><\/pre>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u30b9\u30ed\u30fc\u30af\u30a8\u30ea\u306f\u30b7\u30b9\u30c6\u30e0\u306e\u6027\u80fd\u306b\u5927\u304d\u306a\u5f71\u97ff\u3092\u4e0e\u3048\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u30b9\u30ed\u30fc\u30af\u30a8\u30ea\u3092\u53d6\u5f97\u3057\u3001\u5f71\u97ff\u5ea6\u306e\u5927\u304d\u3044\u3082\u306e\u3092\u7279\u5b9a\u3057\u6539\u4fee\u3059\u308b\u3053\u3068\u3067\u5927\u5e45\u306a\u6027\u80fd\u6539\u5584\u304c\u898b\u8fbc\u3081\u308b\u305f\u3081\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PostgreSQL\u306e\u30b9\u30ed\u30fc\u30af\u30a8\u30ea\u7279\u5b9a\u304b\u3089\u89e3\u6790\u30fb\u6539\u4fee\u65b9\u6cd5\u3092\u89e3\u8aac\u3002\u30b9\u30ed\u30fc\u30af\u30a8\u30ea\u306f\u30b7\u30b9\u30c6\u30e0\u306e\u6027\u80fd\u306b\u5927\u304d\u306a\u5f71\u97ff\u3092\u4e0e\u3048\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u30b9\u30ed\u30fc\u30af\u30a8\u30ea\u3092\u53d6\u5f97\u3057\u3001\u5f71\u97ff\u5ea6\u306e\u5927\u304d\u3044\u3082\u306e\u3092\u7279\u5b9a\u3001\u6539\u4fee\u3059\u308b\u3053\u3068\u3067\u5927\u5e45\u306a\u6027\u80fd\u6539\u5584\u304c\u898b\u8fbc\u3081\u307e\u3059\u3002<\/p>\n<p> 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