{"id":3542,"date":"2026-10-24T11:32:43","date_gmt":"2026-10-24T02:32:43","guid":{"rendered":"https:\/\/qol-kk.com\/wp2\/?p=3542"},"modified":"2026-10-24T11:32:43","modified_gmt":"2026-10-24T02:32:43","slug":"20261017-plan062","status":"publish","type":"post","link":"https:\/\/qol-kk.com\/wp2\/blog\/2026\/10\/24\/20261017-plan062\/","title":{"rendered":"EXPLAIN \u306e\u8aad\u307f\u65b9\u3068\u5b9f\u884c\u8a08\u753b\u306e\u6539\u5584 \u30cf\u30f3\u30ba\u30aa\u30f3"},"content":{"rendered":"<h2>\u6982\u8981<\/h2>\n<p>\u300c\u4e00\u89a7\u753b\u9762\u304c\u91cd\u3044\u300d\u300c\u591c\u9593\u30d0\u30c3\u30c1\u304c\u7d42\u308f\u3089\u306a\u3044\u300d\u3002\u3053\u306e\u7a2e\u306e\u76f8\u8ac7\u306e\u591a\u304f\u306f\u3001\u7279\u5b9a\u306e SQL \u304c\u60f3\u5b9a\u5916\u306e\u30a2\u30af\u30bb\u30b9\u7d4c\u8def\uff08\u5b9f\u884c\u8a08\u753b\uff09\u3067\u52d5\u3044\u3066\u3044\u308b\u3053\u3068\u304c\u539f\u56e0\u3067\u3059\u3002\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u8ffd\u52a0\u3059\u308c\u3070\u76f4\u308b\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u304c\u3001\u307e\u305a\u5fc5\u8981\u306a\u306e\u306f\u300cDB \u304c\u4eca\u3069\u3046\u52d5\u3044\u3066\u3044\u308b\u304b\u300d\u3092\u6b63\u78ba\u306b\u8aad\u3080\u3053\u3068\u3067\u3059\u3002<\/p>\n<p>\u672c\u8a18\u4e8b\u3067\u306f <code>EXPLAIN<\/code> \u306e\u51fa\u529b\u306e\u8aad\u307f\u65b9\u3068\u3001\u305d\u3053\u304b\u3089\u5b9f\u884c\u8a08\u753b\u3092\u6539\u5584\u3059\u308b\u624b\u9806\u3092\u3001\u518d\u73fe\u53ef\u80fd\u306a\u5f62\u3067\u307e\u3068\u3081\u307e\u3059\u3002\u5bfe\u8c61\u306f MySQL 8.0 \u3068 PostgreSQL 14 \u4ee5\u964d\u3002\u516c\u958b\u3055\u308c\u3066\u3044\u308b\u4e00\u822c\u7684\u306a\u6319\u52d5\u306e\u307f\u3092\u6271\u3044\u307e\u3059\u3002<\/p>\n<h2>\u691c\u8a3c\u74b0\u5883<\/h2>\n<ul>\n<li>MySQL 8.0 \/ PostgreSQL 14 \u4ee5\u964d<\/li>\n<li><strong>\u672c\u756a\u76f8\u5f53\u306e\u30c7\u30fc\u30bf\u91cf\uff08\u6700\u4f4e\u3067\u3082\u6570\u4e07\u301c\u6570\u5341\u4e07\u884c\uff09\u3067\u8a08\u6e2c\u3059\u308b\u3053\u3068<\/strong>\u3002\u5c11\u91cf\u30c7\u30fc\u30bf\u3060\u3068 DB \u304c\u30d5\u30eb\u30b9\u30ad\u30e3\u30f3\u3092\u9078\u3073\u3001\u8a08\u753b\u306e\u5584\u3057\u60aa\u3057\u304c\u898b\u3048\u307e\u305b\u3093<\/li>\n<\/ul>\n<pre class=\"lang:default decode:true\">CREATE TABLE orders (\n  id          BIGINT PRIMARY KEY AUTO_INCREMENT,\n  user_id     BIGINT      NOT NULL,\n  status      VARCHAR(20) NOT NULL,\n  total_price INT         NOT NULL,\n  created_at  DATETIME    NOT NULL\n);\n-- \u64ec\u4f3c\u30c7\u30fc\u30bf\u3092\u5927\u91cf\u6295\u5165\u3057\u3066\u304b\u3089\u8a08\u6e2c\u3059\u308b<\/pre>\n<h2>\u767a\u751f\u3057\u305f\u554f\u984c<\/h2>\n<p>\u3088\u304f\u3042\u308b\u306e\u306f\u300c\u7279\u5b9a\u30e6\u30fc\u30b6\u30fc\u306e\u6700\u65b0\u6ce8\u6587 20 \u4ef6\u300d\u3092\u53d6\u308b\u30af\u30a8\u30ea\u3067\u3059\u3002<\/p>\n<pre class=\"lang:default decode:true\">SELECT *\nFROM orders\nWHERE user_id = 1001\n  AND status = 'paid'\nORDER BY created_at DESC\nLIMIT 20;<\/pre>\n<p>\u30c7\u30fc\u30bf\u304c\u5897\u3048\u308b\u3068\u3001\u3053\u308c\u304c\u6570\u767e\u30df\u30ea\u79d2\u301c\u6570\u79d2\u304b\u304b\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>\u539f\u56e0 \u2014 EXPLAIN \u3067\u8aad\u3080<\/h2>\n<h3>MySQL \u306e\u4e3b\u8981\u30ab\u30e9\u30e0<\/h3>\n<pre class=\"lang:default decode:true\">EXPLAIN\nSELECT * FROM orders\nWHERE user_id = 1001 AND status = 'paid'\nORDER BY created_at DESC LIMIT 20;<\/pre>\n<p>\u307e\u305a\u898b\u308b\u3079\u304d\u306f\u6b21\u306e 4 \u3064\u3067\u3059\u3002<\/p>\n<table>\n<thead>\n<tr>\n<th>\u30ab\u30e9\u30e0<\/th>\n<th>\u610f\u5473<\/th>\n<th>\u5371\u967a\u30b5\u30a4\u30f3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><code>type<\/code><\/td>\n<td>\u30a2\u30af\u30bb\u30b9\u65b9\u5f0f<\/td>\n<td><code>ALL<\/code>\uff08\u30d5\u30eb\u30b9\u30ad\u30e3\u30f3\uff09<\/td>\n<\/tr>\n<tr>\n<td><code>key<\/code><\/td>\n<td>\u4f7f\u308f\u308c\u305f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9<\/td>\n<td><code>NULL<\/code><\/td>\n<\/tr>\n<tr>\n<td><code>rows<\/code><\/td>\n<td>\u8d70\u67fb\u898b\u8fbc\u307f\u884c\u6570<\/td>\n<td>\u8fd4\u3059\u4ef6\u6570\u3088\u308a\u6841\u9055\u3044\u306b\u5927\u304d\u3044<\/td>\n<\/tr>\n<tr>\n<td><code>Extra<\/code><\/td>\n<td>\u88dc\u8db3\u60c5\u5831<\/td>\n<td><code>Using filesort<\/code> \/ <code>Using temporary<\/code><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u60aa\u3044\u51fa\u529b\u306e\u4f8b:<\/p>\n<pre class=\"lang:default decode:true\">type: ALL\nkey:  NULL\nrows: 480000\nExtra: Using where; Using filesort<\/pre>\n<p><code>type: ALL<\/code> \u3068 <code>key: NULL<\/code> \u306f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u672a\u4f7f\u7528\u306e\u5168\u8d70\u67fb\u3001<code>Using filesort<\/code> \u306f\u30bd\u30fc\u30c8\u51e6\u7406\u306e\u767a\u751f\u3092\u610f\u5473\u3057\u307e\u3059\u3002\u6b32\u3057\u3044\u306e\u306f 20 \u4ef6\u306a\u306e\u306b 48 \u4e07\u884c\u3092\u8aad\u3093\u3067\u3044\u307e\u3059\u3002<\/p>\n<p>MySQL 8.0.18 \u4ee5\u964d\u306f <code>EXPLAIN ANALYZE<\/code> \u3067\u5b9f\u6e2c\u5024\u304c\u53d6\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"lang:default decode:true\">EXPLAIN ANALYZE\nSELECT * FROM orders\nWHERE user_id = 1001 AND status = 'paid'\nORDER BY created_at DESC LIMIT 20;<\/pre>\n<pre class=\"lang:default decode:true\">-&gt; Limit: 20 row(s)  (actual time=312..312 rows=20 loops=1)\n    -&gt; Sort: orders.created_at DESC  (actual time=312..312 ...)\n        -&gt; Filter: ...  (actual time=0.1..290 rows=1800 loops=1)\n            -&gt; Table scan on orders  (rows=480000)<\/pre>\n<h3>PostgreSQL \u306e\u8aad\u307f\u65b9<\/h3>\n<p>PostgreSQL \u306f\u6700\u521d\u304b\u3089 <code>EXPLAIN (ANALYZE, BUFFERS)<\/code> \u304c\u5b9a\u77f3\u3067\u3059\u3002<\/p>\n<pre class=\"lang:default decode:true\">EXPLAIN (ANALYZE, BUFFERS)\nSELECT * FROM orders\nWHERE user_id = 1001 AND status = 'paid'\nORDER BY created_at DESC LIMIT 20;<\/pre>\n<pre class=\"lang:default decode:true\">Limit  (actual time=305.1..305.2 rows=20 loops=1)\n  -&gt;  Sort  (actual time=305.1..305.1 rows=20 loops=1)\n        Sort Method: top-N heapsort  Memory: 30kB\n        -&gt;  Seq Scan on orders\n              (actual time=0.2..280.4 rows=1800 loops=1)\n              Filter: ((user_id = 1001) AND (status = 'paid'))\n              Rows Removed by Filter: 478200\nExecution Time: 305.4 ms<\/pre>\n<p>\u8aad\u307f\u65b9\u306e\u30b3\u30c4:<\/p>\n<ul>\n<li>\u30ce\u30fc\u30c9\u306f <strong>\u5185\u5074\uff08\u4e0b\uff09\u304b\u3089\u5916\u5074\uff08\u4e0a\uff09<\/strong> \u306b\u5b9f\u884c\u3055\u308c\u308b\u3002\u4e00\u756a\u5185\u5074\u306e\u91cd\u3044\u30ce\u30fc\u30c9\u304c\u5f8b\u901f<\/li>\n<li><code>Rows Removed by Filter<\/code> \u304c\u5927\u304d\u3044 = \u30e0\u30c0\u306b\u8aad\u3093\u3067\u3044\u308b<\/li>\n<li>\u898b\u7a4d\u308a <code>rows<\/code> \u3068 <code>actual rows<\/code> \u304c\u4e56\u96e2\u3057\u3066\u3044\u305f\u3089 <strong>\u7d71\u8a08\u60c5\u5831\u304c\u53e4\u3044<\/strong>\u53ef\u80fd\u6027 \u2192 <code>ANALYZE<\/code> \u3067\u66f4\u65b0<\/li>\n<\/ul>\n<h2>\u5bfe\u5fdc\u65b9\u6cd5<\/h2>\n<h3>1. \u8907\u5408\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u300c\u7b49\u5024 \u2192 \u30bd\u30fc\u30c8\u300d\u9806\u3067\u5f35\u308b<\/h3>\n<p>\u6761\u4ef6\u306f\u300c<code>user_id<\/code>, <code>status<\/code> \u3067\u7b49\u5024\u7d5e\u308a\u8fbc\u307f \u2192 <code>created_at<\/code> \u3067\u30bd\u30fc\u30c8\u300d\u3067\u3059\u3002\u8907\u5408\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u5217\u9806\u306f <strong>\u7b49\u5024\u6761\u4ef6\u3092\u5148\u306b\u3001\u30bd\u30fc\u30c8\/\u7bc4\u56f2\u3092\u5f8c\u306b<\/strong> \u304c\u539f\u5247\u3067\u3059\u3002<\/p>\n<pre class=\"lang:default decode:true\">CREATE INDEX idx_orders_user_status_created\n  ON orders (user_id, status, created_at);<\/pre>\n<p>\u3053\u306e\u9806\u5e8f\u306a\u3089 <code>(user_id, status)<\/code> \u3067\u7bc4\u56f2\u3092\u7279\u5b9a\u3067\u304d\u3001\u305d\u306e\u7bc4\u56f2\u5185\u306f\u3059\u3067\u306b <code>created_at<\/code> \u9806\u306b\u4e26\u3076\u305f\u3081\u3001\u30bd\u30fc\u30c8\u81ea\u4f53\u3092\u7701\u7565\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>2. \u6539\u5584\u5f8c\u3092 EXPLAIN \u3067\u78ba\u8a8d<\/h3>\n<p>MySQL:<\/p>\n<pre class=\"lang:default decode:true\">type: range\nkey:  idx_orders_user_status_created\nrows: 1800\nExtra: Using index condition<\/pre>\n<p>PostgreSQL:<\/p>\n<pre class=\"lang:default decode:true\">Limit  (actual time=0.05..0.12 rows=20 loops=1)\n  -&gt;  Index Scan using idx_orders_user_status_created on orders\n        Index Cond: ((user_id = 1001) AND (status = 'paid'))\nExecution Time: 0.2 ms<\/pre>\n<p><code>Seq Scan \u2192 Index Scan<\/code>\u3001<code>Sort<\/code> \u30ce\u30fc\u30c9\u6d88\u6ec5\u3002305ms \u304c 0.2ms \u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<h2>\u5b9f\u88c5\u4f8b \u2014 \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u52b9\u304b\u306a\u304f\u306a\u308b\u5178\u578b\u30d1\u30bf\u30fc\u30f3<\/h2>\n<pre class=\"lang:default decode:true\">-- \u274c \u5217\u306b\u95a2\u6570 \u2192 \u52b9\u304b\u306a\u3044\nWHERE DATE(created_at) = '2026-10-17'\n-- \u2b55 \u7bc4\u56f2\u6761\u4ef6\u306b\nWHERE created_at &gt;= '2026-10-17 00:00:00'\n  AND created_at &lt;  '2026-10-18 00:00:00'<\/pre>\n<pre class=\"lang:default decode:true\">-- \u274c \u4e2d\u9593\u4e00\u81f4 LIKE \u2192 \u52b9\u304b\u306a\u3044\nWHERE name LIKE '%\u7530\u4e2d%'\n-- \u2b55 \u524d\u65b9\u4e00\u81f4\nWHERE name LIKE '\u7530\u4e2d%'<\/pre>\n<pre class=\"lang:default decode:true\">-- \u274c \u6697\u9ed9\u306e\u578b\u5909\u63db\uff08VARCHAR \u30ab\u30e9\u30e0\u306b\u6570\u5024\uff09\nWHERE phone = 09012345678\n-- \u2b55 \u578b\u3092\u5408\u308f\u305b\u308b\nWHERE phone = '09012345678'<\/pre>\n<h2>\u78ba\u8a8d\u65b9\u6cd5<\/h2>\n<ol>\n<li><code>EXPLAIN ANALYZE<\/code>\uff08MySQL 8.0.18+\uff09\/ <code>EXPLAIN (ANALYZE, BUFFERS)<\/code>\uff08PostgreSQL\uff09\u3067 Execution Time \u3092\u6539\u5584\u524d\u5f8c\u3067\u6bd4\u8f03<\/li>\n<li>\u30a2\u30af\u30bb\u30b9\u65b9\u5f0f\uff08<code>type<\/code> \/ <code>Index Scan<\/code>\uff09\u304c\u5909\u308f\u3063\u305f\u304b\u78ba\u8a8d<\/li>\n<li><code>Using filesort<\/code> \/ <code>Sort<\/code> \u30ce\u30fc\u30c9\u304c\u6d88\u3048\u305f\u304b\u78ba\u8a8d<\/li>\n<li>\u672c\u756a\u76f8\u5f53\u306e\u30c7\u30fc\u30bf\u91cf\u3067\u78ba\u8a8d<\/li>\n<\/ol>\n<h2>\u6ce8\u610f\u70b9<\/h2>\n<ul>\n<li>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f\u66f8\u304d\u8fbc\u307f\u30b3\u30b9\u30c8\u3068\u30b9\u30c8\u30ec\u30fc\u30b8\u3092\u6d88\u8cbb\u3059\u308b\u3002\u4f7f\u308f\u308c\u306a\u3044\u3082\u306e\u306f\u524a\u9664\u5019\u88dc<\/li>\n<li>\u898b\u7a4d\u308a\u304c\u304a\u304b\u3057\u3044\u3068\u304d\u306f\u7d71\u8a08\u66f4\u65b0\uff08MySQL <code>ANALYZE TABLE<\/code> \/ PostgreSQL <code>ANALYZE<\/code>\uff09\u3092\u5148\u306b<\/li>\n<li><code>EXPLAIN ANALYZE<\/code> \u306f <strong>\u5b9f\u969b\u306b\u30af\u30a8\u30ea\u3092\u5b9f\u884c\u3059\u308b<\/strong>\u3002<code>UPDATE<\/code>\/<code>DELETE<\/code> \u3067\u306f\u672c\u5f53\u306b\u66f4\u65b0\u304c\u8d70\u308b\u305f\u3081\u672c\u756a\u3067\u306f\u8981\u6ce8\u610f\uff08\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u3067\u56f2\u307f\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u3059\u308b\u7b49\uff09<\/li>\n<li>\u8907\u5408\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u5217\u9806\u306f\u300c\u7b49\u5024 \u2192 \u7bc4\u56f2\/\u30bd\u30fc\u30c8\u300d\u304c\u57fa\u672c<\/li>\n<\/ul>\n<h2>\u307e\u3068\u3081<\/h2>\n<ul>\n<li>\u898b\u7a4d\u308a\u3067\u306f\u306a\u304f <code>EXPLAIN ANALYZE<\/code> \u306e\u5b9f\u6e2c\u3092\u898b\u308b<\/li>\n<li>MySQL \u306f <code>type\/key\/rows\/Extra<\/code>\u3001PostgreSQL \u306f <code>Seq Scan \/ Rows Removed \/ \u898b\u7a4d\u308a\u3068\u306e\u30ba\u30ec<\/code> \u306b\u6ce8\u76ee<\/li>\n<li>\u7b2c\u4e00\u624b\u306f\u591a\u304f\u306e\u5834\u5408\u300c\u7b49\u5024 \u2192 \u30bd\u30fc\u30c8\u300d\u9806\u306e\u8907\u5408\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3002<code>filesort<\/code>\/<code>Sort<\/code> \u304c\u6d88\u3048\u308c\u3070\u6210\u529f<\/li>\n<li>\u5fc5\u305a\u672c\u756a\u76f8\u5f53\u306e\u30c7\u30fc\u30bf\u91cf\u3067\u3001\u6539\u5584\u524d\u5f8c\u306e\u6570\u5024\u3092\u6bd4\u8f03\u3057\u3066\u88cf\u3092\u53d6\u308b<\/li>\n<\/ul>\n<p>EXPLAIN \u306f\u300c\u9045\u3044\u300d\u3092\u300c\u3069\u3053\u304c\u3069\u3046\u9045\u3044\u300d\u306b\u7ffb\u8a33\u3059\u308b\u9053\u5177\u3067\u3059\u3002\u8aad\u3081\u308b\u3088\u3046\u306b\u306a\u308b\u3068\u3001\u5f53\u3066\u63a8\u91cf\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u8ffd\u52a0\u304c\u3001\u6839\u62e0\u306e\u3042\u308b\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u306b\u5909\u308f\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u300c\u4e00\u89a7\u753b\u9762\u304c\u91cd\u3044\u300d\u300c\u591c\u9593\u30d0\u30c3\u30c1\u304c\u7d42\u308f\u3089\u306a\u3044\u300d\u3002\u3053\u306e\u7a2e\u306e\u76f8\u8ac7\u306e\u591a\u304f\u306f\u3001\u7279\u5b9a\u306e SQL \u304c\u60f3\u5b9a\u5916\u306e\u30a2\u30af\u30bb\u30b9\u7d4c\u8def\uff08\u5b9f\u884c\u8a08\u753b\uff09\u3067\u52d5\u3044\u3066\u3044\u308b\u3053\u3068\u304c\u539f\u56e0\u3067\u3059\u3002\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u8ffd\u52a0\u3059\u308c\u3070\u76f4\u308b\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u304c\u3001\u307e\u305a\u5fc5\u8981\u306a\u306e\u306f\u300cDB 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