{"id":16333,"date":"2024-09-11T15:48:33","date_gmt":"2024-09-11T07:48:33","guid":{"rendered":"https:\/\/92it.top\/?p=16333"},"modified":"2024-09-11T15:48:33","modified_gmt":"2024-09-11T07:48:33","slug":"mysql-explain%e6%89%a7%e8%a1%8c%e8%ae%a1%e5%88%92%ef%bc%8c%e5%a6%82%e4%bd%95%e5%88%86%e6%9e%90%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/92it.top\/?p=16333","title":{"rendered":"MySQL EXPLAIN\u6267\u884c\u8ba1\u5212\uff0c\u5982\u4f55\u5206\u6790\uff1f"},"content":{"rendered":"\n

\u8f6c\u8f7d\uff1aMySQL EXPLAIN\u6267\u884c\u8ba1\u5212\uff0c\u5982\u4f55\u5206\u6790\uff1f<\/a><\/p>\n\n\n\n

\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u5982\u679c\u9009\u62e9\u7684\u662f MySQL \u6570\u636e\u5e93\uff0c\u901a\u5e38\u4f1a\u4f7f\u7528EXPLAIN<\/code>\u5173\u952e\u5b57\u6765\u663e\u793a\u67e5\u8be2 SQL \u7684\u6267\u884c\u8ba1\u5212\uff0c\u4ece\u800c\u5e2e\u52a9\u6211\u4eec\u4f18\u5316\u67e5\u8be2\u6027\u80fd\u3002\u90a3\u4e48\uff0cEXPLAIN<\/code>\u662f\u5982\u4f55\u5de5\u4f5c\u7684\uff1fEXPLAIN<\/code>\u7ed3\u679c\u91cc\u9762\u7684\u5b57\u6bb5\u8be5\u5982\u4f55\u7406\u89e3\uff0c\u8fd9\u7bc7\u6587\u7ae0\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u5206\u6790\u3002<\/p>\n\n\n\n

\u5b57\u6bb5\u89e3\u6790<\/strong><\/p>\n\n\n\n

\n\n\n\n

\u5f53\u6211\u4eec\u5bf9\u4e00\u4e2a\u67e5\u8be2\u8bed\u53e5\u6267\u884cEXPLAIN<\/code>\u65f6\uff0cEXPLAIN<\/code>\u901a\u5e38\u4f1a\u8fd4\u56de\u4ee5\u4e0b\u5b57\u6bb5\uff0c\u4e0b\u9762\u6211\u4eec\u5c06\u5bf9\u5404\u4e2a\u5217\u7684\u542b\u4e49\u53ca\u5176\u793a\u4f8b\u8fdb\u884c\u8bf4\u660e\u3002<\/p>\n\n\n\n

id<\/th>select_type<\/th>table<\/th>partitions<\/th>type<\/th>possible_keys<\/th>key<\/th>key_len<\/th>ref<\/th>rows<\/th>filtered<\/th>Extra<\/th><\/tr><\/thead>
1<\/td>SIMPLE<\/td>users<\/td>NULL<\/td>ALL<\/td>NULL<\/td>NULL<\/td>NULL<\/td>NULL<\/td>1000<\/td>10.00<\/td>Using where<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

1. id<\/strong><\/p>\n\n\n\n

id<\/code>\u8868\u793a\u67e5\u8be2\u7684\u6807\u8bc6\u7b26\u3002\u5982\u679c\u4e00\u4e2a\u67e5\u8be2\u5305\u542b\u5b50\u67e5\u8be2\u6216\u8054\u5408\u67e5\u8be2\uff0c\u6bcf\u4e2a\u5b50\u67e5\u8be2\u6216\u8054\u5408\u67e5\u8be2\u90fd\u4f1a\u6709\u4e00\u4e2a\u552f\u4e00\u7684 id\u3002\u6bd4\u5982\uff1a1<\/code><\/p>\n\n\n\n

2. select_type<\/strong><\/p>\n\n\n\n

select_type<\/code>\u8868\u793a\u67e5\u8be2\u7684\u7c7b\u578b\uff0c\u8868\u793a\u67e5\u8be2\u662f\u7b80\u5355\u67e5\u8be2\u3001\u8054\u5408\u67e5\u8be2\u3001\u5b50\u67e5\u8be2\u7b49\u3002<\/p>\n\n\n\n

\u5e38\u89c1\u503c\uff1a<\/p>\n\n\n\n

    \n
  • SIMPLE<\/code>: \u7b80\u5355\u67e5\u8be2\uff0c\u4e0d\u5305\u542b\u5b50\u67e5\u8be2\u6216\u8054\u5408\u67e5\u8be2\u3002<\/li>\n\n\n\n
  • PRIMARY<\/code>: \u6700\u5916\u5c42\u67e5\u8be2\u3002<\/li>\n\n\n\n
  • SUBQUERY<\/code>: \u5b50\u67e5\u8be2\u4e2d\u7684\u7b2c\u4e00\u4e2a SELECT\u3002<\/li>\n\n\n\n
  • DERIVED<\/code>: \u6d3e\u751f\u8868\uff08\u5b50\u67e5\u8be2\u4e2d\u7684 FROM \u5b50\u53e5\uff09\u3002<\/li>\n<\/ul>\n\n\n\n

    \u6bd4\u5982\uff1aSIMPLE<\/code><\/p>\n\n\n\n

    3. table<\/strong><\/p>\n\n\n\n

    table<\/code>\u4ee3\u8868\u4e86\u67e5\u8be2\u6d89\u53ca\u7684\u8868\u540d\u6216\u522b\u540d\u3002<\/p>\n\n\n\n

    \u6bd4\u5982\uff1ausers<\/code><\/p>\n\n\n\n

    4. partitions<\/strong><\/p>\n\n\n\n

    partitions<\/code>\u4ee3\u8868\u67e5\u8be2\u6d89\u53ca\u7684\u5206\u533a\uff08\u5982\u679c\u6709\uff09\u3002\u6bd4\u5982\uff1aNULL<\/code><\/p>\n\n\n\n

    5. type<\/strong><\/p>\n\n\n\n

    type<\/code>\u8868\u793a\u8fde\u63a5\u7c7b\u578b\uff0c\u53cd\u6620\u4e86 MySQL \u5982\u4f55\u67e5\u627e\u8868\u4e2d\u7684\u884c\u3002<\/p>\n\n\n\n

    \u5e38\u89c1\u503c\uff08\u6309\u6548\u7387\u4ece\u9ad8\u5230\u4f4e\u6392\u5e8f\uff09\uff1a<\/p>\n\n\n\n

      \n
    • system<\/code>: \u8868\u53ea\u6709\u4e00\u884c\uff08\u7b49\u540c\u4e8e\u7cfb\u7edf\u8868\uff09\u3002<\/li>\n\n\n\n
    • const<\/code>: \u8868\u6700\u591a\u6709\u4e00\u4e2a\u5339\u914d\u884c\uff08\u4e3b\u952e\u6216\u552f\u4e00\u7d22\u5f15\uff09\u3002<\/li>\n\n\n\n
    • eq_ref<\/code>: \u5bf9\u4e8e\u6bcf\u4e2a\u6765\u81ea\u524d\u8868\u7684\u884c\u7ec4\u5408\uff0c\u4ece\u8be5\u8868\u8bfb\u53d6\u4e00\u884c\u3002<\/li>\n\n\n\n
    • ref<\/code>: \u5bf9\u4e8e\u6bcf\u4e2a\u6765\u81ea\u524d\u8868\u7684\u884c\u7ec4\u5408\uff0c\u4ece\u8be5\u8868\u8bfb\u53d6\u6240\u6709\u5339\u914d\u884c\u3002<\/li>\n\n\n\n
    • range<\/code>: \u53ea\u68c0\u7d22\u7ed9\u5b9a\u8303\u56f4\u7684\u884c\uff0c\u4f7f\u7528\u7d22\u5f15\u6765\u9009\u62e9\u884c\u3002<\/li>\n\n\n\n
    • index<\/code>: \u5168\u7d22\u5f15\u626b\u63cf\u3002<\/li>\n\n\n\n
    • ALL<\/code>: \u5168\u8868\u626b\u63cf\u3002<\/li>\n<\/ul>\n\n\n\n

      \u6bd4\u5982\uff1aref<\/code><\/p>\n\n\n\n

      6. possible_keys<\/strong>possible_keys<\/code>\u8868\u793a MySQL \u8ba4\u4e3a\u53ef\u4ee5\u4f7f\u7528\u7684\u7d22\u5f15\u3002\u6bd4\u5982\uff1aPRIMARY<\/code><\/p>\n\n\n\n

      7. key<\/strong>key<\/code>\u8868\u793a\u5b9e\u9645\u4f7f\u7528\u7684\u7d22\u5f15\u3002\u6bd4\u5982\uff1aPRIMARY<\/code><\/p>\n\n\n\n

      8. key_len<\/strong>key_len<\/code>\u8868\u793a\u4f7f\u7528\u7684\u7d22\u5f15\u7684\u957f\u5ea6\u3002\u6bd4\u5982\uff1a4<\/code><\/p>\n\n\n\n

      9. ref<\/strong>ref<\/code>\u663e\u793a\u4f7f\u7528\u54ea\u4e2a\u5217\u6216\u5e38\u6570\u4e0e key \u4e00\u8d77\u4ece\u8868\u4e2d\u9009\u62e9\u884c\u3002\u6bd4\u5982\uff1aconst<\/code><\/p>\n\n\n\n

      10. rows<\/strong>rows<\/code>\u8868\u793a MySQL \u4f30\u8ba1\u8981\u626b\u63cf\u7684\u884c\u6570\u3002\u6bd4\u5982\uff1a1<\/code><\/p>\n\n\n\n

      11. filtered<\/strong><\/p>\n\n\n\n

      filtered<\/code>\u8868\u793a\u8fd4\u56de\u7ed3\u679c\u7684\u884c\u5360\u603b\u884c\u6570\u7684\u767e\u5206\u6bd4\u3002\u6bd4\u5982\uff1a100.00<\/code><\/p>\n\n\n\n

      12. Extra<\/strong>Extra<\/code>\u8868\u793a\u989d\u5916\u7684\u4fe1\u606f\uff0c\u63cf\u8ff0\u67e5\u8be2\u6267\u884c\u8fc7\u7a0b\u4e2d\u4e00\u4e9b\u7279\u5b9a\u7684\u64cd\u4f5c\u3002<\/p>\n\n\n\n

      \u5e38\u89c1\u503c\uff1a<\/p>\n\n\n\n

        \n
      • Using index<\/code>: \u4f7f\u7528\u8986\u76d6\u7d22\u5f15\uff08\u53ea\u4ece\u7d22\u5f15\u4e2d\u8bfb\u53d6\u4fe1\u606f\uff0c\u800c\u4e0d\u662f\u4ece\u5b9e\u9645\u8868\u4e2d\u8bfb\u53d6\uff09\u3002<\/li>\n\n\n\n
      • Using where<\/code>: \u4f7f\u7528 WHERE \u5b50\u53e5\u8fc7\u6ee4\u884c\u3002<\/li>\n\n\n\n
      • Using temporary<\/code>: \u4f7f\u7528\u4e34\u65f6\u8868\u4fdd\u5b58\u4e2d\u95f4\u7ed3\u679c\u3002<\/li>\n\n\n\n
      • Using filesort<\/code>: \u9700\u8981\u989d\u5916\u7684\u6392\u5e8f\u64cd\u4f5c\uff08\u6587\u4ef6\u6392\u5e8f\uff09\u3002<\/li>\n<\/ul>\n\n\n\n

        \u6bd4\u5982\uff1aUsing where<\/code><\/p>\n\n\n\n

        \u793a\u4f8b<\/strong><\/p>\n\n\n\n

        \n\n\n\n

        \u4e3a\u4e86\u66f4\u597d\u7684\u89e3\u91ca\uff0c\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u793a\u4f8b\u8bf4\u660e\uff0c\u5047\u8bbe\u6709\u4e00\u4e2a\u7b80\u5355\u7684\u8868 users<\/code>\uff0c\u7ed3\u6784\u5982\u4e0b\uff1a<\/p>\n\n\n\n

        CREATE TABLE users (\n    id INT PRIMARY KEY,\n    name VARCHAR(100),\n    age INT,\n    city VARCHAR(100)\n);<\/pre>\n\n\n\n
        \u6267\u884c\u4e00\u4e2a\u67e5\u8be2\uff1a<\/p>\n\n\n\n
        EXPLAIN SELECT * FROM users WHERE age > 25;<\/pre>\n\n\n\n
        \u53ef\u80fd\u5f97\u5230\u7684\u8f93\u51fa\u5982\u4e0b\uff1a<\/p>\n\n\n\n
        id<\/th>select_type<\/th>table<\/th>partitions<\/th>type<\/th>possible_keys<\/th>key<\/th>key_len<\/th>ref<\/th>rows<\/th>filtered<\/th>Extra<\/th><\/tr><\/thead>
        1<\/td>SIMPLE<\/td>users<\/td>NULL<\/td>ALL<\/td>NULL<\/td>NULL<\/td>NULL<\/td>NULL<\/td>1000<\/td>10.00<\/td>Using where<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
        \u89e3\u91ca\uff1a<\/p>\n\n\n\n
          \n
        • id<\/code>: \u67e5\u8be2\u7684\u6807\u8bc6\u7b26\uff0c\u53ea\u6709\u4e00\u4e2a\u7b80\u5355\u67e5\u8be2\uff0c\u6240\u4ee5 id \u662f 1\u3002<\/li>\n\n\n\n
        • select_type<\/code>: \u67e5\u8be2\u7c7b\u578b\uff0c\u8fd9\u91cc\u662f SIMPLE<\/code>\uff0c\u8868\u793a\u7b80\u5355\u67e5\u8be2\u3002<\/li>\n\n\n\n
        • table<\/code>: \u67e5\u8be2\u6d89\u53ca\u7684\u8868\uff0c\u8fd9\u91cc\u662f users<\/code>\u3002<\/li>\n\n\n\n
        • partitions<\/code>: \u6ca1\u6709\u4f7f\u7528\u5206\u533a\uff0c\u6240\u4ee5\u662f NULL<\/code>\u3002<\/li>\n\n\n\n
        • type<\/code>: \u8fde\u63a5\u7c7b\u578b\uff0c\u8fd9\u91cc\u662f ALL<\/code>\uff0c\u8868\u793a\u5168\u8868\u626b\u63cf\u3002<\/li>\n\n\n\n
        • possible_keys<\/code>: \u53ef\u80fd\u4f7f\u7528\u7684\u7d22\u5f15\uff0c\u8fd9\u91cc\u6ca1\u6709\u7d22\u5f15\u53ef\u4ee5\u4f7f\u7528\u3002<\/li>\n\n\n\n
        • key<\/code>: \u5b9e\u9645\u4f7f\u7528\u7684\u7d22\u5f15\uff0c\u8fd9\u91cc\u6ca1\u6709\u4f7f\u7528\u7d22\u5f15\uff0c\u6240\u4ee5\u662f NULL<\/code>\u3002<\/li>\n\n\n\n
        • key_len<\/code>: \u7d22\u5f15\u957f\u5ea6\uff0c\u8fd9\u91cc\u6ca1\u6709\u4f7f\u7528\u7d22\u5f15\uff0c\u6240\u4ee5\u662f NULL<\/code>\u3002<\/li>\n\n\n\n
        • ref<\/code>: \u5f15\u7528\u7684\u5217\u6216\u5e38\u6570\uff0c\u8fd9\u91cc\u6ca1\u6709\u4f7f\u7528\u7d22\u5f15\uff0c\u6240\u4ee5\u662f NULL<\/code>\u3002<\/li>\n\n\n\n
        • rows<\/code>: \u4f30\u8ba1\u8981\u626b\u63cf\u7684\u884c\u6570\uff0c\u8fd9\u91cc\u4f30\u8ba1\u8981\u626b\u63cf 1000 \u884c\u3002<\/li>\n\n\n\n
        • filtered<\/code>: \u8fc7\u6ee4\u767e\u5206\u6bd4\uff0c\u8fd9\u91cc\u662f 10%\uff0c\u8868\u793a\u5927\u7ea6 10% \u7684\u884c\u6ee1\u8db3 WHERE<\/code> \u6761\u4ef6\u3002<\/li>\n\n\n\n
        • Extra<\/code>: \u989d\u5916\u4fe1\u606f\uff0c\u8fd9\u91cc\u662f Using where<\/code>\uff0c\u8868\u793a\u4f7f\u7528\u4e86 WHERE<\/code> \u5b50\u53e5\u8fdb\u884c\u8fc7\u6ee4\u3002<\/li>\n<\/ul>\n\n\n\n
          \u901a\u8fc7EXPLAIN<\/code>\u7684\u7ed3\u679c\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u67e5\u8be2\u7684\u6267\u884c\u8ba1\u5212\uff0c\u5e76\u636e\u6b64\u4f18\u5316\u67e5\u8be2\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u8003\u8651\u5728 age<\/code> \u5217\u4e0a\u6dfb\u52a0\u7d22\u5f15\u4ee5\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u3002<\/p>\n\n\n\n
          \u4f18\u5316\u5efa\u8bae<\/strong><\/p>\n\n\n\n
          \n\n\n\n
          \u6839\u636eEXPLAIN<\/code>\u7684\u8f93\u51fa\uff0c\u53ef\u4ee5\u91c7\u53d6\u4ee5\u4e0b\u4f18\u5316\u63aa\u65bd\uff1a<\/p>\n\n\n\n
          1. \u4f7f\u7528\u5408\u9002\u7684\u7d22\u5f15<\/strong>\u786e\u4fdd\u5728\u67e5\u8be2\u4e2d\u4f7f\u7528\u7684\u5217\u4e0a\u5efa\u7acb\u7d22\u5f15\u3002\u4f8b\u5982\uff0c\u5bf9\u4e8e WHERE \u5b50\u53e5\u4e2d\u7684\u5217\u3001JOIN \u5b50\u53e5\u4e2d\u7684\u8fde\u63a5\u5217\u3001ORDER BY \u548c GROUP BY \u5b50\u53e5\u4e2d\u7684\u5217\uff0c\u90fd\u5e94\u8003\u8651\u5efa\u7acb\u7d22\u5f15\u3002<\/p>\n\n\n\n
          2. \u907f\u514d\u5168\u8868\u626b\u63cf\uff1a<\/strong>\u5982\u679c type \u5217\u663e\u793a\u4e3a ALL\uff0c\u8868\u793a\u5168\u8868\u626b\u63cf\u3002\u5e94\u8be5\u8003\u8651\u6dfb\u52a0\u7d22\u5f15\u4ee5\u907f\u514d\u5168\u8868\u626b\u63cf\u3002<\/p>\n\n\n\n
          3. \u4f18\u5316\u8fde\u63a5\u987a\u5e8f\uff1a<\/strong>\u5bf9\u4e8e\u591a\u8868\u8fde\u63a5\uff0c\u4f18\u5316\u5668\u4f1a\u9009\u62e9\u6700\u4f18\u7684\u8fde\u63a5\u987a\u5e8f\u3002\u53ef\u4ee5\u901a\u8fc7EXPLAIN<\/code>\u67e5\u770b\u8fde\u63a5\u987a\u5e8f\uff0c\u5e76\u8c03\u6574\u67e5\u8be2\u4ee5\u4f18\u5316\u8fde\u63a5\u987a\u5e8f\u3002<\/p>\n\n\n\n
          4. \u4f7f\u7528\u8986\u76d6\u7d22\u5f15<\/strong>\u5982\u679cExtra<\/code>\u5217\u663e\u793a\u4e3aUsing index<\/code>\uff0c\u8868\u793a\u67e5\u8be2\u53ea\u4ece\u7d22\u5f15\u4e2d\u8bfb\u53d6\u6570\u636e\uff0c\u800c\u4e0d\u9700\u8981\u8bbf\u95ee\u5b9e\u9645\u8868\u3002\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u5408\u9002\u7684\u7d22\u5f15\u6765\u5b9e\u73b0\u8986\u76d6\u7d22\u5f15\u3002<\/p>\n\n\n\n
          5. \u51cf\u5c11\u8fd4\u56de\u7684\u884c\u6570<\/strong>\u4f7f\u7528LIMIT<\/code>\u5b50\u53e5\u9650\u5236\u8fd4\u56de\u7684\u884c\u6570\uff0c\u51cf\u5c11\u626b\u63cf\u7684\u884c\u6570\u3002<\/p>\n\n\n\n
          6. \u907f\u514d\u4f7f\u7528 SELECT<\/strong>\u5c3d\u91cf\u907f\u514d\u4f7f\u7528SELECT *<\/code>\uff0c\u53ea\u9009\u62e9\u9700\u8981\u7684\u5217\u4ee5\u51cf\u5c11\u6570\u636e\u4f20\u8f93\u91cf\u3002<\/p>\n\n\n\n
          7. \u4f18\u5316\u5b50\u67e5\u8be2<\/strong>\u5bf9\u4e8e\u5b50\u67e5\u8be2\uff0c\u53ef\u4ee5\u8003\u8651\u4f7f\u7528JOIN<\/code>\u6216\u6d3e\u751f\u8868\u6765\u66ff\u4ee3\uff0c\u51cf\u5c11\u67e5\u8be2\u7684\u590d\u6742\u5ea6\u3002<\/p>\n\n\n\n
          \u603b\u7ed3<\/strong><\/p>\n\n\n\n
          \n\n\n\n
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