![\"Po7PFJD\"](\"https://i.imgur.com/Po7PFJD.png\" "\\"Po7PFJD\\"/")
\u80cc\u666f\uff1a\u672c\u4eba\u4e00\u5e74\u5de6\u53f3 java \u5f00\u53d1\u5de5\u4f5c\u7ecf\u9a8c\uff0c\u5728\u4e00\u5bb6\u5c0f\u516c\u53f8\u5e72\u5f00\u53d1\uff0c\u6570\u636e\u5e93\u4f7f\u7528\u7684\u662f MySQL,\u914d\u7f6e\u57fa\u672c\u4e0a\u90fd\u662f\u9ed8\u8ba4\uff0c\u5e94\u7528\u7aef\u6570\u636e\u5e93\u8fde\u63a5\u6c60\u4f7f\u7528\u7684\u662f HikariCP \uff0c\u4e5f\u914d\u7f6e\u4e86\u4e00\u4e9b\u53c2\u6570\uff0c\u6700\u8fd1\u6d4b\u8bd5\u73af\u5883\u9047\u5230\u8fde\u63a5\u6570\u8d85\u7684\u60c5\u51b5\u3002\u5728\u7f51\u4e0a\u67e5\u8be2\u4e86\u4e00\u4e9b\u65b9\u6cd5\u770b\u7740\u6709\u70b9\u8ff7\u3002
\n\u5c1d\u8bd5\u89e3\u51b3\uff1a
\n1 \u3001\u8c03\u6574\u6570\u636e\u5e93\u7684 max_connections\n\n2 \u3001\u7f29\u77ed\u7cfb\u7edf\u8bbe\u7f6e\u7684\u8fde\u63a5\u6570\u7684\u6e05\u9664\u65f6\u95f4\n\n3 \u3001\u6839\u672c\u539f\u56e0\uff1a\u5b58\u5728\u957f\u8fde\u63a5\u3001\u6162 SQL \u7b49\u5360\u7528\u8fde\u63a5\u4e0d\u91ca\u653e\u7684\u60c5\u51b5\n\u7591\u95ee\uff1a\u6ca1\u6709\u8fd9\u65b9\u9762\u7684\u7ecf\u9a8c\uff0c\u8bf7\u6559\u5404\u4f4d\u524d\u8f88\u7b2c\u4e8c\u6761\u6570\u636e\u5e93\u9ed8\u8ba4\u662f 8 \u5c0f\u65f6\uff0c\u662f\u5426\u5efa\u8bae\u8c03\u6574\u5462\uff1f\u6216\u8005\u8fd9\u4e2a\u95ee\u9898\u4f1a\u4e0d\u4f1a\u8fd8\u5b58\u5728\u5176\u4ed6\u7684\u539f\u56e0\u5462\uff1f\u4ee5\u53ca\u5982\u4f55\u6392\u67e5\u5462\uff1f
\n" }, { "author": { "url": "member/supersf", "name": "supersf", "avatar": "https://cdn.v2ex.com/avatar/ca9d/c893/123257_large.png?m=1757588541" }, "url": "t/1158628", "title": "count \u7684\u8bed\u53e5\u4f18\u5316\u95ee\u9898", "id": "t/1158628", "date_published": "2025-09-11T11:02:45+00:00", "content_html": "\u6700\u8fd1\u5728 mysql \u4e2d\u505a\u4e86\u4e00\u4e2a\u67e5\u8be2mysql \u5b89\u88c5\u5728 Linux \u4e0a\uff0c\n\u5728\u4e00\u6b21\u7a81\u7136\u65ad\u7535\u540e\uff0c\u5c40\u57df\u7f51\u5185\u7684\u7684\u5176\u5b83\u673a\u5668\u8fde\u63a5\uff08 jdbc \uff09\u8fd9\u4e2a\u6570\u636e\u5e93\u5c31\u9700\u8981\u5f88\u957f\u65f6\u95f4\u624d\u80fd\u8fde\u63a5\u4e0a\uff0c\u8fde\u4e0a\u4e4b\u540e\u67e5\u8be2\u6570\u636e\u5374\u5f88\u5feb\uff0c\u8fd9\u53ef\u80fd\u662f\u54ea\u7684\u539f\u56e0\uff1f
\n" }, { "author": { "url": "member/Alucns", "name": "Alucns", "avatar": "https://cdn.v2ex.com/avatar/2fd8/8827/31303_large.png?m=1749109527" }, "url": "t/1155131", "title": "MYSQL UPDATE \u5728\u5f88\u77ed\u7684\u65f6\u95f4\u5185\u66f4\u65b0\u76f8\u540c\u7684\u8bed\u53e5\uff0c\u5c31\u4f1a\u6709\u544a\u8b66\uff0c\u5bfc\u81f3\u4e8b\u52a1\u5931\u8d25\uff0c\u6709\u6ca1\u6709\u4eba\u9047\u5230\u8fd9\u95ee\u9898\uff1f", "id": "t/1155131", "date_published": "2025-08-26T14:26:07+00:00", "content_html": "MYSQL UPDATE \u5728\u5f88\u77ed\u7684\u65f6\u95f4\u5185\u66f4\u65b0\u76f8\u540c\u7684\u8bed\u53e5\uff0c\u5c31\u4f1a\u6709\u544a\u8b66\uff0c\u5bfc\u81f3\u4e8b\u52a1\u5931\u8d25\uff0c\u6709\u6ca1\u6709\u4eba\u9047\u5230\u8fd9\u95ee\u9898\uff1fMySQL \u662f\u8dd1\u5728 Docker \u4e0a\uff0c\u5728\u67d0\u6bb5\u65f6\u95f4\u5185 MySQL \u78c1\u76d8\u8bfb\u53d6\u98d9\u5347\uff0c\u5bfc\u81f4\u670d\u52a1\u5668\u5361\u6b7b\u3002
\n\u8fd9\u662f\u56e0\u4e3a\u67e5\u8be2\u626b\u63cf\u884c\u6570\u8fc7\u591a\u5bfc\u81f4\u7684\u78c1\u76d8\u8bfb\u53d6\u98d9\u5347\u5417\uff1f\u8fd8\u662f\u6709\u5176\u4ed6\u539f\u56e0\u3002
\n\u78c1\u76d8\u8bfb\u53d6\u98d9\u5347\u7684\u95ee\u9898\u8be5\u5982\u4f55\u5f97\u5230\u89e3\u51b3\uff1f\u4f18\u5316\u67e5\u8be2 SQL \uff1f\u6362\u963f\u91cc\u4e91\u7684 RDS \uff1f
\n\u6709\u5927\u4f6c\u80fd\u89e3\u7b54\u4e0b\u5417\uff1f
\n\u5b9e\u4f8b\u89c4\u683c\uff1aecs.c8i.xlarge
\nCPU\uff1a4 \u6838 vCPU
\n\u5185\u5b58\uff1a8G
\n\u78c1\u76d8\uff1aESSD P1 40G
\n[mysqld]\nslow_query_log=ON\nlong_query_time=3\ninnodb_buffer_pool_size = 1536M\ninnodb_log_file_size=256M\ninnodb_log_buffer_size=32M\n\u963f\u91cc\u76d1\u63a7\uff1a
\n
ATOP \uff08 10 \u5206\u949f\uff09:
\n![\"NqFgFWr\"](\"https://i.imgur.com/NqFgFWr.png\" "\\"NqFgFWr\\"/")
![\"QLD3fDs\"](\"https://i.imgur.com/QLD3fDs.png\" "\\"QLD3fDs\\"/")
\u6162 SQL \u65e5\u5fd7\uff1a
\n![\"yHquwHg\"](\"https://i.imgur.com/yHquwHg.png\" "\\"yHquwHg\\"/")
mysql8 IN \u548c EXISTS \u5b50\u67e5\u8be2\u4f1a\u81ea\u52a8\u8f6c\u5316\u4e3a join \u6216\u8005 semi-join \uff0c\u4e3a\u4ec0\u4e48 IN \u67e5\u8be2\u8fd8\u9700\u8981 EXISTS \u7b56\u7565\u4f18\u5316\uff1f\n\u9664\u4e86\u6709\u805a\u5408 HAVING \u8fd9\u4e2a\u4e0d\u80fd\u8f6c join \u7684\u786e\u5b9e\u7528 EXISTS \u6bd4\u8f83\u597d\uff0c\u5176\u4ed6\u7684\u597d\u50cf\u4f18\u5316\u5668\u8f6c\u5316\u540e\u7528 show warnings \u770b IN \u548c EXISTS \u8bed\u53e5\u662f\u4e00\u6837\u7684\u3002\u90a3\u8fd9\u7bc7\u5230\u5e95\u5728\u8bb2\u5565\uff1f https://dev.mysql.com/doc/refman/8.0/en/subquery-optimization-with-exists.html \uff0c\u8fd8\u662f\u8bf4\u6211\u7406\u89e3\u9519\u4e86\u3002
\n" }, { "author": { "url": "member/byerer", "name": "byerer", "avatar": "https://cdn.v2ex.com/gravatar/daf1b5970f4d4784745397fc6d449c5a?s=73&d=retro" }, "url": "t/1143515", "title": "\u4ec0\u4e48\u65f6\u5019\u53ef\u4ee5\u5c06 mysql \u9ed8\u8ba4\u9694\u79bb\u673a\u5236\u6539\u4e3a\u8bfb\u5df2\u63d0\u4ea4", "id": "t/1143515", "date_published": "2025-07-07T06:49:56+00:00", "content_html": "\u65b0\u4e1a\u52a1\u9700\u8981\u5728\u4e8b\u52a1\u4e2d\u4f7f\u7528\u4e50\u89c2\u9501\uff0c\u5728 RR \u4e0b\u9700\u8981\u56de\u6eda\u91cd\u8bd5\u6574\u4e2a\u4e8b\u52a1\uff0c\u800c rc \u53ea\u9700\u8981\u91cd\u8bd5\u67d0\u4e00\u4e2a\u66f4\u65b0\uff0c\u6709\u5fc5\u8981\u6539\u6210 rc \u5417\uff0c\u5982\u4f55\u5224\u65ad\u4e1a\u52a1\u5728\u6ee1\u8db3\u4ec0\u4e48\u6761\u4ef6\u4e0b\u53ef\u4ee5\u4e0d\u4f9d\u8d56 rr \uff0c\u662f\u4e0d\u662f\u53ea\u8981\u4e0d\u4f9d\u8d56\u53ef\u91cd\u590d\u8bfb\u5c31\u884c
\n" }, { "author": { "url": "member/abbychau", "name": "abbychau", "avatar": "https://cdn.v2ex.com/avatar/22a2/9e24/363353_large.png?m=1751618008" }, "url": "t/1142073", "title": "\u8de8\u5e73\u53f0\u7684 MySQL Parser", "id": "t/1142073", "date_published": "2025-06-30T12:17:45+00:00", "content_html": "\u6211\u525b\u641e\u597d\u4e86\u4e00\u500b MySQL \u89e3\u6790\u5668\uff0c\u4e4b\u5f8c\u6703\u7528\u5728 MIST \u88e1\u9762\u3002\u5927\u5bb6\u5bf9\u5927\u8868\u7684\u6392\u5e8f\u662f\u600e\u4e48\u4f18\u5316\u7684\uff1f\u76ee\u524d\u4e1a\u52a1\u4e0a\u6ca1\u6cd5\u4f18\u5316\uff0c\u53ea\u80fd\u67e5\u5168\u91cf\u6570\u636e\u4e14\u9700\u8981\u6839\u636e\u591a\u4e2a\u5b57\u6bb5\u6392\u5e8f\uff0c\u662f\u4e0d\u662f\u53ea\u80fd\u901a\u8fc7 Mongodb \u4e86\uff1f
\n" }, { "author": { "url": "member/WilliamColton", "name": "WilliamColton", "avatar": "https://cdn.v2ex.com/avatar/3a5e/dae7/552863_large.png?m=1750001532" }, "url": "t/1138738", "date_modified": "2025-06-16T00:33:09+00:00", "content_html": "\u4e4b\u524d\u5728\u4f7f\u7528 Mybatis plus \u7684\u65f6\u5019\u4f7f\u7528\u4e86\u4e3b\u952e\u751f\u6210\u7b56\u7565 IdType.ASSIGN_ID \uff0c
\n\u65b0\u589e\u884c\u7684\u4e3b\u952e\u503c\u90fd\u7279\u522b\u5927\uff0c\u7136\u540e\u5c31\u6539\u6210\u4e86\u6570\u636e\u5e93\u7684\u81ea\u589e\u7b56\u7565\uff0c
\n\u4f46\u662f\u65b0\u589e\u884c\u7684 id \u8fd8\u662f\u7279\u522b\u5927\uff0c\u4e00\u770b\u539f\u6765\u662f AUTO_INCREMENT \u7684\u503c\u53d8\u6210\u4e86 1933814216852774914 \uff0c
\n\u7136\u540e\u542c\u4e86 gpt \u7684\u4f7f\u7528 ALTER TABLE \u8868\u540d AUTO_INCREMENT = 1 \u547d\u4ee4\u53bb\u4fee\u6539\u5176\u503c\uff0c
\u4f46\u662f\u6539\u5b8c\u4e86\u4e00\u770b AUTO_INCREMENT \u8fd8\u662f\u7279\u522b\u5927\uff0c\u4e5f\u6ca1\u627e\u5230\u4ec0\u4e48\u8bf4\u660e\u6587\u6863\ud83e\udd79
\n\u6545\u6765\u6c42\u6559\u5404\u4f4d v \u53cb
\n", "date_published": "2025-06-15T15:40:30+00:00", "title": "Mysql \u65e0\u6cd5\u4fee\u6539\u81ea\u589e\u4e3b\u952e\u7684 AUTO_INCREMENT \u503c", "id": "t/1138738" }, { "author": { "url": "member/danaesoziommw49", "name": "danaesoziommw49", "avatar": "https://cdn.v2ex.com/gravatar/fb6ec572fa35491754633cbc06036e52?s=73&d=retro" }, "url": "t/1138433", "date_modified": "2025-06-13T10:20:12+00:00", "content_html": "\u539f\u673a\u5668\u662f \u5c0f\u578b NUC i5-10310U 8C8G5 \u5e74 Java \u540e\u7aef\u5f00\u53d1\uff0c\u4e00\u76f4\u6ca1\u6df1\u5165\u5b66\u4e60\u8fc7 MySQL \uff0c\u5e73\u65f6\u53ea\u662f\u4f7f\u7528\uff0c\u4e0d\u4e86\u89e3 MySQL \u539f\u7406\u6216\u8005\u6027\u80fd\u4f18\u5316\u3002
\n\u641c\u4e86\u4e0b\u770b\u5230\u5f88\u591a\u4eba\u63a8\u8350\u300a\u9ad8\u6027\u80fd MySQL \u300b\u8fd9\u672c\u4e66\uff0c\u4f46\u53d1\u73b0\u51e0\u4e2a\u95ee\u9898\uff1a
\n\u8bf7\u95ee\u6709\u8bfb\u8fc7\u7684 V \u53cb\u63a8\u8350\u4e00\u4e0b\u73b0\u5728\u5b66\u4e60 MySQL \u8be5\u8bfb\u54ea\u672c\u4e66\u7c4d\uff0c\u6216\u8005\u54ea\u4e2a\u8001\u5e08\u7684\u89c6\u9891\u5462\uff1f
\n\u8dea\u6c42\u89e3\u7b54\uff01
\n" }, { "author": { "url": "member/mikewang", "name": "mikewang", "avatar": "https://cdn.v2ex.com/avatar/b728/8030/81681_large.png?m=1683726911" }, "url": "t/1133409", "date_modified": "2025-05-22T00:36:06+00:00", "content_html": "\u6628\u5929\u7684 /t/1133223 \u5438\u5f15\u4e86\u5927\u5bb6\u4e0d\u5c11\u7684\u8ba8\u8bba\uff0c\u4eca\u5929\u6211\u6765\u8bf4\u4e00\u4e2a\u5de5\u4f5c\u4e0a\u9047\u5230\u7684\u95ee\u9898\u3002
\n\u51c6\u786e\u5730\u8bf4\uff0c\u8fd9\u4e2a\u95ee\u9898\u662f MySQL \u5b57\u7b26\u96c6\u4e2d\u7684\u6821\u5bf9\u89c4\u5219\u51fa\u4e86 BUG \uff0c\u5b57\u7b26\u96c6\u672c\u8eab\u662f\u65e0\u8f9c\u7684\u3002
\n\u8fd9\u4e2a bug \u73b0\u5728\u90fd\u8fd8\u5728\uff0c\u6b22\u8fce\u5927\u5bb6\u9a8c\u8bc1\u54c8\u3002
\n\u6545\u4e8b\u662f\u8fd9\u6837\u7684\u3002
\n\u540c\u4e8b\u5728\u8fde MySQL \u5e93\u505a\u6d4b\u8bd5\u65f6\u53d1\u73b0\u4e86\u4e00\u4e2a\u8be1\u5f02\u7684\u73b0\u8c61\uff1a\u67e5\u4e0d\u5230\u5339\u914d\u7684\u6570\u636e\u3002
\n\u76f8\u5173\u8bed\u53e5\u7b80\u5316\u5982\u4e0b\uff08\u4e3b\u952e\u7b49\u5b57\u6bb5\u5df2\u7701\u7565\uff09\uff1a
\ncreate table t1 ( c1 varchar(16), key idx (c1) ) collate=utf8mb4_bin;\n\ninsert into t1 values ('000\\n'), ('123\\n'), ('abc\\n');\n\nselect * from t1 where c1 like 'abc%';\n\u8fd9\u600e\u4e48\u770b\uff0c\u90fd\u5e94\u8be5\u5339\u914d\u51fa 'abc\\n'\uff0c\u5bf9\u5427\uff1f
\u4e8b\u5b9e\u60c5\u51b5\u662f\uff1a
\nmysql> select * from t1 where c1 like 'abc%';\nEmpty set (0.00 sec)\n\u5929\u584c\u4e86\uff0c\u67e5\u51fa\u6765\u7adf\u7136\u662f\u7a7a\u7684\u3002
\n\u7136\u540e\u6211\u62ff\u540c\u6837\u7684\u8bed\u53e5\u5728 OceanBase \u4e0a\u8dd1\u4e86\u4e00\u4e0b\uff0c\u7adf\u7136\u4e5f\u662f\u7a7a\u3002\uff08\u4e24\u773c\u4e00\u9ed1\uff09
\n\u53ef\u80fd\u4f1a\u6709\u4eba\u8bf4\uff0c\u90a3\u80af\u5b9a\u662f\u4f60\u5199\u7684\u8bed\u53e5\u6709\u95ee\u9898\uff0c\u6216\u8005 utf8mb4_bin \u5c31\u8fd9\u6837\uff0c\u5427\u5566\u5427\u5566\u3002
\n\u90a3\u5982\u679c\u8fd9\u6837\u5462\uff1a
\nmysql> alter table t1 drop index idx;\nQuery OK, 0 rows affected (0.001 sec)\nRecords: 0 Duplicates: 0 Warnings: 0\n\nmysql> select * from t1 where c1 like 'abc%';\n+------+\n| c1 |\n+------+\n| abc\n |\n+------+\n1 row in set (0.001 sec)\n\u54ce\uff0c\u7d22\u5f15\u5220\u4e86\u5c31\u597d\u4e86\u3002
\n\u603b\u4e0d\u80fd\u8bf4\uff0c\u52a0\u4e2a\u7d22\u5f15\uff0c\u80fd\u628a\u7ed3\u679c\u96c6\u641e\u6ca1\u5427\u3002\u90a3\u80af\u5b9a bug \u4e86\u3002
\n\u90a3\u5230\u5e95\u662f\u548b\u56de\u4e8b\u5462\uff1a\u5e26\u4e0a\u7d22\u5f15\uff0c\u6211\u4eec explain \u770b\u4e00\u4e0b\u3002
\nmysql> explain format=tree select * from t1 where c1 like 'abc%' \\G\n*************************** 1. row ***************************\nEXPLAIN: -> Filter: (t1.c1 like 'abc%') (cost=0.46 rows=1)\n -> Covering index range scan on t1 using idx over ('abc' <= c1 <= 'abc?????????????') (cost=0.46 rows=1)\n\n1 row in set (0.001 sec)\n\u539f\u6765\u8fd9\u4e2a\u524d\u7f6e\u5339\u914d\uff0c\u56e0\u4e3a\u6709\u7d22\u5f15\uff0c\u4f18\u5316\u4e3a\u4e86\u8303\u56f4\u67e5\u8be2\u3002\u540e\u9762\u7684\u4e00\u4e32 ? \u5176\u5b9e\u662f 0xff\uff0c\u6ca1\u4ec0\u4e48\u95ee\u9898\u3002
\u90a3\u770b\u4e0b 'abc\\n' \u548c 'abc' \u5462\uff1f
mysql> set collation_cOnnection=utf8mb4_bin;\nQuery OK, 0 rows affected (0.000 sec)\n\nmysql> select 'abc\\n' < 'abc';\n+-----------------+\n| 'abc\\n' < 'abc' |\n+-----------------+\n| 1 |\n+-----------------+\n1 row in set (0.000 sec)\n\u518d\u6b21\u4e24\u773c\u4e00\u9ed1\u3002\u6211\u5012\uff0c\u600e\u4e48\u4f1a\u8fd9\u6837\u3002\u8fd9\u662f\u4ec0\u4e48\u6392\u5e8f\u89c4\u5219\u3002\u770b\u4e0b utf8mb4_bin \u5427\u3002
\nmysql> show collation like 'utf8mb4_bin';\n+-------------+---------+----+---------+----------+---------+---------------+\n| Collation | Charset | Id | Default | Compiled | Sortlen | Pad_attribute |\n+-------------+---------+----+---------+----------+---------+---------------+\n| utf8mb4_bin | utf8mb4 | 46 | | Yes | 1 | PAD SPACE |\n+-------------+---------+----+---------+----------+---------+---------------+\n1 row in set (0.001 sec)\nPad_attribute \u662f PAD SPACE\uff0c\u8868\u793a\u5bf9\u9f50\u957f\u5ea6\u65f6\uff0c\u540e\u9762\u8865\u7a7a\u683c\u3002\u8fd9\u4e0b\u5c31\u8bf4\u901a\u4e86\u3002\u7a7a\u683c\u662f 0x20\uff0c\u6362\u884c\u7b26\u662f 0x0a\u3002\\n \u6bd4 \u5c0f\u3002
\u6240\u4ee5\uff01\uff01\u867d\u7136\u53cd\u76f4\u89c9\uff0c\u5728 utf8mb4_bin \u4e0b\uff0c'abc\\n' \u5c31\u662f 'abc' \u5c0f\uff01
\u7ed3\u8bba\uff1alike 'abc%' \u7684\u8303\u56f4\u67e5\u8be2\u4f18\u5316\u6709\u95ee\u9898\u3002
\u5173\u4e8e\u8fd9\u4e2a bug \uff0c\u6211\u5df2\u7ecf\u5411 MySQL \u63d0\u4ea4\u4e86 patch \uff0c\u4f46\u662f\u4f3c\u4e4e\u6ca1\u6709\u5f97\u5230\u5173\u6ce8\u3002\u6211\u770b\u4e86\u4e0b\u66f4\u65b0\u65e5\u5fd7\uff0c\u6211\u63d0\u7684\u53e6\u4e00\u4e2a patch \u5df2\u7ecf\u88ab\u5408\u5165\uff0c\u4f46\u662f\u8fd9\u4e2a\u95ee\u9898\u4f9d\u7136\u8fd8\u5728\u3002\u770b\u6765\u6d89\u53ca\u5230\u5b57\u7b26\u96c6\uff0c\u8fd9\u4e2a\u5751\u9ebb\u70e6\u5230\u4ed6\u4eec\u90fd\u4e0d\u60f3\u5904\u7406\u4e86\u3002
\n![\"\"](\"https://i.imgur.com/UASkTDJ.png\"/)
\n[ \u540c\u4e00\u65f6\u95f4\u63d0\u4ea4\u7684\u4ee3\u7801\u5df2\u7ecf\u5408\u5165 ]
![\"\"](\"https://i.imgur.com/AUjpBmz.png\"/)
\n[ \u8fd9\u4e2a\u95ee\u9898\u8fd8\u662f\u6253\u5f00\u7684 ]
\u5982\u679c\u54ea\u5929\u4ed6\u4eec\u5408\u5165\u6216\u8005\u89e3\u51b3\u4e86\uff0c\u6211\u518d append \u65b0\u7684\u8fdb\u5c55\u3002
\n", "date_published": "2025-05-22T00:33:27+00:00", "title": "\u5751\u7239\u7684\u5b57\u7b26\u96c6\u95ee\u9898\uff1a\u8e29\u5230\u4e86 MySQL \u7684 bug", "id": "t/1133409" }, { "author": { "url": "member/IIIIZAYOI", "name": "IIIIZAYOI", "avatar": "https://cdn.v2ex.com/avatar/ac41/73e3/666624_large.png?m=1745983655" }, "url": "t/1128908", "date_modified": "2025-04-29T07:57:32+00:00", "content_html": "\u4ece\u4e92\u8054\u7f51\u5927\u6570\u636e\u5c97\u4f4d\u8df3\u69fd\u5230\u5236\u9020\u4e1a ToB \u516c\u53f8\uff0c\u672c\u4ee5\u4e3a\u80fd\u9003\u79bb\u201c\u5377\u9700\u6c42\u201d\uff0c\u7ed3\u679c\u53d1\u73b0\u771f\u6b63\u7684\u5669\u68a6\u662f\u201c\u6ca1\u6709\u9700\u6c42\u201d\u2014\u2014\u53ea\u6709\u9886\u5bfc\u7684\u6a21\u7cca\u6982\u5ff5\u548c\u4e1a\u52a1\u90e8\u95e8\u7684\u201c\u4e0e\u6211\u65e0\u5173\u201d\ud83d\ude07
\n\u73b0\u5728\u5728\u8fd9\u4e2a\u516c\u53f8,\u5c31\u611f\u89c9\u9700\u6c42\u50cf\u4e2a\u4f20\u8bdd\u6e38\u620f\uff1a\u5927\u8001\u677f\u8bf4\u201c\u8981\u505a\u6570\u636e\u9a71\u52a8\u201d\uff0c\u4f20\u5230\u5b50\u516c\u53f8 A \u53d8\u6210\u201c\u968f\u4fbf\u7ed9\u4e2a\u770b\u677f\u201d\uff0c\u5b50\u516c\u53f8 B \u76f4\u63a5\u88c5\u6b7b\uff0c\u6700\u540e\u6211\u4eec\u4fe9\u5939\u5728\u4e2d\u95f4\uff0c\u7528 SQL \u7ed9\u9886\u5bfc\u9020\u6d77\u5e02\u8703\u697c\u2026
\n\u5efa\u6a21\u8ddf\u5c3c\u9a6c\u7684\u4fa6\u63a2\u7834\u6848\u4e00\u6837\u4e1a\u52a1\u90e8\u95e8\u81ea\u5df1\u90fd\u8bf4\u4e0d\u6e05\u6307\u6807\u53e3\u5f84\uff0c\u95ee\u5c31\u662f\u201c\u5927\u6982\u548c\u53bb\u5e74\u4e00\u6837\u201d\uff0c\u7b49\u5f00\u53d1\u5b8c\u4e86\u624d\u8df3\u51fa\u6765\u8bf4\u201c\u8fd9\u6570\u4e0d\u5bf9\u201d\uff08\u8279,\u4f60\u4eec\u5012\u662f\u65e9\u8bf4\u554a\uff01\uff09
\n\u8981\u4e2a\u6570\u636e\u50cf\u8ba8\u503a\u4e00\u6837\uff0c\u5bf9\u65b9\u4e00\u53e5\u201c\u7cfb\u7edf\u8001\u65e7\u5bfc\u4e0d\u51fa\u6765\u201d\u5c31\u80fd\u6253\u53d1\u6211\u4eec.
\n\u6700\u8fd1\u9886\u5bfc\u53c8\u60f3\u8d77\u6765\u8981\u6cbb\u7406\u6570\u636e\u4e86,\u8981\u6c42\u4e24\u4e2a\u4eba\u7684\u56e2\u961f\u80fd\u96c6\u6210\u5168\u96c6\u56e2\u4e1a\u52a1\u6570\u636e\u641e\u51fa\u4f53\u7cfb\u5316\u7684\u6570\u636e\u5efa\u6a21.\u4f1a\u4e0a\u8bf4\u4e86\u505a\u4e0d\u6765,\u5c31\u8981\u6c42\u6211\u4eec\u53c2\u8003\u5176\u4f59\u5236\u9020\u4e1a\u7684\u7ecf\u9a8c,\u8981\u6211\u4eec\u53bb\u8c03\u7814.\u6211\u5bfb\u601d\u54ea\u5bb6\u505a\u7684\u597d\u7684\u5236\u9020\u4e1a\u80fd\u4e24\u4e2a\u4eba\u641e\u6570\u4ed3.....\u518d\u8bf4\u4e86,\u4e24\u4e2a\u81ed\u5f00\u53d1\u7684\u548b\u80fd\u8981\u5230\u522b\u4eba\u4f01\u4e1a\u7684\u5185\u90e8\u642d\u5efa\u7ecf\u9a8c,\u5934\u90fd\u88c2\u5f00
\n\u6709\u524d\u8f88\u6307\u70b9\u4e0b\u4e0d?\u6211\u73b0\u5728\u5230\u5e95\u8be5\u81ea\u4e0a\u800c\u4e0b\u786c\u521a\uff0c\u8fd8\u662f\u81ea\u4e0b\u800c\u4e0a\u5077\u8dd1\uff1f
\n", "date_published": "2025-04-29T07:53:13+00:00", "title": "\u4e24\u4e2a\u4eba\u7684\u6570\u636e\u5f00\u53d1\u56e2\u961f,\u88ab\u8981\u6c42\u4ece\u96f6\u5f00\u59cb\u6cbb\u7406\u4f01\u4e1a\u6570\u636e", "id": "t/1128908" }, { "author": { "url": "member/eveqvq982", "name": "eveqvq982", "avatar": "https://cdn.v2ex.com/gravatar/8fba473d45a3a42627b61bf32147d894?s=73&d=retro" }, "url": "t/1120026", "date_modified": "2025-03-21T03:30:04+00:00", "content_html": "\u5728\u4f7f\u7528 Metabase 0.53.6 \u8fde\u63a5 1Panel \u81ea\u5e26\u7684 MySQL 8.4.4 \u65f6\uff0c\u51fa\u73b0\u6570\u636e\u5e93\u94fe\u63a5\u5931\u8d25 API Health \u6d4b\u8bd5\u5931\u8d25
Public Key Retrieval is not allowed\u3002 \u5bbf\u4e3b\u673a
\u5bb9\u5668\u7c7b\u578b
\u64cd\u4f5c\u7cfb\u7edf
\u9762\u677f
MySQL \u7248\u672c
\u200b\u521d\u6b65\u6000\u7591 1Panel \u95ee\u9898\uff1a
\n\u200b\u5c1d\u8bd5\u66f4\u6362\u6570\u636e\u5e93\uff1a
\n\u200b\u6000\u7591 1Panel \u955c\u50cf\u95ee\u9898\uff1a
\n\u200b\u89e3\u51b3\u65b9\u6848\uff1a
\n\u5751\u7239\u554a\u65b0\u7248\u672c \u7eaf\u7eaf\u6d6a\u8d39\u65f6\u95f4 \u6211\u8fd8\u641c\u4e86\u4e00\u5708\u6ca1\u4eba\u53d1\u76f8\u5173\u5185\u5bb9
\n", "date_published": "2025-03-21T01:29:04+00:00", "title": "MySQL 8.4 LTS \u4e0e Metabase \u5947\u602a\u517c\u5bb9\u6027\u95ee\u9898\uff1a\u964d\u7ea7\u5230 8.0.4 \u540e\u95ee\u9898\u89e3\u51b3 (1Panel and BT Panel \u590d\u73b0)", "id": "t/1120026" }, { "author": { "url": "member/qbmiller", "name": "qbmiller", "avatar": "https://cdn.v2ex.com/avatar/268d/e11a/236713_large.png?m=1726119735" }, "url": "t/1118327", "date_modified": "2025-03-14T01:44:33+00:00", "content_html": "\u6c42\u6559\u9ad8\u624b\u4eec\uff0c\u4e09\u56db\u7ebf\u57ce\u5e02\uff0c\u4f20\u7edf\u884c\u4e1a\u3002\u516c\u53f8\u51e0\u4e4e\u4e0d\u7528\u4e91\u670d\u52a1\u3002\u963f\u91cc\u4e91 RDS mysql5.7 \uff0c \u4e00\u4e2a\u51e0\u767e\u884c\u7684\u8868\uff0c\u7a81\u7136\u4e00\u6761\u63d2\u5165\u7684\u8bb0\u5f55\u81ea\u589e ID \u6210\u4e86 2147483647 \uff0c\u5df2\u7ecf\u6392\u9664\u4e86\u65e0\u9650\u5faa\u73af\u9519\u8bef\u5199\u5165\u5bfc\u81f4\u7684 ID \u81ea\u589e\u6ea2\u51fa\uff0c\u6216\u8005\u5728\u63d2\u5165\u65f6\u9519\u8bef\u7684\u5e26\u5165 ID \u503c\uff0c\u8fd8\u6709\u4ec0\u4e48\u53ef\u80fd\u539f\u56e0\u4e48\uff1f
\n", "date_published": "2025-03-07T01:26:20+00:00", "title": "mysql \u81ea\u589e ID \u7a81\u7136\u53d8\u4e3a int \u6700\u5927\u503c\u95ee\u9898", "id": "t/1116547" }, { "author": { "url": "member/werwer", "name": "werwer", "avatar": "https://cdn.v2ex.com/gravatar/9a88b83b75a31ee203c47cd7cc38ce1f?s=73&d=retro" }, "url": "t/1113674", "date_modified": "2025-02-24T00:27:03+00:00", "content_html": "\u6211\u7528 C:\\ProgramData\\MySQL\\MySQL Server 8.0\\Data\\\u6587\u4ef6\u5939\u7684\u5907\u4efd\u8986\u76d6\u4e86\u73b0\u5728\u7684 data \u6587\u4ef6\u5939\uff0c\u5ba2\u6237\u4e70\u4e86\u4e00\u5957\u95ed\u6e90\u7684\u7a0b\u5e8f\u7528\u4e8e\u8fd0\u8425\u3002MySQL \u6570\u636e\u5e93\u7528\u7684\u662f CDB \uff0c\u4f46\u662f\u73b0\u5728\u9047\u5230\u4e00\u4e2a\u95ee\u9898\uff1a
\n\u56e0\u4e3a\u90a3\u5957\u7a0b\u5e8f\u5bf9\u4e8e\u6570\u636e\u5e93\u7684\u4f18\u5316\u660e\u663e\u4e0d\u8db3\uff0c\u6709\u4e00\u4e9b\u5f88\u8981\u547d\u7684\u6162\u67e5\u8be2\u62d6\u6162\u6574\u4e2a\u5e93\u3002\u4e8e\u662f\uff0c\u6211\u4eec\u52a0\u4e86 2 \u4e2a\u7d22\u5f15\u3002\u6027\u80fd\u95ee\u9898\u6682\u65f6\u662f\u89e3\u51b3\u4e86\u3002
\n\u4f46\u662f\u5947\u8469\u7684\u662f\uff0c\u8fd9\u5957\u7a0b\u5e8f\u4f1a\u4e3b\u52a8\u68c0\u6d4b\u7d22\u5f15\uff0c\u7136\u540e\u7ed9 DROP \u6389\u3002\u9891\u7e41\u7684\u6389\u7d22\u5f15\uff0c\u6211\u4eec\u5c31\u5199\u4e86\u4e2a\u5b9a\u65f6\u4efb\u52a1\u53bb\u52a0\u7d22\u5f15\u3002\u4e8e\u662f\u8fd9\u5957\u7a0b\u5e8f\u5c31\u662f\u5728\u4e0d\u65ad\u7684 add index \u548c drop index, \u56e0\u4e3a\u521a\u5f00\u59cb\u9891\u7387\u4e0d\u662f\u5f88\u9ad8\uff0c\u6240\u4ee5\u52c9\u5f3a\u80fd\u7528\u3002
\n\u4f46\u662f\u6700\u8fd1\u6bcf\u5929\u7684\u9891\u7387\u8d8a\u6765\u8d8a\u9ad8\uff0c\u5bfc\u81f4\u4e0d\u53ef\u7528\u65f6\u95f4\u5360\u6bd4\u8d8a\u6765\u8d8a\u591a\u3002\u5230\u4e86\u65e0\u6cd5\u5fcd\u53d7\u7684\u5730\u6b65\u3002
\n\u6211\u60f3\u7684\u89e3\u51b3\u529e\u6cd5\uff1a\u7ed9 CDB \u8fd9\u4e2a\u7528\u6237\u53bb\u9664\u7d22\u5f15\u7684\u6743\u9650\u3002\u4f46\u662f\u7a0b\u5e8f\u4f1a\u62a5\u9519\uff0c\u65e0\u6cd5\u8fd0\u884c\u3002
\n\u73b0\u5728\u60f3\u6c42\u6559\uff0c\u6709\u6ca1\u6709\u7c7b\u4f3c\u7684\u4e2d\u95f4\u4ef6\uff0c\u53ef\u4ee5\u5728\u4e0d\u4fee\u6539\u4ee3\u7801\u7684\u60c5\u51b5\u4e0b\uff0c\u6b3a\u9a97\u5ba2\u6237\u7aef\uff0c\u4e22\u5f03\u6389 drop index \u7684\u64cd\u4f5c\u800c\u4e0d\u4f1a\u62a5\u9519\uff1f
\n", "date_published": "2025-02-17T11:57:21+00:00", "title": "\u5404\u4f4d\u5927\u4f6c\uff0c\u6709\u4e2a\u5947\u8469\u7684\u6280\u672f\u95ee\u9898", "id": "t/1112124" }, { "author": { "url": "member/qtxxm", "name": "qtxxm", "avatar": "https://cdn.v2ex.com/gravatar/0ff395c144b1e701d19179c679d92494?s=73&d=retro" }, "url": "t/1111463", "title": "\u5173\u4e8e mysql trx_id \u7684\u7591\u60d1 \u53d1\u5e16\u4e00\u95ee", "id": "t/1111463", "date_published": "2025-02-14T06:38:10+00:00", "content_html": "\u8bf7\u6559\u4e00\u4e2a\u95ee\u9898\uff0c
\nBEGIN;\nselect * from sys_hosts;\nSELECT TRX_ID FROM INFORMATION_SCHEMA.INNODB_TRX WHERE TRX_MYSQL_THREAD_ID = CONNECTION_ID();\nCOMMIT;\n\u8fd4\u56de\u5982\u4e0b\n+-----------------+\n| TRX_ID |\n+-----------------+\n| 421114694075176 |\n+-----------------+\n1 row in set (0.00 sec)
\nBEGIN;\ndelete from sys_hosts WHERE id < 0;\nSELECT TRX_ID FROM INFORMATION_SCHEMA.INNODB_TRX WHERE TRX_MYSQL_THREAD_ID = CONNECTION_ID();\nCOMMIT;\n\u8fd4\u56de\u5982\u4e0b\n+---------+\n| TRX_ID |\n+---------+\n| 1092017 |\n+---------+\n1 row in set (0.00 sec)
\n\u4ee5\u4e0a\uff0c\u53ea\u8bfb\u4e8b\u52a1\u4e2d\u7684 \u4e8b\u52a1 id \u662f\u4e00\u4e2a\u975e\u5e38\u5927\u7684\u503c 421114694075176\n\u5b9e\u9645\u4e0a\u5982\u679c\u6570\u636e\u5e93\u6709\u5199\u64cd\u4f5c\uff0c\u5f97\u5230\u7684\u771f\u5b9e\u4e8b\u52a1 id \u662f\u4e00\u4e2a\u9010\u6e10\u9012\u589e\u7684\u503c\uff0c\u6bd4\u5982\u8fd9\u91cc 1092017\uff0c\u8fd9\u4e2a\u503c\u4f1a\u7528\u4e8e\u5b9e\u9645\u6570\u636e\u884c\u4e2d\u7684\u9690\u85cf\u5217 trx_id
\n\u90a3\u4e48\u8bf7\u95ee\u5927\u4f6c\u4eec
\n\u4e00\u4e2a\u5b57\u6bb5\u91d1\u989d,\u4e00\u79d2\u53ef\u80fd\u8981\u66f4\u65b0\u4e0a\u767e\u6b21,\u5c31\u4f1a\u5361\u987f\u6b7b\u9501\uff0c\u5e94\u8be5\u600e\u4e48\u5904\u7406\u6bd4\u8f83\u597d
\n" }, { "author": { "url": "member/qazwsxkevin", "name": "qazwsxkevin", "avatar": "https://cdn.v2ex.com/gravatar/bfefb99d6203d351791672a1d3fc936a?s=73&d=retro" }, "url": "t/1108846", "title": "\u6709\u7528\u8fc7 SyncNavigator \u6216\u8005\u7c7b\u4f3c\u7684\u7b80\u5355\u6570\u636e\u5e93\u540c\u6b65\u8f6f\u4ef6\u5417\uff0c", "id": "t/1108846", "date_published": "2025-02-04T07:44:51+00:00", "content_html": "\u8001\u673a\u5668\uff0c\u6e90\u5e93 MySQL 5.6 \uff0c\u6ca1\u6709\u5f00 binlog \uff0c\u78c1\u76d8\u3001\u7f51\u7edc\u63a5\u53e3 I/O \u90fd\u5f88\u6162\uff0c\u6574\u4e2a\u5e93\u6709 80 \u591a GB
\n\u76ee\u6807\u6570\u636e\u5e93\u662f MySQL 8.0 \uff0c\u65b0\u5efa\u7684\uff0c
\n\u6e90\u6570\u636e\u5e93\u8fd8\u5728\u8fd0\u884c\uff0c\u4e5f\u4e0d\u662f\u4e0d\u80fd\u505c\uff0c\u5468\u672b\uff0c\u6e90\u6570\u636e\u5e93\u4e00\u5b9a\u4f1a\u6ca1\u6709\u4efb\u4f55\u8bfb\u5199\uff0c\u6216\u8005\u5be5\u5be5\u51e0\u6761
\n
\n\u8bf7\u95ee\uff0cSyncNavigator \u8fd9\u4e2a\u8f6f\u4ef6\u80fd\u591f\u5728\u539f\u6570\u636e\u5e93\u4e0d\u505c\u7684\u60c5\u51b5\u4e0b\uff0c
\n\u5de5\u4f5c\u5929\u5f00\u59cb\u540c\u6b65\uff0c\u5728\u5468\u516d\u65e5\u67d0\u4e2a\u65f6\u5019\uff0c\u6e90\u6570\u636e\u5e93\u548c\u76ee\u6807\u6570\u636e\u5e93\u5185\u5bb9\u5b8c\u6210\u4e00\u81f4\u540c\u6b65\u5417\uff1f
\n
\n\u5982\u679c SyncNavigator \u505a\u4e0d\u5230\uff0c\u6709\u4ec0\u4e48\u8f6f\u4ef6\u201c\u65e0\u9700\u592a\u591a\u624b\u5de5\u201d\u53ef\u4ee5\u505a\u5230\uff1f
mysql 8.0 Windows \u7248\u672c\u3002
\ntb_quote (\n op_date ,\n code ,\n price ,\n ratio ,\n hsl ,\n index unique idx_1 (op_date,code) ,\n index idx_2(code)\n )\n\u6bcf\u4e2a\u4ea4\u6613\u65e5 6000 \u6761\uff0c\u4e00\u5e74\u51e0\u767e\u4e07\u6761\u89c4\u6a21\u3002
\n\u5b9e\u73b0\u8bed\u53e5\u5f88\u7b80\u5355\uff1a
\n\u65b9\u6848\u4e00\uff1a\n\u7b2c\u4e00\u6761\u8bed\u53e5\u5728 1 \u79d2\u5185\u8fd4\u56de\u7ed3\u679c\uff1a(20 \u6761\u8bb0\u5f55\uff09
\nselect code from tb_quote where op_date='yyyy-mm-dd' and ratio >3 and ratio <5 and hsl>5 and hsl <10 \n\u5d4c\u5957\u7b2c\u4e8c\u6761\u540e\uff1a
\n select a.* from tb_quote a join ( \n select code from tb_quote b where op_date='yyyy-mm-d1' and ratio >3 and ratio <5 and hsl>5 and hsl <10 \uff09 t\n on a.code=t.code and a.op_date='yyyy-mm-d2' \n\u6267\u884c\u65f6\u95f4\u5c31\u8d85\u8fc7 1 \u5206\u949f\uff01
\n** \u67e5\u770b mysql \u89e3\u91ca\uff1a **
\n** \u65b9\u6848\u4e8c\uff1a **\n\u4f46\u662f\u5982\u679c\u628a\u7b2c\u4e00\u6761\u8bed\u53e5\u7684\u7ed3\u679c\u4fdd\u5b58\u5728\u4e00\u4e2a\u8868 tmp \u91cc\u9762\uff0c\u5e76\u4e14 code \u5efa\u7acb\u666e\u901a\u7d22\u5f15\u4ee5\u540e\uff0c\u53d8\u6210\uff1a
\nselect a.* from tb_quote a join (\n select code from tmp ) t\non a.code=t.codeand a.op_date='yyyy-mm-d3'\n\u6267\u884c\u65f6\u95f4\u4e0d\u8d85\u8fc7 1 \u79d2\uff01\uff01\uff01
\n** \u67e5\u770b mysql \u89e3\u91ca\uff1a**
\n\u53d1\u73b0\u5dee\u522b\u5728\uff1a
\n\u4e0d\u77e5\u9053 mysql \u662f\u600e\u4e48\u4f18\u5316\u7684\uff1f\u5982\u679c\u4e0d\u7528\u4e2d\u95f4\u8868\u8fc7\u6e21\u7684\u8bdd\uff0c\u5e94\u8be5\u600e\u4e48\u5199 sql \uff1f
\n", "date_published": "2025-01-14T07:36:37+00:00", "title": "mysql \u9047\u5230\u6700\u611a\u8822\u7684\u67e5\u8be2\u6027\u80fd\u95ee\u9898\uff0c\u6c42\u89e3\u51b3", "id": "t/1105019" }, { "author": { "url": "member/jiaoguan1688", "name": "jiaoguan1688", "avatar": "https://cdn.v2ex.com/avatar/e043/056c/456168_large.png?m=1745522707" }, "url": "t/1104007", "date_modified": "2025-01-10T11:11:11+00:00", "content_html": "\u7ebf\u4e0a\u73b0\u5728\u8fd0\u884c\u7684 mysql \u91cc\u9762\u7684\u5b57\u6bb5\u540d\u9700\u8981\u589e\u52a0\u4e00\u4e9b,\u672c\u5730\u5df2\u7ecf\u589e\u52a0\u597d\u4e86\n\u5982\u4f55\u52a0\u5230\u7ebf\u4e0a\u7248\u672c\u6bd4\u8f83\u4f18\u96c5.
\n", "date_published": "2025-01-09T14:11:23+00:00", "title": "\u6709\u4ec0\u4e48\u4f18\u96c5\u7684 mysql \u589e\u52a0\u5b57\u6bb5\u540d\u7684\u65b9\u6cd5\u5462?", "id": "t/1104007" }, { "author": { "url": "member/Vesc", "name": "Vesc", "avatar": "https://cdn.v2ex.com/avatar/60df/cc1d/686441_large.png?m=1759061651" }, "url": "t/1103625", "date_modified": "2025-01-08T10:15:13+00:00", "content_html": "\u4e3a\u5565\u7f16\u8f91\u8001\u662f\u63d0\u793a\u62e6\u622a", "date_published": "2025-01-08T10:08:36+00:00", "title": "\u5404\u4f4d Mysql \u5927\u4f6c\uff0c\u95ee\u4e00\u4e2a 8.0 \u7248\u672c json \u7684\u95ee\u9898", "id": "t/1103625" }, { "author": { "url": "member/hhhhhh123", "name": "hhhhhh123", "avatar": "https://cdn.v2ex.com/gravatar/55110ada7d1839cd948e99642d4f2e72?s=73&d=retro" }, "url": "t/1103619", "date_modified": "2025-01-08T11:15:37+00:00", "content_html": "\u4e0b\u9762\u662f\u8bf4\u660e\u548c\u5f53\u65f6\u573a\u666f
\nmysql \u7248\u672c 8.0+
\n\u5f53\u521d\u8bbe\u8ba1\u7684\u65f6\u5019\u8fd8\u662f\u6b20\u8003\u8651\u4e86\u3002 \u5509\uff5e
\nsql \u4e2d\u7684 date() \u51fd\u6570\u7528\u7684\u65f6\u5019\u4e00\u65f6\u723d\uff0c \u73b0\u5728\u5934\u5927\u3002
\u6211\u81ea\u5df1\u7684 app \u57fa\u672c\u4e0a\u6240\u6709\u7684\u65f6\u95f4\u67e5\u8be2\u6211\u90fd\u4f7f\u7528\u4e86 date \u51fd\u6570 QAQ
\n\u73b0\u5728\u54ed\u7740\u6539\u4ee3\u7801 QAQ \uff5e
\n\u6bd4\u5982
select uid, balance, create_time from day_check_in where date(create_time) = date(%(\u5165\u53c2\u65f6\u95f4)s) and uid = '123';\n\u8fd1\u671f\u60f3\u4f18\u5316\u63a5\u53e3\uff0c\u4f7f\u7528 EXPLAIN \u4e00\u770b\u5934\u76ae\u53d1\u9ebb\uff0c \u867d\u7136\u76ee\u524d\u6570\u636e\u91cf\u4e0d\u591a\uff0c\u4f46\u662f\u5f88\u96be\u770b\u3002
\n\u5f53\u6211\u7ffb\u770b\u6587\u6863\u548c\u641c\u7d22\u540e\u53d1\u73b0 \u53ef\u4ee5\u4f7f\u7528 online DDL \u521b\u5efa\u7d22\u5f15\u7684\u65f6\u5019 \u53ef\u4ee5\u5c3d\u53ef\u80fd\u7684\u4e0d\u5f71\u54cd CURD \u64cd\u4f5c\uff0c\u4e0d\u8fc7\u4e00\u4e9b \u7279\u6b8a\u7684 sql \u8fd8\u662f\u4f1a\u5f71\u54cd\uff0c\u4f1a\u7b49\u5f85\u521b\u5efa\u7d22\u5f15\u540e\u624d\u80fd\u6267\u884c\u4e00\u4e9b\u67e5\u8be2\u3002\n\u4e0d\u8fc7\u8fd9\u4e2a\u95ee\u9898\u4e0d\u5927\uff0c\u56e0\u4e3a\u6211\u53ef\u4ee5\u907f\u5f00\u8fd9\u4e2a\u65f6\u95f4\u6bb5\uff01
\n\u540e\u9762\u6211\u6267\u884c\u4e86
\nALTER TABLE balance_records ADD INDEX index_uid_create_time (uid, create_time)\n\u53d1\u73b0\u6267\u884c\u4e86 5 \u5206\u949f\u8fd8\u662f\u6ca1\u6709\u6267\u884c\u6210\u529f\u3002 \u4f7f\u7528 SHOW PROCESSLIST; \u67e5\u770b sql \u7684\u8fd0\u884c\u60c5\u51b5\uff0c\u53d1\u73b0\u6ca1\u6709\u4ec0\u4e48 sql \u548c\u521b\u5efa\u7d22\u5f15 sql \u51b2\u7a81\uff0c \u610f\u5473\u7740 \u521b\u5efa\u7d22\u5f15 sql \u8fd8\u5728\u6267\u884c\u3002
\n\u6211\u4ee5\u4e3a\u662f\u6570\u636e\u91cf\u5927\u7684\u539f\u56e0\uff0c \u5f53\u6211\u628a\u8fd9\u4e2a\u8868\u6240\u6709\u7684\u6570\u636e\u62f7\u8d1d\u5230 test \u5e93\u4e2d\uff0c \u6211\u6267\u884c\u4e86 \u521b\u5efa\u7d22\u5f15\u7684\u6307\u4ee4\uff0c\u7ed3\u679c 2 \u79d2\u5c31\u6267\u884c\u5b8c\u4e86\u3002
\n\u6211\u60f3\u77e5\u9053\u4e3a\u5565\uff1f
\n\u76ee\u524d\u4e00\u76f4\u6ca1\u6709\u627e\u5230\u95ee\u9898\u6240\u5728\uff0c \u6211\u5df2\u7ecf\u5c1d\u8bd5\u4e86\u4e24\u4e2a\u8868\uff0c\u62f7\u8d1d\u7684\u8868\u5355\u90fd\u662f\u51e0\u79d2\u949f\u5c31\u521b\u5efa\u5b8c\u6210\u4e86\uff01 \u552f\u72ec\u5f00\u53d1\u73af\u5883\u7684\u8868\u6ca1\u6709\u6267\u884c\u6210\u529f\u3002
\n\u76ee\u524d\u552f\u4e00\u80fd\u60f3\u5230\u7684\u529e\u6cd5\u5c31\u662f\u5728\u591c\u6df1\u4eba\u9759\u7684\u65f6\u5019\uff0c\u8fdb\u884c\u505c\u6b62\u670d\u52a1\uff0c\u518d\u6267\u884c\u521b\u5efa\u7d22\u5f15\u64cd\u4f5c\uff0c\u4e5f\u4e0d\u77e5\u9053\u884c\u4e0d\u884c\u3002
\u6709\u6ca1\u6709\u5927\u4f6c\u77e5\u9053 \u4e3a\u5565\u6211\u62f7\u8d1d\u7684\u8868\u6267\u884c\u51e0\u79d2\u949f\u5c31\u6267\u884c\u5b8c\u4e86\u3002
\n", "date_published": "2025-01-08T09:42:52+00:00", "title": "mysql online DDL \u65f6\u95f4\u5f88\u957f\uff0c\u548b\u6574\uff0c\u6570\u636e\u91cf\u4e0d\u591a\uff0c\u5c31 30W", "id": "t/1103619" }, { "author": { "url": "member/xianyukang", "name": "xianyukang", "avatar": "https://cdn.v2ex.com/avatar/4058/eaa6/275106_large.png?m=1732844770" }, "url": "t/1102681", "title": "\u6570\u636e\u5e93\u4e2d select for update \u548c version \u4e50\u89c2\u9501\u5404\u81ea\u7684\u9002\u7528\u573a\u666f\u662f\u5565?", "id": "t/1102681", "date_published": "2025-01-05T08:17:09+00:00", "content_html": "(0) \u5982\u9898
\n(1) \u6bd4\u5982\u8f6c\u8d26/\u6263\u6b3e\u76f8\u5173\u7684\u4e1a\u52a1\uff0c\u63a8\u8350\u7528\u60b2\u89c2\u9501\u8fd8\u662f\u4e50\u89c2\u9501?
\n(2) \u8111\u8865\u4e86\u5982\u4e0b\u7684\u4e50\u89c2\u9501\u5b9e\u73b0\uff0c\u53ef\u4ee5\u6ee1\u8db3\u5e76\u53d1\u8f6c\u8d26\u548c\u53d6\u94b1\u9700\u6c42\u5417?
\n(3) \u5982\u679c\u80fd\uff0c\u90a3\u4e48\u548c\u60b2\u89c2\u9501 select for update \u4f5c\u5bf9\u6bd4\u54ea\u4e2a\u66f4\u597d?
\n# \u6570\u636e\u5e93\u521d\u59cb\u72b6\u6001\nTRUNCATE account;\nINSERT INTO account (id, name, balance, version)\nVALUES (1, 'ichigo', 10, 1),\n (2, 'rukia', 10, 1);\n\n# \u5e76\u53d1\u4e8b\u52a1 1 \u8f6c\u51fa\u5168\u90e8\u4f59\u989d\nSTART TRANSACTION;\nSELECT balance, version FROM account WHERE id = 1;\nSELECT version FROM account WHERE id = 2;\nUPDATE account SET balance = balance - 10, version = 2 WHERE id = 1 AND version = 1;\nUPDATE account SET balance = balance + 10, version = 2 WHERE id = 2 AND version = 1;\nCOMMIT;\n\n# \u5e76\u53d1\u4e8b\u52a1 2 \u53d6\u51fa\u5168\u90e8\u4f59\u989d\nSTART TRANSACTION;\nSELECT balance, version FROM account WHERE id = 1;\nUPDATE account SET balance = balance - 10, version = 2 WHERE id = 1 AND version = 1;\nCOMMIT;\ndocker \u4e2d mysql \u7684\u670d\u52a1\u6b63\u5e38\nroot@Temak:/# docker ps -a\nCONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES\nfa56afd0a5c5 mysql:8.0.20 \"docker-entrypoint.s\u2026\" 57 minutes ago Up 14 minutes 0.0.0.0:3306->3306/tcp, :::3306->3306/tcp, 33060/tcp mysql8\n\u7aef\u53e3 3306 \u4e5f\u6ca1\u6709\u88ab\u5360\u7528\nroot@Temak:/# sudo netstat -tuln | grep 3306\ntcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN
\ntcp6 0 0 :::3306 :::* LISTEN
\n\u5bbf\u4e3b\u673a\nroot@Temak:/# telnet 127.0.0.1 3306\nTrying 127.0.0.1...\nConnected to 127.0.0.1.\nEscape character is '^]'.\n\u4f46\u662f\u5bbf\u4e3b\u673a\u8bbf\u95ee docker \u4e2d\u7684 mysql\nroot@Temak:/# mysql -u root -p -h 127.0.0.1 -P 3306\nEnter password:\nERROR 2013 (HY000): Lost connection to MySQL server at 'reading initial communication packet', system error: 0\ndocker \u4e2d mysql \u7684\u65e5\u5fd7\uff1a\n2025-01-04T02:18:41.937188Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.20) starting as process 1\n2025-01-04T02:18:41.948132Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.\n2025-01-04T02:18:42.188458Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.\n2025-01-04T02:18:42.302034Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Socket: '/var/run/mysqld/mysqlx.sock' bind-address: '::' port: 33060\n2025-01-04T02:18:42.341277Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.\n2025-01-04T02:18:42.342798Z 0 [Warning] [MY-011810] [Server] Insecure configuration for --pid-file: Location '/var/run/mysqld' in the path is accessible to all OS users. Consider choosing a different directory.\n2025-01-04T02:18:42.359459Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.20' socket: '/var/run/mysqld/mysqld.sock' port: 3306 MySQL Community Server - GPL.\n\u8bf7\u95ee\u5927\u795e\u5982\u4f55\u89e3\u51b3\u5bbf\u4e3b\u673a\u8bbf\u95ee docker \u4e2d\u7684 mysql
mysql \u7ecf\u5e38\u7528\u4e00\u6bb5\u65f6\u95f4\u4e4b\u540e\u5f00\u673a\u4e4b\u540e\u65e0\u6cd5\u81ea\u52a8\u5f00\u542f\uff0c\u670d\u52a1\u91cc\u9762\u4e5f\u627e\u4e0d\u5230\uff0c\u53bb\u5b89\u88c5\u76ee\u5f55\u624b\u52a8\u542f\u52a8 mysqld.exe \u548c mysql.exe \u90fd\u662f\u5f39\u51fa\u9ed1\u6846\u540e\u65e0\u4efb\u4f55\u7ffb\u8bd1\uff0c\u7f51\u4e0a\u641c\u4e86\u5f88\u591a\u65b9\u6cd5\uff08\u591a\u662f csdn \u7684\u5e16\u5b50\uff09\u90fd\u4e0d\u7ba1\u7528 \uff0c\u65e0\u5948\u53ea\u80fd\u91cd\u88c5\uff0c\u4f46\u662f\u9694\u4e00\u6bb5\u65f6\u95f4\u5c31\u8fd9\u6837\u5f88\u70e6\u4eba\uff0c\u6709\u5565\u597d\u7684\u89e3\u51b3\u65b9\u6cd5\u5417\uff1f :bili_001: :bili_001: :bili_001:
\n", "date_published": "2024-12-25T14:39:18+00:00", "title": "mysql \u6c42\u52a9", "id": "t/1100311" }, { "author": { "url": "member/vczyh", "name": "vczyh", "avatar": "https://cdn.v2ex.com/avatar/3e9f/06fd/469815_large.png?m=1745658512" }, "url": "t/1099981", "title": "MySQL 8.4 MGR \u53ef\u4ee5\u4e0a\u751f\u4ea7\u5417\uff1f", "id": "t/1099981", "date_published": "2024-12-24T09:15:46+00:00", "content_html": "\u51c6\u5907\u505a\u65b0\u7248\u672c
\n" }, { "author": { "url": "member/woduzibue", "name": "woduzibue", "avatar": "https://cdn.v2ex.com/avatar/b553/5ed8/523033_large.png?m=1735021138" }, "url": "t/1099915", "date_modified": "2024-12-24T23:27:03+00:00", "content_html": "\u8868\u4e2d\u6709\u4e2a\u4ebf\u7ea7\u522b\u7684\u6570\u636e\uff0c\u9700\u8981\u5c06\u8868\u4e2d\u67d0\u4e2a\u5b57\u6bb5\u505a\u5206\u6790\u805a\u5408\u63d2\u5165\u5230\u53e6\u4e00\u5f20\u65b0\u7684\u8868\u4e2d\uff0c\u6211\u516c\u53f8\u6570\u636e\u5e93\u540d\u79f0\u91c7\u7528\u7684\u662f \u5c0f\u5199 + \u4e0b\u5212\u7ebf + \u5c0f\u5199 \u4f8b\u5982 pj0001_prod,\u4f46\u662f\u540c\u4e8b\u63d0\u51fa\u4e86\u5f02\u8bae\u8bf4\u5728\u67d0\u4e9b\u8f6f\u4ef6\u4f7f\u7528\u4e0b\u5212\u7ebf\u4f1a\u51fa\u73b0\u5f02\u5e38(\u95ee\u4e86\u4ed6\u4ec0\u4e48\u8f6f\u4ef6\u53c8\u4e0d\u8bf4).
\u5047\u8bbe\u6709\u4e00\u5f20 software \u8868\uff0c\u8868\u7ed3\u6784\u5982\u4e0b
\n| software_id (int) | \nauthor_id (int) | \ncreate_time | \nupdate_time | \n
|---|---|---|---|
| 1 | \n1 | \n2024-11-05 11:00:00 | \n2024-11-05 11:00:00 | \n
| 2 | \n2 | \n2024-11-05 11:00:00 | \n2024-11-05 11:00:00 | \n
\u5176\u4e2d software_id \u662f\u4e3b\u952e\uff0cauthor_id \u662f\u666e\u901a\u7d22\u5f15
\n\u8fd8\u6709\u4e00\u5f20 company_software \u8868\uff0c\u8868\u7ed3\u6784\u5982\u4e0b
\n| company_software_id (int) | \nauthor_id (int) | \ncountry(varchar) | \nsoftware_id (varchar) | \n
|---|---|---|---|
| 1 | \n1 | \nchina | \n1 | \n
| 2 | \n1 | \nchina | \nkkk | \n
\u5176\u4e2d company_software_id \u662f\u4e3b\u952e\uff0cauthor_id \u3001country \u3001software_id \u662f\u4e00\u4e2a\u590d\u5408\u7d22\u5f15\u3002
\n\u4ee5\u4e0a\u8868\u6570\u636e\u91cf\u53ea\u6709 1~5w \u3002
\n1 \u3001SQL1
\nSELECT 1\nFROM company_software AS company_software\nWHERE company_software.author_id = 1\n and company_software.country in ('china', 'korea', 'england')\n and company_software.software_id = '1'\n\u5e76\u4e0d\u4f1a\u5bfc\u81f4\u6162\u67e5\u8be2
\n2 \u3001SQL2
\nSELECT software_id\nFROM sortware\nWHERE author_id = 1\n and NOT EXISTS (SELECT 1\n FROM company_software AS company_software\n WHERE company_software.author_id = 1\n and company_software.country in ('china', 'korea', 'england')\n and CONVERT(sortware.software_id , char) = company_software.software_id)\nLIMIT 0, 100\n\u4e3a\u4ec0\u4e48\u4f1a\u5bfc\u81f4\u6162\u67e5\u8be2\uff0c\u61c2\u7684\u5927\u4f6c\u5e2e\u5fd9\u5206\u6790\u4e0b
\n" }, { "author": { "url": "member/dzdh", "name": "dzdh", "avatar": "https://cdn.v2ex.com/avatar/1683/7ebf/226307_large.png?m=1757987240" }, "url": "t/1082775", "title": "\u73b0\u5728\u7528 mysql \u7684\u591a \u8fd8\u662f mariadb \u7684\u591a", "id": "t/1082775", "date_published": "2024-10-23T02:05:34+00:00", "content_html": "\u53ea\u80fd\u901a\u8fc7 apt / yum \u5b89\u88c5\u3001\u5347\u7ea7\u3002
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\n", "date_published": "2024-10-12T07:22:37+00:00", "title": "\u8bf7\u6559\u4e2a\u95ee\u9898\uff0c\u5982\u4f55\u5feb\u901f\u7684\u5220\u9664 mysql \u7684\u6570\u636e", "id": "t/1079610" }, { "author": { "url": "member/Gabrielle70", "name": "Gabrielle70", "avatar": "https://cdn.v2ex.com/gravatar/ffb0294f700d2e4fa8a1de41ce6f1e67?s=73&d=retro" }, "url": "t/1078844", "date_modified": "2024-10-10T05:35:29+00:00", "content_html": "\u6211\u7535\u8111 Mysql \u88c5\u5728 C \u76d8, \u4f46\u662f Mysql \u6570\u636e\u6587\u4ef6\u5939\u653e\u5728 D \u76d8.
\n\u73b0\u5728 C \u76d8\u574f\u4e86, \u6211\u6362\u4e86 1 \u5757 C \u76d8\u540e, \u65b0\u88c5\u4e86 1 \u4e2a\u540c\u6837\u7248\u672c\u7684 mysql, \u540c\u65f6\u6307\u5b9a\u6570\u636e\u6587\u4ef6\u5939\u4e3a\u539f\u6765\u7684\u5728 D \u76d8\u4e0a\u7684 Mysql \u6570\u636e\u6587\u4ef6\u5939.
\n\u73b0\u5728\u95ee\u9898\u662f mysqlworkbench \u94fe\u63a5 mysql \u540e\u6b7b\u6d3b\u4e0d\u663e\u793a D \u76d8\u4e0a\u7684\u6570\u636e\u5e93, \u8bf7\u5927\u4f6c\u652f\u62db. \u8c22\u8c22
\n\u8c22\u8c22
\n", "date_published": "2024-10-10T04:59:55+00:00", "title": "\u6c42\u52a9:Mysql \u6570\u636e\u6587\u4ef6\u5939\u5982\u4f55\u88ab\u65b0\u5b89\u88c5\u7684 Mysql \u8bfb\u53d6", "id": "t/1078844" }, { "author": { "url": "member/blacklinux", "name": "blacklinux", "avatar": "https://cdn.v2ex.com/avatar/177f/9e78/133075_large.png?m=1690126853" }, "url": "t/1076510", "date_modified": "2024-09-28T11:07:23+00:00", "content_html": "\u60f3\u8981\u8ba9\u4e00\u4e2a mysql \u7684\u5e93\u80fd\u7528 mongodb \u7684\u5ba2\u6237\u7aef\u53bb\u8fde\u63a5\u5e76\u80fd\u7b80\u5355\u7684\u67e5\u8be2
\n", "date_published": "2024-09-28T03:52:51+00:00", "title": "mysql \u6709\u6ca1\u6709\u4ec0\u4e48\u4e2d\u95f4\u4ef6\u80fd\u6a21\u62df mongodb?", "id": "t/1076510" }, { "author": { "url": "member/BeforeTooLate", "name": "BeforeTooLate", "avatar": "https://cdn.v2ex.com/avatar/0dae/9391/455039_large.png?m=1769153923" }, "url": "t/1076483", "date_modified": "2024-09-28T11:07:25+00:00", "content_html": "\u901a\u8fc7\u6dfb\u52a0 apt \u6e90\uff0c\u8c8c\u4f3c\u53ea\u80fd\u6309\u7167 mysql8 \u4e86\uff1f