{"id":15521,"date":"2025-01-07T16:57:56","date_gmt":"2025-01-07T08:57:56","guid":{"rendered":"https:\/\/nj.transwarp.cn:8180\/?p=15521"},"modified":"2025-06-27T15:52:02","modified_gmt":"2025-06-27T07:52:02","slug":"%e5%88%86%e5%b8%83%e5%bc%8fkundb%e6%89%a7%e8%a1%8cddl%e5%8d%a1%e4%bd%8f","status":"publish","type":"post","link":"https:\/\/kbwp.transwarp.cn\/?p=15521","title":{"rendered":"\u5206\u5e03\u5f0fkundb\u6267\u884cDDL\u5361\u4f4f"},"content":{"rendered":"<h3>\u6982\u8981\u63cf\u8ff0<\/h3>\n<hr \/>\n<p>\u672c\u6587\u4e3b\u8981\u4ecb\u7ecd\uff0c\u5206\u5e03\u5f0fKUNDB\u4e0b\uff0c\u5982\u4f55\u4fdd\u8bc1\u5143\u6570\u636e\u64cd\u4f5c\uff0c\u6740\u6389\u524d\u7f6e\u4e8b\u52a1\u3002<\/p>\n<h3>\u573a\u666f\u6784\u9020<\/h3>\n<hr \/>\n<p><strong>session1:<\/strong><\/p>\n<p>KUNDB\u5bf9DML\u9ed8\u8ba4\u662f\u81ea\u52a8\u63d0\u4ea4\u7684\uff0c\u56e0\u6b64\u6bcf\u6761DML\u8bed\u53e5\u90fd\u662f\u72ec\u7acb\u4e8b\u52a1\uff0c\u5f53\u8bed\u53e5\u6267\u884c\u5b8c\uff0c\u5143\u6570\u636e\u9501\u5c31\u91ca\u653e\u4e86\uff0c\u8fd9\u91cc\u901a\u8fc7<code>begin<\/code>\u663e\u5f0f\u5f00\u542f\u4e8b\u52a1\uff0c\u8ba9<code>select<\/code>\u8bed\u53e5\u6267\u884c\u5b8c\u540e\uff0c\u4e8b\u52a1\u4f9d\u7136\u5b58\u5728<\/p>\n<pre><code class=\"language-sql\">create table lkw.t1 (id int primary key auto_increment);\nbegin;\nselect * from lkw.t1;<\/code><\/pre>\n<p><strong>session2:<\/strong><\/p>\n<p>\u53e6\u542f\u52a8\u4e00\u4e2a\u4f1a\u8bdd2\uff0c\u6267\u884c\u4e0b\u9762DDL\u8bed\u53e5\uff0c\u53ef\u4ee5\u53d1\u73b0\u5176\u88ab\u963b\u585e\uff08\u4f1a\u8bdd\u8fdf\u8fdf\u4e0d\u8fd4\u56de\uff09\uff1a<br \/>\nDDL\u5728\u6267\u884c\u524d\u4f1a\u9690\u5f0f\u63d0\u4ea4\u4e8b\u52a1\u5e76\u91ca\u653e\u5143\u6570\u636e\u9501\uff0c\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u8981\u53e6\u4e00\u4e2a\u4f1a\u8bdd\u53d1\u8d77DDL\u3002<\/p>\n<pre><code class=\"language-sql\">alter table lkw.t1 add name varchar(16);<\/code><\/pre>\n<p><strong>session3\uff1a<\/strong><br \/>\n\u542f\u52a8\u4f1a\u8bdd3\uff0c\u6267\u884c<code>show processlist;<\/code> \u6216\u8005 <code>select * from information_schema.processlist where command &lt;&gt;&#039;Sleep&#039; order by time desc;<\/code> \u547d\u4ee4\uff0c\u5373\u53ef\u770b\u5230\u4f1a\u8bdd2\u5728\u7b49\u5f85\u5143\u6570\u636e\u9501\uff08<code>Waiting for table metadata lock<\/code>\uff09\uff1a<\/p>\n<p><img decoding=\"async\" src=\"\/wp-content\/uploads\/2025\/01\/image-1736238514922.png\" alt=\"file\" \/><\/p>\n<h3>\u89e3\u51b3\u65b9\u6848<\/h3>\n<hr \/>\n<p>KUNDB\u63d0\u4f9b\u4e86<code>performance_schema.metadata_locks<\/code>\u7528\u6765\u67e5\u8be2\u5177\u4f53\u5143\u6570\u636e\u9501\u4fe1\u606f\uff0c\u4e14\u9ed8\u8ba4\u5c31\u6253\u5f00\u4e86\u5143\u6570\u636e\u9501\u7684\u4fe1\u606f\u6536\u96c6\uff0c\u76f4\u63a5\u67e5\u8be2\u5373\u53ef\u3002\u8868\u4e2d\u5305\u542b\u4e86\u6301\u6709\uff0c\u7b49\u5f85\u53ca\u5176\u4ed6\u4e2d\u95f4\u72b6\u6001\u7684MDL\u6570\u636e\uff0c\u5f53\u9501\u91ca\u653e\u65f6\uff0c\u4f1a\u4ece\u8868\u4e2d\u5220\u9664\u3002<\/p>\n<p>\u901a\u8fc7\u5982\u4e0b sql \u6784\u9020<code>kill\u547d\u4ee4<\/code><\/p>\n<pre><code class=\"language-sql\">select \n    concat('KILL ',PROCESSLIST_ID,';')  as kill_sql \nfrom performance_schema.threads \nwhere thread_id in(select OWNER_THREAD_ID from performance_schema.metadata_locks)\nand PROCESSLIST_COMMAND=\"Sleep\";<\/code><\/pre>\n<p>\u590d\u5236\u51fa\u6765\uff0c\u51c6\u5907\u5728\u6bcf\u4e2ashard master \u5e95\u5c42\u6267\u884c<\/p>\n<p><img decoding=\"async\" src=\"\/wp-content\/uploads\/2025\/01\/image-1736236997414.png\" alt=\"file\" \/><\/p>\n<p>\u901a\u8fc7kungate\u9875\u9762\uff0c\u83b7\u53d6\u6bcf\u4e2ashard\u7684master\u8282\u70b9\uff08\u9f20\u6807\u60ac\u505c\u5230MASTER\u7684103\u8282\u70b9\u53ef\u4ee5\u770b\u5230hostname\uff09<\/p>\n<p><img decoding=\"async\" src=\"\/wp-content\/uploads\/2025\/01\/image-1736237127604.png\" alt=\"file\" \/><\/p>\n<p><img decoding=\"async\" src=\"\/wp-content\/uploads\/2025\/01\/image-1736237158005.png\" alt=\"file\" \/><\/p>\n<p>\u8fdb\u5165\u5230\u5bf9\u5e94shard1\u7684pod\u5185\uff0c\u901a\u8fc7socket\u8fde\u63a5mysqld\uff0c\u6267\u884ckill\u547d\u4ee4<\/p>\n<p><img decoding=\"async\" src=\"\/wp-content\/uploads\/2025\/01\/image-1736237110029.png\" alt=\"file\" \/><\/p>\n<p>\u5982\u679c\u6709\u591a\u4e2ashard\uff0c\u7ee7\u7eed\u6267\u884c\u4e0a\u8ff0\u64cd\u4f5c\uff08\u786e\u8ba4\u6bcf\u4e2ashardN\u7684shard master\u7684hostname\uff0c\u8fdb\u5165kuntablet-shardN pod\uff0c\u6267\u884csql\uff09<\/p>\n<p><strong>\u64cd\u4f5c\u6267\u884c\u5b8c\u4e4b\u540e\uff0cname\u5217\u88ab\u6210\u529f\u6dfb\u52a0\uff0csession1\u7684\u4e8b\u52a1\u4f1a\u88ab\u6740\u6389\u3002<\/strong><\/p>\n<h3>FAQ<\/h3>\n<hr \/>\n<p>\u8fdb\u4e00\u6b65\u7684\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u5bb9\u5668\u6620\u5c04\u7684\u672c\u5730\u76ee\u5f55\uff08\u6bd4\u5982 \/mnt\/disk1\/kundb3\/shard1\/kundbdata\/\uff0c\u5bf9\u5e94\u5bb9\u5668\u5185\u7684\/vdir\/mnt\/disk1\/kundb3\/shard1\/kundbdata \uff09\uff0c\u90e8\u7f72\u5982\u4e0b\u811a\u672c\uff0c\u540e\u9762\u9047\u5230\u8be5\u95ee\u9898\uff0c\u8fdb\u5165\u6bcf\u4e2ashard master\u7684 pod\u5185 \u6267\u884c\u8be5\u811a\u672c\u5373\u53ef\u3002<\/p>\n<blockquote>\n<p>\u53ef\u4ee5\u5728\u6bcf\u4e2ashard\u7684\u672c\u5730\u5316\u76ee\u5f55\u90fd\u90e8\u7f72\u4e00\u4efd\uff0c\u9632\u6b62\u56e0shard master\u5207\u6362\u5bfc\u81f4\u9700\u8981\u518d\u6b21\u90e8\u7f72<br \/>\n\u4ea6\u6216\u8005\u8d70\u76f4\u8fde\u5e95\u5c42\u7684\u65b9\u5f0f \u5728\u5916\u9762\u6267\u884c<\/p>\n<\/blockquote>\n<pre><code class=\"language-shell\">#!\/bin\/bash\n\n# MySQL socket file path\nSOCKET=\"\/vdir\/mnt\/disk1\/kundb3\/shard1\/kundbdata\/mysql.sock\"\n\n# Step 1: Generate the KILL SQL statements\nKILL_SQL=$(mysql -S \"$SOCKET\" -N -e \"\n  SELECT CONCAT('KILL ', PROCESSLIST_ID, ';') AS kill_sql\n  FROM performance_schema.threads\n  WHERE thread_id IN (\n    SELECT OWNER_THREAD_ID\n    FROM performance_schema.metadata_locks\n  ) AND PROCESSLIST_COMMAND='Sleep';\n\")\n\n# Step 2: Execute the generated KILL SQL statements\nif [ -n \"$KILL_SQL\" ]; then\n  echo \"Executing KILL statements:\"\n  echo \"$KILL_SQL\" | mysql -S \"$SOCKET\"\n  echo \"KILLED SUCCESS !\"\nelse\n  echo \"No KILL statements generated.\"\nfi\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u6982\u8981\u63cf\u8ff0 \u672c\u6587\u4e3b\u8981\u4ecb\u7ecd\uff0c\u5206\u5e03\u5f0fKUNDB\u4e0b\uff0c\u5982\u4f55\u4fdd\u8bc1\u5143\u6570\u636e\u64cd\u4f5c\uff0c\u6740\u6389\u524d\u7f6e\u4e8b\u52a1\u3002 \u573a\u666f\u6784\u9020 session1:  ..<\/p>\n<div class=\"clear-fix\"><\/div>\n<p><a href=\"https:\/\/kbwp.transwarp.cn\/?p=15521\" title=\"read more...\">Read more<\/a><\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-15521","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"acf":[],"_links":{"self":[{"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/posts\/15521","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/users\/12"}],"replies":[{"embeddable":true,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=15521"}],"version-history":[{"count":3,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/posts\/15521\/revisions"}],"predecessor-version":[{"id":16811,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/posts\/15521\/revisions\/16811"}],"wp:attachment":[{"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=15521"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=15521"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=15521"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}