{"id":60849,"date":"2024-10-13T06:19:14","date_gmt":"2024-10-12T22:19:14","guid":{"rendered":"https:\/\/server.hk\/cnblog\/60849\/"},"modified":"2024-10-13T06:19:14","modified_gmt":"2024-10-12T22:19:14","slug":"db2%e6%95%b8%e6%93%9a%e5%ba%ab%e5%84%aa%e5%8c%96%e4%b8%ad%e5%93%aa%e4%ba%9b%e7%ad%96%e7%95%a5%e6%98%af%e5%bf%85%e9%a0%88%e6%8e%8c%e6%8f%a1%e7%9a%84%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/60849\/","title":{"rendered":"DB2\u6578\u64da\u5eab\u512a\u5316\u4e2d\u54ea\u4e9b\u7b56\u7565\u662f\u5fc5\u9808\u638c\u63e1\u7684\uff1f"},"content":{"rendered":"

DB2\u6578\u64da\u5eab\u512a\u5316\u4e2d\u54ea\u4e9b\u7b56\u7565\u662f\u5fc5\u9808\u638c\u63e1\u7684\uff1f<\/h1>\n

\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u6027\u80fd\u5c0d\u65bc\u4f01\u696d\u7684\u6210\u529f\u81f3\u95dc\u91cd\u8981\u3002IBM\u7684DB2\u6578\u64da\u5eab\u662f\u4e00\u500b\u5f37\u5927\u7684\u95dc\u4fc2\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u884c\u696d\u3002\u70ba\u4e86\u78ba\u4fddDB2\u6578\u64da\u5eab\u7684\u9ad8\u6548\u904b\u884c\uff0c\u638c\u63e1\u4e00\u4e9b\u512a\u5316\u7b56\u7565\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5e7e\u500b\u95dc\u9375\u7684DB2\u6578\u64da\u5eab\u512a\u5316\u7b56\u7565\u3002<\/p>\n

1. \u67e5\u8a62\u512a\u5316<\/h2>\n

\u67e5\u8a62\u512a\u5316\u662fDB2\u6578\u64da\u5eab\u6027\u80fd\u63d0\u5347\u7684\u9996\u8981\u6b65\u9a5f\u3002\u901a\u904e\u5206\u6790\u67e5\u8a62\u8a08\u5283\uff0c\u53ef\u4ee5\u627e\u51fa\u6027\u80fd\u74f6\u9838\u3002DB2\u63d0\u4f9b\u4e86\u591a\u7a2e\u5de5\u5177\u4f86\u5e6b\u52a9\u7528\u6236\u5206\u6790\u67e5\u8a62\u6027\u80fd\uff0c\u4f8b\u5982EXPLAIN\u547d\u4ee4\u3002\u4f7f\u7528EXPLAIN\u53ef\u4ee5\u67e5\u770b\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\uff0c\u4e26\u6839\u64da\u8a08\u5283\u8abf\u6574\u67e5\u8a62\u8a9e\u53e5\u3002<\/p>\n

EXPLAIN PLAN FOR\nSELECT * FROM employees WHERE department = 'Sales';\n<\/code><\/pre>\n
\u6b64\u5916\uff0c\u4f7f\u7528\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u78ba\u4fdd\u5728\u7d93\u5e38\u67e5\u8a62\u7684\u5217\u4e0a\u5275\u5efa\u9069\u7576\u7684\u7d22\u5f15\uff0c\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u67e5\u8a62\u7684\u57f7\u884c\u6642\u9593\u3002<\/p>\n
2. \u6578\u64da\u5eab\u8a2d\u8a08<\/h2>\n
\u826f\u597d\u7684\u6578\u64da\u5eab\u8a2d\u8a08\u662f\u512a\u5316\u7684\u57fa\u790e\u3002\u78ba\u4fdd\u6578\u64da\u5eab\u7684\u6b63\u898f\u5316\u7a0b\u5ea6\u9069\u4e2d\uff0c\u907f\u514d\u904e\u5ea6\u6b63\u898f\u5316\u6216\u4e0d\u6b63\u898f\u5316\u3002\u904e\u5ea6\u6b63\u898f\u5316\u53ef\u80fd\u5c0e\u81f4\u67e5\u8a62\u904e\u65bc\u8907\u96dc\uff0c\u800c\u4e0d\u6b63\u898f\u5316\u5247\u53ef\u80fd\u5c0e\u81f4\u6578\u64da\u5197\u9918\u3002<\/p>\n
\u6b64\u5916\uff0c\u8003\u616e\u4f7f\u7528\u5206\u5340\u8868\u4f86\u7ba1\u7406\u5927\u578b\u6578\u64da\u96c6\u3002\u5206\u5340\u53ef\u4ee5\u6839\u64da\u67d0\u4e9b\u689d\u4ef6\uff08\u5982\u65e5\u671f\u6216\u5730\u7406\u4f4d\u7f6e\uff09\u5c07\u6578\u64da\u5206\u6563\u5230\u4e0d\u540c\u7684\u7269\u7406\u5340\u57df\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002<\/p>\n
3. \u8a2d\u7f6e\u9069\u7576\u7684\u7de9\u885d\u5340<\/h2>\n
DB2\u4f7f\u7528\u7de9\u885d\u5340\u4f86\u63d0\u9ad8I\/O\u6027\u80fd\u3002\u9069\u7576\u7684\u7de9\u885d\u5340\u8a2d\u7f6e\u53ef\u4ee5\u6e1b\u5c11\u78c1\u789fI\/O\u64cd\u4f5c\u7684\u6b21\u6578\uff0c\u5f9e\u800c\u63d0\u9ad8\u6574\u9ad4\u6027\u80fd\u3002\u7528\u6236\u53ef\u4ee5\u6839\u64da\u7cfb\u7d71\u7684\u5167\u5b58\u5927\u5c0f\u548c\u5de5\u4f5c\u8ca0\u8f09\u4f86\u8abf\u6574\u7de9\u885d\u5340\u7684\u5927\u5c0f\u3002<\/p>\n
UPDATE DB CFG USING DBDHEAP 20000;\n<\/code><\/pre>\n
\u6b64\u5916\uff0c\u5b9a\u671f\u76e3\u63a7\u7de9\u885d\u5340\u7684\u4f7f\u7528\u60c5\u6cc1\uff0c\u78ba\u4fdd\u5176\u4e0d\u6703\u6210\u70ba\u6027\u80fd\u74f6\u9838\u3002<\/p>\n
4. \u5b9a\u671f\u7dad\u8b77<\/h2>\n
\u5b9a\u671f\u7dad\u8b77\u662f\u78ba\u4fddDB2\u6578\u64da\u5eab\u9ad8\u6548\u904b\u884c\u7684\u91cd\u8981\u6b65\u9a5f\u3002\u9019\u5305\u62ec\u91cd\u7d44\u8868\u3001\u66f4\u65b0\u7d71\u8a08\u4fe1\u606f\u548c\u6e05\u7406\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u3002\u91cd\u7d44\u8868\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u800c\u66f4\u65b0\u7d71\u8a08\u4fe1\u606f\u5247\u53ef\u4ee5\u5e6b\u52a9\u67e5\u8a62\u512a\u5316\u5668\u751f\u6210\u66f4\u597d\u7684\u57f7\u884c\u8a08\u5283\u3002<\/p>\n
RUNSTATS ON TABLE employees;\n<\/code><\/pre>\n
\u6b64\u5916\uff0c\u5b9a\u671f\u6aa2\u67e5\u548c\u6e05\u7406\u904e\u671f\u6216\u4e0d\u518d\u4f7f\u7528\u7684\u6578\u64da\uff0c\u53ef\u4ee5\u91cb\u653e\u5b58\u5132\u7a7a\u9593\uff0c\u5f9e\u800c\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n
5. \u76e3\u63a7\u548c\u8abf\u6574<\/h2>\n
\u6301\u7e8c\u76e3\u63a7\u6578\u64da\u5eab\u6027\u80fd\u662f\u512a\u5316\u904e\u7a0b\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\u3002\u4f7f\u7528DB2\u7684\u6027\u80fd\u76e3\u63a7\u5de5\u5177\uff0c\u53ef\u4ee5\u5be6\u6642\u8ddf\u8e64\u6578\u64da\u5eab\u7684\u6027\u80fd\u6307\u6a19\uff0c\u5982CPU\u4f7f\u7528\u7387\u3001\u5167\u5b58\u4f7f\u7528\u60c5\u6cc1\u548cI\/O\u6027\u80fd\u3002\u6839\u64da\u9019\u4e9b\u6307\u6a19\uff0c\u53ca\u6642\u8abf\u6574\u6578\u64da\u5eab\u914d\u7f6e\uff0c\u4ee5\u61c9\u5c0d\u4e0d\u65b7\u8b8a\u5316\u7684\u5de5\u4f5c\u8ca0\u8f09\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
DB2\u6578\u64da\u5eab\u7684\u512a\u5316\u662f\u4e00\u500b\u6301\u7e8c\u7684\u904e\u7a0b\uff0c\u6d89\u53ca\u67e5\u8a62\u512a\u5316\u3001\u6578\u64da\u5eab\u8a2d\u8a08\u3001\u7de9\u885d\u5340\u8a2d\u7f6e\u3001\u5b9a\u671f\u7dad\u8b77\u548c\u6027\u80fd\u76e3\u63a7\u7b49\u591a\u500b\u65b9\u9762\u3002\u638c\u63e1\u9019\u4e9b\u7b56\u7565\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8DB2\u6578\u64da\u5eab\u7684\u6027\u80fd\uff0c\u5f9e\u800c\u652f\u6301\u4f01\u696d\u7684\u696d\u52d9\u9700\u6c42\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u89e3\u6c7a\u65b9\u6848\u4f86\u6258\u7ba1\u60a8\u7684\u6578\u64da\u5eab\uff0c\u8003\u616e\u4f7f\u7528\u9999\u6e2fVPS<\/a>\u6216\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\uff0c\u4ee5\u7372\u5f97\u66f4\u597d\u7684\u6027\u80fd\u548c\u53ef\u9760\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u638c\u63e1DB2\u6578\u64da\u5eab\u512a\u5316\u7684\u5fc5\u5099\u7b56\u7565\uff0c\u5305\u62ec\u7d22\u5f15\u7ba1\u7406\u3001\u67e5\u8a62\u512a\u5316\u3001\u6027\u80fd\u76e3\u63a7\u53ca\u8cc7\u6e90\u914d\u7f6e\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-60849","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60849","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=60849"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60849\/revisions"}],"predecessor-version":[{"id":60850,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60849\/revisions\/60850"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=60849"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=60849"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=60849"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}