{"id":96274,"date":"2024-10-20T08:03:15","date_gmt":"2024-10-20T00:03:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/96274\/"},"modified":"2024-10-20T08:03:16","modified_gmt":"2024-10-20T00:03:16","slug":"oracle%e5%b0%88%e5%ae%b6%e8%aa%bf%e5%84%aa%e7%a7%98%e5%af%86","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/96274\/","title":{"rendered":"Oracle\u5c08\u5bb6\u8abf\u512a\u79d8\u5bc6"},"content":{"rendered":"

Oracle\u5c08\u5bb6\u8abf\u512a\u79d8\u5bc6<\/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\u3002Oracle\u6578\u64da\u5eab\u4f5c\u70ba\u5e02\u5834\u4e0a\u6700\u53d7\u6b61\u8fce\u7684\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e4b\u4e00\uff0c\u5176\u8abf\u512a\u6280\u8853\u66f4\u662f\u6210\u70ba\u4e86\u8a31\u591a\u4f01\u696dIT\u5c08\u5bb6\u7684\u7814\u7a76\u91cd\u9ede\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u4e00\u4e9bOracle\u5c08\u5bb6\u5728\u6578\u64da\u5eab\u8abf\u512a\u904e\u7a0b\u4e2d\u7684\u79d8\u5bc6\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u5982\u4f55\u63d0\u5347Oracle\u6578\u64da\u5eab\u7684\u6027\u80fd\u3002<\/p>\n

1. \u7406\u89e3\u57f7\u884c\u8a08\u5283<\/h2>\n

\u57f7\u884c\u8a08\u5283\u662fOracle\u6578\u64da\u5eab\u5728\u57f7\u884cSQL\u67e5\u8a62\u6642\u6240\u63a1\u7528\u7684\u8def\u5f91\u3002\u900f\u904e\u5206\u6790\u57f7\u884c\u8a08\u5283\uff0c\u5c08\u5bb6\u53ef\u4ee5\u8b58\u5225\u51fa\u6027\u80fd\u74f6\u9838\u3002\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\u53ef\u4ee5\u67e5\u770b\u57f7\u884c\u8a08\u5283\uff1a<\/p>\n

EXPLAIN PLAN FOR \nSELECT * FROM employees WHERE department_id = 10;<\/code><\/pre>\n
\u57f7\u884c\u8a08\u5283\u7684\u5206\u6790\u53ef\u4ee5\u5e6b\u52a9\u5c08\u5bb6\u4e86\u89e3\u67e5\u8a62\u7684\u6548\u7387\uff0c\u4e26\u6839\u64da\u9700\u8981\u9032\u884c\u7d22\u5f15\u7684\u8abf\u6574\u6216\u67e5\u8a62\u7684\u91cd\u5beb\u3002<\/p>\n
2. \u7d22\u5f15\u7684\u4f7f\u7528<\/h2>\n
\u7d22\u5f15\u662f\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u7684\u95dc\u9375\u3002\u5c08\u5bb6\u5efa\u8b70\u5728\u7d93\u5e38\u67e5\u8a62\u7684\u5217\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u4f46\u904e\u591a\u7684\u7d22\u5f15\u6703\u5f71\u97ff\u6578\u64da\u7684\u5beb\u5165\u6027\u80fd\u3002\u56e0\u6b64\uff0c\u5408\u7406\u7684\u7d22\u5f15\u7b56\u7565\u81f3\u95dc\u91cd\u8981\u3002\u4ee5\u4e0b\u662f\u5275\u5efa\u7d22\u5f15\u7684\u57fa\u672c\u8a9e\u6cd5\uff1a<\/p>\n
CREATE INDEX idx_department ON employees(department_id);<\/code><\/pre>\n
\u6b64\u5916\uff0c\u5c08\u5bb6\u9084\u5efa\u8b70\u5b9a\u671f\u6aa2\u67e5\u548c\u91cd\u5efa\u7d22\u5f15\uff0c\u4ee5\u78ba\u4fdd\u5176\u6027\u80fd\u6700\u4f73\u3002<\/p>\n
3. \u53c3\u6578\u8abf\u6574<\/h2>\n
Oracle\u6578\u64da\u5eab\u6709\u8a31\u591a\u53ef\u8abf\u6574\u7684\u53c3\u6578\uff0c\u9019\u4e9b\u53c3\u6578\u53ef\u4ee5\u5f71\u97ff\u6578\u64da\u5eab\u7684\u6027\u80fd\u3002\u4f8b\u5982\uff0cSGA<\/code>\uff08\u7cfb\u7d71\u5168\u5c40\u5340\uff09\u548cPGA<\/code>\uff08\u7a0b\u5e8f\u5168\u5c40\u5340\uff09\u7684\u5927\u5c0f\u53ef\u4ee5\u5f71\u97ff\u6578\u64da\u5eab\u7684\u7de9\u5b58\u6027\u80fd\u3002\u5c08\u5bb6\u901a\u5e38\u6703\u6839\u64da\u5be6\u969b\u7684\u5de5\u4f5c\u8ca0\u8f09\u4f86\u8abf\u6574\u9019\u4e9b\u53c3\u6578\u3002\u4ee5\u4e0b\u662f\u8abf\u6574SGA<\/code>\u7684\u793a\u4f8b\uff1a<\/p>\n
ALTER SYSTEM SET SGA_TARGET = 2G;<\/code><\/pre>\n
4. SQL\u67e5\u8a62\u512a\u5316<\/h2>\n
\u512a\u5316SQL\u67e5\u8a62\u662f\u63d0\u5347\u6027\u80fd\u7684\u53e6\u4e00\u500b\u91cd\u8981\u65b9\u9762\u3002\u5c08\u5bb6\u5efa\u8b70\u4f7f\u7528\u7c21\u55ae\u7684\u67e5\u8a62\u7d50\u69cb\uff0c\u907f\u514d\u4f7f\u7528\u904e\u591a\u7684\u5b50\u67e5\u8a62\u548c\u806f\u63a5\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u512a\u5316\u7684\u67e5\u8a62\u793a\u4f8b\uff1a<\/p>\n
SELECT first_name, last_name \nFROM employees \nWHERE department_id = 10 \nORDER BY last_name;<\/code><\/pre>\n
\u6b64\u5916\uff0c\u4f7f\u7528JOIN<\/code>\u800c\u975eSUBQUERY<\/code>\u901a\u5e38\u80fd\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002<\/p>\n
5. \u76e3\u63a7\u548c\u8abf\u8a66<\/h2>\n
\u6301\u7e8c\u7684\u76e3\u63a7\u548c\u8abf\u8a66\u662f\u78ba\u4fdd\u6578\u64da\u5eab\u6027\u80fd\u7684\u95dc\u9375\u3002Oracle\u63d0\u4f9b\u4e86\u591a\u7a2e\u5de5\u5177\uff0c\u5982AWR<\/code>\uff08\u81ea\u52d5\u5de5\u4f5c\u8ca0\u8f09\u5831\u544a\uff09\u548cASH<\/code>\uff08\u6d3b\u52d5\u6703\u8a71\u6b77\u53f2\uff09\uff0c\u5e6b\u52a9\u5c08\u5bb6\u5206\u6790\u6027\u80fd\u554f\u984c\u3002\u5b9a\u671f\u751f\u6210\u9019\u4e9b\u5831\u544a\u53ef\u4ee5\u5e6b\u52a9\u8b58\u5225\u6f5b\u5728\u7684\u6027\u80fd\u74f6\u9838\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
Oracle\u6578\u64da\u5eab\u7684\u8abf\u512a\u662f\u4e00\u500b\u8907\u96dc\u800c\u6301\u7e8c\u7684\u904e\u7a0b\uff0c\u6d89\u53ca\u57f7\u884c\u8a08\u5283\u5206\u6790\u3001\u7d22\u5f15\u4f7f\u7528\u3001\u53c3\u6578\u8abf\u6574\u3001SQL\u67e5\u8a62\u512a\u5316\u4ee5\u53ca\u6301\u7e8c\u76e3\u63a7\u7b49\u591a\u500b\u65b9\u9762\u3002\u900f\u904e\u9019\u4e9b\u5c08\u5bb6\u7684\u8abf\u512a\u79d8\u5bc6\uff0c\u4f01\u696d\u53ef\u4ee5\u986f\u8457\u63d0\u5347\u5176\u6578\u64da\u5eab\u7684\u6027\u80fd\uff0c\u5f9e\u800c\u652f\u6301\u696d\u52d9\u7684\u589e\u9577\u548c\u767c\u5c55\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u89e3\u6c7a\u65b9\u6848\u4f86\u7ba1\u7406\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\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22Oracle\u5c08\u5bb6\u8abf\u512a\u7684\u79d8\u5bc6\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\uff0c\u512a\u5316\u67e5\u8a62\u6548\u7387\uff0c\u5be6\u73fe\u9ad8\u6548\u7ba1\u7406\u8207\u904b\u884c\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-96274","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96274","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"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=96274"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96274\/revisions"}],"predecessor-version":[{"id":96275,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96274\/revisions\/96275"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=96274"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=96274"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=96274"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}