{"id":60905,"date":"2024-10-13T06:48:28","date_gmt":"2024-10-12T22:48:28","guid":{"rendered":"https:\/\/server.hk\/cnblog\/60905\/"},"modified":"2024-10-13T06:48:28","modified_gmt":"2024-10-12T22:48:28","slug":"db2%e7%b4%a2%e5%bc%95%e9%a1%9e%e5%9e%8b%e4%bb%8b%e7%b4%b9","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/60905\/","title":{"rendered":"DB2\u7d22\u5f15\u985e\u578b\u4ecb\u7d39"},"content":{"rendered":"

DB2\u7d22\u5f15\u985e\u578b\u4ecb\u7d39<\/h1>\n

\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u7d22\u5f15\u662f\u4e00\u7a2e\u91cd\u8981\u7684\u8cc7\u6599\u7d50\u69cb\uff0c\u80fd\u5920\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002IBM\u7684DB2\u8cc7\u6599\u5eab\u7cfb\u7d71\u63d0\u4f9b\u4e86\u591a\u7a2e\u7d22\u5f15\u985e\u578b\uff0c\u4ee5\u6eff\u8db3\u4e0d\u540c\u7684\u61c9\u7528\u9700\u6c42\u3002\u672c\u6587\u5c07\u4ecb\u7d39DB2\u4e2d\u7684\u4e3b\u8981\u7d22\u5f15\u985e\u578b\u53ca\u5176\u7279\u9ede\u3002<\/p>\n

1. \u55ae\u5217\u7d22\u5f15<\/h2>\n

\u55ae\u5217\u7d22\u5f15\u662f\u6700\u57fa\u672c\u7684\u7d22\u5f15\u985e\u578b\uff0c\u91dd\u5c0d\u8cc7\u6599\u8868\u4e2d\u7684\u55ae\u4e00\u5217\u9032\u884c\u7d22\u5f15\u3002\u9019\u7a2e\u7d22\u5f15\u9069\u5408\u65bc\u67e5\u8a62\u4e2d\u7d93\u5e38\u4f7f\u7528\u7684\u5217\uff0c\u80fd\u5920\u52a0\u901f\u67e5\u8a62\u6027\u80fd\u3002<\/p>\n

CREATE INDEX idx_column_name ON table_name(column_name);<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u82e5\u6709\u4e00\u500b\u540d\u70ba\u201ccustomers\u201d\u7684\u8cc7\u6599\u8868\uff0c\u4e26\u4e14\u7d93\u5e38\u6839\u64da\u201ccustomer_id\u201d\u9032\u884c\u67e5\u8a62\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\u5275\u5efa\u55ae\u5217\u7d22\u5f15\uff1a<\/p>\n
CREATE INDEX idx_customer_id ON customers(customer_id);<\/code><\/pre>\n
2. \u8907\u5408\u7d22\u5f15<\/h2>\n
\u8907\u5408\u7d22\u5f15\u662f\u91dd\u5c0d\u591a\u500b\u5217\u9032\u884c\u7d22\u5f15\u7684\u985e\u578b\u3002\u7576\u67e5\u8a62\u4e2d\u6d89\u53ca\u591a\u500b\u5217\u6642\uff0c\u8907\u5408\u7d22\u5f15\u80fd\u5920\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/p>\n
CREATE INDEX idx_multiple_columns ON table_name(column1, column2);<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u82e5\u9700\u8981\u6839\u64da\u201clast_name\u201d\u548c\u201cfirst_name\u201d\u9032\u884c\u67e5\u8a62\uff0c\u53ef\u4ee5\u5275\u5efa\u8907\u5408\u7d22\u5f15\uff1a<\/p>\n
CREATE INDEX idx_name ON customers(last_name, first_name);<\/code><\/pre>\n
3. \u552f\u4e00\u7d22\u5f15<\/h2>\n
\u552f\u4e00\u7d22\u5f15\u78ba\u4fdd\u7d22\u5f15\u5217\u4e2d\u7684\u6bcf\u500b\u503c\u90fd\u662f\u552f\u4e00\u7684\uff0c\u9019\u5c0d\u65bc\u4fdd\u6301\u8cc7\u6599\u5b8c\u6574\u6027\u975e\u5e38\u91cd\u8981\u3002\u7576\u5617\u8a66\u63d2\u5165\u91cd\u8907\u503c\u6642\uff0c\u8cc7\u6599\u5eab\u6703\u8fd4\u56de\u932f\u8aa4\u3002<\/p>\n
CREATE UNIQUE INDEX idx_unique_email ON customers(email);<\/code><\/pre>\n
\u5728\u4e0a\u8ff0\u4f8b\u5b50\u4e2d\uff0c\u82e5\u201cemail\u201d\u5217\u9700\u8981\u4fdd\u6301\u552f\u4e00\u6027\uff0c\u53ef\u4ee5\u4f7f\u7528\u552f\u4e00\u7d22\u5f15\u4f86\u5be6\u73fe\u3002<\/p>\n
4. \u805a\u96c6\u7d22\u5f15<\/h2>\n
\u805a\u96c6\u7d22\u5f15\u662f\u5c07\u8cc7\u6599\u8868\u4e2d\u7684\u8cc7\u6599\u884c\u6309\u7167\u7d22\u5f15\u7684\u9806\u5e8f\u5b58\u5132\u3002\u6bcf\u500b\u8cc7\u6599\u8868\u53ea\u80fd\u6709\u4e00\u500b\u805a\u96c6\u7d22\u5f15\uff0c\u56e0\u70ba\u8cc7\u6599\u884c\u53ea\u80fd\u6309\u7167\u4e00\u7a2e\u9806\u5e8f\u6392\u5217\u3002\u805a\u96c6\u7d22\u5f15\u901a\u5e38\u7528\u65bc\u4e3b\u9375\u3002<\/p>\n
CREATE UNIQUE INDEX idx_primary_key ON customers(customer_id) CLUSTER;<\/code><\/pre>\n
\u9019\u6a23\uff0c\u8cc7\u6599\u8868\u4e2d\u7684\u8cc7\u6599\u5c07\u6839\u64da\u201ccustomer_id\u201d\u9032\u884c\u6392\u5e8f\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/p>\n
5. \u975e\u805a\u96c6\u7d22\u5f15<\/h2>\n
\u975e\u805a\u96c6\u7d22\u5f15\u5247\u662f\u5c07\u7d22\u5f15\u8207\u8cc7\u6599\u5206\u958b\u5b58\u5132\u3002\u9019\u610f\u5473\u8457\u8cc7\u6599\u884c\u7684\u9806\u5e8f\u4e0d\u6703\u53d7\u5230\u7d22\u5f15\u7684\u5f71\u97ff\u3002\u975e\u805a\u96c6\u7d22\u5f15\u53ef\u4ee5\u6709\u591a\u500b\uff0c\u9069\u5408\u65bc\u67e5\u8a62\u4e2d\u7d93\u5e38\u4f7f\u7528\u7684\u5217\u3002<\/p>\n
CREATE INDEX idx_nonclustered ON customers(last_name);<\/code><\/pre>\n
6. \u4f4d\u5716\u7d22\u5f15<\/h2>\n
\u4f4d\u5716\u7d22\u5f15\u9069\u5408\u65bc\u4f4e\u57fa\u6578\u7684\u5217\uff0c\u5373\u5217\u4e2d\u4e0d\u540c\u503c\u7684\u6578\u91cf\u76f8\u5c0d\u8f03\u5c11\u3002\u9019\u7a2e\u7d22\u5f15\u4f7f\u7528\u4f4d\u5716\u4f86\u8868\u793a\u6bcf\u500b\u503c\u7684\u5b58\u5728\u8207\u5426\uff0c\u80fd\u5920\u6709\u6548\u5730\u58d3\u7e2e\u8cc7\u6599\u3002<\/p>\n
CREATE INDEX idx_bitmap ON customers(gender) USING BITMAP;<\/code><\/pre>\n
7. \u53cd\u5411\u7d22\u5f15<\/h2>\n
\u53cd\u5411\u7d22\u5f15\u662f\u4e00\u7a2e\u7279\u6b8a\u7684\u7d22\u5f15\u985e\u578b\uff0c\u4e3b\u8981\u7528\u65bc\u63d0\u9ad8\u5c0d\u65bc\u9577\u5b57\u4e32\u7684\u67e5\u8a62\u6548\u7387\u3002\u5b83\u5c07\u5b57\u4e32\u7684\u5b57\u7b26\u53cd\u5411\u5b58\u5132\uff0c\u9069\u5408\u65bc\u67d0\u4e9b\u7279\u5b9a\u7684\u67e5\u8a62\u6a21\u5f0f\u3002<\/p>\n
CREATE INDEX idx_reverse ON customers(name) REVERSE;<\/code><\/pre>\n
\u7e3d\u7d50<\/h2>\n
DB2\u63d0\u4f9b\u4e86\u591a\u7a2e\u7d22\u5f15\u985e\u578b\uff0c\u4ee5\u6eff\u8db3\u4e0d\u540c\u7684\u67e5\u8a62\u9700\u6c42\u3002\u9078\u64c7\u5408\u9069\u7684\u7d22\u5f15\u985e\u578b\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u8cc7\u6599\u5eab\u7684\u67e5\u8a62\u6027\u80fd\u3002\u5728\u8a2d\u8a08\u8cc7\u6599\u5eab\u6642\uff0c\u61c9\u6839\u64da\u5be6\u969b\u7684\u67e5\u8a62\u6a21\u5f0f\u548c\u8cc7\u6599\u7279\u6027\u4f86\u9078\u64c7\u7d22\u5f15\u985e\u578b\u3002\u82e5\u60a8\u9700\u8981\u9032\u4e00\u6b65\u4e86\u89e3\u5982\u4f55\u512a\u5316\u60a8\u7684\u8cc7\u6599\u5eab\u6027\u80fd\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u9999\u6e2fVPS<\/a>\u670d\u52d9\uff0c\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3DB2\u7d22\u5f15\u985e\u578b\uff0c\u5305\u62ecB\u6a39\u3001\u54c8\u5e0c\u548c\u5168\u6587\u7d22\u5f15\uff0c\u63d0\u5347\u6578\u64da\u67e5\u8a62\u6548\u7387\uff0c\u512a\u5316\u6578\u64da\u5eab\u6027\u80fd\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-60905","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60905","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=60905"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60905\/revisions"}],"predecessor-version":[{"id":60906,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60905\/revisions\/60906"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=60905"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=60905"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=60905"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}