{"id":5313,"date":"2024-11-14T11:56:06","date_gmt":"2024-11-14T03:56:06","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5313\/"},"modified":"2024-11-14T11:56:06","modified_gmt":"2024-11-14T03:56:06","slug":"oracle%e7%b4%a2%e5%bc%95%e6%80%8e%e4%b9%88%e5%bb%ba","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5313\/","title":{"rendered":"oracle\u7d22\u5f15\u600e\u4e48\u5efa"},"content":{"rendered":"

\n \u521b\u5efa oracle \u7d22\u5f15\u53ef\u4ee5\u52a0\u901f\u6570\u636e\u68c0\u7d22\uff0c\u901a\u8fc7\u4ee5\u4e0b\u6b65\u9aa4\u5b9e\u73b0\uff1a\u786e\u5b9a\u9700\u8981\u7d22\u5f15\u7684\u5217\u3002\u9009\u62e9\u7d22\u5f15\u7c7b\u578b\uff0c\u5982 b \u6811\u6216\u54c8\u5e0c\u7d22\u5f15\u3002\u4f7f\u7528 create index \u8bed\u53e5\u521b\u5efa\u7d22\u5f15\u3002\u6307\u5b9a\u7d22\u5f15\u9009\u9879\uff0c\u5982 unique \u6216 bitmap\u3002\u8fd0\u884c analyze index \u547d\u4ee4\u5206\u6790\u7d22\u5f15\u3002\n<\/p><\/blockquote>\n

\"oracle\u7d22\u5f15\u600e\u4e48\u5efa\u63d2\u56fe\"<\/p>\n

\u5982\u4f55\u521b\u5efa Oracle \u7d22\u5f15<\/strong><\/p>\n

\u7d22\u5f15\u662f\u6570\u636e\u5e93\u8868\u4e2d\u4e00\u79cd\u7279\u6b8a\u7684\u6570\u636e\u7ed3\u6784\uff0c\u7528\u4e8e\u52a0\u901f\u6570\u636e\u68c0\u7d22\u3002\u5b83\u4eec\u901a\u8fc7\u521b\u5efa\u8868\u4e2d\u67d0\u4e00\u5217\u6216\u591a\u5217\u7684\u6392\u5e8f\u526f\u672c\u6765\u5b9e\u73b0\uff0c\u4f7f\u6570\u636e\u5e93\u53ef\u4ee5\u5feb\u901f\u627e\u5230\u6ee1\u8db3\u7279\u5b9a\u67e5\u8be2\u6761\u4ef6\u7684\u884c\u3002<\/p>\n

\u521b\u5efa Oracle \u7d22\u5f15\u7684\u6b65\u9aa4<\/strong><\/p>\n

    \n
  1. \u786e\u5b9a\u9700\u8981\u7d22\u5f15\u7684\u5217\uff1a<\/strong>\u9009\u62e9\u7ecf\u5e38\u7528\u4e8e\u67e5\u8be2\u6761\u4ef6\u7684\u5217\uff0c\u6216\u53c2\u4e0e\u8054\u63a5\u64cd\u4f5c\u7684\u5217\u3002<\/li>\n
  2. \u9009\u62e9\u7d22\u5f15\u7c7b\u578b\uff1a<\/strong>Oracle \u63d0\u4f9b\u4e86\u591a\u79cd\u7d22\u5f15\u7c7b\u578b\uff0c\u6bcf\u79cd\u7c7b\u578b\u90fd\u6709\u5176\u4f18\u7f3a\u70b9\u3002\u6700\u5e38\u7528\u7684\u7d22\u5f15\u7c7b\u578b\u662f B \u6811\u7d22\u5f15\u548c\u54c8\u5e0c\u7d22\u5f15\u3002<\/li>\n
  3. \n

    \u521b\u5efa\u7d22\u5f15\uff1a<\/strong>\u4f7f\u7528 CREATE INDEX \u8bed\u53e5\u521b\u5efa\u7d22\u5f15\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n

    CREATE INDEX [\u7d22\u5f15\u540d\u79f0] ON [\u8868\u540d\u79f0] ([\u5217\u540d\u79f0]);<\/pre>\n
     \u767b\u5f55\u540e\u590d\u5236 <\/li>\n
  4. \n
    \u6307\u5b9a\u7d22\u5f15\u9009\u9879\uff1a<\/strong>\u60a8\u53ef\u4ee5\u6307\u5b9a\u5176\u4ed6\u9009\u9879\u6765\u4f18\u5316\u7d22\u5f15\u7684\u6027\u80fd\uff0c\u4f8b\u5982\uff1a<\/p>\n
      \n
    •  UNIQUE\uff1a<\/strong>\u5f3a\u5236\u7d22\u5f15\u5217\u4e2d\u7684\u503c\u552f\u4e00\u3002<\/li>\n
    •  BITMAP\uff1a<\/strong>\u9002\u7528\u4e8e\u5305\u542b\u5927\u91cf\u91cd\u590d\u503c\u7684\u5217\u3002<\/li>\n
    •  REVERSE\uff1a<\/strong>\u521b\u5efa\u4ece\u9ad8\u5230\u4f4e\u7684\u503c\u7684\u7d22\u5f15\u3002<\/li>\n<\/ul>\n<\/li>\n
    •  \u5206\u6790\u7d22\u5f15\uff1a<\/strong>\u521b\u5efa\u7d22\u5f15\u540e\uff0c\u8fd0\u884c ANALYZE INDEX \u547d\u4ee4\u4ee5\u6536\u96c6\u7d22\u5f15\u7edf\u8ba1\u4fe1\u606f\u3002\u8fd9\u5c06\u5e2e\u52a9\u4f18\u5316\u5668\u505a\u51fa\u66f4\u597d\u7684\u6267\u884c\u8ba1\u5212\u51b3\u7b56\u3002<\/li>\n<\/ol>\n
      \u793a\u4f8b<\/strong><\/p>\n
      \u521b\u5efa\u4e00\u4e2a\u540d\u4e3a idx_emp_salary \u7684 B \u6811\u7d22\u5f15\uff0c\u7528\u4e8e\u8868 employees \u4e2d\u7684 salary \u5217\uff1a<\/p>\n
      CREATE INDEX idx_emp_salary ON employees (salary);<\/pre>\n
       \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
      \u521b\u5efa\u4e00\u4e2a\u540d\u4e3a idx_emp_name_unique \u7684\u552f\u4e00\u54c8\u5e0c\u7d22\u5f15\uff0c\u7528\u4e8e employees \u8868\u4e2d\u7684 name \u5217\uff1a<\/p>\n
      CREATE UNIQUE INDEX idx_emp_name_unique ON employees (name) USING HASH;<\/pre>\n
       \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
      \u4ee5\u4e0a\u5c31\u662f\u7d22\u5f15\u600e\u4e48\u5efa\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
      \u521b\u5efa oracle \u7d22\u5f15\u53ef\u4ee5\u52a0\u901f\u6570\u636e\u68c0\u7d22\uff0c\u901a\u8fc7\u4ee5\u4e0b\u6b65\u9aa4\u5b9e\u73b0\uff1a\u786e\u5b9a\u9700\u8981\u7d22\u5f15\u7684\u5217\u3002\u9009\u62e9\u7d22\u5f15\u7c7b\u578b\uff0c\u5982 b \u6811\u6216\u54c8\u5e0c\u7d22\u5f15\u3002\u4f7f\u7528 create index \u8bed\u53e5\u521b\u5efa\u7d22\u5f15\u3002\u6307\u5b9a\u7d22\u5f15\u9009\u9879\uff0c\u5982 unique \u6216 bitmap\u3002\u8fd0\u884c analyze index \u547d\u4ee4\u5206\u6790\u7d22\u5f15\u3002 \u5982\u4f55\u521b\u5efa Oracle \u7d22\u5f15 \u7d22\u5f15\u662f\u6570\u636e\u5e93\u8868\u4e2d\u4e00\u79cd\u7279\u6b8a\u7684\u6570\u636e\u7ed3\u6784\uff0c\u7528\u4e8e\u52a0\u901f\u6570\u636e\u68c0\u7d22\u3002\u5b83\u4eec\u901a\u8fc7\u521b\u5efa\u8868\u4e2d\u67d0\u4e00\u5217\u6216\u591a\u5217\u7684\u6392\u5e8f\u526f\u672c\u6765\u5b9e\u73b0\uff0c\u4f7f\u6570\u636e\u5e93\u53ef\u4ee5\u5feb\u901f\u627e\u5230\u6ee1\u8db3\u7279\u5b9a\u67e5\u8be2\u6761\u4ef6\u7684\u884c\u3002 \u521b\u5efa Oracle \u7d22\u5f15\u7684\u6b65\u9aa4 \u786e\u5b9a\u9700\u8981\u7d22\u5f15\u7684\u5217\uff1a\u9009\u62e9\u7ecf\u5e38\u7528\u4e8e\u67e5\u8be2\u6761\u4ef6\u7684\u5217\uff0c\u6216\u53c2\u4e0e\u8054\u63a5\u64cd\u4f5c\u7684\u5217\u3002 \u9009\u62e9\u7d22\u5f15\u7c7b\u578b\uff1aOracle \u63d0\u4f9b\u4e86\u591a\u79cd\u7d22\u5f15\u7c7b\u578b\uff0c\u6bcf\u79cd\u7c7b\u578b\u90fd\u6709\u5176\u4f18\u7f3a\u70b9\u3002\u6700\u5e38\u7528\u7684\u7d22\u5f15\u7c7b\u578b\u662f B \u6811\u7d22\u5f15\u548c\u54c8\u5e0c\u7d22\u5f15\u3002 \u521b\u5efa\u7d22\u5f15\uff1a\u4f7f\u7528 CREATE INDEX \u8bed\u53e5\u521b\u5efa\u7d22\u5f15\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a CREATE INDEX [\u7d22\u5f15\u540d\u79f0] ON [\u8868\u540d\u79f0] ([\u5217\u540d\u79f0]); \u767b\u5f55\u540e\u590d\u5236 \u6307\u5b9a\u7d22\u5f15\u9009\u9879\uff1a\u60a8\u53ef\u4ee5\u6307\u5b9a\u5176\u4ed6\u9009\u9879\u6765\u4f18\u5316\u7d22\u5f15\u7684\u6027\u80fd\uff0c\u4f8b\u5982\uff1a UNIQUE\uff1a\u5f3a\u5236\u7d22\u5f15\u5217\u4e2d\u7684\u503c\u552f\u4e00\u3002 BITMAP\uff1a\u9002\u7528\u4e8e\u5305\u542b\u5927\u91cf\u91cd\u590d\u503c\u7684\u5217\u3002 REVERSE\uff1a\u521b\u5efa\u4ece\u9ad8\u5230\u4f4e\u7684\u503c\u7684\u7d22\u5f15\u3002 \u5206\u6790\u7d22\u5f15\uff1a\u521b\u5efa\u7d22\u5f15\u540e\uff0c\u8fd0\u884c ANALYZE INDEX \u547d\u4ee4\u4ee5\u6536\u96c6\u7d22\u5f15\u7edf\u8ba1\u4fe1\u606f\u3002\u8fd9\u5c06\u5e2e\u52a9\u4f18\u5316\u5668\u505a\u51fa\u66f4\u597d\u7684\u6267\u884c\u8ba1\u5212\u51b3\u7b56\u3002 \u793a\u4f8b \u521b\u5efa\u4e00\u4e2a\u540d\u4e3a idx_emp_salary \u7684 B \u6811\u7d22\u5f15\uff0c\u7528\u4e8e\u8868 employees \u4e2d\u7684 salary \u5217\uff1a […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-5313","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5313","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=5313"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5313\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5313"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5313"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5313"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}