{"id":15921,"date":"2023-12-04T23:49:29","date_gmt":"2023-12-04T15:49:29","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=15921"},"modified":"2023-12-05T00:04:23","modified_gmt":"2023-12-04T16:04:23","slug":"oracle-zhong-ru-he-zeng-jia-buffer-cache-de-ming-z","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/04\/oracle-zhong-ru-he-zeng-jia-buffer-cache-de-ming-z\/","title":{"rendered":"Oracle \u4e2d\u5982\u4f55\u589e\u52a0 buffer cache \u7684\u547d\u4e2d\u7387\uff1f"},"content":{"rendered":"

\u5728 Oracle \u6570\u636e\u5e93\u4e2d\uff0c\u63d0\u9ad8 Buffer Cache \u7684\u547d\u4e2d\u7387\u53ef\u4ee5\u6539\u5584\u67e5\u8be2\u6027\u80fd\uff0c\u51cf\u5c11\u5bf9\u78c1\u76d8\u7684 I\/O \u64cd\u4f5c\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u65b9\u6cd5\u6765\u589e\u52a0 Buffer Cache \u7684\u547d\u4e2d\u7387\uff1a<\/p>\n

    \n
  1. \n\u9002\u5f53\u8bbe\u7f6e Buffer Cache \u7684\u5927\u5c0f\uff1a<\/strong><\/p>\n
      \n
    • \u786e\u4fdd Buffer Cache \u7684\u5927\u5c0f\u9002\u5408\u6570\u636e\u5e93\u7684\u5de5\u4f5c\u8d1f\u8f7d\u548c\u53ef\u7528\u5185\u5b58\u3002\u53ef\u4ee5\u901a\u8fc7\u4fee\u6539 DB_CACHE_SIZE<\/code> \u53c2\u6570\u6765\u8c03\u6574 Buffer Cache \u7684\u5927\u5c0f\u3002<\/li>\n<\/ul>\n<\/li>\n
    • \n\u4f7f\u7528 KEEP \u548c RECYCLE \u7f13\u5b58\u6c60\uff1a<\/strong><\/p>\n
        \n
      • Oracle \u63d0\u4f9b\u4e86 KEEP \u7f13\u5b58\u6c60\u548c RECYCLE \u7f13\u5b58\u6c60\uff0c\u53ef\u4ee5\u5c06\u91cd\u8981\u7684\u6570\u636e\u5757\uff08\u5982\u70ed\u70b9\u6570\u636e\uff09\u653e\u5165 KEEP \u7f13\u5b58\u6c60\uff0c\u5c06\u4e0d\u7ecf\u5e38\u4f7f\u7528\u7684\u6570\u636e\u5757\u653e\u5165 RECYCLE \u7f13\u5b58\u6c60\u3002\u8fd9\u6709\u52a9\u4e8e\u66f4\u597d\u5730\u7ba1\u7406 Buffer Cache \u4e2d\u7684\u6570\u636e\u3002<\/li>\n<\/ul>\n
        ALTER TABLE my_table STORAGE (BUFFER_POOL KEEP);\nALTER TABLE my_table STORAGE (BUFFER_POOL RECYCLE);\n<\/code><\/pre>\n<\/li>\n
      • \n\u5408\u7406\u8bbe\u7f6e PCTFREE \u548c PCTUSED \u53c2\u6570\uff1a<\/strong><\/p>\n
          \n
        • \u9002\u5f53\u8bbe\u7f6e\u8868\u7684 PCTFREE<\/code>\uff08\u7528\u4e8e\u6307\u5b9a\u6bcf\u4e2a\u6570\u636e\u5757\u7684\u5269\u4f59\u7a7a\u95f4\u767e\u5206\u6bd4\uff09\u548c PCTUSED<\/code>\uff08\u7528\u4e8e\u6307\u5b9a\u4f55\u65f6\u5c06\u5757\u6807\u8bb0\u4e3a\u6ee1\u7684\u767e\u5206\u6bd4\uff09\u53c2\u6570\uff0c\u4ee5\u786e\u4fdd\u6570\u636e\u5757\u80fd\u591f\u5728 Buffer Cache \u4e2d\u4fdd\u6301\u8f83\u957f\u65f6\u95f4\u3002<\/li>\n<\/ul>\n<\/li>\n
        • \n\u4f7f\u7528\u4f4d\u56fe\u7d22\u5f15\uff1a<\/strong><\/p>\n
            \n
          • \u5728\u5408\u9002\u7684\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528\u4f4d\u56fe\u7d22\u5f15\u53ef\u4ee5\u51cf\u5c11\u5bf9\u78c1\u76d8\u7684 I\/O \u64cd\u4f5c\uff0c\u63d0\u9ad8 Buffer Cache \u7684\u547d\u4e2d\u7387\u3002<\/li>\n<\/ul>\n<\/li>\n
          • \n\u4f7f\u7528\u9002\u5f53\u7684\u7f13\u5b58\u8bfb\u53d6\u5927\u5c0f\uff1a<\/strong><\/p>\n
              \n
            • \u8003\u8651\u6570\u636e\u5e93\u5757\u7684\u5927\u5c0f\u4ee5\u53ca\u9002\u5f53\u7684\u7f13\u5b58\u8bfb\u53d6\u5927\u5c0f\uff0c\u4ee5\u786e\u4fdd\u8bfb\u53d6\u7684\u6570\u636e\u5757\u80fd\u591f\u6709\u6548\u5730\u653e\u5165 Buffer Cache\u3002<\/li>\n<\/ul>\n<\/li>\n
            • \n\u76d1\u63a7\u548c\u8c03\u6574\uff1a<\/strong><\/p>\n
                \n
              • \u5b9a\u671f\u76d1\u63a7 Buffer Cache \u7684\u6027\u80fd\u6307\u6807\uff0c\u5982\u7f13\u5b58\u547d\u4e2d\u7387\u3001\u8bfb\u53d6\u548c\u5199\u5165\u7684 I\/O \u64cd\u4f5c\u7b49\u3002\u6839\u636e\u76d1\u63a7\u7ed3\u679c\u8fdb\u884c\u8c03\u6574\uff0c\u4f18\u5316\u7f13\u5b58\u7684\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<\/li>\n
              • \n\u4f7f\u7528 Automatic Shared Memory Management (ASMM)\uff1a<\/strong><\/p>\n
                  \n
                • \u5728 Oracle 10g \u53ca\u66f4\u9ad8\u7248\u672c\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 ASMM \u6765\u81ea\u52a8\u7ba1\u7406\u5171\u4eab\u5185\u5b58\u533a\u57df\u7684\u5927\u5c0f\uff0c\u5305\u62ec Buffer Cache\u3002\u8fd9\u6837 Oracle \u6570\u636e\u5e93\u53ef\u4ee5\u66f4\u667a\u80fd\u5730\u5206\u914d\u548c\u8c03\u6574\u5185\u5b58\u3002<\/li>\n<\/ul>\n<\/li>\n
                • \n\u8003\u8651\u4f7f\u7528 In-Memory \u8868\uff1a<\/strong><\/p>\n
                    \n
                  • \u5bf9\u4e8e\u7ecf\u5e38\u8bbf\u95ee\u7684\u70ed\u6570\u636e\uff0c\u8003\u8651\u4f7f\u7528 Oracle In-Memory \u8868\u529f\u80fd\uff0c\u5c06\u6570\u636e\u76f4\u63a5\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d\uff0c\u4ece\u800c\u907f\u514d\u4e86\u5bf9 Buffer Cache \u7684\u9891\u7e41\u8bbf\u95ee\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n
                    \u6839\u636e\u5177\u4f53\u7684\u6570\u636e\u5e93\u5de5\u4f5c\u8d1f\u8f7d\u548c\u914d\u7f6e\uff0c\u4ee5\u4e0a\u65b9\u6cd5\u53ef\u80fd\u9700\u8981\u6839\u636e\u5b9e\u9645\u60c5\u51b5\u8fdb\u884c\u8c03\u6574\u3002\u76d1\u63a7\u6570\u636e\u5e93\u6027\u80fd\u5e76\u6839\u636e\u9700\u8981\u8c03\u6574\u914d\u7f6e\u662f\u4f18\u5316 Buffer Cache \u547d\u4e2d\u7387\u7684\u5173\u952e\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
                    \u5728 Oracle \u6570\u636e\u5e93\u4e2d\uff0c\u63d0\u9ad8 Buffer Cache \u7684\u547d\u4e2d\u7387\u53ef\u4ee5\u6539\u5584\u67e5\u8be2\u6027\u80fd\uff0c\u51cf\u5c11\u5bf9\u78c1\u76d8\u7684 I\/O \u64cd […]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[120],"tags":[],"class_list":["post-15921","post","type-post","status-publish","format-standard","hentry","category-oracel"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15921","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=15921"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15921\/revisions"}],"predecessor-version":[{"id":15922,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15921\/revisions\/15922"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=15921"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=15921"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=15921"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}