{"id":123388,"date":"2026-11-07T05:40:49","date_gmt":"2026-11-06T21:40:49","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/123388.html"},"modified":"2026-11-07T05:40:49","modified_gmt":"2026-11-06T21:40:49","slug":"innodb-buffer-pool-%e8%af%a6%e8%a7%a3%ef%bc%9a%e5%86%85%e5%ad%98%e7%bb%93%e6%9e%84%e3%80%81%e6%8e%a7%e5%88%b6%e5%9d%97%e4%b8%8e%e6%94%b9%e8%bf%9b-lru","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/123388.html","title":{"rendered":"InnoDB Buffer Pool \u8be6\u89e3\uff1a\u5185\u5b58\u7ed3\u6784\u3001\u63a7\u5236\u5757\u4e0e\u6539\u8fdb LRU"},"content":{"rendered":"

\u4e00\u3001Buffer Pool \u662f\u4ec0\u4e48<\/h2>\n

1.1 \u4f5c\u7528<\/h4>\n

\u78c1\u76d8\u968f\u673a IO \u6781\u6162，InnoDB \u628a\u9891\u7e41\u8bbf\u95ee\u7684\u6570\u636e\u9875\/\u7d22\u5f15\u9875\u7f13\u5b58\u5230\u4e3b\u5185\u5b58，\u547d\u4e2d\u5c31\u76f4\u63a5\u8fd4\u56de，\u5927\u5e45\u51cf\u5c11\u78c1\u76d8 IO\u3002<\/p>\n

\u52a0\u7c97\u8981\u70b9：\u5185\u5b58\u968f\u673a\u8bbf\u95ee\u90fd\u6bd4\u78c1\u76d8\u987a\u5e8f\u8bbf\u95ee\u5feb\u4e00\u5230\u4e24\u4e2a\u6570\u91cf\u7ea7\u3002<\/p>\n

1.2 \u7f13\u5b58\u7684\u662f\u4ec0\u4e48<\/h4>\n\n\u5185\u5bb9\u5c5e\u4e8e Buffer Pool \u5417<\/tr>\n\n\n\n
\u6570\u636e\u9875 \/ \u7d22\u5f15\u9875（\u805a\u7c07\u7d22\u5f15\u3001\u4e8c\u7ea7\u7d22\u5f15\u3001undo\u3001change buffer \u4f4d\u56fe\u7b49）<\/td>\n\u2705 \u8fd9\u624d\u662f Buffer Pool \u7f13\u5b58\u4e3b\u4f53<\/td>\n<\/tr>\n
Adaptive Hash Index（AHI）<\/td>\n\u2705 \u5efa\u7acb\u5728 Buffer Pool \u9875\u4e4b\u4e0a\u7684\u54c8\u5e0c\u7d22\u5f15\u7ed3\u6784，\u5360\u7528\u6c60\u5185\u7a7a\u95f4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u52a0\u7c97\u8981\u70b9：Buffer Pool \u7684\u6838\u5fc3\u662f"\u6570\u636e\u9875\u7f13\u5b58"\u3002<\/p>\n

1.3 instance \/ chunk \/ page \u4e09\u7ea7\u7ed3\u6784<\/h4>\n

Buffer Pool
\n \u2514\u2500\u2500 instance（\u5b9e\u4f8b，\u72ec\u7acb\u52a0\u9501，\u9ed8\u8ba4 8 \u4e2a）
\n \u2514\u2500\u2500 chunk（\u5185\u5b58\u5206\u914d\u5355\u4f4d，\u9ed8\u8ba4 128MB）
\n \u2514\u2500\u2500 page（16KB \u6570\u636e\u9875\u5e27）
\n + \u5bf9\u5e94\u7684 control block（\u63a7\u5236\u5757）<\/p>\n

    \n
  • instance：\u771f\u6b63\u7684\u7f13\u51b2\u6c60\u5bf9\u8c61，\u5185\u5b58\u64cd\u4f5c\u5728 instance \u5185\u8fdb\u884c；\u6bcf\u4e2a instance \u6709\u72ec\u7acb\u7684 mutex，\u591a\u7ebf\u7a0b\u5e76\u53d1\u8bbf\u95ee\u4e0d\u540c instance \u4e0d\u4e92\u76f8\u963b\u585e；<\/li>\n
  • chunk：\u8fd0\u884c\u65f6\u52a8\u6001\u8c03\u6574\u5927\u5c0f\u7684\u5355\u4f4d，\u9ed8\u8ba4 innodb_buffer_pool_chunk_size = 128MB；<\/li>\n
  • page：\u4ece\u78c1\u76d8\u52a0\u8f7d\u8fdb\u6765\u7684 16KB \u9875\u5e27\u3002<\/li>\n
  • \"\"<\/li>\n<\/ul>\n

    1.4 \u67e5\u770b\u914d\u7f6e<\/h4>\n

    SHOW VARIABLES LIKE 'innodb_buffer_pool_size'; — \u603b\u5927\u5c0f
    \nSHOW VARIABLES LIKE 'innodb_buffer_pool_instances'; — \u5b9e\u4f8b\u6570
    \nSHOW VARIABLES LIKE 'innodb_buffer_pool_chunk_size'; — chunk \u5927\u5c0f（128MB）<\/p>\n

    \n

    \u4e8c\u3001\u5185\u5b58\u4e2d\u5982\u4f55\u5bfb\u5740\u4e00\u9875<\/h3>\n

    2.1 \u5916\u5b58\u5bfb\u5740\u56de\u987e<\/h4>\n

    \u78c1\u76d8\u4e0a\u5b9a\u4f4d\u4e00\u9875 = space_id \u00d7 \u8868\u7a7a\u95f4\u57fa\u5740 + page_no \u00d7 16KB，\u901a\u8fc7 B+Tree \u4e00\u5c42\u5c42\u76ee\u5f55\u9875\u627e\u5230\u76ee\u6807 (space_id, page_no)\u3002<\/p>\n

    2.2 \u5185\u5b58\u5bfb\u5740：page_hash \u54c8\u5e0c\u8868<\/h4>\n

    \u5185\u5b58\u91cc\u4e0d\u505a\u7b97\u672f\u5bfb\u5740，\u800c\u662f\u7528\u4e00\u5f20\u54c8\u5e0c\u8868 page_hash：<\/p>\n

    key = (space_id, page_no) （\u8868\u7a7a\u95f4id + \u9875id \u2014\u2014\u5355\u8868\u5185\u552f\u4e00）
    \nvalue = \u5bf9\u5e94 control block \u7684\u6307\u9488<\/p>\n

    \u4e00\u6b21\u67e5\u8be2\u7684\u5b8c\u6574\u8def\u5f84：
    \n1. B+Tree \u5728\u78c1\u76d8\u7ed3\u6784\u4e0a\u5b9a\u4f4d\u5230\u76ee\u6807 (space_id=0, page_no=123)
    \n2. \u5148\u67e5 Buffer Pool \u7684 page_hash \u54c8\u5e0c\u8868
    \n \u251c\u2500 \u547d\u4e2d \u2192 \u62ff\u5230 control block \u2192 \u76f4\u63a5\u8bfb\u9875\u5e27\u5185\u5b58\u5730\u5740 \u2192 \u8fd4\u56de
    \n \u2514\u2500 \u672a\u547d\u4e2d \u2192 \u4ece Free List \u53d6\u4e00\u4e2a\u7a7a\u95f2\u63a7\u5236\u5757 \u2192 \u628a\u78c1\u76d8\u9875\u8bfb\u8fdb\u9875\u5e27
    \n \u2192 \u63a7\u5236\u5757\u6302\u5165 LRU old \u533a \u2192 \u52a0\u5165 page_hash \u2192 \u8fd4\u56de<\/p>\n

    \u52a0\u7c97\u8981\u70b9：\u5185\u5b58\u4e2d\u7684"\u627e\u9875"\u9760 (space_id, page_no) \u54c8\u5e0c，\u4e0d\u662f\u9875\u53f7\u00d7\u9875\u5927\u5c0f\u3002B+Tree \u51b3\u5b9a"\u627e\u54ea\u4e00\u9875"，page_hash \u51b3\u5b9a"\u8fd9\u9875\u5728\u5185\u5b58\u54ea\u4e2a\u5730\u5740"\u3002<\/p>\n

    \n

    \u4e09\u3001\u63a7\u5236\u5757：\u5185\u5b58\u9875\u7684\u5143\u6570\u636e<\/h3>\n

    3.1 \u4e3a\u4ec0\u4e48\u9700\u8981\u63a7\u5236\u5757<\/h4>\n

    \u78c1\u76d8\u4e0a\u4e0b\u4e00\u9875\u7684\u4f4d\u7f6e\u7531 page_no \u00d7 \u9875\u5927\u5c0f \u552f\u4e00\u786e\u5b9a，\u4f46\u5185\u5b58\u4e2d\u9875\u5e27\u5730\u5740\u662f\u8fd0\u884c\u65f6\u5206\u914d\u7684，\u6ca1\u6709\u56fa\u5b9a\u504f\u79fb\u3002InnoDB \u4e3a\u6bcf\u4e2a\u9875\u5e27\u914d\u4e00\u4e2a\u63a7\u5236\u5757（buf_block_t），\u8bb0\u5f55\u5b83\u7684\u5143\u6570\u636e\u3002<\/p>\n

    3.2 \u63a7\u5236\u5757\u6210\u5458<\/h4>\n\n\u6210\u5458\u4f5c\u7528<\/tr>\n\n\n\n\n\n\n\n
    frame<\/td>\n\u6307\u5411\u5b9e\u9645 16KB \u9875\u5e27\u7684\u5185\u5b58\u5730\u5740<\/td>\n<\/tr>\n
    \u591a\u4e2a list \u6307\u9488<\/td>\nLRU \u94fe\u8868\u6307\u9488\u3001Flush \u94fe\u8868\u6307\u9488\u3001Free \u94fe\u8868\u6307\u9488（\u540c\u4e00\u4e2a\u63a7\u5236\u5757\u540c\u65f6\u6302\u591a\u4e2a\u94fe\u8868）<\/td>\n<\/tr>\n
    space_id \/ page_no<\/td>\n\u5bf9\u5e94\u54ea\u5f20\u8868\u7a7a\u95f4\u54ea\u4e00\u9875<\/td>\n<\/tr>\n
    state<\/td>\nFREE \/ CACHED \/ DIRTY \u7b49\u72b6\u6001<\/td>\n<\/tr>\n
    fix_count<\/td>\n\u88ab\u591a\u5c11\u7ebf\u7a0b\u5f15\u7528（>0 \u4e0d\u80fd\u6dd8\u6c70）<\/td>\n<\/tr>\n
    LRU \u4f4d\u7f6e\u6807\u8bb0<\/td>\nyoung \/ old \u533a<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    3.3 chunk \u7684\u7269\u7406\u5e03\u5c40<\/h4>\n

    \u4e00\u4e2a chunk（128MB）：
    \n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
    \n\u2502 control block \u6570\u7ec4（\u6bcf\u4e2a\u7ea6\u51e0\u767e\u5b57\u8282） \u2502 \u2190 \u5143\u6570\u636e
    \n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524
    \n\u2502 page \u5e27\u6570\u7ec4（\u6bcf\u4e2a 16KB） \u2502 \u2190 \u5b9e\u9645\u6570\u636e
    \n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n

    \u63a7\u5236\u5757\u6570\u91cf = chunk \u5927\u5c0f \/ \u9875\u5927\u5c0f（128MB \/ 16KB = 8192 \u4e2a）<\/p>\n

      \n
    • \u63a7\u5236\u5757\u4e0e\u9875\u5e27\u4e00\u4e00\u5bf9\u5e94；<\/li>\n
    • \u82e5 chunk \u5927\u5c0f\u4e0d\u662f\u9875\u5927\u5c0f\u6574\u6570\u500d，\u5c3e\u90e8\u6709\u5c11\u91cf\u788e\u7247\u533a\u88ab\u6d6a\u8d39；<\/li>\n
    • \u52a0\u7c97\u8981\u70b9：\u63a7\u5236\u5757\u4e4b\u95f4\u7684\u53cc\u94fe\u8868\u5173\u7cfb \u2260 \u9875\u5e27\u5728\u5185\u5b58\u4e2d\u7684\u7269\u7406\u76f8\u90bb\u5173\u7cfb\u2014\u2014\u9875\u5e27\u53ef\u80fd\u7269\u7406\u76f8\u90bb，\u4f46 LRU \u94fe\u8868\u662f\u6309"\u51b7\u70ed"\u903b\u8f91\u4e32\u8054\u7684\u3002<\/li>\n<\/ul>\n

      3.4 \u542f\u52a8\u65f6\u5168\u90e8\u9884\u5206\u914d<\/h4>\n

      Buffer Pool \u542f\u52a8\u65f6\u5c31\u6309\u914d\u7f6e\u5927\u5c0f\u4e00\u6b21\u6027\u9884\u7559\u597d\u5168\u90e8\u5185\u5b58：\u6240\u6709\u9875\u5e27\u6b64\u65f6\u662f\u7a7a\u7684，\u63a7\u5236\u5757\u90fd\u6302\u5728 Free List \u4e0a\u3002\u540e\u7eed\u4e0d\u9700\u8981 malloc，\u53ea\u662f\u628a\u7a7a\u9875\u5e27\u586b\u6570\u636e\u3001\u4ece Free List \u79fb\u5230 LRU\u3002<\/p>\n

      3.5 chunk \u4e3a\u4ec0\u4e48\u5b58\u5728<\/span>（\u52a8\u6001\u8c03\u4f18）<\/h4>\n

      \u5982\u679c Buffer Pool \u4e00\u5f00\u59cb\u5c31\u89c4\u5b9a\u6b7binstance\u8fb9\u754c，\u6269\u5bb9\u65f6\u5fc5\u987b\u6574\u5757\u62f7\u8d1d\u5230\u65b0\u5185\u5b58\u3002\u5f15\u5165 chunk \u540e：<\/p>\n

        \n
      • \u8c03\u5927 \u2192 \u7533\u8bf7\u65b0 chunk，\u6302\u5230 instance \u4e0a；<\/li>\n
      • \u8c03\u5c0f \u2192 \u6458\u8d70\u4e00\u4e2a chunk；<\/li>\n
      • \u62f7\u8d1d\u7684\u53ea\u662f chunk \u6307\u9488\/\u5f15\u7528，\u4e0d\u662f\u6574\u4e2a\u6c60\u7684\u6570\u636e\u3002<\/li>\n
      • \"\"<\/li>\n<\/ul>\n

        \u8fd9\u5c31\u662f 8.0 \u652f\u6301\u5728\u7ebf\u8c03\u6574 innodb_buffer_pool_size \u7684\u5e95\u5c42\u539f\u7406\u3002<\/p>\n

        \n

        \u56db\u3001\u4e09\u79cd\u9875\u72b6\u6001\u4e0e\u4e09\u4e2a\u94fe\u8868<\/h3>\n

        4.1 \u4e09\u79cd\u9875\u72b6\u6001<\/h4>\n\n\u72b6\u6001\u542b\u4e49<\/tr>\n\n\n\n\n
        Free<\/td>\n\u672a\u4f7f\u7528\u7684\u7a7a\u9875\u5e27<\/td>\n<\/tr>\n
        Clean<\/td>\n\u5df2\u7f13\u5b58，\u4f46\u672a\u88ab\u4fee\u6539，\u4e0e\u78c1\u76d8\u4e00\u81f4<\/td>\n<\/tr>\n
        Dirty<\/td>\n\u5df2\u88ab\u4fee\u6539，\u5185\u5b58\u4e0e\u78c1\u76d8\u4e0d\u4e00\u81f4，\u9700\u8981\u5237\u76d8<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        4.2 \u4e09\u4e2a\u94fe\u8868（\u5143\u7d20\u90fd\u662f\u63a7\u5236\u5757）<\/h4>\n\n\u94fe\u8868\u7ba1\u7406\u5bf9\u8c61<\/tr>\n\n\n\n\n
        Free List<\/td>\nFree \u72b6\u6001\u7684\u63a7\u5236\u5757<\/td>\n<\/tr>\n
        LRU List<\/td>\n\u5df2\u7f13\u5b58\u7684\u9875（Clean + Dirty），\u5206 young\/old \u4e24\u533a<\/td>\n<\/tr>\n
        Flush List<\/td>\nDirty \u9875（\u5f85\u5237\u76d8）<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        4.3 \u4e00\u4e2a\u63a7\u5236\u5757\u53ef\u4ee5\u540c\u65f6\u6302\u591a\u4e2a\u94fe\u8868<\/h4>\n

        \u4e00\u4e2a\u810f\u9875\u7684\u63a7\u5236\u5757：
        \n \u251c\u2500\u2500 \u5728 LRU List \u4e0a（\u56e0\u4e3a\u5b83\u5df2\u88ab\u7f13\u5b58）
        \n \u2514\u2500\u2500 \u5728 Flush List \u4e0a（\u56e0\u4e3a\u5b83\u662f\u810f\u7684，\u5f85\u5237\u76d8）<\/p>\n

        \u4e00\u4e2a\u5e72\u51c0\u9875\u7684\u63a7\u5236\u5757：
        \n \u2514\u2500\u2500 \u53ea\u5728 LRU List \u4e0a<\/p>\n

        \u4e00\u4e2a\u7a7a\u95f2\u9875\u7684\u63a7\u5236\u5757：
        \n \u2514\u2500\u2500 \u53ea\u5728 Free List \u4e0a<\/p>\n

        \u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u63a7\u5236\u5757\u91cc\u9700\u8981\u591a\u4e2a\u72ec\u7acb\u7684 list \u6307\u9488，\u800c\u4e0d\u662f\u4e00\u4e2a\u524d\u540e\u6307\u9488\u3002<\/p>\n

        4.4 \u9875\u7684\u751f\u547d\u5468\u671f\u6d41\u8f6c（\u5b8c\u6574\u7684\u9875\u5c5e\u6027\u53d8\u6362\u6d41\u7a0b）<\/span><\/h4>\n

        \u78c1\u76d8\u8bfb\u5165\u65b0\u9875
        \n \u2502
        \n \u25bc
        \n\u4ece Free List \u6458\u63a7\u5236\u5757 \u2192 \u8bfb\u9875\u5e27 \u2192 \u6302\u5165 LRU \u7684\u4e2d\u70b9\u4f4d\u7f6e
        \n \u2502
        \n \u251c\u2500\u2500 \u88ab\u4fee\u6539 \u2192 \u6807\u8bb0 Dirty \u2192 \u6302\u5165 Flush List
        \n \u2502 \u2502
        \n \u2502 \u25bc
        \n \u2502 \u540e\u53f0\u7ebf\u7a0b\u5f02\u6b65\u5237\u76d8 \u2192 \u4ece Flush List \u6458\u4e0b \u2192 \u6062\u590d Clean
        \n \u2502
        \n \u2514\u2500\u2500 Free \u8017\u5c3d \u2192 \u6dd8\u6c70 old \u533a\u5c3e\u90e8\u7684\u9875 \u2192 \u8be5\u63a7\u5236\u5757\u88ab\u65b0\u9875\u590d\u7528<\/p>\n

        \n

        \u4e94\u3001\u6539\u8fdb LRU：young \/ old \u5206\u533a<\/h3>\n

        5.1 \u4e3a\u4ec0\u4e48\u4e0d\u7528\u6734\u7d20 LRU<\/h4>\n

        \u6734\u7d20 LRU：\u65b0\u9875\u76f4\u63a5\u63d2\u5934\u90e8，\u547d\u4e2d\u4e5f\u79fb\u5230\u5934\u90e8\u3002\u95ee\u9898\u5728\u4e8e\u9884\u8bfb\u6c61\u67d3：<\/p>\n

        InnoDB \u8bfb\u5230\u9875 N，\u4f1a\u6309\u5c40\u90e8\u6027\u539f\u7406\u9884\u8bfb N+1\u3001N+2\u3001N+3…
        \n\u8fd9\u4e9b\u9875\u5927\u6982\u7387\u4e0d\u4f1a\u9a6c\u4e0a\u88ab\u8bbf\u95ee；
        \n\u5982\u679c\u5168\u90e8\u63d2 LRU \u5934\u90e8，\u4f1a\u628a\u771f\u6b63\u70ed\u7684\u9875\u6324\u5230\u5c3e\u90e8，\u53cd\u800c\u88ab\u5148\u6dd8\u6c70\u3002<\/p>\n

        5.2 InnoDB \u7684\u6539\u8fdb：midpoint \u63d2\u5165<\/h4>\n

        LRU List \u5206\u4e24\u533a：<\/p>\n

        LRU List（\u6309\u4ece\u70ed\u5230\u51b7\u6392\u5217）：
        \n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
        \n\u2502 young \u533a（\u7ea6 5\/8） \u2502 old \u533a（\u7ea6 3\/8） \u2502
        \n\u2502 \u771f\u6b63\u7684\u70ed\u6570\u636e \u2502 \u65b0\u8bfb\u5165\/\u51b7\u6570\u636e \u2502
        \n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518
        \n\u5934\u90e8 \u5c3e\u90e8<\/p>\n

          \n
        • \u65b0\u8bfb\u5165\u7684\u9875 \u2192 \u63d2\u5230 old \u533a\u5934\u90e8（midpoint，\u4e24\u533a\u5206\u754c\u5904）；<\/li>\n
        • old \u533a\u9875\u88ab\u518d\u6b21\u8bbf\u95ee（\u8d85\u8fc7 innodb_old_blocks_time，\u9ed8\u8ba4 1s）\u2192 \u664b\u5347\u5230 young \u533a\u5934\u90e8；<\/li>\n
        • \u6dd8\u6c70\u4ece old \u533a\u5c3e\u90e8\u5f00\u59cb；<\/li>\n
        • young \u533a\u5185\u90e8\u547d\u4e2d \u2192 \u79fb\u5230 young \u5934\u90e8\u3002<\/li>\n<\/ul>\n

          5.3 \u4e3a\u4ec0\u4e48\u65b0\u9875\u63d2\u4e2d\u70b9\u800c\u4e0d\u662f\u5934\u90e8<\/h4>\n

          \u9884\u8bfb（Read-Ahead） \u4f1a\u6279\u91cf\u5e26\u5165\u76f8\u90bb\u9875（\u7ebf\u6027\u9884\u8bfb，innodb_read_ahead_threshold）\u3002\u8fd9\u4e9b\u9875\u662f"\u987a\u624b\u5e26\u8fdb\u6765\u7684"，\u77ed\u671f\u4e0d\u4f1a\u88ab\u8bbf\u95ee：<\/p>\n

            \n
          • \u63d2\u5934\u90e8 \u2192 \u5b83\u4eec\u4f1a\u5728 LRU \u91cc\u505c\u7559\u5f88\u4e45，\u5360\u7740\u70ed\u4f4d\u7f6e；<\/li>\n
          • \u63d2 old \u533a \u2192 \u77ed\u671f\u4e0d\u88ab\u518d\u6b21\u8bbf\u95ee\u5c31\u76f4\u63a5\u4ece old \u5c3e\u90e8\u6dd8\u6c70，\u4e0d\u6c61\u67d3 young \u70ed\u533a\u3002<\/li>\n<\/ul>\n

            innodb_old_blocks_time（\u9ed8\u8ba4 1000ms）\u5c31\u662f\u4e3a\u4e86\u9632\u6b62"\u9884\u8bfb\u77ac\u95f4\u6279\u91cf\u89e6\u78b0 old \u533a\u9875\u5bfc\u81f4\u5168\u90e8\u664b\u5347"\u3002<\/p>\n

            \n

            \u516d\u3001instance \u5e76\u53d1\u4e0e\u8c03\u4f18<\/h3>\n

            6.1 \u591a instance \u4e3a\u4ec0\u4e48\u63d0\u5347\u5e76\u53d1<\/h4>\n

            \u6bcf\u4e2a instance \u6709\u72ec\u7acb\u7684 mutex \u548c\u9501\u3002\u591a\u7ebf\u7a0b\u540c\u65f6\u8bbf\u95ee Buffer Pool \u65f6，\u53ea\u8981\u8bbf\u95ee\u4e0d\u540c instance，\u5c31\u4e0d\u62a2\u540c\u4e00\u628a\u9501：<\/p>\n

            1 \u4e2a instance：\u6240\u6709\u7ebf\u7a0b\u62a2\u540c\u4e00\u628a LRU mutex \u2192 \u74f6\u9888
            \n8 \u4e2a instance：8 \u628a\u9501，\u4e0d\u540c\u7ebf\u7a0b\u5404\u7ba1\u4e00\u644a \u2192 \u5e76\u53d1\u5ea6 \u00d7 N<\/p>\n

            6.2 instances \u6570\u91cf\u89c4\u5219<\/h4>\n\nBuffer Pool \u603b\u5927\u5c0finstances \u6570\u91cf<\/tr>\n\n\n\n
            < 1GB<\/td>\n\u5f3a\u5236\u4e3a 1（\u4e0d\u7ba1\u914d\u7f6e）<\/td>\n<\/tr>\n
            > 1GB<\/td>\n\u9ed8\u8ba4 8（\u5b98\u65b9\u5efa\u8bae\u6bcf\u4e2a instance \u2265 1GB）<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

            \u8c03\u4f18\u53e3\u8bc0：\u603b\u5927\u5c0f \/ instances \u2248 1GB，\u4e0d\u8981\u4e3a\u4e86\u591a\u6838\u76f2\u76ee\u5f00\u591a instance\u3002<\/p>\n

            6.3 \u52a8\u6001\u8c03\u6574<\/h4>\n

            8.0 \u652f\u6301\u5728\u7ebf\u8c03\u6574 innodb_buffer_pool_size，\u4ee5 chunk \u4e3a\u5355\u4f4d\u589e\u5220，\u65e0\u9700\u91cd\u542f\u3002<\/p>\n

            \n

            \u4e03\u3001\u67e5\u770b\u8fd0\u884c\u72b6\u6001<\/h3>\n

            SHOW ENGINE INNODB STATUS\\\\G<\/p>\n

            \u627e\u5230 BUFFER POOL AND MEMORY \u6bb5，\u5173\u952e\u6307\u6807：<\/p>\n\n\u6307\u6807\u542b\u4e49<\/tr>\n\n\n\n\n\n\n\n
            Buffer pool size<\/td>\n\u603b\u9875\u6570<\/td>\n<\/tr>\n
            Free buffers<\/td>\n\u7a7a\u95f2\u9875\u6570<\/td>\n<\/tr>\n
            Database pages<\/td>\nLRU \u4e2d\u9875\u6570<\/td>\n<\/tr>\n
            Old database pages<\/td>\nold \u533a\u9875\u6570<\/td>\n<\/tr>\n
            Buffer pool hit rate<\/td>\n\u547d\u4e2d\u7387（\u5173\u952e！\u5e94\u63a5\u8fd1 1000\/1000）<\/td>\n<\/tr>\n
            Dirty pages<\/td>\n\u810f\u9875\u6570<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

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