{"id":201504,"date":"2025-05-10T09:35:50","date_gmt":"2025-05-10T01:35:50","guid":{"rendered":"https:\/\/server.hk\/cnblog\/201504\/"},"modified":"2025-05-10T09:35:50","modified_gmt":"2025-05-10T01:35:50","slug":"redis%e9%9d%a2%e8%af%95%ef%bc%9a19%e5%9b%be11%e9%a2%98%e5%b8%ae%e4%bd%a0%e9%80%9a%e5%85%b3","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/201504\/","title":{"rendered":"Redis\u9762\u8bd5\uff1a19\u56fe+11\u9898\u5e2e\u4f60\u901a\u5173"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>Redis\u9762\u8bd5\uff1a19\u56fe+11\u9898\u5e2e\u4f60\u901a\u5173<\/h1>\n<p><span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span> <\/p>\n<p><span style=\"color: #222222;font-family:\">\u5404\u4f4d\u5c0f\u4f19\u4f34\u4eec\uff0c\u5927\u5bb6\u597d\u5440\uff01\u770b\u770b\u4eca\u5929\u6211\u53c8\u7ed9\u5404\u4f4d\u5e26\u6765\u4e86\u4ec0\u4e48\u6587\u7ae0\uff1f\u672c\u6587\u6807\u9898<span style=\"color: #222222;font-family:\">\u662f<\/span><span style=\"color: #FF6600;font-family:\">\u300aRedis\u9762\u8bd5\uff1a19\u56fe+11\u9898\u5e2e\u4f60\u901a\u5173\u300b<\/span>\uff0c\u5f88\u660e\u663e\u662f\u5173\u4e8e<span style=\"color: #FF6600;font-family:\">\u6570\u636e\u5e93<\/span>\u7684\u6587\u7ae0\u54c8\u54c8\u54c8\uff0c\u5176\u4e2d\u5185\u5bb9\u4e3b\u8981\u4f1a\u6d89\u53ca\u5230<span style=\"color: #FF6600;font-family:\">Redis\u3001\u9762\u8bd5\u3001\u573a\u666f<\/span>\u7b49\u7b49\uff0c\u5982\u679c\u80fd\u5e2e\u5230\u4f60\uff0c\u89c9\u5f97\u5f88\u4e0d\u9519\u7684\u8bdd\uff0c\u6b22\u8fce\u5404\u4f4d\u591a\u591a\u70b9\u8bc4\u548c\u5206\u4eab\uff01<\/span><\/p>\n<p>&nbsp;<\/p>\n<\/p>\n<p>\u672c\u6587\u8f6c\u8f7d\u81ea\u5fae\u4fe1\u516c\u4f17\u53f7\u300c\u7a0b\u5e8f\u5458jinjunzhu\u300d\uff0c\u4f5c\u8005 jinjunzhu \u3002\u8f6c\u8f7d\u672c\u6587\u8bf7\u8054\u7cfb\u7a0b\u5e8f\u5458jinjunzhu\u516c\u4f17\u53f7\u3002<\/p>\n<p>\u53c8\u5230\u4e86\u91d1\u4e09\u94f6\u56db\u8df3\u69fd\u5b63\uff0c\u597d\u591a\u540c\u5b66\u5df2\u7ecf\u5f00\u59cb\u884c\u52a8\u4e86\u3002\u4eca\u5929\u6211\u6765\u52a9\u529b\u4e00\u628a\uff0c\u9001\u51fa\u8fd9\u5957redis\u9762\u8bd5\u9898\uff0c\u52a9\u529b\u5927\u5bb6\u901a\u5173\u3002<\/p>\n<p><strong>1 redis\u4e3a\u4ec0\u4e48\u54cd\u5e94\u5feb<\/strong><\/p>\n<p><strong>1.1\u6570\u636e\u4fdd\u5b58\u5728\u5185\u5b58\u4e2d<\/strong><\/p>\n<p>redis\u6570\u636e\u4fdd\u5b58\u5728\u5185\u5b58\u4e2d\uff0c\u8bfb\u5199\u64cd\u4f5c\u53ea\u8981\u8bbf\u95ee\u5185\u5b58\uff0c\u4e0d\u9700\u8981\u78c1\u76d8IO\u3002<\/p>\n<p><strong>1.2.\u5e95\u5c42\u6570\u636e\u7ed3\u6784<\/strong><\/p>\n<p>redis\u7684\u6570\u636e\u4ee5key:value\u7684\u683c\u5f0f\u5b58\u50a8\u5728\u6563\u5217\u8868\u4e2d\uff0c\u65f6\u95f4\u590d\u6742\u5ea6o(1)\u3002<\/p>\n<p>redis\u4e3avalue\u5b9a\u4e49\u4e86\u4e30\u5bcc\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5305\u62ec\u6001\u5b57\u7b26\u4e32\u3001\u53cc\u5411\u94fe\u8868\u3001\u538b\u7f29\u5217\u8868\u3001hash\u3001\u8df3\u8868\u548c\u6574\u6570\u6570\u7ec4\uff0c\u53ef\u4ee5\u6839\u636evalue\u7684\u7279\u6027\u9009\u62e9\u9009\u62e9\u6700\u9ad8\u6548\u7684\u6570\u636e\u7ed3\u6784\u3002<\/p>\n<p><strong>1.3.\u5355\u7ebf\u7a0b\u6a21\u578b<\/strong><\/p>\n<p>redis\u7684\u7f51\u7edcIO\u548c\u6570\u636e\u8bfb\u5199\u4f7f\u7528\u5355\u7ebf\u7a0b\u6a21\u578b\uff0c\u53ef\u4ee5\u7ed1\u5b9aCPU\uff0c\u8fd9\u907f\u514d\u4e86\u7ebf\u7a0b\u4e0a\u4e0b\u6587\u5207\u6362\u5e26\u6765\u7684\u5f00\u9500\u3002<\/p>\n<p>\u300c\u6ce8\u610f\uff1aredis6.0\u5bf9\u7f51\u7edc\u8bf7\u6c42\u5f15\u5165\u4e86\u591a\u7ebf\u7a0b\u6a21\u578b\uff0c\u8bfb\u5199\u64cd\u4f5c\u8fd8\u662f\u7528\u5355\u7ebf\u7a0b\u3002\u300d<\/p>\n<p>redis\u591a\u7ebf\u7a0b\u7f51\u7edc\u6a21\u578b\u89c1\u4e0b\u56fe\uff1a<\/p>\n<\/p>\n<p><strong>1.4.IO\u591a\u8def\u590d\u7528<\/strong><\/p>\n<p>redis\u91c7\u7528epoll\u7f51\u7edc\u6a21\u578b\uff0c\u5982\u4e0b\u56fe\uff1a<\/p>\n<\/p>\n<p>\u5185\u6838\u4f1a\u4e00\u76f4\u76d1\u542c\u65b0\u7684socket\u8fde\u63a5\u4e8b\u4ef6\u7684\u548c\u5df2\u5efa\u7acbsocket\u8fde\u63a5\u7684\u8bfb\u5199\u4e8b\u4ef6\uff0c\u628a\u76d1\u542c\u5230\u7684\u4e8b\u4ef6\u653e\u5230\u4e8b\u4ef6\u961f\u5217\uff0credis\u4f7f\u7528\u5355\u7ebf\u7a0b\u4e0d\u505c\u7684\u5904\u7406\u8fd9\u4e2a\u4e8b\u4ef6\u961f\u5217\u3002\u8fd9\u907f\u514d\u4e86\u963b\u585e\u7b49\u5f85\u8fde\u63a5\u548c\u8bfb\u5199\u4e8b\u4ef6\u5230\u6765\u3002<\/p>\n<p>\u8fd9\u4e9b\u4e8b\u4ef6\u7ed1\u5b9a\u4e86\u56de\u8c03\u51fd\u6570\uff0c\u4f1a\u8c03\u7528redis\u7684\u5904\u7406\u51fd\u6570\u8fdb\u884c\u5904\u7406\u3002<\/p>\n<p><strong>2 redis\u5e95\u5c42\u6570\u636e\u7ed3\u6784<\/strong><\/p>\n<p>redis\u67095\u79cd\u6570\u636e\u7c7b\u578b\uff0c\u5305\u62ec\u300c\u5b57\u7b26\u4e32\u3001\u5217\u8868\u3001\u96c6\u5408\u3001\u6709\u5e8f\u96c6\u5408\u548c\u5b57\u5178\u300d\u3002<\/p>\n<p>redis\u5e95\u5c42\u7684\u6570\u636e\u7ed3\u6784\u67096\u79cd\uff0c\u5305\u62ec\u300c\u52a8\u6001\u5b57\u7b26\u4e32\u3001\u53cc\u5411\u94fe\u8868\u3001\u538b\u7f29\u5217\u8868(ziplist)\u3001hash\u8868\u3001\u8df3\u8868(skip list)\u548c\u6574\u6570\u6570\u7ec4\u300d\u3002<\/p>\n<p>redis\u6570\u636e\u7c7b\u578b\u548c\u5e95\u5c42\u6570\u636e\u7ed3\u6784\u6709\u5982\u4e0b\u5bf9\u5e94\u5173\u7cfb:<\/p>\n<\/p>\n<p><strong>2.1.\u5b57\u7b26\u4e32\u7c7b\u578b<\/strong><\/p>\n<p>\u5e95\u5c42\u6570\u636e\u7ed3\u6784\u662f\u52a8\u6001\u5b57\u7b26\u4e32\u3002<\/p>\n<p><strong>2.2.\u5217\u8868<\/strong><\/p>\n<p>\u5982\u679c\u540c\u65f6\u6ee1\u8db3\u4e0b\u9762\u6761\u4ef6\uff0c\u5c31\u4f7f\u7528\u538b\u7f29\u5217\u8868\uff0c\u5426\u5219\u4f7f\u7528\u53cc\u5411\u94fe\u8868\u3002<\/p>\n<ul>\n<li>\n<p>\u5217\u8868\u4e2d\u5355\u4e2a\u5143\u7d20\u5c0f\u4e8e64\u5b57\u8282<\/p>\n<\/li>\n<li>\n<p>\u5217\u8868\u4e2d\u5143\u7d20\u4e2a\u6570\u5c11\u4e8e 512<\/p>\n<\/li>\n<\/ul>\n<p>\u300c\u538b\u7f29\u5217\u8868\u300d\u5728\u5185\u5b58\u4e2d\u662f\u4e00\u5757\u513f\u8fde\u7eed\u7684\u5185\u5b58\u7a7a\u95f4\uff0c\u7ed3\u6784\u5982\u4e0b\uff1a<\/p>\n<\/p>\n<p>\u300c\u538b\u7f29\u5217\u8868\u67e5\u627e\u65f6\u95f4\u590d\u6742\u5ea6\u662fo(n)\u300d<\/p>\n<p><strong>2.3.\u96c6\u5408<\/strong><\/p>\n<p>\u5982\u679c\u540c\u65f6\u6ee1\u8db3\u4e0b\u9762\u6761\u4ef6\uff0c\u5c31\u4f7f\u7528\u6709\u5e8f\u6574\u6570\u6570\u7ec4\uff0c\u5426\u5219\u4f7f\u7528hash\u8868\u3002<\/p>\n<ul>\n<li>\n<p>\u96c6\u5408\u4e2d\u5143\u7d20\u90fd\u662f\u6574\u6570\u7c7b\u578b<\/p>\n<\/li>\n<li>\n<p>\u96c6\u5408\u4e2d\u5143\u7d20\u4e2a\u6570\u4e0d\u8d85\u8fc7512\u4e2a<\/p>\n<\/li>\n<\/ul>\n<p><strong>2.4.\u6709\u5e8f\u96c6\u5408<\/strong><\/p>\n<p>\u5982\u679c\u540c\u65f6\u6ee1\u8db3\u4e0b\u97622\u4e2a\u6761\u4ef6\uff0c\u5c31\u4f7f\u7528\u538b\u7f29\u5217\u8868\uff0c\u5426\u5219\u4f7f\u7528\u8df3\u8868\u3002<\/p>\n<ul>\n<li>\n<p>\u96c6\u5408\u4e2d\u5143\u7d20\u90fd\u5c0f\u4e8e64\u5b57\u8282<\/p>\n<\/li>\n<li>\n<p>\u96c6\u5408\u4e2d\u5143\u7d20\u4e2a\u6570\u5c0f\u4e8e128\u4e2a<\/p>\n<\/li>\n<\/ul>\n<p>\u300c\u6ce8\u610f\uff1a\u6709\u5e8f\u96c6\u5408\u8fd8\u6709\u4e00\u4e2aHASH\u8868\u7528\u4e8e\u4fdd\u5b58\u96c6\u5408\u4e2d\u5143\u7d20\u7684\u5206\u6570\uff0c\u505aZSCORE\u64cd\u4f5c\u65f6\uff0c\u67e5\u8be2\u7684\u5c31\u662f\u8fd9\u4e2aHASH\u8868\uff0c\u6240\u4ee5\u6548\u7387\u5f88\u9ad8\u3002\u300d<\/p>\n<p>\u300c\u8df3\u8868\u300d\u7684\u7ed3\u6784\u5982\u4e0b\uff1a<\/p>\n<\/p>\n<p>\u5982\u679c\u4e0d\u52a0\u7d22\u5f15\uff0c\u67e5\u627e10\u8fd9\u4e2a\u6570\u5b57\u9700\u8981\u67e5\u8be210\u6b21\uff0c\u4f7f\u7528\u4e86\u4e8c\u7ea7\u7d22\u5f15\uff0c\u67e5\u627e10\u8fd9\u4e2a\u6570\u5b57\u9700\u89815\u6b21\uff0c\u800c\u4f7f\u7528\u4e00\u7ea7\u7d22\u5f15\uff0c\u9700\u8981\u67e5\u8be23\u6b21\u3002<\/p>\n<p>\u8df3\u8868\u7684\u6bcf\u4e00\u5c42\u90fd\u662f\u4e00\u4e2a\u6709\u5e8f\u94fe\u8868\uff0c\u6700\u4e0b\u9762\u4e00\u5c42\u4fdd\u5b58\u4e86\u5168\u90e8\u6570\u636e\u3002\u8df3\u8868\u63d2\u5165\u3001\u5220\u9664\u3001\u67e5\u8be2\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u662fo(logN)\u3002\u8df3\u8868\u9700\u8981\u5b58\u50a8\u989d\u5916\u7684\u7d22\u5f15\u8282\u70b9\uff0c\u4f1a\u589e\u52a0\u989d\u5916\u7684\u7a7a\u95f4\u5f00\u9500\u3002<\/p>\n<p><strong>2.5.\u5b57\u5178<\/strong><\/p>\n<p>\u5982\u679c\u540c\u65f6\u6ee1\u8db3\u4e0b\u97622\u4e2a\u6761\u4ef6\uff0c\u5c31\u4f7f\u7528\u538b\u7f29\u5217\u8868\uff0c\u5426\u5219\u4f7f\u7528hash\u8868\u3002<\/p>\n<ul>\n<li>\n<p>\u5b57\u5178\u4e2d\u6bcf\u4e2aentry\u7684key\/value\u90fd\u5c0f\u4e8e64\u5b57\u8282<\/p>\n<\/li>\n<li>\n<p>\u5b57\u5178\u4e2d\u5143\u7d20\u4e2a\u6570\u5c0f\u4e8e512\u4e2a<\/p>\n<\/li>\n<\/ul>\n<p><strong>3 redis\u7f13\u5b58\u6dd8\u6c70\u7b56\u7565<\/strong><\/p>\n<p>redis\u603b\u5171\u67098\u79cd\u6dd8\u6c70\u7b56\u7565\uff0c\u5982\u4e0b\u56fe\uff1a<\/p>\n<\/p>\n<p>volatile-lfu\u548callkeys-lfu\u7b56\u7565\u662f4.0\u7248\u672c\u65b0\u589e\u7684\u3002<\/p>\n<ul>\n<li>\n<p>\u300clru\u300d\u662f\u6309\u7167\u6570\u636e\u7684\u6700\u8fd1\u6700\u5c11\u8bbf\u95ee\u539f\u5219\u6765\u6dd8\u6c70\u6570\u636e\uff0c\u53ef\u80fd\u5b58\u5728\u7684\u95ee\u9898\u662f\u5982\u679c\u5927\u6279\u91cf\u51b7\u6570\u636e\u6700\u8fd1\u88ab\u8bbf\u95ee\u4e86\u4e00\u6b21\uff0c\u5c31\u4f1a\u5360\u7528\u5927\u91cf\u5185\u5b58\u7a7a\u95f4\uff0c\u5982\u679c\u7f13\u5b58\u6ee1\u4e86\uff0c\u90e8\u5206\u70ed\u6570\u636e\u5c31\u4f1a\u88ab\u6dd8\u6c70\u6389\u3002<\/p>\n<\/li>\n<li>\n<p>\u300clfu\u300d\u662f\u6309\u7167\u6570\u636e\u7684\u6700\u5c0f\u8bbf\u95ee\u9891\u7387\u8bbf\u95ee\u6b21\u6570\u539f\u5219\u6765\u6dd8\u6c70\u6570\u636e\uff0c\u5982\u679c\u4e24\u4e2a\u6570\u636e\u7684\u8bbf\u95ee\u6b21\u6570\u76f8\u540c\uff0c\u5219\u628a\u8bbf\u95ee\u65f6\u95f4\u8f83\u65e9\u7684\u6570\u636e\u6dd8\u6c70\u3002<\/p>\n<\/li>\n<\/ul>\n<p><strong>4 redis\u6570\u636e\u6301\u4e45\u5316<\/strong><\/p>\n<p>redis\u6301\u4e45\u5316\u7684\u65b9\u5f0f\u67092\u79cd\uff0c\u4e00\u79cd\u662f\u5199\u540e\u65e5\u5fd7(AOF),\u4e00\u79cd\u662f\u5185\u5b58\u5feb\u7167(RDB)\u3002<\/p>\n<p><strong>4.1.AOF\u65e5\u5fd7<\/strong><\/p>\n<p>AOF\u65e5\u5fd7\u8bb0\u5f55\u4e86\u6bcf\u4e00\u6761\u6536\u5230\u7684\u547d\u4ee4\uff0credis\u6545\u969c\u5b95\u673a\u6062\u590d\u65f6\uff0c\u53ef\u4ee5\u52a0\u8f7dAOF\u65e5\u5fd7\u4e2d\u7684\u547d\u4ee4\u8fdb\u884c\u91cd\u653e\u6765\u8fdb\u884c\u6545\u969c\u6062\u590d\u3002AOF\u67093\u79cd\u540c\u6b65\u7b56\u7565\uff0c\u5982\u4e0b\u56fe\uff1a\u56fe\u7247<\/p>\n<p>\u5982\u679c\u4e0d\u662f\u5bf9\u4e22\u5931\u6570\u636e\u7279\u522b\u654f\u611f\u7684\u4e1a\u52a1\uff0c\u63a8\u8350\u4f7f\u7528everysec\uff0c\u5bf9\u4e3b\u7ebf\u7a0b\u7684\u963b\u585e\u5c11\uff0c\u6545\u969c\u540e\u4e22\u5931\u6570\u636e\u53ea\u67091s\u3002<\/p>\n<p><strong>4.2.RDB\u5feb\u7167<\/strong><\/p>\n<p>RDB\u5feb\u7167\u662f\u4e00\u4e2a\u5185\u5b58\u5feb\u7167,\u8bb0\u5f55\u4e86redis\u67d0\u4e00\u65f6\u523b\u7684\u5168\u90e8\u6570\u636e\u3002<\/p>\n<p><strong>4.3.\u6df7\u5408\u65e5\u5fd7<\/strong><\/p>\n<p>\u4eceredis4.0\u5f00\u59cb\uff0cAOF\u6587\u4ef6\u4e5f\u53ef\u4ee5\u4fdd\u5b58RDB\u5feb\u7167\uff0cAOF\u91cd\u5199\u7684\u65f6\u5019redis\u4f1a\u628aAOF\u6587\u4ef6\u5185\u5bb9\u6e05\u7a7a\uff0c\u5148\u8bb0\u5f55\u4e00\u4efdRDB\u5feb\u7167\uff0c\u8fd9\u4efd\u6570\u636e\u4ee5&#8221;REDIS&#8221;\u5f00\u5934\u3002\u8bb0\u5f55RDB\u5185\u5bb9\u540e\uff0cAOF\u6587\u4ef6\u4f1a\u63a5\u7740\u8bb0\u5f55AOF\u547d\u4ee4\u3002\u6545\u969c\u6062\u590d\u65f6\uff0c\u5148\u52a0\u8f7dAOF\u6587\u4ef6\u4e2dRDB\u5feb\u7167\uff0c\u7136\u540e\u56de\u653eAOF\u6587\u4ef6\u4e2d\u540e\u9762\u7684\u547d\u4ee4\u3002<\/p>\n<p><strong>4.4.\u4e3b\u4ece\u540c\u6b65<\/strong><\/p>\n<p>redis\u4e3b\u4ece\u540c\u6b65\u65f6\uff0c\u4e3b\u8282\u70b9\u4f1a\u5148\u751f\u6210\u4e00\u4efdRDB\u5feb\u7167\u53d1\u9001\u7ed9\u4ece\u8282\u70b9\uff0c\u628a\u5feb\u7167\u4e4b\u540e\u7684\u547d\u4ee4\u5199\u5165\u4e3b\u4ece\u540c\u6b65\u7f13\u5b58\u533a(replication &nbsp;buffer)\uff0c\u4ece\u8282\u70b9\u628aRDB\u6587\u4ef6\u52a0\u8f7d\u5b8c\u6210\u540e\uff0c\u4e3b\u8282\u70b9\u628a\u7f13\u5b58\u533a\u547d\u4ee4\u53d1\u9001\u7ed9\u4ece\u8282\u70b9\u3002<\/p>\n<p><strong>4.5.AOF\u91cd\u5199<\/strong><\/p>\n<p>AOF\u65e5\u5fd7\u662f\u7528\u8bb0\u5f55\u547d\u4ee4\u7684\u65b9\u5f0f\u8ffd\u52a0\u7684\uff0c\u8fd9\u6837\u53ef\u80fd\u5b58\u5728\u5bf9\u540c\u4e00\u4e2akey\u7684\u591a\u6761\u547d\u4ee4\uff0c\u8fd9\u4e9b\u547d\u4ee4\u662f\u53ef\u4ee5\u5408\u5e76\u62101\u6761\u7684\u3002\u6bd4\u5982\u5bf9\u540c\u4e00\u4e2akey\u7684\u591a\u4e2aset\u64cd\u4f5c\u65e5\u5fd7\uff0c\u53ef\u4ee5\u5408\u6210\u4e00\u6761\u3002<\/p>\n<p><strong>4.6.\u963b\u585e\u70b9<\/strong><\/p>\n<p>AOF\u91cd\u5199\u548cRDB\u5feb\u7167\u6267\u884c\u7684\u8fc7\u7a0b\u4e2d\uff0credis\u90fd\u4f1afork\u4e00\u4e2a\u5b50\u8fdb\u7a0b\u6765\u6267\u884c\u64cd\u4f5c\uff0c\u5b50\u8fdb\u7a0b\u6267\u884c\u8fc7\u7a0b\u4e2d\u662f\u4e0d\u662f\u963b\u585e\u4e3b\u7ebf\u7a0b\u7684\u3002<\/p>\n<p>\u300c\u4f46\u662f\u8981\u6ce8\u610f2\u70b9\uff1a\u300d<\/p>\n<p>fork\u5b50\u8fdb\u7a0b\u7684\u8fc7\u7a0b\u4e2d\uff0credis\u4e3b\u7ebf\u7a0b\u4f1a\u62f7\u8d1d\u4e00\u4efd\u5185\u5b58\u9875\u8868(\u8bb0\u5f55\u4e86\u865a\u62df\u5185\u5b58\u548c\u7269\u7406\u5185\u5b58\u7684\u6620\u5c04\u5173\u7cfb)\u7ed9\u5b50\u8fdb\u7a0b\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u662f\u963b\u585e\u7684\uff0credis\u4e3b\u7ebf\u7a0b\u5185\u5b58\u8d8a\u5927\uff0c\u963b\u585e\u65f6\u95f4\u8d8a\u957f;<\/p>\n<p>\u5b50\u8fdb\u7a0b\u548credis\u4e3b\u7ebf\u7a0b\u5171\u7528\u4e00\u5757\u513f\u7269\u7406\u5185\u5b58\uff0c\u5982\u679c\u65b0\u7684\u8bf7\u6c42\u5230\u6765\uff0c\u5fc5\u987b\u4f7f\u7528copy on &nbsp;write\u7684\u65b9\u5f0f\uff0c\u62f7\u8d1d\u8981\u4fee\u6539\u7684\u6570\u636e\u9875\u5230\u65b0\u7684\u5185\u5b58\u7a7a\u95f4\u8fdb\u884c\u4fee\u6539\u3002\u5982\u4e0b\u56fe\uff1a<\/p>\n<\/p>\n<p>\u6ce8\u610f:\u5982\u679c\u5f00\u542f\u4e86\u5185\u5b58\u5927\u9875\uff0c\u6bcf\u6b21\u62f7\u8d1d\u90fd\u9700\u8981\u5206\u914d2MB\u7684\u5185\u5b58\u3002<\/p>\n<p><strong>5 redis\u9ad8\u53ef\u7528<\/strong><\/p>\n<p>\u4e0b\u56fe\u662f\u4e00\u4e2a\u300c\u4e00\u4e3b\u4e8c\u4ece\u4e09\u54e8\u5175\u300d\u7684\u67b6\u6784\u56fe:<\/p>\n<\/p>\n<p>\u4ece\u56fe\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u54e8\u5175\u4e4b\u95f4\u3001\u54e8\u5175\u548c\u4e3b\u4ece\u8282\u70b9\u4e4b\u95f4\u3001\u54e8\u5175\u548c\u5ba2\u6237\u7aef\u4e4b\u95f4\u90fd\u5efa\u7acb\u4e86\u8fde\u63a5\u3002<\/p>\n<p>\u5982\u679c\u4e3b\u8282\u70b9\u6302\u4e86\uff0c\u54e8\u5175\u96c6\u7fa4\u9700\u8981\u5b8c\u6210\u4e3b\u4ece\u5207\u6362\uff0c\u5982\u4e0b\u56fe\uff1a<\/p>\n<\/p>\n<p>\u4e0b\u9762\u6211\u4eec\u4f9d\u6b21\u6765\u804a\u4e00\u4e0b\u8fd94\u4e2a\u6b65\u9aa4\u300c5.1~5.4\u300d\u3002<\/p>\n<p><strong>5.1.\u5224\u65ad\u4e3b\u8282\u70b9\u4e0b\u7ebf<\/strong><\/p>\n<p>\u5f53\u4e00\u4e2a\u54e8\u5175\u76d1\u63a7\u5230\u4e3b\u8282\u70b9\u4e0b\u7ebf\u65f6\uff0c\u5c31\u4f1a\u7ed9\u5176\u4ed6\u54e8\u5175\u53d1\u9001\u786e\u8ba4\u547d\u4ee4\uff0c\u5176\u4ed6\u547d\u4ee4\u4f1a\u6839\u636e\u81ea\u5df1\u7684\u5224\u65ad\u56de\u590d&#8221;Y&#8221;\u6216&#8221;N&#8221;\u3002<\/p>\n<p>\u5982\u679c\u6709n\/2 + 1\u4ee5\u4e0a\u6570\u91cf\u7684\u54e8\u5175\u90fd\u8ba4\u4e3a\u4e3b\u8282\u70b9\u4e0b\u7ebf\u4e86\uff0c\u624d\u4f1a\u5224\u5b9a\u4e3b\u8282\u70b9\u4e0b\u7ebf\u3002\u8fd9\u91cc\u7684n\u662f\u54e8\u5175\u96c6\u7fa4\u7684\u6570\u91cf\u3002<\/p>\n<p>n\/2 + 1\u8fd9\u4e2a\u53c2\u6570\u7531quorum\u53c2\u6570\u914d\u7f6e\uff0c\u6bd4\u5982\u67095\u4e2a\u54e8\u5175\uff0c\u8fd9\u91cc\u4e00\u822c\u914d\u7f6e\u62103\u3002\u4e5f\u53ef\u4ee5\u914d\u7f6e\u6210\u5176\u4ed6\u503c\u3002<\/p>\n<p><strong>5.2.\u9009\u4e3e\u65b0\u4e3b\u8282\u70b9<\/strong><\/p>\n<p>\u4e3b\u8282\u70b9\u88ab\u5224\u5b9a\u4e0b\u7ebf\u540e\uff0c\u54e8\u5175\u96c6\u7fa4\u4f1a\u91cd\u65b0\u9009\u62e9\u65b0\u7684\u4e3b\u8282\u70b9\u3002<\/p>\n<p><strong>5.2.1 \u6dd8\u6c70\u4e0d\u7a33\u5b9a\u4ece\u8282\u70b9<\/strong><\/p>\n<p>\u6839\u636e\u914d\u7f6e\u53c2\u6570down-after-milliseconds * 10\u6765\u6dd8\u6c70\u3002<\/p>\n<p>\u300cdown-after-milliseconds\u300d\u8868\u793a\u4e3b\u4ece\u8282\u70b9\u65ad\u5f00\u65f6\u95f4\uff0c10\u8868\u793a\u6b21\u6570\uff0c\u5982\u679c\u4ece\u8282\u70b9\u8ddf\u4e3b\u8282\u70b9\u65ad\u5f00\u65f6\u95f4\u8d85\u8fc7down-after-milliseconds\u7684\u6b21\u6570\u8fbe\u5230\u4e8610\u6b21\u4ee5\u4e0a\uff0c\u4ece\u8282\u70b9\u5c31\u88ab\u6dd8\u6c70\u4e86\u3002<\/p>\n<p><strong>5.2.2 slave-priority\u53c2\u6570<\/strong><\/p>\n<p>\u300cslave-priority\u300d\u53c2\u6570\u914d\u7f6e\u4e86\u4ece\u8282\u70b9\u7684\u4f18\u5148\u7ea7\uff0c\u9009\u62e9\u4ece\u8282\u70b9\u65f6\u54e8\u5175\u4f1a\u4f18\u5148\u9009\u62e9\u4f18\u5148\u7ea7\u9ad8\u7684\u4ece\u8282\u70b9\u3002<\/p>\n<p><strong>5.2.3 \u590d\u5236\u8fdb\u5ea6<\/strong><\/p>\n<p>redis\u6709\u4e00\u4e2a\u8bb0\u5f55\u4e3b\u4ece\u589e\u91cf\u590d\u5236\u7684\u7f13\u5b58\u533a\u53ebrepl_backlog_buffer\uff0c\u8fd9\u662f\u4e00\u4e2a\u73af\u5f62\u7ed3\u6784\u7684\u7f13\u51b2\u533a\uff0c\u5982\u4e0b\u56fe\uff1a<\/p>\n<\/p>\n<p>\u4e3b\u8282\u70b9\u6709\u4e00\u4e2a\u5199\u504f\u79fb\u91cfmaster_repl_offset\uff0c\u4ece\u8282\u70b9\u4e5f\u6709\u4e00\u4e2a\u504f\u79fb\u91cfslave_repl_offset\u3002\u4f18\u5148\u9009\u62e9slave_repl_offset\u6700\u63a5\u8fd1master_repl_offset\u7684\u4ece\u8282\u70b9\u4f5c\u4e3a\u65b0\u7684\u4e3b\u8282\u70b9\u3002<\/p>\n<p>\u6240\u4ee5\uff0c\u4e0a\u56fe\u4e2d\u504f\u79fb\u91cf\u4e3a114\u7684\u4ece\u8282\u70b9\u4f18\u5148\u88ab\u9009\u4e3a\u65b0\u7684\u4e3b\u8282\u70b9\u3002<\/p>\n<p><strong>5.2.4 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redis\u4e3a\u4ec0\u4e48\u53d8\u6162\u4e86<\/strong><\/p>\n<p>redis\u53d8\u6162\u4e86\u7684\u539f\u56e0\u6709\u5f88\u591a\uff0c\u603b\u7ed3\u4e00\u4e0b\u670911\u4e2a\uff0c\u89c1\u4e0b\u56fe\uff1a<\/p>\n<\/p>\n<p>\u4ece\u56fe\u4e2d\u770b\u51fa\uff0credis\u53d8\u6162\u539f\u56e0\u4e3b\u8981\u6709\u4e24\u7c7b\uff1a\u300c\u963b\u585e\u4e3b\u7ebf\u7a0b\u548c\u64cd\u4f5c\u7cfb\u7edf\u9650\u5236\u300d\u3002<\/p>\n<p><strong>6.1\u4e3b\u7ebf\u7a0b\u963b\u585e<\/strong><\/p>\n<p><strong>6.1.1.AOF\u91cd\u5199\u548cRDB\u5feb\u7167<\/strong><\/p>\n<p>\u524d\u9762\u5df2\u7ecf\u8bb2\u8fc7\u4e86\uff0credis\u5728AOF\u91cd\u5199\u65f6\uff0c\u4e3b\u7ebf\u7a0b\u4f1afork\u51fa\u4e00\u4e2abgrewriteaof\u5b50\u8fdb\u7a0b\u3002<\/p>\n<p>redis\u8fdb\u884cRDB\u5feb\u7167\u65f6\u4e3b\u7ebf\u7a0b\u4f1afork\u51fa\u4e00\u4e2abgsave\u5b50\u8fdb\u7a0b\u3002<\/p>\n<p>\u8fd9\u4e24\u4e2a\u64cd\u4f5c\u8868\u9762\u4e0a\u770b\u4e0d\u963b\u585e\u4e3b\u7ebf\u7a0b\uff0c\u4f46fork\u5b50\u8fdb\u7a0b\u7684\u8fd9\u4e2a\u8fc7\u7a0b\u662f\u5728\u4e3b\u7ebf\u7a0b\u5b8c\u6210\u7684\u3002fork\u5b50\u8fdb\u7a0b\u65f6redis\u9700\u8981\u62f7\u8d1d\u5185\u5b58\u9875\u8868\uff0c\u5982\u679credis\u5b9e\u4f8b\u5f88\u5927\uff0c\u8fd9\u4e2a\u62f7\u8d1d\u4f1a\u8017\u8d39\u5927\u91cf\u7684CPU\u8d44\u6e90\uff0c\u963b\u585e\u4e3b\u7ebf\u7a0b\u7684\u65f6\u95f4\u4e5f\u4f1a\u53d8\u957f\u3002<\/p>\n<p><strong>6.1.2.\u5185\u5b58\u5927\u9875<\/strong><\/p>\n<p>redis\u9ed8\u8ba4\u652f\u6301\u5185\u5b58\u5927\u9875\u662f2MB\uff0c\u4f7f\u7528\u5185\u5b58\u5927\u9875\uff0c\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u53ef\u4ee5\u51cf\u5c11redis\u7684\u5185\u5b58\u5206\u914d\u6b21\u6570\uff0c\u4f46\u662f\u5bf9\u6570\u636e\u6301\u4e45\u5316\u4f1a\u6709\u4e00\u5b9a\u5f71\u54cd\u3002<\/p>\n<p>redis\u5728AOF\u91cd\u5199\u548cRDB\u5feb\u7167\u8fc7\u7a0b\u4e2d\uff0c\u5982\u679c\u4e3b\u7ebf\u7a0b\u6536\u5230\u65b0\u7684\u5199\u8bf7\u6c42\uff0c\u5c31\u9700\u8981CopyOnWrite\u3002\u4f7f\u7528\u4e86\u5185\u5b58\u5927\u9875\uff0c\u5373\u4f7fredis\u53ea\u4fee\u6539\u5176\u4e2d\u4e00\u4e2a\u5927\u5c0f\u662f1kb\u7684key\uff0c\u4e5f\u9700\u8981\u62f7\u8d1d\u4e00\u6574\u9875\u7684\u6570\u636e\uff0c\u53732MB\u3002\u5728\u5199\u5165\u91cf\u8f83\u591a\u65f6\uff0c\u5927\u91cf\u62f7\u8d1d\u5c31\u4f1a\u5bfc\u81f4redis\u6027\u80fd\u4e0b\u964d\u3002<\/p>\n<p><strong>6.1.3.\u547d\u4ee4\u590d\u6742\u5ea6\u9ad8<\/strong><\/p>\n<p>\u6267\u884c\u590d\u6742\u5ea6\u9ad8\u7684\u547d\u4ee4\u662f\u9020\u6210redis\u963b\u585e\u7684\u5e38\u89c1\u539f\u56e0\u3002\u6bd4\u5982\u5bf9\u4e00\u4e2aset\u6216\u8005list\u6570\u636e\u7c7b\u578b\u6267\u884cSORT\u64cd\u4f5c\uff0c\u590d\u6742\u5ea6\u662fO(N+M*log(M))\u3002<\/p>\n<p><strong>6.1.4.bigkey\u64cd\u4f5c<\/strong><\/p>\n<p>\u5982\u679c\u4e00\u4e2akey\u7684value\u975e\u5e38\u5927\uff0c\u521b\u5efa\u7684\u65f6\u5019\u5206\u914d\u5185\u5b58\u4f1a\u5f88\u8017\u65f6\uff0c\u5220\u9664\u7684\u65f6\u5019\u91ca\u653e\u5185\u5b58\u4e5f\u5f88\u8017\u65f6\u3002<\/p>\n<p>redis4.0\u4ee5\u540e\u5f15\u5165\u4e86layfree\u673a\u5236\uff0c\u53ef\u4ee5\u4f7f\u7528\u5b50\u8fdb\u7a0b\u5f02\u6b65\u5220\u9664\uff0c\u4ece\u800c\u4e0d\u5f71\u54cd\u4e3b\u7ebf\u7a0b\u6267\u884c\u3002\u7528UNLINK\u547d\u4ee4\u66ff\u4ee3DEL\u547d\u4ee4\uff0c\u5c31\u53ef\u4ee5\u4f7f\u7528\u5b50\u8fdb\u7a0b\u5f02\u6b65\u5220\u9664\u3002<\/p>\n<p>redis6.0\u589e\u52a0\u4e86\u914d\u7f6e\u9879lazyfree-lazy-user-del\uff0c\u914d\u7f6e\u6210yes\u540e\uff0cdel\u547d\u4ee4\u4e5f\u53ef\u4ee5\u7528\u5b50\u8fdb\u7a0b\u5f02\u6b65\u5220\u9664\u3002<\/p>\n<p>\u5982\u679clazyfree-lazy-user-del\u4e0d\u8bbe\u7f6e\u4e3ayes\uff0c\u90a3redis\u662f\u5426\u91c7\u7528\u5f02\u6b65\u5220\u9664\uff0c\u662f\u8981\u770b\u5220\u9664\u7684\u65f6\u673a\u7684\u3002\u5bf9\u4e8eString\u7c7b\u578b\u548c\u5e95\u5c42\u91c7\u7528\u6574\u6570\u6570\u7ec4\u548c\u538b\u7f29\u5217\u8868\u7684\u6570\u636e\u7c7b\u578b\uff0credis\u662f\u4e0d\u4f1a\u91c7\u7528\u5f02\u6b65\u5220\u9664\u7684\u3002<\/p>\n<p><strong>6.1.5.\u4ece\u8282\u70b9\u5168\u91cf\u540c\u6b65<\/strong><\/p>\n<p>\u4ece\u8282\u70b9\u5168\u91cf\u540c\u6b65\u8fc7\u7a0b\u4e2d\uff0c\u9700\u8981\u5148\u6e05\u9664\u5185\u5b58\u4e2d\u7684\u6570\u636e\uff0c\u7136\u540e\u518d\u52a0\u8f7dRDB\u6587\u4ef6\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\u662f\u963b\u585e\u7684\uff0c\u5982\u679c\u6709\u8bfb\u8bf7\u6c42\u5230\u6765\uff0c\u53ea\u80fd\u7b49\u5230\u52a0\u8f7dRDB\u6587\u4ef6\u5b8c\u6210\u540e\u624d\u80fd\u5904\u7406\u8bf7\u6c42\uff0c\u6240\u4ee5\u54cd\u5e94\u4f1a\u5f88\u6162\u3002<\/p>\n<p>\u53e6\u5916\uff0c\u5982\u679credis\u5b9e\u4f8b\u5f88\u5927\uff0c\u4e5f\u4f1a\u9020\u6210RDB\u6587\u4ef6\u592a\u5927\uff0c\u4ece\u5e93\u52a0\u8f7d\u65f6\u95f4\u957f\u3002\u6240\u4ee5\u5c3d\u91cf\u4fdd\u6301redis\u5b9e\u4f8b\u4e0d\u8981\u592a\u5927\uff0c\u6bd4\u5982\u5355\u4e2a\u5b9e\u4f8b\u9650\u52364G\uff0c\u5982\u679c\u8d85\u51fa\u5c31\u91c7\u7528\u5207\u7247\u96c6\u7fa4\u3002<\/p>\n<p><strong>6.1.6.AOF\u540c\u6b65\u5199\u76d8<\/strong><\/p>\n<p>appendfsync\u7b56\u7565\u67093\u79cd\uff1aalways\u3001everysec\u3001no\uff0c\u5982\u679c\u91c7\u7528always\uff0c\u6bcf\u4e2a\u547d\u4ee4\u90fd\u4f1a\u540c\u6b65\u5199\u76d8\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u662f\u963b\u585e\u7684\uff0c\u7b49\u5199\u76d8\u6210\u529f\u540e\u624d\u80fd\u5904\u7406\u4e0b\u4e00\u6761\u547d\u4ee4\u3002<\/p>\n<p>\u9664\u975e\u662f\u4e25\u683c\u4e0d\u80fd\u4e22\u6570\u636e\u7684\u573a\u666f\uff0c\u5426\u5219\u5c3d\u91cf\u4e0d\u8981\u9009\u62e9always\u7b56\u7565\uff0c\u63a8\u8350\u5c3d\u91cf\u9009\u62e9everysec\u7b56\u7565\uff0c\u5982\u679c\u5bf9\u4e22\u5931\u6570\u636e\u4e0d\u654f\u611f\uff0c\u53ef\u4ee5\u91c7\u7528no\u3002<\/p>\n<p><strong>6.1.7.\u5185\u5b58\u8fbe\u5230maxmemory<\/strong><\/p>\n<p>\u5185\u5b58\u8fbe\u5230maxmemory\uff0c\u9700\u8981\u4f7f\u7528\u6dd8\u6c70\u7b56\u7565\u6765\u6dd8\u6c70\u90e8\u5206key\u3002\u5373\u4f7f\u91c7\u7528lazyfree\u5f02\u6b65\u5220\u9664\uff0c\u9009\u62e9key\u7684\u8fc7\u7a0b\u4e5f\u662f\u963b\u585e\u7684\u3002<\/p>\n<p>\u53ef\u4ee5\u9009\u62e9\u8f83\u5feb\u7684\u6dd8\u6c70\u7b56\u7565\uff0c\u6bd4\u5982\u7528\u968f\u673a\u6dd8\u6c70\u6765\u66ff\u6362LRU\u548cLFU\u7b97\u6cd5\u6dd8\u6c70\u3002\u4e5f\u53ef\u4ee5\u6269\u5927\u5207\u7247\u6570\u91cf\u6765\u51cf\u8f7b\u6dd8\u6c70key\u7684\u65f6\u95f4\u6d88\u8017\u3002<\/p>\n<p><strong>6.2\u64cd\u4f5c\u7cfb\u7edf\u9650\u5236<\/strong><\/p>\n<p><strong>6.2.1.\u4f7f\u7528\u4e86swap<\/strong><\/p>\n<p>\u4f7f\u7528swap\u7684\u539f\u56e0\u662f\u64cd\u4f5c\u7cfb\u7edf\u4e0d\u80fd\u7ed9redis\u5206\u914d\u8db3\u591f\u5927\u7684\u5185\u5b58\uff0c\u5982\u679c\u64cd\u4f5c\u5176\u4ed6\u5f00\u542f\u4e86swap\uff0c\u5185\u5b58\u6570\u636e\u5c31\u9700\u8981\u4e0d\u505c\u5730\u8ddfswap\u6362\u5165\u548c\u6362\u51fa\uff0c\u5bf9\u6027\u80fd\u5f71\u54cd\u975e\u5e38\u5927\u3002<\/p>\n<p>\u64cd\u4f5c\u7cfb\u7edf\u6ca1\u6709\u80fd\u529b\u5206\u914d\u5185\u5b58\u7684\u539f\u56e0\u4e5f\u53ef\u80fd\u662f\u5176\u4ed6\u8fdb\u7a0b\u4f7f\u7528\u4e86\u5927\u91cf\u7684\u5185\u5b58\u3002<\/p>\n<p><strong>6.2.2.\u7f51\u7edc\u95ee\u9898<\/strong><\/p>\n<p>\u5982\u679c\u7f51\u5361\u8d1f\u8f7d\u5f88\u5927\uff0c\u5bf9redis\u6027\u80fd\u5f71\u54cd\u4f1a\u5f88\u5927\u3002\u8fd9\u4e00\u65b9\u9762\u6709\u53ef\u80fdredis\u7684\u8bbf\u95ee\u91cf\u786e\u5b9e\u5f88\u9ad8\uff0c\u53e6\u4e00\u65b9\u9762\u4e5f\u53ef\u80fd\u662f\u6709\u5176\u4ed6\u6d41\u91cf\u5927\u7684\u7a0b\u5e8f\u5360\u7528\u4e86\u5e26\u5bbd\u3002<\/p>\n<p>\u8fd9\u4e2a\u6700\u597d\u4ece\u8fd0\u7ef4\u5c42\u9762\u8fdb\u884c\u76d1\u63a7\u3002<\/p>\n<p><strong>6.2.3.\u7ebf\u7a0b\u4e0a\u4e0b\u6587\u5207\u6362<\/strong><\/p>\n<p>redis\u867d\u7136\u662f\u5355\u7ebf\u7a0b\u7684\uff0c\u4f46\u662f\u5728\u591a\u6838cpu\u7684\u60c5\u51b5\u4e0b\uff0c\u4e5f\u53ef\u80fd\u4f1a\u53d1\u751f\u4e0a\u4e0b\u6587\u5207\u6362\u3002\u5982\u679c\u4e3b\u7ebf\u7a0b\u4ece\u4e00\u4e2a\u7269\u7406\u6838\u5207\u6362\u5230\u4e86\u53e6\u4e00\u4e2a\u7269\u7406\u6838\uff0c\u90a3\u5c31\u4e0d\u80fd\u4f7f\u7528CPU\u9ad8\u6548\u7684\u4e00\u7ea7\u7f13\u5b58\u548c\u4e8c\u7ea7\u7f13\u5b58\u4e86\u3002\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n<\/p>\n<p>\u4e3a\u9632\u6b62\u8fd9\u79cd\u60c5\u51b5\uff0c\u53ef\u4ee5\u628aredis\u7ed1\u5b9a\u5230\u4e00\u4e2aCPU\u7269\u7406\u6838\u3002<\/p>\n<p><strong>6.2.4.\u78c1\u76d8\u6027\u80fd\u4f4e<\/strong><\/p>\n<p>\u5bf9\u4e8eAOF\u540c\u6b65\u5199\u76d8\u7684\u4f7f\u7528\u573a\u666f\uff0c\u5982\u679c\u78c1\u76d8\u6027\u80fd\u4f4e\uff0c\u4e5f\u4f1a\u5f71\u54cdredis\u7684\u54cd\u5e94\u3002\u53ef\u4ee5\u4f18\u5148\u91c7\u7528\u6027\u80fd\u66f4\u597d\u7684SSD\u786c\u76d8\u3002<\/p>\n<p><strong>7 \u8bbe\u8ba1\u6392\u884c\u699c\u529f\u80fd<\/strong><\/p>\n<p>redis\u7684zset\u7c7b\u578b\u4fdd\u5b58\u4e86\u5206\u6570\u503c\uff0c\u53ef\u4ee5\u65b9\u4fbf\u7684\u5b9e\u73b0\u6392\u884c\u699c\u7684\u529f\u80fd\u3002<\/p>\n<p>\u6bd4\u5982\u8981\u7edf\u8ba110\u7bc7\u6587\u7ae0\u7684\u6392\u884c\u699c\uff0c\u53ef\u4ee5\u5148\u5efa\u7acb\u4e00\u4e2a\u5b58\u653e10\u7bc7\u6587\u7ae0\u7684zset\uff0c\u6bcf\u5f53\u6709\u8bfb\u8005\u9605\u8bfb\u4e00\u7bc7\u6587\u7ae0\u65f6\uff0c\u5c31\u7528ZINCRBY\u547d\u4ee4\u7ed9\u8fd9\u7bc7\u6587\u7ae0\u7684\u5206\u6570\u52a01\uff0c\u6700\u540e\u53ef\u4ee5\u7528range\u547d\u4ee4\u7edf\u8ba1\u6392\u884c\u699c\u524d\u51e0\u4f4d\u7684\u6587\u7ae0\u3002<\/p>\n<p><strong>8 redis\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501<\/strong><\/p>\n<p><strong>8.1.redis\u5355\u8282\u70b9\u7684\u5206\u5e03\u5f0f\u9501<\/strong><\/p>\n<p>\u5982\u4e0b\u56fe\uff0c\u4e00\u4e2a\u670d\u52a1\u90e8\u7f72\u4e862\u4e2a\u5ba2\u6237\u7aef\uff0c\u83b7\u53d6\u5206\u5e03\u5f0f\u9501\u65f6\u4e00\u4e2a\u6210\u529f\uff0c\u53e6\u4e00\u4e2a\u5c31\u5931\u8d25\u4e86\u3002<\/p>\n<\/p>\n<p>redis\u4e00\u822c\u4f7f\u7528setnx\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\uff0c\u547d\u4ee4\u5982\u4e0b:<\/p>\n<\/p>\n<pre>SETNX&nbsp;KEY_NAME&nbsp;VALUE<\/pre>\n<\/p>\n<p>\u8bbe\u7f6e\u6210\u529f\u8fd4\u56de 1\uff0c\u8bbe\u7f6e\u5931\u8d25\u8fd4\u56de 0\u3002<\/p>\n<p>\u4f7f\u7528\u5355\u8282\u70b9\u5206\u5e03\u5f0f\u9501\u5b58\u5728\u4e00\u4e9b\u95ee\u9898\u3002<\/p>\n<p><strong>8.1.1.\u5ba2\u6237\u7aef1\u83b7\u53d6\u9501\u540e\u53d1\u751f\u4e86\u6545\u969c<\/strong><\/p>\n<p>\u7ed3\u679c\u9501\u5c31\u4e0d\u80fd\u91ca\u653e\u4e86\uff0c\u5176\u4ed6\u5ba2\u6237\u7aef\u6c38\u8fdc\u83b7\u53d6\u4e0d\u5230\u9501\u3002\u89e3\u51b3\u65b9\u6cd5\u662f\u7528\u4e0b\u9762\u547d\u4ee4\u5bf9key\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\uff1a<\/p>\n<\/p>\n<pre>SET&nbsp;key&nbsp;value&nbsp;[EX&nbsp;seconds]&nbsp;[PX&nbsp;milliseconds]&nbsp;NX<\/pre>\n<\/p>\n<p><strong>8.1.2 \u5ba2\u6237\u7aef2\u8bef\u5220\u9664\u4e86\u9501<\/strong><\/p>\n<p>\u89e3\u51b3\u65b9\u6cd5\u662f\u5bf9key\u8bbe\u7f6evalue\u65f6\u52a0\u5165\u4e00\u4e2a\u5ba2\u6237\u7aef\u8868\u793a\uff0c\u6bd4\u5982\u5728\u5ba2\u6237\u7aef1\u8bbe\u7f6ekey\u65f6\u5728value\u524d\u62fc\u63a5\u4e00\u4e2a\u5b57\u7b26\u4e32application1\uff0c\u5220\u9664\u7684\u65f6\u5019\u505a\u4e00\u4e0b\u5224\u65ad\u3002<\/p>\n<p><strong>8.2.redis\u7ea2\u9501<\/strong><\/p>\n<p>redis\u5355\u8282\u70b9\u4f1a\u6709\u53ef\u9760\u6027\u95ee\u9898\uff0c\u8282\u70b9\u6545\u969c\u540e\u9501\u64cd\u4f5c\u5c31\u4f1a\u5931\u8d25\u3002redis\u4e3a\u4e86\u5e94\u5bf9\u5355\u70b9\u6545\u969c\u7684\u95ee\u9898\uff0c\u8bbe\u8ba1\u4e86\u591a\u8282\u70b9\u7684\u5206\u5e03\u5f0f\u9501\uff0c\u4e5f\u53eb\u7ea2\u9501\u3002\u4e3b\u8981\u601d\u60f3\u662f\u5ba2\u6237\u7aef\u8ddf\u591a\u4e2aredis\u5b9e\u4f8b\u8bf7\u6c42\u52a0\u9501\uff0c\u53ea\u6709\u8d85\u8fc7\u534a\u6570\u7684\u5b9e\u4f8b\u52a0\u9501\u6210\u529f\uff0c\u624d\u8ba4\u4e3a\u6210\u529f\u83b7\u53d6\u4e86\u5206\u5e03\u5f0f\u9501\u3002<\/p>\n<p>\u5982\u4e0b\u56fe,\u5ba2\u6237\u7aef\u5206\u522b\u8ddf3\u4e2a\u5b9e\u4f8b\u8bf7\u6c42\u52a0\u9501\uff0c\u67092\u4e2a\u5b9e\u4f8b\u52a0\u9501\u6210\u529f\uff0c\u6240\u4ee5\u83b7\u53d6\u5206\u5e03\u5f0f\u9501\u6210\u529f:<\/p>\n<\/p>\n<p><strong>9 \u7f13\u5b58\u96ea\u5d29\u3001\u51fb\u7a7f\u3001\u7a7f\u900f<\/strong><\/p>\n<p><strong>9.1.\u7f13\u5b58\u96ea\u5d29<\/strong><\/p>\n<p>redis\u505a\u7f13\u5b58\u65f6\uff0c\u5982\u679c\u540c\u4e00\u65f6\u95f4\u5927\u91cf\u7f13\u5b58\u6570\u636e\u5931\u6548\uff0c\u5ba2\u6237\u7aef\u8bf7\u6c42\u4f1a\u5927\u91cf\u53d1\u9001\u5230\u6570\u636e\u5e93\uff0c\u5bfc\u81f4\u6570\u636e\u5e93\u538b\u529b\u6fc0\u589e\u3002\u5982\u4e0b\u56fe\uff1a<\/p>\n<\/p>\n<p><strong>\u300c\u5e94\u5bf9\u65b9\u6cd5\u4e3b\u8981\u67093\u4e2a\uff1a\u300d<\/strong><\/p>\n<ul>\n<li>\n<p>\u7ed9key\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\u65f6\u52a0\u4e00\u4e2a\u5c0f\u7684\u968f\u673a\u6570<\/p>\n<\/li>\n<li>\n<p>\u9650\u6d41<\/p>\n<\/li>\n<li>\n<p>\u670d\u52a1\u964d\u7ea7<\/p>\n<\/li>\n<\/ul>\n<p><strong>9.2.\u7f13\u5b58\u51fb\u7a7f<\/strong><\/p>\n<p>\u67d0\u4e2a\u70ed\u70b9key\uff0c\u7a81\u7136\u8fc7\u671f\u4e86\uff0c\u5927\u91cf\u8bf7\u6c42\u53d1\u9001\u5230\u4e86\u6570\u636e\u5e93\u3002\u89e3\u51b3\u65b9\u6848\u662f\u7ed9\u70ed\u70b9key\u4e0d\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\u3002<\/p>\n<p><strong>9.3.\u7f13\u5b58\u7a7f\u900f<\/strong><\/p>\n<p>\u67d0\u4e2a\u70ed\u70b9key\uff0c\u67e5\u8be2\u7f13\u5b58\u548c\u67e5\u8be2\u6570\u636e\u5e93\u90fd\u6ca1\u6709\uff0c\u5c31\u53d1\u751f\u4e86\u7f13\u5b58\u7a7f\u900f\u3002\u5982\u4e0b\u56fe:<\/p>\n<\/p>\n<p>\u300c\u5e94\u5bf9\u65b9\u6cd5\u4e3b\u8981\u67092\u4e2a\uff1a\u300d<\/p>\n<ul>\n<li>\n<p>\u7f13\u5b58\u70ed\u70b9\u7684\u7a7a\u503c\u548c\u7f3a\u7701\u503c<\/p>\n<\/li>\n<li>\n<p>\u67e5\u8be2\u6570\u636e\u5e93\u4e4b\u524d\u5148\u67e5\u8be2\u5e03\u9686\u8fc7\u6ee4\u5668<\/p>\n<\/li>\n<\/ul>\n<p><strong>10 \u6570\u636e\u503e\u659c<\/strong><\/p>\n<p>\u4ec0\u4e48\u662f\u6570\u636e\u503e\u659c?\u770b\u4e0b\u9762\u8fd9\u4e2a\u9762\u8bd5\u9898\uff1a<\/p>\n<p>\u5982\u679credis\u6709\u4e00\u4e2a\u70ed\u70b9key\uff0cqps\u80fd\u8fbe\u5230100w\uff0c\u8be5\u5982\u4f55\u5b58\u50a8?<\/p>\n<p>\u5982\u679c\u8fd9\u4e2a\u70ed\u70b9key\u88ab\u653e\u5230\u4e00\u4e2aredis\u5b9e\u4f8b\u4e0a\uff0c\u8fd9\u4e2a\u5b9e\u4f8b\u9762\u4e34\u7684\u8bbf\u95ee\u538b\u529b\u4f1a\u975e\u5e38\u5927\u3002\u5982\u4e0b\u56fe\uff0credis3\u8fd9\u4e2a\u5b9e\u4f8b\u4fdd\u5b58\u4e86foo\u8fd9\u4e2a\u70ed\u70b9key\uff0c\u8bbf\u95ee\u538b\u529b\u4f1a\u5f88\u5927\uff1a<\/p>\n<\/p>\n<p>\u300c\u89e3\u51b3\u65b9\u6cd5\u4e3b\u8981\u6709\u4e24\u4e2a\uff1a\u300d<\/p>\n<p>1.\u4f7f\u7528\u5ba2\u6237\u7aef\u672c\u5730\u7f13\u5b58\u6765\u7f13\u5b58key\uff0c\u8fd9\u6837\u6539\u9020\u4f1a\u6709\u4e24\u4e2a\u95ee\u9898\uff1a<\/p>\n<ul>\n<li>\n<p>\u5ba2\u6237\u7aef\u7f13\u5b58\u7684\u70ed\u70b9key\u53ef\u80fd\u6d88\u8017\u5927\u91cf\u5185\u5b58<\/p>\n<\/li>\n<\/ul>\n<p>\u5ba2\u6237\u7aef\u9700\u8981\u4fdd\u8bc1\u672c\u5730\u7f13\u5b58\u548credis\u7f13\u5b58\u7684\u4e00\u81f4\u6027<\/p>\n<p>2.\u7ed9\u70ed\u70b9key\u52a0\u4e00\u4e2a\u968f\u673a\u524d\u7f00\uff0c\u8ba9\u5b83\u4fdd\u5b58\u5230\u4e0d\u540c\u7684redis\u5b9e\u4f8b\u4e0a\uff0c\u8fd9\u6837\u4e5f\u4f1a\u5b58\u5728\u4e24\u4e2a\u95ee\u9898\uff1a<\/p>\n<ul>\n<li>\n<p>\u5ba2\u6237\u7aef\u5728\u8bbf\u95ee\u7684\u65f6\u5019\u9700\u8981\u7ed9\u8fd9\u4e2akey\u52a0\u524d\u7f00<\/p>\n<\/li>\n<li>\n<p>\u5ba2\u6237\u7aef\u5728\u5220\u9664\u7684\u65f6\u5019\u9700\u8981\u6839\u636e\u6240\u6709\u524d\u7f00\u6765\u5220\u9664\u4e0d\u540c\u5b9e\u4f8b\u4e0a\u4fdd\u5b58\u7684\u8fd9\u4e2akey<\/p>\n<\/li>\n<\/ul>\n<p><strong>11 bitmap\u4f7f\u7528<\/strong><\/p>\n<p>\u6709\u4e00\u9053\u7ecf\u5178\u7684\u9762\u8bd5\u9898\uff0c10\u4ebf\u6574\u6570\u600e\u4e48\u5728\u5185\u5b58\u4e2d\u53bb\u91cd\u6392\u5e8f?<\/p>\n<p>\u6211\u4eec\u5148\u7b97\u4e00\u4e0b10\u4ebf\u6574\u6570\u5360\u7684\u5185\u5b58\uff0cjava\u4e00\u4e2a\u6574\u6570\u7c7b\u578b\u5360\u56db\u5b57\u8282\uff0c\u5360\u7528\u5185\u5b58\u5927\u5c0f\u7ea6<\/p>\n<\/p>\n<pre>10\u4ebf&nbsp;*&nbsp;4&nbsp;\/&nbsp;1024&nbsp;\/&nbsp;1024&nbsp;=&nbsp;3.7G<\/pre>\n<\/p>\n<p>\u5360\u5f97\u5185\u5b58\u592a\u5927\u4e86\uff0c\u5982\u679c\u5185\u5b58\u4e0d\u591f\uff0c\u600e\u4e48\u529e\u5462?<\/p>\n<p><strong>11.1.bitmap\u4ecb\u7ecd<\/strong><\/p>\n<p>bitmap\u7c7b\u578b\u4f7f\u7528\u7684\u6570\u636e\u7ed3\u6784\u662fString\uff0c\u5e95\u5c42\u5b58\u50a8\u683c\u5f0f\u662f\u4e8c\u8fdb\u5236\u7684bit\u6570\u7ec4\u3002\u5047\u5982\u6211\u4eec\u67091\u30014\u30016\u30019\u56db\u4e2a\u6570\uff0c\u4fdd\u5b58\u5728bit\u6570\u7ec4\u4e2d\u5982\u4e0b\u56fe\uff1a<\/p>\n<\/p>\n<p>\u5728\u8fd9\u4e2abit\u6570\u7ec4\u4e2d\u752810\u4e2abit\u7684\u7a7a\u95f4\u4fdd\u5b58\u4e86\u56db\u4e2a\u6574\u6570\uff0c\u5360\u7528\u7a7a\u95f4\u975e\u5e38\u5c0f\u3002<\/p>\n<p>\u518d\u56de\u5230\u9762\u8bd5\u9898\uff0c\u6211\u4eec\u4f7f\u7528bit\u6570\u7ec4\u957f\u5ea6\u662f10\u4ebf\u6574\u6570\u4e2d \u300c(\u6700\u5927\u503c &#8211; \u6700\u5c0f\u503c + 1)\u300d\u3002<\/p>\n<p>\u5982\u679c\u6709\u8d1f\u6570\uff0c\u9700\u8981\u8fdb\u884c\u4e00\u4e2a\u8f6c\u5316\uff0c\u6240\u6709\u6570\u5b57\u52a0\u6700\u5c0f\u8d1f\u6570\u7684\u7edd\u5bf9\u503c\u3002\u6bd4\u5982{-2, 0, 1, 3},\u6211\u4eec\u8f6c\u6362\u6210{0, 2, 3, &nbsp;5}\uff0c\u56e0\u4e3a\u6570\u7ec4\u4e0b\u6807\u5fc5\u987b\u4ece0\u5f00\u59cb<\/p>\n<p><strong>11.2.\u4f7f\u7528\u573a\u666f<\/strong><\/p>\n<p><strong>11.2.1.\u5458\u5de5\u6253\u5361\u8bb0\u5f55<\/strong><\/p>\n<p>\u5728\u4e00\u4e2a\u6709100\u4e2a\u5458\u5de5\u7684\u516c\u53f8\uff0c\u8981\u7edf\u8ba1\u4e00\u4e2a\u6708\u5185\u5458\u5de5\u5168\u52e4\u7684\u4eba\u6570\uff0c\u53ef\u4ee5\u6bcf\u5929\u521b\u5efa\u4e00\u4e2abitmap\uff0c\u7b7e\u5230\u7684\u5458\u5de5bit\u4f4d\u7f6e\u4e3a1\u3002<\/p>\n<p>\u8981\u7edf\u8ba1\u5f53\u5929\u7b7e\u5230\u7684\u5458\u5de5\u53ea\u8981\u7528BITCOUNT\u547d\u4ee4\u5c31\u53ef\u4ee5\u3002<\/p>\n<p>\u8981\u7edf\u8ba1\u5f53\u6708\u5168\u52e4\u7684\u5458\u5de5\uff0c\u53ea\u8981\u5bf9\u5f53\u6708\u6bcf\u5929\u7684bitmap\u505a\u4ea4\u96c6\u8fd0\u7b97\u5c31\u53ef\u4ee5\uff0c\u547d\u4ee4\u5982\u4e0b\uff1a<\/p>\n<\/p>\n<pre>BITOP&nbsp;AND&nbsp;srckey1&nbsp;srckey2&nbsp;srckey3&nbsp;...&nbsp;srckey30<\/pre>\n<\/p>\n<p>srckeyN\u8868\u793a\u7b2cN\u5929\u7684\u6253\u5361\u8bb0\u5f55bitmap<\/p>\n<p><strong>11.2.2.\u7edf\u8ba1\u7f51\u7ad9\u65e5\u6d3b\u8dc3\u7528\u6237<\/strong><\/p>\n<p>\u6bd4\u5982\u7f51\u7ad9\u670910\u4e07\u4e2a\u7528\u6237\uff0c\u8fd9\u6837\u6211\u4eec\u521b\u5efa\u4e00\u4e2a\u957f\u5ea6\u4e3a10\u4e07\u7684bitmap\uff0c\u6bcf\u4e2a\u7528\u6237id\u5360\u4e00\u4e2a\u4f4d\uff0c\u5982\u679c\u7528\u6237\u767b\u5f55\uff0c\u5c31\u628abit\u4f4d\u7f6e\u4e3a1\uff0c\u65e5\u7ec8\u7684\u65f6\u5019\u7528BITCOUNT\u547d\u4ee4\u7edf\u8ba1\u51fa\u5f53\u5929\u767b\u5f55\u8fc7\u7684\u7528\u6237\u603b\u6570\u3002<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Redis\u9762\u8bd5\uff1a19\u56fe+11\u9898\u5e2e&#46;&#46;&#46;<\/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-201504","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201504","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=201504"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201504\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=201504"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=201504"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=201504"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}