{"id":4507,"date":"2019-10-06T12:06:53","date_gmt":"2019-10-06T04:06:53","guid":{"rendered":"https:\/\/www.xttblog.com\/?p=4507"},"modified":"2020-02-01T11:44:50","modified_gmt":"2020-02-01T03:44:50","slug":"redis-%e7%9a%84-key-%e6%98%af%e5%a6%82%e4%bd%95%e5%af%bb%e5%9d%80%e7%9a%84%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=4507","title":{"rendered":"Redis \u7684 Key \u662f\u5982\u4f55\u5bfb\u5740\u7684\uff1f"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u5927\u5bb6\u90fd\u77e5\u9053 Redis \u5f88\u5feb\uff0c\u7528\u7684\u516c\u53f8\u4e5f\u975e\u5e38\u591a\u3002\u56e0\u6b64\uff0c\u9762\u8bd5\u4e2d\u9047\u5230 Redis \u51e0\u4e4e\u662f 100%\u3002\u8fd9\u4e24\u5929\uff0c\u6709\u7f51\u53cb\u7ed9\u6211\u7559\u8a00\uff0c\u9762\u8bd5\u4e2d\u88ab\u95ee\u5230\u201cRedis \u7684 Key \u662f\u5982\u4f55\u5bfb\u5740\u7684\uff1f\u201d\u5173\u4e8e\u8fd9\u4e2a\u95ee\u9898\uff0c\u4eca\u5929\u6211\u4eec\u6765\u7b80\u5355\u7684\u89e3\u7b54\u4e00\u4e0b\uff01<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Redis \u670d\u52a1\u5668\u5728\u521d\u59cb\u5316\u65f6\uff0c\u9ed8\u8ba4\u7684\u4f1a\u9884\u5148\u5206\u914d 16 \u4e2a\u6570\u636e\u5e93\u3002\u8fd9\u5176\u4e2d\u7684\u6bcf\u4e00\u4e2a\u6570\u636e\u5e93\uff0c\u90fd\u7531\u4e00\u4e2a redisDb \u7684\u7ed3\u6784\u5b58\u50a8\u3002redisDb \u7684\u7ed3\u6784\u4e2d\u6709\u4e24\u4e2a\u91cd\u8981\u7684\u90e8\u5206\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>redisDb.id\uff1a\u5b58\u50a8\u7740 redis \u6570\u636e\u5e93\u4ee5\u6574\u6570\u8868\u793a\u7684\u53f7\u7801\u3002<\/li><li>redisDb.dict\uff1a\u5b58\u50a8\u7740\u8be5\u5e93\u6240\u6709\u7684\u952e\u503c\u5bf9\u6570\u636e\u3002<\/li><li>redisDb.expires\uff1a\u4fdd\u5b58\u7740\u6bcf\u4e00\u4e2a\u952e\u7684\u8fc7\u671f\u65f6\u95f4\u3002<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u9488\u5bf9 Redis \u4e2d\u7684\u4f17\u591a\u6570\u636e\u5e93\uff0c\u5f53\u6211\u4eec\u4f7f\u7528 select number \u9009\u62e9\u6570\u636e\u5e93\u65f6\uff0c\u7a0b\u5e8f\u53ef\u4ee5\u76f4\u63a5\u901a\u8fc7 redisServer.db[number] \u6765\u5207\u6362\u6570\u636e\u5e93\u3002\u6709\u65f6\u5019\u5f53\u7a0b\u5e8f\u9700\u8981\u77e5\u9053\u81ea\u5df1\u662f\u5728\u54ea\u4e2a\u6570\u636e\u5e93\u65f6\uff0c\u4e5f\u53ef\u4ee5\u76f4\u63a5\u901a\u8fc7\u8bfb\u53d6 redisDb.id \u5373\u53ef\u3002 <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Redis \u7684\u5b57\u5178\u4f7f\u7528\u54c8\u5e0c\u8868\u4f5c\u4e3a\u5176\u5e95\u5c42\u5b9e\u73b0\u3002dict \u7c7b\u578b\u4f7f\u7528\u7684\u4e24\u4e2a\u6307\u5411\u54c8\u5e0c\u8868\u7684\u6307\u9488\uff0c\u5176\u4e2d 0 \u53f7\u54c8\u5e0c\u8868\uff08ht[0]\uff09\u4e3b\u8981\u7528\u4e8e\u5b58\u50a8\u6570\u636e\u5e93\u7684\u6240\u6709\u952e\u503c\uff0c\u800c 1 \u53f7\u54c8\u5e0c\u8868\u4e3b\u8981\u7528\u4e8e\u7a0b\u5e8f\u5bf9 0 \u53f7\u54c8\u5e0c\u8868\u8fdb\u884c rehash \u65f6\u4f7f\u7528\uff0crehash \u4e00\u822c\u662f\u5728\u6dfb\u52a0\u65b0\u503c\u65f6\u4f1a\u89e6\u53d1\uff0c\u8fd9\u91cc\u4e0d\u505a\u8fc7\u591a\u7684\u8d58\u8ff0\u3002\u6240\u4ee5 redis \u4e2d\u67e5\u627e\u4e00\u4e2a key\uff0c\u5176\u5b9e\u5c31\u662f\u5bf9\u8fdb\u884c\u8be5 dict \u7ed3\u6784\u4e2d\u7684 ht[0] \u8fdb\u884c\u67e5\u627e\u64cd\u4f5c\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u65e2\u7136\u662f\u54c8\u5e0c\uff0c\u90a3\u4e48\u6211\u4eec\u77e5\u9053\u5c31\u4f1a\u6709\u54c8\u5e0c\u78b0\u649e\uff0c\u90a3\u4e48\u5f53\u591a\u4e2a\u952e\u54c8\u5e0c\u4e4b\u540e\u4e3a\u540c\u4e00\u4e2a\u503c\u600e\u4e48\u529e\u5462\uff1fredis \u91c7\u53d6\u94fe\u8868\u7684\u65b9\u5f0f\u6765\u5b58\u50a8\u591a\u4e2a\u54c8\u5e0c\u78b0\u649e\u7684\u952e\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5f53\u6839\u636e key \u7684\u54c8\u5e0c\u503c\u627e\u5230\u8be5\u5217\u8868\u540e\uff0c\u5982\u679c\u5217\u8868\u7684\u957f\u5ea6\u5927\u4e8e 1\uff0c\u90a3\u4e48\u6211\u4eec\u9700\u8981\u904d\u5386\u8be5\u94fe\u8868\u6765\u627e\u5230\u6211\u4eec\u6240\u67e5\u627e\u7684 key\u3002\u5f53\u7136\uff0c\u4e00\u822c\u60c5\u51b5\u4e0b\u94fe\u8868\u957f\u5ea6\u90fd\u4e3a\u662f 1\uff0c\u6240\u4ee5\u65f6\u95f4\u590d\u6742\u5ea6\u53ef\u770b\u4f5c o(1)\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6839\u636e\u4e0a\u9762\u7684\u89e3\u91ca\uff0c\u4ee5\u53ca\u5b98\u65b9\u6587\u6863\u548c\u6e90\u7801\u89e3\u6bd2\u3002\u6211\u4eec\u53ef\u4ee5\u5f97\u51fa\uff0cRedis \u7684 Key \u5bfb\u5740\u5305\u542b\u4e00\u4e0b\u6b65\u9aa4\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>\u5f53\u62ff\u5230\u4e00\u4e2a key \u540e\uff0credis \u5148\u5224\u65ad\u5f53\u524d\u5e93\u7684 0 \u53f7\u54c8\u5e0c\u8868\u662f\u5426\u4e3a\u7a7a\uff0c\u5373\uff1aif (dict-&gt;ht[0].size == 0)\u3002\u5982\u679c\u4e3a true \u76f4\u63a5\u8fd4\u56de NULL\u3002<\/li><li>\u5224\u65ad\u8be5 0 \u53f7\u54c8\u5e0c\u8868\u662f\u5426\u9700\u8981 rehash\uff0c\u56e0\u4e3a\u5982\u679c\u5728\u8fdb\u884c rehash\uff0c\u90a3\u4e48\u4e24\u4e2a\u8868\u4e2d\u90fd\u6709\u53ef\u80fd\u5b58\u50a8\u8be5 key\u3002\u5982\u679c\u6b63\u5728\u8fdb\u884c rehash\uff0c\u5c06\u8c03\u7528\u4e00\u6b21_dictRehashStep \u65b9\u6cd5\uff0c_dictRehashStep \u7528\u4e8e\u5bf9\u6570\u636e\u5e93\u5b57\u5178\u3001\u4ee5\u53ca\u54c8\u5e0c\u952e\u7684\u5b57\u5178\u8fdb\u884c\u88ab\u52a8 rehash\u3002<\/li><li>\u8ba1\u7b97\u54c8\u5e0c\u8868\uff0c\u6839\u636e\u5f53\u524d\u5b57\u5178\u4e0e key \u8fdb\u884c\u54c8\u5e0c\u503c\u7684\u8ba1\u7b97\u3002<\/li><li>\u6839\u636e\u54c8\u5e0c\u503c\u4e0e\u5f53\u524d\u5b57\u5178\u8ba1\u7b97\u54c8\u5e0c\u8868\u7684\u7d22\u5f15\u503c\u3002<\/li><li>\u6839\u636e\u7d22\u5f15\u503c\u5728\u54c8\u5e0c\u8868\u4e2d\u53d6\u51fa\u94fe\u8868\uff0c\u904d\u5386\u8be5\u94fe\u8868\u627e\u5230 key \u7684\u4f4d\u7f6e\u3002\u4e00\u822c\u60c5\u51b5\uff0c\u8be5\u94fe\u8868\u957f\u5ea6\u4e3a 1\u3002<\/li><li>\u5f53 ht[0] \u67e5\u627e\u5b8c\u4e86\u4e4b\u540e\uff0c\u518d\u8fdb\u884c\u4e86\u6b21 rehash \u5224\u65ad\uff0c\u5982\u679c\u672a\u5728 rehashing\uff0c\u5219\u76f4\u63a5\u7ed3\u675f\uff0c\u5426\u5219\u5bf9 ht[1]\u91cd\u590d 345 \u6b65\u9aa4\u3002<\/li><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u662f Redis \u96c6\u7fa4\u6a21\u5f0f\uff0c\u5219\u9700\u8981\u5148\u5224\u65ad key \u5728\u54ea\u4e00\u4e2a\u8282\u70b9\u4e0a\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/img-bbs.csdn.net\/upload\/201910\/06\/1570334663_378058.jpg\" alt=\"\" \/><figcaption>Redis \u7684 key \u5bfb\u5740<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ee5\u4e0a\uff0c\u53ea\u662f\u6211\u4e2a\u4eba\u7684\u7247\u9762\u7406\u89e3\uff0c\u5982\u6709\u9519\u8bef\uff0c\u8bf7\u5927\u5bb6\u5e2e\u6211\u6307\u6b63\u3002\u53e6\u5916\uff0c\u61c2 C \u7684\uff0c\u53ef\u4ee5\u8dd1\u4e00\u904d Redis \u7684\u6e90\u7801\u3002\u5206\u4eab\u51fa\u76f8\u5173\u7684\u5bfb\u5740\u6b65\u9aa4\uff0c\u6211\u4eec\u4e00\u8d77\u7cbe\u8fdb\uff01<\/p>\n<!-- <audio autoplay=\"autoplay\" height=\"100\" width=\"100\" hidden=\"true\"><source src=\"https:\/\/c.coka.la\/orAvPR.mp3\" type=\"audio\/mp3\"\/><\/audio><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/ws3.sinaimg.cn\/large\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/> --><p><!-- <img decoding=\"async\" src=\"https:\/\/raw.githubusercontent.com\/xmt1139057136\/xttblog\/master\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/>--><img decoding=\"async\" src=\"https:\/\/saas.51autoparts.cn\/api\/admin\/sys-file\/oss\/file?fileName=84db51f8561e448f9a4fda2eff0811f9.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/><\/p><p>\u6700\u540e\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u4e2a\u4eba\u5fae\u4fe1\u516c\u4f17\u53f7\uff1a\u4e1a\u4f59\u8349\uff08yyucao\uff09\uff01<b>\u53ef\u52a0\u4f5c\u8005\u5fae\u4fe1\u53f7\uff1a<font color=\"red\">xttblog2<\/font>\u3002\u5907\u6ce8\uff1a\u201c1\u201d\uff0c\u6dfb\u52a0\u535a\u4e3b\u5fae\u4fe1\u62c9\u4f60\u8fdb\u5fae\u4fe1\u7fa4\u3002\u5907\u6ce8\u9519\u8bef\u4e0d\u4f1a\u540c\u610f\u597d\u53cb\u7533\u8bf7\u3002<\/b>\u518d\u6b21\u611f\u8c22\u60a8\u7684\u5173\u6ce8\uff01\u540e\u7eed\u6709\u7cbe\u5f69\u5185\u5bb9\u4f1a\u7b2c\u4e00\u65f6\u95f4\u53d1\u7ed9\u60a8\uff01\u539f\u521b\u6587\u7ae0\u6295\u7a3f\u8bf7\u53d1\u9001\u81f3532009913@qq.com\u90ae\u7bb1\u3002\u5546\u52a1\u5408\u4f5c\u4e5f\u53ef\u6dfb\u52a0\u4f5c\u8005\u5fae\u4fe1\u8fdb\u884c\u8054\u7cfb\uff01<\/p><p>\u672c\u6587\u539f\u6587\u51fa\u5904\uff1a<a href=\"https:\/\/www.xttblog.com\">\u4e1a\u4f59\u8349<\/a>\uff1a &raquo; <a href=\"https:\/\/www.xttblog.com\/?p=4507\">Redis \u7684 Key \u662f\u5982\u4f55\u5bfb\u5740\u7684\uff1f<\/a><\/p><!-- <div class=\"bd-reward-stl\"><button id=\"bdRewardBtn\"><span><\/span><\/button><\/div> -->","protected":false},"excerpt":{"rendered":"<p>\u5927\u5bb6\u90fd\u77e5\u9053 Redis \u5f88\u5feb\uff0c\u7528\u7684\u516c\u53f8\u4e5f\u975e\u5e38\u591a\u3002\u56e0\u6b64\uff0c\u9762\u8bd5\u4e2d\u9047\u5230 Redis \u51e0\u4e4e\u662f 100%\u3002\u8fd9\u4e24\u5929\uff0c\u6709\u7f51\u53cb [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[669,672,1876,1879,1877],"class_list":["post-4507","post","type-post","status-publish","format-standard","hentry","category-java","tag-redis","tag-redis-cluster","tag-redis-hgetall-","tag-redis-hgetall"],"_links":{"self":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4507","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4507"}],"version-history":[{"count":2,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4507\/revisions"}],"predecessor-version":[{"id":4699,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4507\/revisions\/4699"}],"wp:attachment":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4507"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4507"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4507"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}