{"id":152529,"date":"2024-11-01T23:52:21","date_gmt":"2024-11-01T15:52:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/152529\/"},"modified":"2024-11-01T23:52:22","modified_gmt":"2024-11-01T15:52:22","slug":"%e6%9f%a5%e7%9c%8b-redis-%e9%8d%b5%e7%9a%84%e6%95%b8%e9%87%8f%ef%bc%88redis-%e6%9f%a5%e7%9c%8b%e6%9c%89%e5%a4%9a%e5%b0%91%e5%80%8b%e9%8d%b5%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/152529\/","title":{"rendered":"\u67e5\u770b Redis \u9375\u7684\u6578\u91cf\uff08Redis \u67e5\u770b\u6709\u591a\u5c11\u500b\u9375\uff09"},"content":{"rendered":"

\u67e5\u770b Redis \u9375\u7684\u6578\u91cf\uff08Redis \u67e5\u770b\u6709\u591a\u5c11\u500b\u9375\uff09<\/h1>\n

Redis \u662f\u4e00\u500b\u9ad8\u6548\u80fd\u7684\u9375\u503c\u5b58\u5132\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u6578\u64da\u7de9\u5b58\u3001\u6d88\u606f\u968a\u5217\u548c\u5be6\u6642\u6578\u64da\u8655\u7406\u7b49\u5834\u666f\u3002\u4f5c\u70ba\u4e00\u500b\u958b\u767c\u8005\u6216\u7cfb\u7d71\u7ba1\u7406\u54e1\uff0c\u4e86\u89e3\u5982\u4f55\u67e5\u770b Redis \u4e2d\u7684\u9375\u7684\u6578\u91cf\u662f\u975e\u5e38\u91cd\u8981\u7684\uff0c\u9019\u4e0d\u50c5\u6709\u52a9\u65bc\u76e3\u63a7\u6578\u64da\u7684\u4f7f\u7528\u60c5\u6cc1\uff0c\u9084\u80fd\u5e6b\u52a9\u512a\u5316\u7cfb\u7d71\u6027\u80fd\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5e7e\u7a2e\u67e5\u770b Redis \u9375\u7684\u6578\u91cf\u7684\u65b9\u6cd5\u3002<\/p>\n

\u4f7f\u7528 Redis \u547d\u4ee4\u884c\u5de5\u5177<\/h2>\n

Redis \u63d0\u4f9b\u4e86\u4e00\u500b\u547d\u4ee4\u884c\u5de5\u5177\uff0c\u7a31\u70ba redis-cli<\/code>\uff0c\u53ef\u4ee5\u7528\u4f86\u8207 Redis \u4f3a\u670d\u5668\u9032\u884c\u4ea4\u4e92\u3002\u8981\u67e5\u770b Redis \u4e2d\u7684\u9375\u7684\u6578\u91cf\uff0c\u53ef\u4ee5\u4f7f\u7528 dbsize<\/code> \u547d\u4ee4\u3002\u9019\u500b\u547d\u4ee4\u6703\u8fd4\u56de\u7576\u524d\u6578\u64da\u5eab\u4e2d\u9375\u7684\u7e3d\u6578\u3002<\/p>\n

redis-cli\n127.0.0.1:6379> DBSIZE\n(integer) 42\n<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u8fd4\u56de\u7684\u6578\u5b57 42 \u8868\u793a\u7576\u524d\u6578\u64da\u5eab\u4e2d\u6709 42 \u500b\u9375\u3002<\/p>\n
\u4f7f\u7528 SCAN \u547d\u4ee4<\/h2>\n
\u5982\u679c\u60a8\u9700\u8981\u67e5\u770b\u7279\u5b9a\u6a21\u5f0f\u7684\u9375\u7684\u6578\u91cf\uff0c\u53ef\u4ee5\u4f7f\u7528 SCAN<\/code> \u547d\u4ee4\u3002\u9019\u500b\u547d\u4ee4\u53ef\u4ee5\u7528\u4f86\u904d\u6b77 Redis \u4e2d\u7684\u9375\uff0c\u800c\u4e0d\u6703\u963b\u585e\u4f3a\u670d\u5668\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u4f7f\u7528 SCAN<\/code> \u547d\u4ee4\u4f86\u8a08\u7b97\u7279\u5b9a\u6a21\u5f0f\u7684\u9375\u7684\u6578\u91cf\uff1a<\/p>\n
redis-cli\n127.0.0.1:6379> SCAN 0 MATCH mykey:* COUNT 100\n<\/code><\/pre>\n
\u9019\u88e1\uff0cmykey:*<\/code> \u662f\u6211\u5011\u8981\u5339\u914d\u7684\u9375\u7684\u6a21\u5f0f\u3002COUNT<\/code> \u53c3\u6578\u6307\u5b9a\u6bcf\u6b21\u8fd4\u56de\u7684\u9375\u7684\u6578\u91cf\u3002\u9019\u500b\u547d\u4ee4\u6703\u8fd4\u56de\u4e00\u500b\u6e38\u6a19\u548c\u5339\u914d\u7684\u9375\uff0c\u60a8\u53ef\u4ee5\u91cd\u8907\u8abf\u7528 SCAN<\/code> \u76f4\u5230\u6e38\u6a19\u8fd4\u56de 0 \u70ba\u6b62\uff0c\u9019\u6a23\u5c31\u53ef\u4ee5\u7372\u5f97\u6240\u6709\u5339\u914d\u7684\u9375\u3002<\/p>\n
\u4f7f\u7528 Lua \u8173\u672c<\/h2>\n
\u5982\u679c\u60a8\u9700\u8981\u66f4\u9748\u6d3b\u7684\u65b9\u5f0f\u4f86\u8a08\u7b97\u9375\u7684\u6578\u91cf\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528 Lua \u8173\u672c\u3002Redis \u652f\u6301\u5728\u4f3a\u670d\u5668\u7aef\u57f7\u884c Lua \u8173\u672c\uff0c\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u7db2\u7d61\u5ef6\u9072\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684 Lua \u8173\u672c\u793a\u4f8b\uff0c\u7528\u65bc\u8a08\u7b97\u7279\u5b9a\u6a21\u5f0f\u7684\u9375\u7684\u6578\u91cf\uff1a<\/p>\n
local count = 0\nlocal cursor = \"0\"\nrepeat\n    local result = redis.call(\"SCAN\", cursor, \"MATCH\", \"mykey:*\", \"COUNT\", 100)\n    cursor = result[1]\n    count = count + #result[2]\nuntil cursor == \"0\"\nreturn count\n<\/code><\/pre>\n
\u9019\u6bb5\u8173\u672c\u6703\u8fd4\u56de\u5339\u914d\u6a21\u5f0f\u7684\u9375\u7684\u7e3d\u6578\u3002\u60a8\u53ef\u4ee5\u901a\u904e EVAL<\/code> \u547d\u4ee4\u4f86\u57f7\u884c\u9019\u500b\u8173\u672c\uff1a<\/p>\n
redis-cli\n127.0.0.1:6379> EVAL \"local count = 0 ... return count\" 0\n<\/code><\/pre>\n
\u7e3d\u7d50<\/h2>\n
\u4e86\u89e3\u5982\u4f55\u67e5\u770b Redis \u4e2d\u7684\u9375\u7684\u6578\u91cf\u5c0d\u65bc\u7ba1\u7406\u548c\u512a\u5316\u6578\u64da\u5eab\u81f3\u95dc\u91cd\u8981\u3002\u7121\u8ad6\u662f\u4f7f\u7528 DBSIZE<\/code> \u547d\u4ee4\u3001SCAN<\/code> \u547d\u4ee4\uff0c\u9084\u662f\u901a\u904e Lua \u8173\u672c\uff0c\u9019\u4e9b\u65b9\u6cd5\u90fd\u80fd\u5e6b\u52a9\u60a8\u6709\u6548\u5730\u7372\u53d6\u6240\u9700\u7684\u4fe1\u606f\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u80fd\u548c\u7a69\u5b9a\u6027\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4e5f\u662f\u4e00\u500b\u91cd\u8981\u7684\u8003\u91cf\uff0c\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u60a8\u7684 Redis \u4f3a\u670d\u5668\u5728\u9ad8\u8ca0\u8f09\u4e0b\u4f9d\u7136\u80fd\u5920\u7a69\u5b9a\u904b\u884c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3\u5982\u4f55\u5728 Redis \u4e2d\u67e5\u770b\u9375\u7684\u6578\u91cf\uff0c\u8f15\u9b06\u7ba1\u7406\u6578\u64da\u5eab\u4e2d\u7684\u9375\uff0c\u63d0\u5347\u6027\u80fd\u8207\u6548\u7387\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-152529","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152529","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"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=152529"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152529\/revisions"}],"predecessor-version":[{"id":152530,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152529\/revisions\/152530"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=152529"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=152529"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=152529"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}