{"id":675,"date":"2021-01-13T14:55:38","date_gmt":"2021-01-13T06:55:38","guid":{"rendered":"http:\/\/blog.refusea.com\/?p=675"},"modified":"2021-01-13T14:59:53","modified_gmt":"2021-01-13T06:59:53","slug":"redis-%e6%95%b0%e6%8d%ae%e7%bb%93%e6%9e%84%e5%92%8c%e5%86%85%e5%ad%98%e6%b6%88%e8%80%97","status":"publish","type":"post","link":"https:\/\/refusea.com\/?p=675","title":{"rendered":"redis \u6570\u636e\u7ed3\u6784\u548c\u5185\u5b58\u6d88\u8017"},"content":{"rendered":"

\u5728\u4e0a\u4e00\u7bc7\u5206\u4eab redis \u5185\u5b58\u5360\u7528\u4f18\u5316\u5b9e\u4f8b<\/a> \u91cc\uff0c\u4f7f\u7528\u4e86\u591a\u79cd\u6570\u636e\u7ed3\u6784\u6765\u5b9e\u73b0\u540c\u4e00\u4e2a\u4e1a\u52a1\u9700\u6c42\uff0c\u540c\u65f6\u8fd8\u6709\u4e00\u4e2a\u5173\u4e8e\u8282\u7701\u5185\u5b58\u7684\u5efa\u8bae<\/p>\n

\n

\u5982\u679c value \u7684\u503c\u6ca1\u6709\u5b9e\u9645\u610f\u4e49\uff0c\u5efa\u8bae\u5b58\u4e3a 0<\/p>\n<\/blockquote>\n

\u672c\u6587\u5c31\u7814\u7a76\u4e0b\u5b9e\u73b0\u540c\u6837\u7684\u529f\u80fd\uff0c\u4e0d\u540c\u6570\u636e\u7ed3\u6784\u7684\u5185\u5b58\u7684\u6d88\u8017<\/p>\n

\u4ee5\u4e0b\u6d4b\u8bd5\u5747\u4f7f\u7528 redis 4.0 \u7248\u672c<\/p>\n

integer vs string<\/h2>\n
127.0.0.1:6379> set key1 1587018589\nOK\n127.0.0.1:6379> memory usage key1\n(integer) 48\n127.0.0.1:6379> set key2 "0"\nOK\n127.0.0.1:6379> memory usage key2\n(integer) 48\n127.0.0.1:6379> set key3 ""\nOK\n127.0.0.1:6379> memory usage key3\n(integer) 50\n127.0.0.1:6379> set key4 x\nOK\n127.0.0.1:6379> memory usage key4\n(integer) 51\n127.0.0.1:6379> set key5 xyz\nOK\n127.0.0.1:6379> memory usage key5\n(integer) 53<\/code><\/pre>\n
\u6bd4\u8f83\u610f\u5916<\/p>\n
    \n
  1. \u4fdd\u5b58\u4e00\u4e2a 10 \u4f4d\u7684\u6574\u6570\uff0c\u548c\u4fdd\u5b58 0 \u5360\u7528\u5185\u5b58\u4e00\u6837\uff0c\u5982\u679c\u8fd9\u6837\u7684\u8bdd\uff0credis \u7684\u5171\u4eab\u6574\u6570\u662f\u5982\u4f55\u8282\u7ea6\u5185\u5b58\u7684\uff1f<\/li>\n
  2. \u4fdd\u5b58\u4e00\u4e2a\u7a7a\u5b57\u7b26\u4e32\u7adf\u7136\u6bd4\u4fdd\u5b58 10 \u4f4d\u6574\u6570\u8fd8\u8981\u591a\u5360\u7528 2 \u4e2a\u5b57\u8282<\/li>\n<\/ol>\n
    redis \u5171\u4eab\u6574\u6570\u548c\u7a7a\u5b57\u7b26\u4e32<\/h2>\n
    127.0.0.1:6379> hset key1 f1 1234567890\n(integer) 1\n127.0.0.1:6379> memory usage key1\n(integer) 69\n127.0.0.1:6379> hset key1 f2 2345678901\n(integer) 1\n127.0.0.1:6379> memory usage key1\n(integer) 83\n127.0.0.1:6379> hset key1 f3 3456789012\n(integer) 1\n127.0.0.1:6379> memory usage key1\n(integer) 97\n127.0.0.1:6379> hset key2 f1 0\n(integer) 1\n127.0.0.1:6379> memory usage key2\n(integer) 65\n127.0.0.1:6379> hset key2 f2 0\n(integer) 1\n127.0.0.1:6379> memory usage key2\n(integer) 71\n127.0.0.1:6379> hset key2 f3 0\n(integer) 1\n127.0.0.1:6379> memory usage key2\n(integer) 77<\/code><\/pre>\n
    \u8fd9\u91cc\u53ef\u4ee5\u770b\u51fa\u5dee\u5f02\u4e86\uff0c\u5f53\u503c\u4e3a 10 \u4f4d\u6574\u6570\u65f6\uff0c\u6bcf\u591a\u4e00\u4e2a\u5b57\u6bb5\uff0c\u5185\u5b58\u5360\u7528\u589e\u52a0 14\uff0c\u6240\u4ee5\u6bcf\u4e2a k-v \u5360\u7528 14 \u5b57\u8282\uff1b\u5f53\u503c\u4e3a 0 \u65f6\uff0c\u6bcf\u591a\u4e00\u4e2a\u5b57\u6bb5\uff0c\u5185\u5b58\u5360\u7528\u589e\u52a0 6\uff0c\u5373\u6bcf\u4e2a k-v \u7684\u5185\u5b58\u5360\u7528\u662f 6\uff0c\u521a\u597d\u5c11\u4e86 8 \u5b57\u8282<\/p>\n
    \u6240\u4ee5\u6211\u4eec\u57fa\u672c\u53ef\u4ee5\u786e\u5b9a\uff0c10 \u4f4d\u7684\u6574\u6570\uff0c\u5185\u5b58\u5360\u7528\u662f 8 \u5b57\u8282\uff0c\u800c 0 \u5728\u5927\u91cf\u91cd\u7528\u65f6\uff0c\u57fa\u672c\u53ef\u4ee5\u8ba4\u4e3a\u662f\u4e0d\u5360\u7528\u5185\u5b58\u7684<\/p>\n
    127.0.0.1:6379> hset key3 f1 ""\n(integer) 1\n127.0.0.1:6379> memory usage key3\n(integer) 65\n127.0.0.1:6379> hset key3 f2 ""\n(integer) 1\n127.0.0.1:6379> memory usage key3\n(integer) 71\n127.0.0.1:6379> hset key3 f3 ""\n(integer) 1\n127.0.0.1:6379> memory usage key3\n(integer) 77<\/code><\/pre>\n
    \u6709\u8da3\u7684\u662f\uff0c\u4f7f\u7528 hash \u65f6\u7a7a\u5b57\u7b26\u4e32\u548c 0 \u7684\u5185\u5b58\u5360\u7528\u662f\u4e00\u81f4\u7684<\/p>\n
    hash vs set vs bitmap<\/h2>\n
    \u5728\u5206\u4eab\u91cc\u9488\u5bf9\u540c\u4e00\u4e2a\u4e1a\u52a1\u9700\u6c42\uff0c\u63d0\u4f9b\u51e0\u79cd\u4e0d\u540c\u7684\u65b9\u6848\u6765\u5b9e\u73b0\uff0c\u6211\u4eec\u6765\u7814\u7a76\u4e0b\u5404\u65b9\u6848\u7684\u5185\u5b58\u6d88\u8017\u60c5\u51b5<\/p>\n
    127.0.0.1:6379> hset t:ac12041c01717cd2d48200000000 e0 "" e1 "" e2 "" c0 ""\n(integer) 4\n127.0.0.1:6379> memory usage t:ac12041c01717cd2d48200000000\n(integer) 109\n127.0.0.1:6379> hset t:ac12041c01717cd2d48200000001 e0 0 e1 0 e2 0 c0 0\n(integer) 4\n127.0.0.1:6379> memory usage t:ac12041c01717cd2d48200000001\n(integer) 109\n127.0.0.1:6379> sadd t:ac12041c01717cd2d48200000002 0 2 4 1\n(integer) 4\n127.0.0.1:6379> memory usage t:ac12041c01717cd2d48200000002\n(integer) 90\n127.0.0.1:6379> setbit t:ac12041c01717cd2d48200000003 0 1\n(integer) 1\n127.0.0.1:6379> setbit t:ac12041c01717cd2d48200000003 1 1\n(integer) 0\n127.0.0.1:6379> setbit t:ac12041c01717cd2d48200000003 2 1\n(integer) 0\n127.0.0.1:6379> setbit t:ac12041c01717cd2d48200000003 5 1\n(integer) 0\n127.0.0.1:6379> memory usage t:ac12041c01717cd2d48200000003\n(integer) 77<\/code><\/pre>\n
    \u53ef\u89c1\uff0c\u5bf9\u4e8e\u4e00\u6b21\u4ee5\u4e0a\u7684\u53bb\u91cd\u5224\u65ad\uff0c\u5185\u5b58\u5360\u7528\u662f hash > set > bitmap<\/p>\n
    \u5982\u679c\u53ea\u9700\u8981\u505a\u4e00\u6b21\u53bb\u91cd\u5224\u65ad\u5462\uff1f<\/p>\n
    127.0.0.1:6379> hset t:ac12041c01717cd2d48200000000 e0 0\n(integer) 1\n127.0.0.1:6379> memory usage t:ac12041c01717cd2d48200000000\n(integer) 91\n127.0.0.1:6379> hset t:ac12041c01717cd2d48200000001 e0 ""\n(integer) 1\n127.0.0.1:6379> memory usage t:ac12041c01717cd2d48200000001\n(integer) 91\n127.0.0.1:6379> sadd t:ac12041c01717cd2d48200000002 0\n(integer) 1\n127.0.0.1:6379> memory usage t:ac12041c01717cd2d48200000002\n(integer) 84\n127.0.0.1:6379> setbit t:ac12041c01717cd2d48200000003 0 1\n(integer) 0\n127.0.0.1:6379> memory usage t:ac12041c01717cd2d48200000003\n(integer) 77\n127.0.0.1:6379> setnx t:ac12041c01717cd2d48200000004 0\n(integer) 1\n127.0.0.1:6379> memory usage t:ac12041c01717cd2d48200000004\n(integer) 74<\/code><\/pre>\n
    \u7ed3\u8bba\u4e0d\u53d8<\/p>\n
    bitmap \u6269\u5c55<\/h2>\n
    \u8003\u8651\u4e00\u79cd\u6781\u7aef\u7684\u60c5\u51b5\uff0c\u4e0b\u53d1\u4e86 t \u4e2a\u5e7f\u544a\uff0c\u73b0\u5728\u6709\u4e00\u4e2a\u5e8f\u53f7\u9760\u540e\u7684\u5e7f\u544a n \u4e0a\u62a5\u4e86\u70b9\u51fb\uff0c\u8981\u5224\u65ad\u8be5\u6b64\u70b9\u51fb\u662f\u5426\u91cd\u590d<\/p>\n
      \n
    • \u5bf9\u4e8e hash \u6765\u8bf4\uff0c\u53ea\u8981\u521b\u5efa\u4e00\u4e2a field c{n}<\/code><\/li>\n
    • \u5982\u679c\u662f set\uff0c\u8981\u6dfb\u52a0\u4e00\u4e2a\u5143\u7d20 2 * n + 1<\/code><\/li>\n
    • \u5982\u679c\u662f bitmap\uff0c\u56e0\u4e3a\u70b9\u51fb\u7684\u4f4d\u7f6e\u662f n + t<\/code>\uff0c\u5982\u679c n \u548c t \u7684\u7edd\u5bf9\u503c\u90fd\u8f83\u5927\uff0c\u610f\u5473\u7740\u6211\u4eec\u9700\u8981\u6269\u5c55 bitmap\uff0c\u8fd9\u6837\u6269\u5c55\u8fc7\u540e\u7684 bitmap \u5728\u5185\u5b58\u6d88\u8017\u4e0a\u7684\u4f18\u52bf\u53ef\u80fd\u5c31\u4e0d\u590d\u5b58\u5728\u4e86<\/li>\n<\/ul>\n
      \u6211\u4eec\u6765\u7814\u7a76\u4e0b bitmap \u7684\u6269\u5c55<\/p>\n
      127.0.0.1:6379> setbit t:ac12041c01717cd2d48200000003 0 1\n(integer) 0\n127.0.0.1:6379> memory usage t:ac12041c01717cd2d48200000003\n(integer) 77\n127.0.0.1:6379> setbit t:ac12041c01717cd2d48200000003 1 1\n(integer) 0\n127.0.0.1:6379> memory usage t:ac12041c01717cd2d48200000003\n(integer) 77\n127.0.0.1:6379> setbit t:ac12041c01717cd2d48200000003 7 1\n(integer) 0\n127.0.0.1:6379> memory usage t:ac12041c01717cd2d48200000003\n(integer) 77\n127.0.0.1:6379> setbit t:ac12041c01717cd2d48200000003 8 1\n(integer) 0\n127.0.0.1:6379> memory usage t:ac12041c01717cd2d48200000003\n(integer) 82\n127.0.0.1:6379> setbit t:ac12041c01717cd2d48200000003 15 1\n(integer) 0\n127.0.0.1:6379> memory usage t:ac12041c01717cd2d48200000003\n(integer) 82\n127.0.0.1:6379> setbit t:ac12041c01717cd2d48200000003 16 1\n(integer) 0\n127.0.0.1:6379> memory usage t:ac12041c01717cd2d48200000003\n(integer) 82\n127.0.0.1:6379> setbit t:ac12041c01717cd2d48200000003 24 1\n(integer) 0\n127.0.0.1:6379> memory usage t:ac12041c01717cd2d48200000003\n(integer) 82<\/code><\/pre>\n
      \u521d\u6b21\u8c03\u7528 setbit<\/code> \u65f6\uff0c\u53ea\u5206\u914d\u4e86 1<\/code> \u4e2a\u5b57\u8282\u7684\u4f4d\u56fe, \u5f53\u4f4d\u56fe\u9700\u8981\u6269\u5c55\u65f6\uff0c\u4f1a\u4e00\u6b21\u6269\u5c55 5<\/code> \u4e2a\u5b57\u8282<\/p>\n
      \u7ed3\u8bba<\/p>\n
        \n
      • \u5bf9\u4e8e\u5355\u4e2a\u5143\u7d20\uff0cbitmap \u6269\u5c55\u4e00\u6b21\u4ee5\u540e\u7684\u5185\u5b58\u5360\u7528(82)\uff0c\u4f9d\u7136\u4f4e\u4e8e hash(91)\/set(84)<\/li>\n
      • \u4ece\u5b9e\u9645\u4e1a\u52a1\u89d2\u5ea6\uff0c\u5e8f\u53f7\u9760\u524d\u7684\u5e7f\u544a\uff0c\u66dd\u5149\u6982\u7387\u66f4\u5927\uff1b\u800c\u70b9\u51fb\u603b\u662f\u5c0f\u6982\u7387\u4e8b\u4ef6\uff0c\u8fd9\u610f\u5473\u7740\uff1a\u4e00\u6b21\u4e0b\u53d1\u591a\u4e2a\u5e7f\u544a\uff0c\u53ea\u6709\u4e00\u4e2a\u5e8f\u53f7\u9760\u540e\u7684\u5e7f\u544a\u4e0a\u62a5\u4e86\u70b9\u51fb\u4e8b\u4ef6\u662f\u4e0d\u592a\u53ef\u80fd\u7684<\/li>\n<\/ul>\n
        string vs list vs hash vs set<\/h3>\n
        \u5728 redis \u91cc\u4fdd\u5b58 6 \u4e2a\u6570\u5b57: 123456 234561 345612 456123 561234 612345<\/code>
        \n\u6570\u636e\u7ed3\u6784\u5206\u522b\u662f string<\/code>(\u7528\u9017\u53f7\u62fc\u63a5), list<\/code>, hash<\/code>, set<\/code><\/p>\n
        127.0.0.1:6379> set key1 '123456,234561,345612,456123,561234,612345'\nOK\n127.0.0.1:6379> object encoding key1\n"embstr"\n127.0.0.1:6379> memory usage key1\n(integer) 91\n\n127.0.0.1:6379> lpush key2 123456 234561 345612 456123 561234 612345\n(integer) 6\n127.0.0.1:6379> object encoding key2\n"quicklist"\n127.0.0.1:6379> memory usage key2\n(integer) 161\n\n127.0.0.1:6379> hset key3 123456 0 234561 0 345612 0 456123 0 561234 0 612345 0\n(integer) 6\n127.0.0.1:6379> hgetall key3\n 1) "123456"\n 2) "0"\n 3) "234561"\n 4) "0"\n 5) "345612"\n 6) "0"\n 7) "456123"\n 8) "0"\n 9) "561234"\n10) "0"\n11) "612345"\n12) "0"\n127.0.0.1:6379> object encoding key3\n"ziplist"\n127.0.0.1:6379> memory usage key3\n(integer) 101\n\n127.0.0.1:6379> sadd key4 123456 234561 345612 456123 561234 612345\n(integer) 6\n127.0.0.1:6379> memory usage key4\n(integer) 80\n127.0.0.1:6379> object encoding key4\n"intset"<\/code><\/pre>\n
        \u7ed3\u8bba\uff1alist > hash > string > set<\/p>\n","protected":false},"excerpt":{"rendered":"
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