{"id":760,"date":"2017-01-11T14:05:24","date_gmt":"2017-01-11T06:05:24","guid":{"rendered":"http:\/\/www.shuran.cn\/?p=760"},"modified":"2017-01-11T14:05:24","modified_gmt":"2017-01-11T06:05:24","slug":"mysql%e5%86%85%e5%ad%98%e8%a1%a8%e7%9a%84%e7%89%b9%e6%80%a7%e4%b8%8e%e4%bd%bf%e7%94%a8%e4%bb%8b%e7%bb%8d","status":"publish","type":"post","link":"https:\/\/www.shuran.cn\/?p=760","title":{"rendered":"MySQL\u5185\u5b58\u8868\u7684\u7279\u6027\u4e0e\u4f7f\u7528\u4ecb\u7ecd"},"content":{"rendered":"

\n\t\u5185\u5b58\u8868\uff0c\u5c31\u662f\u653e\u5728\u5185\u5b58\u4e2d\u7684\u8868\uff0c\u6240\u4f7f\u7528\u5185\u5b58\u7684\u5927\u5c0f\u53ef\u901a\u8fc7My.cnf\u4e2d\u7684max_heap_table_size\u6307\u5b9a\uff0c\u5982max_heap_table_size=1024M\uff0c<\/span>\n<\/p>\n

\n\t\u5185\u5b58\u8868\u4e0e\u4e34\u65f6\u8868\u5e76\u4e0d\u76f8\u540c\uff0c\u4e34\u65f6\u8868\u4e5f\u662f\u5b58\u653e\u5728\u5185\u5b58\u4e2d\uff0c\u4e34\u65f6\u8868\u6700\u5927\u6240\u9700\u5185\u5b58\u9700\u8981\u901a\u8fc7tmp_table_size = 128M\u8bbe\u5b9a\u3002\u5f53\u6570\u636e\u8d85\u8fc7\u4e34\u65f6\u8868\u7684\u6700\u5927\u503c\u8bbe\u5b9a\u65f6\uff0c\u81ea\u52a8\u8f6c\u4e3a\u78c1\u76d8\u8868\uff0c\u6b64\u65f6\u56e0\u9700\u8981\u8fdb\u884cIO\u64cd\u4f5c\uff0c\u6027\u80fd\u4f1a\u5927\u5927\u4e0b\u964d\uff0c<\/span>\n<\/p>\n

\n\t\u800c\u5185\u5b58\u8868\u4e0d\u4f1a\uff0c\u5185\u5b58\u8868\u6ee1\u540e\uff0c\u4f1a\u63d0\u793a\u6570\u636e\u6ee1\u9519\u8bef\u3002<\/span>\n<\/p>\n

\n\t\u4e34\u65f6\u8868\u548c\u5185\u5b58\u8868\u90fd\u53ef\u4ee5\u4eba\u5de5\u521b\u5efa\uff0c\u4f46\u4e34\u65f6\u8868\u66f4\u591a\u7684\u4f5c\u7528\u662f\u7cfb\u7edf\u81ea\u5df1\u521b\u5efa\u540e\uff0c\u7ec4\u7ec7\u6570\u636e\u4ee5\u63d0\u5347\u6027\u80fd\uff0c\u5982\u5b50\u67e5\u8be2\uff0c\u4e34\u65f6\u8868\u5728\u591a\u4e2a\u8fde\u63a5\u4e4b\u95f4\u4e0d\u80fd\u5171\u4eab\u3002\u8fd9\u91cc\u53ea\u8ba8\u8bba\u5185\u5b58\u8868\n<\/p>\n

\n\t\u521b\u5efa\u8868\u662f\uff0c\u7528engine=heap\u53ef\u521b\u5efa\uff08mysql5.5\u4e2d\u5df2\u7ecf\u4e0d\u652f\u6301type\uff0c\u4ee5\u540e\u90fd\u7528engine\uff0c\u5f62\u6210\u4e60\u60ef\uff09\u3002\n<\/p>\n

\n\t\n<\/p>\n

create table test(\r\n\tid int unsigned not null auto_increment primary key,\r\n\tstate char(10),\r\n\ttype char(20),\r\n\tdate char(30)\r\n)ENGINE=MEMORY DEFAULT CHARSET=utf8;<\/pre>\n
\n\t\u5185\u5b58\u8868\u7684\u7279\u6027
\n<\/h4>\n
    \n
      \n
    1. \n\t\t\t\u5185\u5b58\u8868\u7684\u8868\u5b9a\u4e49\u662f\u5b58\u653e\u5728\u78c1\u76d8\u4e0a\u7684\uff0c\u6269\u5c55\u540d\u4e3a.frm\uff0c \u6240\u4ee5\u91cd\u542f\u4e0d\u4f1a\u4e22\u5931\u3002\n\t\t<\/li>\n
    2. \n\t\t\t\u5185\u5b58\u8868\u7684\u6570\u636e\u662f\u5b58\u653e\u5728\u5185\u5b58\u4e2d\u7684\uff0c\u6240\u4ee5\u91cd\u542f\u4f1a\u4e22\u5931\u6570\u636e\u3002<\/span>\n\t\t<\/li>\n
    3. \n\t\t\t\u5185\u5b58\u8868\u4f7f\u7528\u4e00\u4e2a\u56fa\u5b9a\u7684\u8bb0\u5f55\u957f\u5ea6\u683c\u5f0f\u3002\n\t\t<\/li>\n
    4. \n\t\t\t\u5185\u5b58\u8868\u4e0d\u652f\u6301BLOB\u6216TEXT\u5217\uff0c\u6bd4\u5982varchar\u4e0etext\u5b57\u6bb5\u5c31\u4e0d\u4f1a\u88ab\u652f\u6301\u3002<\/span>\n\t\t<\/li>\n
    5. \n\t\t\t\u5185\u5b58\u8868\u652f\u6301AUTO_INCREMENT\u5217\u548c\u5bf9\u53ef\u5305\u542bNULL\u503c\u7684\u5217\u7684\u7d22\u5f15\uff08\u7f51\u4e0a\u5927\u591a\u8bf4\u4e0d\u652f\u6301\uff0c\u8fd9\u662f\u9519\u8bef\u7684\uff09\u3002\u5185\u5b58\u8868\u652f\u6301\u5927\u4e8e(>) \u5c0f\u4e8e( <)\u64cd\u4f5c\uff0c\u7f51\u4e0a\u4e5f\u8bf4\u4e0d\u652f\u6301\u3002\n\t\t<\/li>\n
    6. \n\t\t\tmysql\u91cd\u542f\u540e\uff0c\u4e3b\u952e\u3001\u81ea\u589e\u3001\u7d22\u5f15\u4ecd\u7136\u5b58\u5728\uff0c\u53ea\u662f\u6570\u636e\u4e22\u5931\u3002\u8fd9\u4e5f\u662f\u5bf9\u7f51\u4e0a\u7684\u4e00\u4e9b\u9519\u8bef\u6587\u5b57\u7ea0\u6b63\u3002<\/span>\n\t\t<\/li>\n
    7. \n\t\t\t\u5185\u5b58\u8868\u8868\u5728\u6240\u6709\u5ba2\u6237\u7aef\u4e4b\u95f4\u5171\u4eab\uff08\u5c31\u50cf\u5176\u5b83\u4efb\u4f55\u975eTEMPORARY\u8868\uff09\u3002<\/span>\n\t\t<\/li>\n
    8. \n\t\t\tMEMORY\u5b58\u50a8\u5f15\u64ce\u6267\u884cHASH\u548cBTREE\u7d22\u5f15\u3002\u4f60\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u4e00\u4e2a\u5982\u4e0b\u6240\u793a\u7684USING\u5b50\u53e5\u4e3a\u7ed9\u5b9a\u7684\u7d22\u5f15\u6307\u5b9a\u4e00\u4e2a\u6216\u53e6\u4e00\u4e2a\uff1a\n\t\t<\/li>\n<\/ol>\n<\/ol>\n
      \n\t\n<\/p>\n
      \tCREATE TABLE lookup (id INT, INDEX USING HASH (id)) ENGINE = MEMORY;\r\n\tCREATE TABLE lookup (id INT, INDEX USING BTREE (id)) ENGINE = MEMORY;<\/pre>\n
      \n\t\n<\/p>\n
      \n\t\n<\/p>\n
      \n
      \n
      \n\t\t<\/div>\n<\/p><\/div>\n<\/div>\n
      \n\t\u5185\u5b58\u8868\u521d\u59cb\u5316\uff0c\u53ef\u4ee5\u4f7f\u7528--init-file\u6765\u521d\u59cb\u5316\uff0c\u907f\u514d\u91cd\u542fmysql\u540e\u6570\u636e\u88ab\u6e05\u7a7a\u3002\u6bd4\u5982--init-file=\"\/data\/mysql\/init.sql\", init.sql\u683c\u5f0f\u4e3a\uff1a\n<\/p>\n
        \n
      1. \n\t\t\u5728\u6570\u636e\u5e93\u590d\u5236\u65f6\uff0c\u5982\u679c\u4e3b\u673a\u5f53\u6389\uff0c\u5219\u4f1a\u5728binLog\u4e2d\u81ea\u52a8\u52a0\u5165delete from [\u5185\u5b58\u8868]\uff0c\u5c06slave\u7684\u6570\u636e\u4e5f\u5220\u9664\u6389\uff0c\u4ee5\u4fdd\u8bc1\u4e24\u8fb9\u7684\u6570\u636e\u4e00\u81f4\u6027\u3002\n\t<\/li>\n
      2. \n\t\t\u5185\u5b58\u8868\u4e0d\u652f\u6301\u4e8b\u52a1\u3002<\/span>\n\t<\/li>\n
      3. \n\t\t\u5185\u5b58\u8868\u662f\u8868\u9501\uff0c\u5f53\u4fee\u6539\u9891\u7e41\u65f6\uff0c\u6027\u80fd\u53ef\u80fd\u4f1a\u4e0b\u964d\u3002<\/span>\n\t<\/li>\n<\/ol>\n
        \n\t\u5185\u5b58\u8868\u7684\u4f7f\u7528
        \n<\/h4>\n
        \n\t\u5185\u5b58\u8868\u4f7f\u7528\u54c8\u5e0c\u6563\u5217\u7d22\u5f15\u628a\u6570\u636e\u4fdd\u5b58\u5728\u5185\u5b58\u4e2d\uff0c\u56e0\u6b64\u5177\u6709\u6781\u5feb\u7684\u901f\u5ea6\uff0c\u9002\u5408\u7f13\u5b58\u4e2d\u5c0f\u578b\u6570\u636e\u5e93\uff0c\u4f46\u662f\u4f7f\u7528\u4e0a\u53d7\u5230\u4e00\u4e9b\u9650\u5236\u3002\n<\/p>\n
          \n
        1. \n\t\theap \u5bf9\u6240\u6709\u7528\u6237\u7684\u8fde\u63a5\u662f\u53ef\u89c1\u7684\uff0c\u8fd9\u4f7f\u5f97\u5b83\u975e\u5e38\u9002\u5408\u505a\u7f13\u5b58\u3002\n\t<\/li>\n
        2. \n\t\t\u4ec5\u9002\u5408\u4f7f\u7528\u7684\u573a\u5408\u3002heap\u4e0d\u5141\u8bb8\u4f7f\u7528xxxTEXT\u548cxxxBLOB\u6570\u636e\u7c7b\u578b\u3002\u6ce8\uff1a\u64cd\u4f5c\u7b26 \u201c<=>\u201d \u8bf4\u660e\uff1aNULL-safe equal.\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u548c\u201c=\u201d\u64cd\u4f5c\u7b26\u6267\u884c\u76f8\u540c\u7684\u6bd4\u8f83\u64cd\u4f5c\uff0c\u4e0d\u8fc7\u5728\u4e24\u4e2a\u64cd\u4f5c\u7801\u5747\u4e3aNULL\u65f6\uff0c\u5176\u6240\u5f97\u503c\u4e3a1\u800c\u4e0d\u4e3aNULL\uff0c\u800c\u5f53\u4e00\u4e2a\u64cd\u4f5c\u7801\u4e3aNULL\u65f6\uff0c\u5176\u6240\u5f97\u503c\u4e3a0\u800c\u4e0d\u4e3aNULL\u3002\n\t<\/li>\n
        3. \n\t\t\u4e00\u65e6\u670d\u52a1\u5668\u91cd\u542f\uff0c\u6240\u6709heap\u8868\u6570\u636e\u4e22\u5931\uff0c\u4f46\u662fheap\u8868\u7ed3\u6784\u4ecd\u7136\u5b58\u5728\uff0c\u56e0\u4e3aheap\u8868\u7ed3\u6784\u662f\u5b58\u653e\u5728\u5b9e\u9645\u6570\u636e\u5e93\u8def\u5f84\u4e0b\u7684\uff0c\u4e0d\u4f1a\u81ea\u52a8\u5220\u9664\u3002\u91cd\u542f\u4e4b\u540e\uff0cheap\u5c06\u88ab\u6e05\u7a7a\uff0c\u8fd9\u65f6\u5019\u5bf9heap\u7684\u67e5\u8be2\u7ed3\u679c\u90fd\u662f\u7a7a\u7684\u3002\n\t<\/li>\n
        4. \n\t\t\u5982\u679cheap\u662f\u590d\u5236\u7684\u67d0\u6570\u636e\u8868\uff0c\u5219\u590d\u5236\u4e4b\u540e\u6240\u6709\u4e3b\u952e\u3001\u7d22\u5f15\u3001\u81ea\u589e\u7b49\u683c\u5f0f\u5c06\u4e0d\u590d\u5b58\u5728\uff0c\u9700\u8981\u91cd\u65b0\u6dfb\u52a0\u4e3b\u952e\u548c\u7d22\u5f15\uff0c\u5982\u679c\u9700\u8981\u7684\u8bdd\u3002\n\t<\/li>\n
        5. \n\t\t\u5bf9\u4e8e\u91cd\u542f\u9020\u6210\u7684\u6570\u636e\u4e22\u5931\uff0c\u6709\u4ee5\u4e0b\u7684\u89e3\u51b3\u529e\u6cd5\uff1a\n\t<\/li>\n