\n\n1\u3001\u65e5\u5fd7\u4ea7\u751f\u7684\u6027\u80fd\u5f71\u54cd:<\/strong>\n\u7531\u4e8e\u65e5\u5fd7\u7684\u8bb0\u5f55\u5e26\u6765\u7684\u76f4\u63a5\u6027\u80fd\u635f\u8017\u5c31\u662f\u6570\u636e\u5e93\u7cfb\u7edf\u4e2d\u6700\u4e3a\u6602\u8d35\u7684IO\u8d44\u6e90\u3002MySQL\u7684\u65e5\u5fd7\u5305\u62ec\u9519\u8bef\u65e5\u5fd7\uff08ErrorLog\uff09\uff0c\u66f4\u65b0\u65e5\u5fd7\uff08UpdateLog\uff09\uff0c\u4e8c\u8fdb\u5236\u65e5\u5fd7\uff08Binlog\uff09\uff0c\u67e5\u8be2\u65e5\u5fd7\uff08QueryLog\uff09\uff0c\u6162\u67e5\u8be2\u65e5\u5fd7\uff08SlowQueryLog\uff09\u7b49\u3002\u5f53\u7136\uff0c\u66f4\u65b0\u65e5\u5fd7\u662f\u8001\u7248\u672c\u7684MySQL\u624d\u6709\u7684\uff0c\u76ee\u524d\u5df2\u7ecf\u88ab\u4e8c\u8fdb\u5236\u65e5\u5fd7\u66ff\u4ee3\u3002\n\n\u5728\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u7cfb\u7edf\u4ec5\u4ec5\u6253\u5f00\u9519\u8bef\u65e5\u5fd7\uff0c\u5173\u95ed\u4e86\u5176\u4ed6\u6240\u6709\u65e5\u5fd7\uff0c\u4ee5\u8fbe\u5230\u5c3d\u53ef\u80fd\u51cf\u5c11IO\u635f\u8017\u63d0\u9ad8\u7cfb\u7edf\u6027\u80fd\u7684\u76ee\u7684\u3002\u4f46\u662f\u5728\u4e00\u822c\u7a0d\u5fae\u91cd\u8981\u4e00\u70b9\u7684\u5b9e\u9645\u5e94\u7528\u573a\u666f\u4e2d\uff0c\u90fd\u81f3\u5c11\u9700\u8981\u6253\u5f00\u4e8c\u8fdb\u5236\u65e5\u5fd7\uff0c\u56e0\u4e3a\u8fd9\u662fMySQL\u5f88\u591a\u5b58\u50a8\u5f15\u64ce\u8fdb\u884c\u589e\u91cf\u5907\u4efd\u7684\u57fa\u7840\uff0c\u4e5f\u662fMySQL\u5b9e\u73b0\u590d\u5236\u7684\u57fa\u672c\u6761\u4ef6\u3002\u6709\u65f6\u5019\u4e3a\u4e86\u8fdb\u4e00\u6b65\u7684\u6027\u80fd\u4f18\u5316\uff0c\u5b9a\u4f4d\u6267\u884c\u8f83\u6162\u7684SQL\u8bed\u53e5\uff0c\u5f88\u591a\u7cfb\u7edf\u4e5f\u4f1a\u6253\u5f00\u6162\u67e5\u8be2\u65e5\u5fd7\u6765\u8bb0\u5f55\u6267\u884c\u65f6\u95f4\u8d85\u8fc7\u7279\u5b9a\u6570\u503c\uff08\u7531\u6211\u4eec\u81ea\u884c\u8bbe\u7f6e\uff09\u7684SQL\u8bed\u53e5\u3002\n\n\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u5728\u751f\u4ea7\u7cfb\u7edf\u4e2d\u5f88\u5c11\u6709\u7cfb\u7edf\u4f1a\u6253\u5f00\u67e5\u8be2\u65e5\u5fd7\u3002\u56e0\u4e3a\u67e5\u8be2\u65e5\u5fd7\u6253\u5f00\u4e4b\u540e\u4f1a\u5c06MySQL\u4e2d\u6267\u884c\u7684\u6bcf\u4e00\u6761Query\u90fd\u8bb0\u5f55\u5230\u65e5\u5fd7\u4e2d\uff0c\u4f1a\u8be5\u7cfb\u7edf\u5e26\u6765\u6bd4\u8f83\u5927\u7684IO\u8d1f\u62c5\uff0c\u800c\u5e26\u6765\u7684\u5b9e\u9645\u6548\u76ca\u5374\u5e76\u4e0d\u662f\u975e\u5e38\u5927\u3002\u4e00\u822c\u53ea\u6709\u5728\u5f00\u53d1\u6d4b\u8bd5\u73af\u5883\u4e2d\uff0c\u4e3a\u4e86\u5b9a\u4f4d\u67d0\u4e9b\u529f\u80fd\u5177\u4f53\u4f7f\u7528\u4e86\u54ea\u4e9bSQL\u8bed\u53e5\u7684\u65f6\u5019\uff0c\u624d\u4f1a\u5728\u77ed\u65f6\u95f4\u6bb5\u5185\u6253\u5f00\u8be5\u65e5\u5fd7\u6765\u505a\u76f8\u5e94\u7684\u5206\u6790\u3002\u6240\u4ee5\uff0c\u5728MySQL\u7cfb\u7edf\u4e2d\uff0c\u4f1a\u5bf9\u6027\u80fd\u4ea7\u751f\u5f71\u54cd\u7684MySQL\u65e5\u5fd7\uff08\u4e0d\u5305\u62ec\u5404\u5b58\u50a8\u5f15\u64ce\u81ea\u5df1\u7684\u65e5\u5fd7\uff09\u4e3b\u8981\u5c31\u662fBinlog\u4e86\u3002\n\n<\/div>\n
2\u3001mysql\u5185\u6267\u884c\u5982\u4e0b\u6307\u4ee4\uff1a<\/strong><\/div>\n
set global sync_binlog=500;<\/div>\n
\u5f53\u6bcf\u8fdb\u884c500\u6b21\u4e8b\u52a1\u63d0\u4ea4\u4e4b\u540e\uff0cMySQL\u5c06\u8fdb\u884c\u4e00\u6b21fsync\u4e4b\u7c7b\u7684\u78c1\u76d8\u540c\u6b65\u6307\u4ee4\u6765\u5c06binlog_cache\u4e2d\u7684\u6570\u636e\u5f3a\u5236\u5199\u5165\u78c1\u76d8\u3002<\/div>\n
set global innodb_flush_log_at_trx_commit=2;<\/div>\n
\u9ed8\u8ba4\u503c1\u4ee3\u8868\u6bcf\u4e00\u6b21\u4e8b\u52a1\u63d0\u4ea4\u6216\u4e8b\u52a1\u5916\u7684\u6307\u4ee4\u90fd\u9700\u8981\u628a\u65e5\u5fd7\u5199\u5165\uff08flush\uff09\u786c\u76d8\uff0c\u8fd9\u662f\u5f88\u8d39\u65f6\u7684\u3002\u7279\u522b\u662f\u4f7f\u7528\u7535\u6c60\u4f9b\u7535\u7f13\u5b58\uff08Battery backed up cache\uff09\u65f6\u3002\u8bbe\u7f6e\u4e3a2\u4ee3\u8868\u4e0d\u5199\u5165\u786c\u76d8\u800c\u662f\u5199\u5165\u7cfb\u7edf\u7f13\u5b58\u3002\u65e5\u5fd7\u4ecd\u7136\u4f1a\u6bcf\u79d2flush\u5230\u786c\u76d8\uff0c\u6240\u4ee5\u4f60\u4e00\u822c\u4e0d\u4f1a\u4e22\u5931\u8d85\u8fc71-2\u79d2\u7684\u66f4\u65b0\u3002\u8bbe\u62100\u4f1a\u66f4\u5feb\u4e00\u70b9\uff0c\u4f46\u5b89\u5168\u65b9\u9762\u6bd4\u8f83\u5dee\uff0c\u5373\u4f7fMySQL\u6302\u4e86\u4e5f\u53ef\u80fd\u4f1a\u4e22\u5931\u4e8b\u52a1\u7684\u6570\u636e\u3002\u800c\u503c\u8bbe\u7f6e\u4e3a2\u53ea\u4f1a\u5728\u6574\u4e2a\u64cd\u4f5c\u7cfb\u7edf\u5b95\u673a\u65f6\u624d\u53ef\u80fd\u4e22\u6570\u636e\u3002<\/div>\n
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\n
\n\n\u6d4b\u8bd5\u73af\u5883\uff1a\n\nRed Hat Enterprise Linux Server release 6.3 (Santiago)\n\nServer version: 5.6.22-log MySQL Community Server (GPL)\n\n<\/div>\n\u6211\u642d\u5efa\u4e861\u4e3b3\u4ece\u7684\u73af\u5883\uff0c\u51c6\u5907\u6d4b\u8bd5MHA\u67b6\u6784\uff0c\u8fc7\u7a0b\u4e2d\u53d1\u73b0\uff0c\u6d4b\u8bd5\u5e76\u53d1\u63d2\u5165\u7684\u65f6\u5019\uff0c\u4ece\u5e931\u53ef\u4ee5\u8ddf\u4e0a\uff0c\u4ece\u5e932,3\u8ddf\u4e0d\u4e0a\n\n\u5982\u4f55\u5224\u65ad\u662fio thread\u6162\u8fd8\u662f sql thread\u6162\u5462\uff0c\u6709\u4e2a\u65b9\u6cd5\uff0c\u89c2\u5bdfshow slave status\\G ,\n
\n\n\u5224\u65ad3\u4e2a\u53c2\u6570\uff08\u53c2\u6570\u540e\u9762\u7684\u503c\u662f\u9ed8\u8ba4\u7a7a\u95f2\u65f6\u5019\u7684\u6b63\u5e38\u503c\uff09\uff1a\n\nSlave_IO_State: Waiting for master to send event\n\nSlave_SQL_Running_State: Slave has read all relay log; waiting for the slave I\/O thread to update it\n\nSeconds_Behind_Master: 0\n\n<\/div>\n
\n\n1.sql thread\u6162\u7684\u8868\u73b0\uff1a\n\nSeconds_Behind_Master\u8d8a\u6765\u8d8a\u5927\n\nSlave_SQL_Running_State: Reading event from the relay log\n\n<\/div>\n
\n\n2.io thread\u6162\u7684\u8868\u73b0\uff1a\n\nSeconds_Behind_Master\u4e3a0\n\nSlave_SQL_Running_State: \u663e\u793a\u6b63\u5e38\u503c\n\nSlave_IO_State:\u663e\u793a\u5fd9\u788c\u72b6\u6001\n\n<\/div>\n
\n\n\u800c\u6211\u89c2\u5bdf\u5230\u7684\u503c\u662f\n\nSlave_IO_State: Waiting for master to send event\n\nSeconds_Behind_Master: 313\n\nSlave_SQL_Running_State: Reading event from the relay log\n\n\u56e0\u6b64\u63a8\u65ad\u662fsql thread\u6162\n\n<\/div>\n
\n\n\u4e3a\u5565\u53ea\u6709slave2,3\u6162\uff0c\u800cslave1\u53ef\u4ee5\u8ddf\u4e0a\u5462\uff0c\u5f00\u59cb\u6000\u7591\u662f\u53c2\u6570\u914d\u7f6e\u7684\u5dee\u5f02\uff0c\u6bd4\u5bf9\/etc\/my.cnf\u540e\u53d1\u73b0\uff0c\u914d\u7f6e\u65e0\u5dee\u5f02\n\n\u56e0\u6b64\u6392\u9664\u8fd9\u4e2a\u539f\u56e0\uff0c\u540e\u6765\u7528dstat\u89c2\u5bdf\uff0c\u53d1\u73b0\u7e41\u5fd9\u65f6\u5019\uff0cslave\u7684IO\u5199\u901f\u5ea6\u4e0a\u4e0d\u53bb\n\nslave1\uff1a\n\n$ dstat\n\n—-total-cpu-usage—- -dsk\/total- -net\/total- —paging– —system–\n\nusr sys idl wai hiq siq| read writ| recv send| in out | int csw\n\n0 0 100 0 0 0|9308B 11k| 0 0 | 3B 3B| 63 63\n\n3 4 54 40 0 0| 88k 10M| 45k 9438B| 0 0 |1857 2579\n\n3 3 59 35 0 1| 80k 7552k| 40k 8486B| 0 0 |1675 2307\n\n3 3 56 38 0 0| 72k 7824k| 42k 8816B| 0 0 |1727 2348\n\n3 4 52 41 0 1| 96k 9688k| 49k 10k| 0 0 |2029 2874\n\n3 4 54 39 0 0| 96k 8880k| 45k 9410B| 0 0 |1905 2674\n\n3 3 53 40 0 1| 96k 9776k| 58k 10k| 0 0 |1935 2671\n\n3 3 58 36 0 0| 64k 7848k| 40k 8420B| 0 0 |1724 2357\n\n3 5 52 40 0 1| 96k 8936k| 49k 10k| 0 0 |1948 2680\n\n3 4 51 42 0 1| 96k 9400k| 49k 10k| 0 0 |1988 2760\n\n3 4 52 41 0 0| 88k 9752k| 49k 10k| 0 0 |2058 2868\n\n4 4 51 41 0 1| 96k 9680k| 49k 9938B| 0 0 |1990 2750\n\n3 3 59 35 0 0| 80k 7632k| 39k 8288B| 0 0 |1668 2275\n\n3 4 52 42 0 1| 80k 8504k| 46k 9146B| 0 0 |1860 2523\n\n3 4 51 42 0 0| 80k 8496k| 43k 8684B| 0 0 |1882 2516\n\n2 3 65 30 0 0| 64k 5976k| 30k 6440B| 0 0 |1326 1802\n\n3 4 53 40 0 1| 72k 8360k| 59k 10k| 0 0 |1859 2538\n\n3 4 51 42 0 1| 96k 8840k| 53k 10k| 0 0 |1958 2648\n\n2 4 51 43 0 0| 72k 7352k| 40k 7760B| 0 0 |1633 2219\n\n3 4 51 42 0 1| 88k 7920k| 31k 6770B| 0 0 |1767 2373\n\n3 3 54 40 0 0| 80k 8528k| 40k 8750B| 0 0 |1859 2549\n\nslave2:\n\n—-total-cpu-usage—- -dsk\/total- -net\/total- —paging– —system–\n\nusr sys idl wai hiq siq| read writ| recv send| in out | int csw\n\n2 1 50 47 0 1|8192B 1168k| 55k 10k| 0 0 | 533 771\n\n1 1 51 48 0 0|8192B 1048k| 33k 7046B| 0 0 | 427 622\n\n1 1 51 48 0 0|8192B 1080k| 58k 9806B| 0 0 | 500 709\n\n1 1 50 48 0 0| 0 1864k| 51k 8486B| 0 0 | 502 669\n\n1 2 51 47 0 0|8192B 1120k| 42k 8156B| 0 0 | 496 674\n\n1 1 51 47 0 0|8192B 1160k| 32k 6350B| 0 0 | 467 655\n\n1 2 51 47 0 0| 0 1288k| 50k 10k| 0 0 | 563 797\n\n1 1 51 47 0 0|8192B 1200k| 43k 8486B| 0 0 | 493 728\n\n2 1 50 47 0 0|8192B 1024k| 45k 8816B| 0 0 | 481 659\n\n1 1 50 48 0 0|8192B 1248k| 49k 9450B| 0 0 | 517 772\n\n1 1 50 48 0 0| 0 1264k| 47k 9146B| 0 0 | 516 756\n\n1 2 50 47 0 1|8192B 1144k| 50k 10k| 0 0 | 520 765\n\n1 1 51 48 0 0|8192B 1200k| 51k 8156B| 0 0 | 484 716\n\n1 2 50 48 0 0|8192B 968k| 50k 9278B| 0 0 | 470 684\n\n1 1 50 48 0 0|8192B 1128k| 39k 7892B| 0 0 | 476 679\n\n1 1 51 47 0 0| 0 1248k| 45k 9476B| 0 0 | 523 760\n\n1 2 50 48 0 0|8192B 1448k| 41k 7826B| 0 0 | 552 805\n\n1 1 50 48 0 0|8192B 1120k| 44k 8090B| 0 0 | 470 692\n\nslave3:\n\n—-total-cpu-usage—- -dsk\/total- -net\/total- —paging– —system–\n\nusr sys idl wai hiq siq| read writ| recv send| in out | int csw\n\n1 1 50 49 0 0|8192B 1328k|1167B 170B| 0 0 | 385 515\n\n1 1 51 48 0 0|8192B 1128k| 754B 170B| 0 0 | 325 449\n\n1 1 50 49 0 0| 0 920k| 474B 314B| 0 0 | 279 381\n\n0 1 50 49 0 0|8192B 664k|1633B 170B| 0 0 | 226 291\n\n1 1 50 49 0 0|8192B 1200k|1250B 170B| 0 0 | 353 475\n\n1 1 50 48 0 0| 0 1432k|1632B 170B| 0 0 | 402 551\n\n1 1 51 48 0 0| 16k 1752k|1045B 170B| 0 0 | 487 664\n\n1 1 50 48 0 0|8192B 1648k| 12k 170B| 0 0 | 461 636\n\n1 1 51 48 0 0| 0 1272k| 886B 170B| 0 0 | 380 501\n\n1 1 50 49 0 0|8192B 1000k|1023B 170B| 0 0 | 300 400\n\n1 1 50 48 0 0|8192B 1096k| 747B 170B| 0 0 | 332 442\n\n1 1 50 48 0 0|8192B 1448k|1003B 170B| 0 0 | 416 557\n\n1 1 50 48 0 0| 0 1592k|1174B 170B| 0 0 | 450 614\n\n1 1 51 48 0 0|8192B 1416k|1028B 170B| 0 0 | 404 552\n\n0 1 50 49 0 0|8192B 1128k|1031B 170B| 0 0 | 331 447\n\n1 1 51 48 0 0|8192B 1160k|1185B 170B| 0 0 | 340 458\n\n1 1 50 49 0 0| 0 1120k| 633B 170B| 0 0 | 326 453\n\n1 0 50 49 0 0|8192B 656k|8886B 170B| 0 0 | 221 288\n\n1 1 50 49 0 0|8192B 1128k|1619B 170B| 0 0 | 335 451\n\nslave1\u53ef\u4ee5\u8fbe\u5230\u6bcf\u79d29M\u7684\u5199\u5165IO,\u800cslave2,3\u53ea\u80fd\u8fbe\u5230\u6bcf\u79d21M\u591a\uff0cIO\u6027\u80fd\u5dee\u5f88\u591a\uff0c\u540e\u6765\u5206\u6790\u4e86\u4e0b\u5b58\u50a8\uff0c\u53d1\u73b0\u662f\u6709\u5f88\u5927\u5dee\u5f02\u7684\uff0c\u4e5f\u5370\u8bc1\u4e86\u6211\u7684\u63a8\u6d4b\n\n<\/div>\n
\n\n\u90a3\u4e48\u95ee\u9898\u6765\u4e86\uff0c\u8981\u5982\u4f55\u4f18\u5316IO\u6027\u80fd\u6bd4\u8f83\u5dee\u7684slave\u5462\uff0c\u5176\u5b9e\u5f88\u7b80\u5355\uff0c\u4fee\u6539\u4e24\u4e2a\u53c2\u6570\n\nmysql>SHOW VARIABLES like ‘%innodb_fl%’;<\/span>\n\nmysql>SHOW VARIABLES like ‘sync_binlog’;<\/span>\n\nmysql> set global sync_binlog=20 ;\n\nQuery OK, 0 rows affected (0.00 sec)\n\n<\/div>\nmysql> set global innodb_flush_log_at_trx_commit=2;Query OK, 0 rows affected (0.00 sec)\n
\n\ninnodb_flush_log_at_trx_commit\u548csync_binlog\u662fMySQL innodb\u5f15\u64ce\u7684\u4e24\u4e2a\u91cd\u8981\u7684\u53c2\u6570\uff0c\u5176\u4e2dinnodb_flush_log_at_trx_commit\u662f\u5c06\u4e8b\u52a1\u65e5\u5fd7\u4eceinnodb log buffer\u5199\u5165\u5230redo log\u4e2d\uff0csync_binlog\u662f\u5c06\u4e8c\u8fdb\u5236\u65e5\u5fd7\u6587\u4ef6\u5237\u65b0\u5230\u78c1\u76d8\u4e0a\u3002\n\ninnodb\u4e8b\u52a1\u65e5\u5fd7redo,binlog\u903b\u8f91\u8fc7\u7a0b\u5982\u4e0b:\n1.\u4e8b\u52a1\u5199\u5165redo log buffer\u4e2d\uff1b\n2.\u5c06log buffer\u5237\u65b0\u5230redo log\u4e2d\uff0c\u4e0d\u8fc7\u4f1a\u5148\u5199\u4e00\u4e2aTX PREPARE\u6807\u8bb0\uff1b\n3.\u5199binlog\n4.\u5728redo log\u4e2d\u5199\u5165TX COMMIT\u6807\u8bb0\uff1b\n5.\u5c06\u5199binlog\u6210\u529f\u7684\u6807\u8bb0\u5199\u5165redo log\u3002\n\n\u53c2\u6570\u89e3\u6790\u5982\u4e0b\uff1a\ninnodb_flush_log_at_trx_commit = N\uff1a\n\nN=0 \u00a0 \u00a0\u6bcf\u9694\u4e00\u79d2\uff0c\u628a\u4e8b\u52a1\u65e5\u5fd7\u7f13\u5b58\u533a\u7684\u6570\u636e\u5199\u5230\u65e5\u5fd7\u6587\u4ef6\u4e2d\uff0c\u4ee5\u53ca\u628a\u65e5\u5fd7\u6587\u4ef6\u7684\u6570\u636e\u5237\u65b0\u5230\u78c1\u76d8\u4e0a\uff1b\nlog buffer \u4f1a \u6bcf\u79d2\u5199\u5165\u5230\u65e5\u5fd7\u6587\u4ef6\u5e76\u5237\u5199\uff08flush\uff09\u5230\u78c1\u76d8\u3002\u4f46\u6bcf\u6b21\u4e8b\u52a1\u63d0\u4ea4\u4e0d\u4f1a\u6709\u4efb\u4f55\u5f71\u54cd\uff0c\u4e5f\u5c31\u662f log buffer \u7684\u5237\u5199\u64cd\u4f5c\u548c\u4e8b\u52a1\u63d0\u4ea4\u64cd\u4f5c\u6ca1\u6709\u5173\u7cfb\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0cMySQL\u6027\u80fd\u6700\u597d\uff0c\u4f46\u5982\u679c mysqld \u8fdb\u7a0b\u5d29\u6e83\uff0c\u901a\u5e38\u4f1a\u5bfc\u81f4\u6700\u540e 1s \u7684\u65e5\u5fd7\u4e22\u5931\u3002\n\nN=1 \u00a0 \u00a0\u6bcf\u4e2a\u4e8b\u52a1\u63d0\u4ea4\u65f6\u5019\uff0c\u628a\u4e8b\u52a1\u65e5\u5fd7\u4ece\u7f13\u5b58\u533a\u5199\u5230\u65e5\u5fd7\u6587\u4ef6\u4e2d\uff0c\u5e76\u4e14\u5237\u65b0\u65e5\u5fd7\u6587\u4ef6\u7684\u6570\u636e\u5230\u78c1\u76d8\u4e0a\uff1b\n\u5f53\u53d6\u503c\u4e3a 1 \u65f6\uff0c\u6bcf\u6b21\u4e8b\u52a1\u63d0\u4ea4\u65f6\uff0clog buffer \u4f1a\u88ab\u5199\u5165\u5230\u65e5\u5fd7\u6587\u4ef6\u5e76\u5237\u5199\u5230\u78c1\u76d8\u3002\u8fd9\u4e5f\u662f\u9ed8\u8ba4\u503c\u3002\u8fd9\u662f\u6700\u5b89\u5168\u7684\u914d\u7f6e\uff0c\u4f46\u7531\u4e8e\u6bcf\u6b21\u4e8b\u52a1\u90fd\u9700\u8981\u8fdb\u884c\u78c1\u76d8I\/O\uff0c\u6240\u4ee5\u4e5f\u6700\u6162\u3002\n\nN=2 \u00a0 \u00a0\u6bcf\u4e8b\u52a1\u63d0\u4ea4\u7684\u65f6\u5019\uff0c\u628a\u4e8b\u52a1\u65e5\u5fd7\u6570\u636e\u4ece\u7f13\u5b58\u533a\u5199\u5230\u65e5\u5fd7\u6587\u4ef6\u4e2d\uff1b\u6bcf\u9694\u4e00\u79d2\uff0c\u5237\u65b0\u4e00\u6b21\u65e5\u5fd7\u6587\u4ef6\uff0c\u4f46\u4e0d\u4e00\u5b9a\u5237\u65b0\u5230\u78c1\u76d8\u4e0a\uff0c\u800c\u662f\u53d6\u51b3\u4e8e\u64cd\u4f5c\u7cfb\u7edf\u7684\u8c03\u5ea6\uff1b\n\u5f53\u53d6\u503c\u4e3a 2 \u65f6\uff0c\u6bcf\u6b21\u4e8b\u52a1\u63d0\u4ea4\u4f1a\u5199\u5165\u65e5\u5fd7\u6587\u4ef6\uff0c\u4f46\u5e76\u4e0d\u4f1a\u7acb\u5373\u5237\u5199\u5230\u78c1\u76d8\uff0c\u65e5\u5fd7\u6587\u4ef6\u4f1a\u6bcf\u79d2\u5237\u5199\u4e00\u6b21\u5230\u78c1\u76d8\u3002\u8fd9\u65f6\u5982\u679c mysqld \u8fdb\u7a0b\u5d29\u6e83\uff0c\u7531\u4e8e\u65e5\u5fd7\u5df2\u7ecf\u5199\u5165\u5230\u7cfb\u7edf\u7f13\u5b58\uff0c\u6240\u4ee5\u5e76\u4e0d\u4f1a\u4e22\u5931\u6570\u636e\uff1b\u5728\u64cd\u4f5c\u7cfb\u7edf\u5d29\u6e83\u7684\u60c5\u51b5\u4e0b\uff0c\u901a\u5e38\u4f1a\u5bfc\u81f4\u6700\u540e 1s \u7684\u65e5\u5fd7\u4e22\u5931\u3002\n\u4e0a\u9762\u8bf4\u5230\u7684\u300c\u6700\u540e 1s\u300d\u5e76\u4e0d\u662f\u7edd\u5bf9\u7684\uff0c\u6709\u7684\u65f6\u5019\u4f1a\u4e22\u5931 \u66f4\u591a\u6570\u636e\u3002\u6709\u65f6\u5019\u7531\u4e8e\u8c03\u5ea6\u7684\u95ee\u9898\uff0c\u6bcf\u79d2\u5237\u5199\uff08once-per-second flushing\uff09\u5e76\u4e0d\u80fd\u4fdd\u8bc1 100% \u6267\u884c\u3002\u5bf9\u4e8e\u4e00\u4e9b\u6570\u636e\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u8981\u6c42\u4e0d\u9ad8\u7684\u5e94\u7528\uff0c\u914d\u7f6e\u4e3a 2 \u5c31\u8db3\u591f\u4e86\uff1b\u5982\u679c\u4e3a\u4e86\u6700\u9ad8\u6027\u80fd\uff0c\u53ef\u4ee5\u8bbe\u7f6e\u4e3a 0\u3002\u6709\u4e9b\u5e94\u7528\uff0c\u5982\u652f\u4ed8\u670d\u52a1\uff0c\u5bf9\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u8981\u6c42\u5f88\u9ad8\uff0c\u6240\u4ee5\u5373\u4f7f\u6700\u6162\uff0c\u4e5f\u6700\u597d\u8bbe\u7f6e\u4e3a 1.\n\u5f53\u6211\u4eec\u8bbe\u7f6e\u4e3a2 \u7684\u65f6\u5019\uff0cLog Thread \u4f1a\u5728\u6211\u4eec\u6bcf\u6b21\u4e8b\u52a1\u7ed3\u675f\u7684\u65f6\u5019\u5c06\u6570\u636e\u5199\u5165\u4e8b\u52a1\u65e5\u5fd7\uff0c\u4f46\u662f\u8fd9\u91cc\u7684\u5199\u5165\u4ec5\u4ec5\u662f\u8c03\u7528\u4e86\u6587\u4ef6\u7cfb\u7edf\u7684\u6587\u4ef6\u5199\u5165\u64cd\u4f5c\u3002\u800c\u6211\u4eec\u7684\u6587\u4ef6\u7cfb\u7edf\u90fd\u662f\u6709\u7f13\u5b58\u673a\u5236\u7684\uff0c\u6240\u4ee5Log Thread \u7684\u8fd9\u4e2a\u5199\u5165\u5e76\u4e0d\u80fd\u4fdd\u8bc1\u5185\u5bb9\u771f\u7684\u5df2\u7ecf\u5199\u5165\u5230\u7269\u7406\u78c1\u76d8\u4e0a\u9762\u5b8c\u6210\u6301\u4e45\u5316\u7684\u52a8\u4f5c\u3002\u6587\u4ef6\u7cfb\u7edf\u4ec0\u4e48\u65f6\u5019\u4f1a\u5c06\u7f13\u5b58\u4e2d\u7684\u8fd9\u4e2a\u6570\u636e\u540c\u6b65\u5230\u7269\u7406\u78c1\u76d8\u6587\u4ef6Log Thread \u5c31\u5b8c\u5168\u4e0d\u77e5\u9053\u4e86\u3002\u6240\u4ee5\uff0c\u5f53\u8bbe\u7f6e\u4e3a2 \u7684\u65f6\u5019\uff0cMySQL Crash \u5e76\u4e0d\u4f1a\u9020\u6210\u6570\u636e\u7684\u4e22\u5931\uff0c\u4f46\u662fOS Crash \u6216\u8005\u662f\u4e3b\u673a\u65ad\u7535\u540e\u53ef\u80fd\u4e22\u5931\u7684\u6570\u636e\u91cf\u5c31\u5b8c\u5168\u63a7\u5236\u5728\u6587\u4ef6\u7cfb\u7edf\u4e0a\u4e86\u3002\u5404\u79cd\u6587\u4ef6\u7cfb\u7edf\u5bf9\u4e8e\u81ea\u5df1\u7f13\u5b58\u7684\u5237\u65b0\u673a\u5236\u5404\u4e0d\u4e00\u6837\uff0c\u5927\u5bb6\u53ef\u4ee5\u81ea\u884c\u53c2\u9605\u76f8\u5173\u7684\u624b\u518c\u3002\n\nsync_binlog = \u00a0N\uff1a\n\nN>0 \u00a0 \u00a0\u6bcf\u5411\u4e8c\u8fdb\u5236\u65e5\u5fd7\u6587\u4ef6\u5199\u5165N\u6761SQL\u6216N\u4e2a\u4e8b\u52a1\u540e\uff0c\u5219\u628a\u4e8c\u8fdb\u5236\u65e5\u5fd7\u6587\u4ef6\u7684\u6570\u636e\u5237\u65b0\u5230\u78c1\u76d8\u4e0a\uff1b\nN=0 \u00a0 \u00a0\u4e0d\u4e3b\u52a8\u5237\u65b0\u4e8c\u8fdb\u5236\u65e5\u5fd7\u6587\u4ef6\u7684\u6570\u636e\u5230\u78c1\u76d8\u4e0a\uff0c\u800c\u662f\u7531\u64cd\u4f5c\u7cfb\u7edf\u51b3\u5b9a\uff1b\n\n\u63a8\u8350\u914d\u7f6e\u7ec4\u5408\uff1a\n\nN=1,1 \u00a0\u2014 \u9002\u5408\u6570\u636e\u5b89\u5168\u6027\u8981\u6c42\u975e\u5e38\u9ad8\uff0c\u800c\u4e14\u78c1\u76d8IO\u5199\u80fd\u529b\u8db3\u591f\u652f\u6301\u4e1a\u52a1\uff0c\u6bd4\u5982\u5145\u503c\u6d88\u8d39\u7cfb\u7edf\uff1b\nN=1,0 \u00a0\u2014 \u9002\u5408\u6570\u636e\u5b89\u5168\u6027\u8981\u6c42\u9ad8\uff0c\u78c1\u76d8IO\u5199\u80fd\u529b\u652f\u6301\u4e1a\u52a1\u4e0d\u5bcc\u4f59\uff0c\u5141\u8bb8\u5907\u5e93\u843d\u540e\u6216\u65e0\u590d\u5236\uff1b\nN=2,0\u62162,m(01 ) innodb_flush_log_at_trx_commit=2 \u65f6\uff0c(\u5728\u5f53\u524d\u6a21\u5f0f\u4e0b)MySQL\u7684\u5199\u64cd\u4f5c\u624d\u80fd\u8fbe\u5230\u6700\u9ad8\u6027\u80fd\u3002\n\n\u6570\u636e\u5b89\u5168\u6027\n\n\u5f53innodb_flush_log_at_trx_commit\u548csync_binlog \u00a0\u90fd\u4e3a1\u65f6\u662f\u6700\u5b89\u5168\u7684\uff0c\u5728mysqld \u670d\u52a1\u5d29\u6e83\u6216\u8005\u670d\u52a1\u5668\u4e3b\u673acrash\u7684\u60c5\u51b5\u4e0b\uff0cbinary log \u53ea\u6709\u53ef\u80fd\u4e22\u5931\u6700\u591a\u4e00\u4e2a\u8bed\u53e5\u6216\u8005\u4e00\u4e2a\u4e8b\u52a1\u3002\u4f46\u662f\u9c7c\u4e0e\u718a\u638c\u4e0d\u53ef\u517c\u5f97\uff0c\u90fd\u4e3a1\u4f1a\u5bfc\u81f4\u9891\u7e41\u7684IO\u64cd\u4f5c\uff0c\u56e0\u6b64\u8be5\u6a21\u5f0f\u4e5f\u662f\u6700\u6162\u7684\u4e00\u79cd\u65b9\u5f0f\u3002\n\u5f53innodb_flush_log_at_trx_commit\u8bbe\u7f6e\u4e3a0\uff0cmysqld\u8fdb\u7a0b\u7684\u5d29\u6e83\u4f1a\u5bfc\u81f4\u4e0a\u4e00\u79d2\u949f\u6240\u6709\u4e8b\u52a1\u6570\u636e\u7684\u4e22\u5931\u3002\n\u5f53innodb_flush_log_at_trx_commit\u8bbe\u7f6e\u4e3a2\uff0c\u53ea\u6709\u5728\u64cd\u4f5c\u7cfb\u7edf\u5d29\u6e83\u6216\u8005\u7cfb\u7edf\u6389\u7535\u7684\u60c5\u51b5\u4e0b\uff0c\u4e0a\u4e00\u79d2\u949f\u6240\u6709\u4e8b\u52a1\u6570\u636e\u624d\u53ef\u80fd\u4e22\u5931\u3002\n\n\u53cc1\u9002\u5408\u6570\u636e\u5b89\u5168\u6027\u8981\u6c42\u975e\u5e38\u9ad8\uff0c\u800c\u4e14\u78c1\u76d8IO\u5199\u80fd\u529b\u8db3\u591f\u652f\u6301\u4e1a\u52a1\uff0c\u6bd4\u5982\u8ba2\u5355,\u4ea4\u6613,\u5145\u503c,\u652f\u4ed8\u6d88\u8d39\u7cfb\u7edf\u3002\u53cc1\u6a21\u5f0f\u4e0b\uff0c\u5f53\u78c1\u76d8IO\u65e0\u6cd5\u6ee1\u8db3\u4e1a\u52a1\u9700\u6c42\u65f6\uff0c\u63a8\u8350\u7684\u505a\u6cd5\u662finnodb_flush_log_at_trx_commit=2 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