【MySQL】binlog_format以及binlog事务记录分析
MySQL官方对于binlog_format参数的说明：
http://dev.mysql.com/doc/refman/5.5/en/binary-log-setting.html
binlog_format可以动态修改，官网对于动态修改主库配置时提醒谨慎操作，会导致复制关系异常。
【主库flush logs，binlog_format='STATEMENT'】
【从库flush logs，binlog_format='MIXED'】
【主库】 # at 107 #140919 14:17:50 server id 16024 end_log_pos 178 Query thread_id=13 exec_time=0 error_code=0 SET TIMESTAMP=1411107470/*!*/; BEGIN /*!*/; # at 178 #140919 14:17:50 server id 16024 end_log_pos 281 Query thread_id=13 exec_time=0 error_code=0 use jiangxu/*!*/; SET TIMESTAMP=1411107470/*!*/; delete from t1 where c1 in (50,51,52) /*!*/; # at 281 #140919 14:17:50 server id 16024 end_log_pos 353 Query thread_id=13 exec_time=0 error_code=0 SET TIMESTAMP=1411107470/*!*/; COMMIT/*!*/; 【从库】 # at 107 #140919 14:17:50 server id 16024 end_log_pos 178 Query thread_id=13 exec_time=253 error_code=0 SET TIMESTAMP=1411107470/*!*/; BEGIN /*!*/; # at 178 #140919 14:17:50 server id 16024 end_log_pos 281 Query thread_id=13 exec_time=253 error_code=0 use `jiangxu`/*!*/; SET TIMESTAMP=1411107470/*!*/; delete from t1 where c1 in (50,51,52) /*!*/; # at 281 #140919 14:17:50 server id 16024 end_log_pos 353 Query thread_id=13 exec_time=253 error_code=0 SET TIMESTAMP=1411107470/*!*/; COMMIT/*!*/;
【主库flush logs，binlog_format='MIXED'】
【从库flush logs，binlog_format='MIXED'】
【主库】 # at 107 #140919 14:28:52 server id 16024 end_log_pos 178 Query thread_id=1 exec_time=0 error_code=0 SET TIMESTAMP=1411108132/*!*/; BEGIN /*!*/; # at 178 #140919 14:28:52 server id 16024 end_log_pos 281 Query thread_id=1 exec_time=0 error_code=0 use jiangxu/*!*/; SET TIMESTAMP=1411108132/*!*/; delete from t1 where c1 in (40,41,42) /*!*/; # at 281 #140919 14:28:52 server id 16024 end_log_pos 308 Xid = 14 COMMIT/*!*/; 【从库】 # at 353 #140919 14:28:52 server id 16024 end_log_pos 412 Query thread_id=1 exec_time=253 error_code=0 SET TIMESTAMP=1411108132/*!*/; BEGIN /*!*/; # at 412 #140919 14:28:52 server id 16024 end_log_pos 515 Query thread_id=1 exec_time=253 error_code=0 SET TIMESTAMP=1411108132/*!*/; delete from t1 where c1 in (40,41,42) /*!*/; # at 515 #140919 14:28:52 server id 16024 end_log_pos 542 Xid = 25540 COMMIT/*!*/;
【主库flush logs，binlog_format='ROW'】
【从库flush logs，binlog_format='MIXED'】
【主库】 # at 107 #140919 14:41:21 server id 16024 end_log_pos 178 Query thread_id=1 exec_time=0 error_code=0 SET TIMESTAMP=1411108881/*!*/; BEGIN /*!*/; # at 178 # at 225 #140919 14:41:21 server id 16024 end_log_pos 225 Table_map: `jiangxu`.`t1` mapped to number 33 #140919 14:41:21 server id 16024 end_log_pos 275 Delete_rows: table id 33 flags: STMT_END_F ### DELETE FROM jiangxu.t1 ### WHERE ### @1=30 /* INT meta=0 nullable=0 is_null=0 */ ### @2='a' /* VARSTRING(15) meta=15 nullable=1 is_null=0 */ ### DELETE FROM jiangxu.t1 ### WHERE ### @1=31 /* INT meta=0 nullable=0 is_null=0 */ ### @2='a' /* VARSTRING(15) meta=15 nullable=1 is_null=0 */ ### DELETE FROM jiangxu.t1 ### WHERE ### @1=32 /* INT meta=0 nullable=0 is_null=0 */ ### @2='a' /* VARSTRING(15) meta=15 nullable=1 is_null=0 */ # at 275 #140919 14:41:21 server id 16024 end_log_pos 302 Xid = 13 COMMIT/*!*/; 【从库】 # at 542 #140919 14:41:21 server id 16024 end_log_pos 601 Query thread_id=1 exec_time=253 error_code=0 SET TIMESTAMP=1411108881/*!*/; BEGIN /*!*/; # at 601 # at 648 #140919 14:41:21 server id 16024 end_log_pos 648 Table_map: `jiangxu`.`t1` mapped to number 1168 #140919 14:41:21 server id 16024 end_log_pos 698 Delete_rows: table id 1168 flags: STMT_END_F ### DELETE FROM `jiangxu`.`t1` ### WHERE ### @1=30 /* INT meta=0 nullable=0 is_null=0 */ ### @2='a' /* VARSTRING(15) meta=15 nullable=1 is_null=0 */ ### DELETE FROM `jiangxu`.`t1` ### WHERE ### @1=31 /* INT meta=0 nullable=0 is_null=0 */ ### @2='a' /* VARSTRING(15) meta=15 nullable=1 is_null=0 */ ### DELETE FROM `jiangxu`.`t1` ### WHERE ### @1=32 /* INT meta=0 nullable=0 is_null=0 */ ### @2='a' /* VARSTRING(15) meta=15 nullable=1 is_null=0 */ # at 698 #140919 14:41:21 server id 16024 end_log_pos 725 Xid = 25542 COMMIT/*!*/; DELIMITER ; # End of log file ROLLBACK /* added by mysqlbinlog */; /*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;
【主库flush logs，binlog_format='MIXED'】
【从库flush logs，binlog_format='ROW'】
注意动态修改从库binlog_format因为原session是MIXED，所以需要重建复制关系线程。
【主库】 # at 554 #140919 16:44:50 server id 16024 end_log_pos 625 Query thread_id=3 exec_time=0 error_code=0 SET TIMESTAMP=1411116290/*!*/; BEGIN /*!*/; # at 625 #140919 16:44:50 server id 16024 end_log_pos 728 Query thread_id=3 exec_time=0 error_code=0 SET TIMESTAMP=1411116290/*!*/; delete from t1 where c1 in (13,14,15) /*!*/; # at 728 #140919 16:44:50 server id 16024 end_log_pos 755 Xid = 44 COMMIT/*!*/; 【从库】 # at 296 #140919 16:44:50 server id 16024 end_log_pos 355 Query thread_id=3 exec_time=253 error_code=0 SET TIMESTAMP=1411116290/*!*/; BEGIN /*!*/; # at 355 # at 402 #140919 16:44:50 server id 16024 end_log_pos 402 Table_map: `jiangxu`.`t1` mapped to number 1168 #140919 16:44:50 server id 16024 end_log_pos 452 Delete_rows: table id 1168 flags: STMT_END_F ### DELETE FROM `jiangxu`.`t1` ### WHERE ### @1=13 /* INT meta=0 nullable=0 is_null=0 */ ### @2='a' /* VARSTRING(15) meta=15 nullable=1 is_null=0 */ ### DELETE FROM `jiangxu`.`t1` ### WHERE ### @1=14 /* INT meta=0 nullable=0 is_null=0 */ ### @2='a' /* VARSTRING(15) meta=15 nullable=1 is_null=0 */ ### DELETE FROM `jiangxu`.`t1` ### WHERE ### @1=15 /* INT meta=0 nullable=0 is_null=0 */ ### @2='a' /* VARSTRING(15) meta=15 nullable=1 is_null=0 */ # at 452 #140919 16:44:50 server id 16024 end_log_pos 479 Xid = 25570 COMMIT/*!*/;
在binlog_format=MIXED时候，哪种改变会被按照ROW进行记录到binlog，参考官方说明：
http://dev.mysql.com/doc/refman/5.5/en/binary-log-mixed.html
所以看得出在MIXED的状态下基本上对于主库的DDL操作无法按照行变化进行记录。
对于行变化的日志记录磁盘IO肯定要比语句复制消耗要大，可以根据架构酌情配置。