一、binlog日志简介及设置
mysql-binlog是MySQL数据库的二进制日志，用于记录用户对数据库操作的SQL语句（(除了数据查询语句）信息。可以使用mysqlbin命令查看二进制日志的内容。
binlog的格式也有三种：STATEMENT、ROW、MIXED 。
1、STATMENT模式：基于SQL语句的复制(statement-based replication, SBR)，每一条会修改数据的sql语句会记录到binlog中。
优点：不需要记录每一条SQL语句与每行的数据变化，这样子binlog的日志也会比较少，减少了磁盘IO，提高性能。
缺点：在某些情况下会导致master-slave中的数据不一致(如sleep()函数， last_insert_id()，以及user-defined functions(udf)等会出现问题)
2、基于行的复制(row-based replication, RBR)：不记录每一条SQL语句的上下文信息，仅需记录哪条数据被修改了，修改成了什么样子了。
优点：不会出现某些特定情况下的存储过程、或function、或trigger的调用和触发无法被正确复制的问题。
缺点：会产生大量的日志，尤其是alter table的时候会让日志暴涨。
3、混合模式复制(mixed-based replication, MBR)：以上两种模式的混合使用，一般的复制使用STATEMENT模式保存binlog，对于STATEMENT模式无法复制的操作使用ROW模式保存binlog，MySQL会根据执行的SQL语句选择日志保存方式。
二、binlog配置
仅供参考
# For advice on how to change settings please see # http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html [mysqld] # Remove leading # and set to the amount of RAM for the most important data # cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%. # innodb_buffer_pool_size = 128M # Remove leading # to turn on a very important data integrity option: logging # changes to the binary log between backups. # log_bin server-id = 2 log-bin = mysql-bin sync_binlog = 1 binlog_checksum = none binlog_format = mixed auto-increment-increment = 2 auto-increment-offset = 2 slave-skip-errors = all # These are commonly set, remove the # and set as required. # basedir = ..... # datadir = ..... # port = ..... # server_id = ..... # socket = ..... character-set-server = utf8 lower_case_table_names = 1 max_connections = 3000 skip-name-resolve expire_logs_days = 15 [client] default-character-set = utf8 [mysql] default-character-set = utf8 # Remove leading # to set options mainly useful for reporting servers. # The server defaults are faster for transactions and fast SELECTs. # Adjust sizes as needed, experiment to find the optimal values. # join_buffer_size = 128M # sort_buffer_size = 2M # read_rnd_buffer_size = 2M
