优化mysql slave的同步速度

zhgc

两个参数会影响速度

mysql> set global sync_binlog=20 ;
Query OK, 0 rows affected (0.00 sec)

mysql> set global innodb_flush_log_at_trx_commit=2;
Query OK, 0 rows affected (0.00 sec)

innodb_flush_log_at_trx_commit默认为1.   调为0后，速度提升很明显

由于没有用到binlog, 所有还没有测试sync_binlog。而且sync_binlog数据默认已经是0了

# If set to 1, InnoDB will flush (fsync) the transaction logs to the

# disk at each commit, which offers full ACID behavior. If you are

# willing to compromise this safety, and you are running small

# transactions, you may set this to 0 or 2 to reduce disk I/O to the

# logs. Value 0 means that the log is only written to the log file and

# the log file flushed to disk approximately once per second. Value 2

# means the log is written to the log file at each commit, but the log

# file is only flushed to disk approximately once per second.

innodb_flush_log_at_trx_commit=0