mysql replication 修改库名

--replicate-rewrite-db=from_name->to_name
Command-Line Format --replicate-rewrite-db=old_name->new_name
Option-File Format replicate-rewrite-db
  Permitted Values
Type string
Tells the slave to translate the default database (that is, the one selected by  USE) to  to_name if it was  from_name on the master. Only statements involving tables are affected (not statements such as  CREATE DATABASE,  DROP DATABASE, and  ALTER DATABASE), and only if  from_name is the default database on the master. This does not work for cross-database updates. To specify multiple rewrites, use this option multiple times. The server uses the first one with a  from_name value that matches. The database name translation is done  before the  --replicate-* rules are tested.
If you use this option on the command line and the “ >” character is special to your command interpreter, quote the option value. For example:
shell>  mysqld --replicate-rewrite-db="olddb->newdb"
 
适用情况：
比如，master与slave同步test这个库，但因为需要slave需要将test改名为testbak，master不能改，就需要这个参数
在my.cnf中加入
binlog-do-db=test
replicate-rewrite-db=test->testbak
 重启mysql，在master的test库修改东西，看slave的hackers库是否已经修改。查看show slave status是否正常。
 
总结一下：slave修改库名，master不变的情况下
 
 
题外话：在遇到slave query 同步错误时，可以使用如下方法解决：
slave stop;
set global sql_slave_skip_counter=1;
slave start;
不过有可能会丢失数据。先看清楚是因为什么导致的错误。