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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。
