PHP and MySQL Web Development 4th Ed-tqw-_darksiderg

308 Chapter 12 Advanced MySQL Administration
The reason for the read lock is that you need to record the place the server is up to in
its binary log when the snapshot was taken.You can do this by executing this statement:
show master status;
You should see output similar to the following from this statement:
+----------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+----------------------+----------+--------------+------------------+
| laura-ltc-bin.000001 | 95 | | |
+----------------------+----------+--------------+------------------+
Note the File and Position; you will need this information to set up the slaves.
Now take your snapshot and unlock the tables with the following statement:
unlock tables;
If you are using InnoDB tables, the easiest way is to use the InnoDB Hot Backup tool,
available from Innobase Oy at http://www.innodb.com.This is not Free Software, so
there is a license cost involved. Alternatively, you can follow the procedure described
here and, before unlocking the tables, shut down the MySQL server and copy the entire
directory for the database you want to replicate before restarting the server and unlocking
the tables.
Setting Up the Slave or Slaves
You have two optionsfor setting up the slave or slaves. If you have taken a snapshot of
your database, begin by installing it on the slave server.
Next, run the following queries on your slave:
change master to
master-host=’server’,
master-user=’user’,
master-password=’password’,
master-log-file=’logfile’,
master-log-pos=logpos;
start slave;
You need to fill in the data shown in italics.The server is the name of the master server.
The user and password come from the GRANT statement you ran on the master server.
The logfile and logpos come from the output of the SHOW MASTER STATUS statement
you ran on the master server.
You should now be up and running.
If you did not take a snapshot, you can load the data from the master after running
the preceding query by executing the following statement:
load data from master;