MySQL log-bin=mysql-bin

[cah]

On my server under /usr/local/var, there are hundreds of mysql-bin.xxxxxx files that take up much disk space. I did some research and found the reason why MySQL creates these files is the configuration in /etc/my.cnf:

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# Replication Master Server (default)
# binary logging is required for replication
log-bin=mysql-bin

The purpose of these binary logs is to replicate from master to slave. Since I don't replicate MySQL, there's no need to have MySQL keep creating these files. I can simply comment out this line in /etc/my.cnf.

Or, if I want to keep these binary logs, I can set up a purge rule in MySQL. There are 2 ways to make it:

1. Purge themmanually from MySQL command line:

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PURGE BINARY LOGS TO 'mysql-bin.000403';
PURGE BINARY LOGS BEFORE '2008-04-02 22:46:26';

2. Set the expire_logs_days system variable to expire binary log files automatically after a given number of days.

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mysql> SET GLOBAL expire_logs_days = 7;

Or, set it up in /etc/my.cnf in [mysqld] section

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expire_logs_days = 7

Use the following command to check if the variable is properly set in system.
1. GLOBAL

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mysql> show global variables like 'expire%';
+------------------+-------+
| Variable_name    | Value |
+------------------+-------+
| expire_logs_days | 7     |
+------------------+-------+
1 row in set (0.00 sec)

2. SESSION

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mysql> show session variables like 'expire%';
+------------------+-------+
| Variable_name    | Value |
+------------------+-------+
| expire_logs_days | 7     |
+------------------+-------+
1 row in set (0.00 sec)