How to Disable SELinux

Temporarily switch off enforcement
You can switch the system into permissive mode with the following command:

echo 0 >/selinux/enforce

more info:
 http://www.crypt.gen.nz/selinux/disable_selinux.html#DIS2

Finding out largest tables on MySQL Server

http://www.mysqlperformanceblog.com/2008/02/04/finding-out-largest-tables-on-mysql-server/

SELECT CONCAT(table_schema, '.', table_name),CONCAT(ROUND(table_rows / 1000000, 2),

       'M')rows,CONCAT(ROUND(data_length / ( 1024 * 1024 * 1024 ), 2),'G')DATA,

       CONCAT(ROUND(index_length / ( 1024 * 1024 * 1024 ), 2), 'G')idx,

       CONCAT(ROUND(( data_length + index_length ) / ( 1024 * 1024 * 1024 ), 2), 'G')

       total_size,ROUND(index_length / data_length, 2)idxfrac
FROM   information_schema.TABLES
ORDER  BY data_length + index_length DESC
LIMIT  10;