If you are getting “Fatal error: Allowed memory size of xxxxxxxx bytes exhausted” error message in your wordpress then just increase php memory limit.
To increase PHP memory limit
1.Open your wp-config.php file.
2.Add below code in a new line
define('WP_MEMORY_LIMIT', '64M');
and save the changes
replace 64 with your required limit
Note :
1.This setting increases PHP Memory only for WordPress, not other applications.
2.This setting may not work if your host does not allow for increasing the wordpress PHP memory limit.