wp-db.php on line 958 error and wp_memory_limit

I got error message when I try to access Stats menu from my dashboard.

Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 79 bytes) in /home/hosting/public_html/mydomain.net/wp-includes/wp-db.php on line 958

It seem I have memory limitation and need to reconfigure first some point in my wordpress.

Configure WordPress Memory Limit

Add this line in wp-config.php

define('WP_MEMORY_LIMIT', '64M');

Try again and I have no luck. Still same error.

Move the blog with sub domain in my vps account and set the limit to 384 give me great result.

The problem is 64M already place as highest memory value I can use  as I stand in shared host.

Investigate WordPress database data

wp-db.php related to database and that clue give me hint to phpmyadmin and see the status :

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