The screen turns white once I add over 4000 pages.

[Lyncis]

Dear Sirs! While attempting to post over 4000 pages using wordpress, a part of admin interface dies instantly (I am talking about the part showing the list of website pages)and also the frontend goes dead. I suspect that the problems is caused by the "wp_list_pages" function, which in turn summons another function, which is "get_pages". In the line 3177 of the "get_pages" functions there is /wp-includes/post.php contains SQL call which draws all the date from the POSTS table:
$query = "SELECT * FROM $wpdb->posts $join WHERE ($where_post_type) $where ";
A part of it is in an unnecessary field, namely post_content – which I see as the cause of wordpress failure once great number of pages is added.

Related: #14777

See: http://core.trac.wordpress.org/ticket/14777#comment:11

Lyncis can you please enable error logging and WP_DEBUG? Some additional information shuld be kept in the PHP error log then. Please share.

We're not ready to push this. You'll want to just bump your memory.

Related: #15459