My site that is plugin heavy with Woocommerce and Ultimate Member is often eating ALL 1000MB of memory when there is limited traffic.
I suspect the massive amount of errors in the error_log file could be a clue.
90% of them reference a ultimate member plugin seen below.
Based on one of these errors, do you have any idea what exactly is wrong with this plugin based on this error message?
[25-Dec-2015 03:48:48 UTC] WordPress database error Column ‘url’ cannot be null for query INSERT INTO wp_um_notifications (time, user, status, photo, type, url, content) VALUES (‘2015-12-25 03:48:48’, ‘168’, ‘unread’, ‘http://mysite.com/wp-content/plugins/ultimate-member/assets/img/default_avatar.jpg’, ‘profile_view_guest’, NULL, ‘A guest has viewed your profile.’) made by require(‘wp-blog-header.php’), require_once(‘wp-includes/template-loader.php’), include(‘/themes/zerif-lite/template-fullwidth.php’), get_template_part, locate_template, load_template, require(‘/themes/zerif-lite/content-page.php’), the_content, apply_filters(‘the_content’), call_user_func_array, do_shortcode, preg_replace_callback, do_shortcode_tag, call_user_func, UM_Shortcodes->ultimatemember, UM_Shortcodes->load, UM_Shortcodes->template_load, UM_Shortcodes->load_template, include(‘/plugins/ultimate-member/templates/profile.php’), do_action(‘um_profile_content_main’), call_user_func_array, um_profile_content_main, do_action(‘um_before_profile_fields’), call_user_func_array, um_notification_log_view, UM_Notifications_Main_API->store_notification
