Updating servers at once in web cluster

I don’t think the database schema ever changes so drastically that the versions of wordpress on box 2 + 3 would be prevented from reading from the DB after you’ve updated on box 1, however it depends what version you are upgrading from. Why not set a similar environment locally and test upgrading site 1, … Read more

What files to keep after upgrading WordPress?

Delete everything but wp-content and wp-config.php, copy the fresh installation into the directory. On upgrading WordPress will use the database to see what should be done, not the files. Not all files are deleted automatically, because some of them might still be used by outdated plugins or external scripts (the old feed files are good … Read more

Which database table does “Featured images” save under?

The featured image itself– the actual .jpg, or .png, most likely– is saved to wp-content/uploads with primary image data saved to $wpdb->posts as an attachment post type. Additional relevant data for the image is saved in $wpdb->postmeta. What makes an image “featured” or not is an entry in $wpdb->postmeta under the key _thumbnail_id and a … Read more

Empty space instead of admin bar

you are correct, that is for the admin bar. add this code to functions.php to disable the admin bar if you wish <?php /* Disable the Admin Bar. */ remove_action( ‘init’, ‘wp_admin_bar_init’ ); ?> if you want to use it then check your source for <div id=”wpadminbar”> <div class=”quicklinks”> If so, then the output is … Read more