mysql - Read For Learn

Can I restart MySQL engine when WordPress website is live?

Yes, service mysql restart (or systemctl restart mysql on more recent versions of Linux) will carry out a graceful shutdown and restart of mysql.

Redirecting to old domain after migration website

First of all, make sure you’re domain has correct nameserver setup and you’re uploading files to correct place. When you are changing URL from database directly, here’s a checklist. The URL must be changed only from wp_options table and update only siteurl & home (basically first 2) rows. Make sure you’re setting http/https correctly. set … Read more

When WordPress Default table, Echo Success. When Plugin Table, Echo Blank

$wpdb does not contain any reference to custom tables. So the uap_banners property doesn’t exist. You need to write in the table name the say way it was written when creating the table. So in your case that would probably be (assuming you included the database prefix): $user_checks = $wpdb->get_results( ” SELECT id, name FROM … Read more

C# user_nicename and Display name blank

Improve performance by removing unnecessary database queries

Options are persistent. You can set them when you activate your theme and then just use them. There’s no need to change them when rendering any particular page unless your logic actually changes them. And doing so may cause confusion. For example, lots of changes to image and thumbnail default sizes will make your Media … Read more

Calculating a large number of MYSQL queries as customshort codes, slow

How to display data from custom table in wordpress phpmyadmin

How to check if a meta value has already been assigned to any user?

Here is an approach you could take to do this. It’s problematic if you have a large number of users, but it could be adapted in-time. do { // 1. generate your unique random number $result = rand(); // 2. check it is really unique $is_unique = count( get_users( array( ‘meta_key’ => ‘user_reference_id’, ‘meta_value’ => … Read more

pagination with ‘no_found_rows’ => true,

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