Delete Orphaned Usermeta..
After using SQL to bulk-delete users, you’ll be left with (potentially a lot) of orphaned records in the “usermeta” table. You don’t want that. It’ll just waste space and clog things up.
After deleting 1000 user records, I had 20000 orphaned usermeta records – you get the picture..
From PLESK web admin, or similar:
delete FROM wp_usermeta WHERE user_id NOT IN (
SELECT ID
FROM wp_users
);
** BACK UP YOUR DATABASE FIRST!
Please note: You should NEVER leave your tables with the default “wp_” prefix. Or have a user called “admin”, or a user with id=1. That’s just for start!
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