We have a table with 54 million records. Here is the table structure. CREATE TABLE `metaplay` ( `track_id` int(11) NOT NULL DEFAULT '0', `user_id` int(11) DEFAULT NULL, `completed` int(11) ...
In a project, we need to frequently ALTER the tables to delete or add columns. I wonder if this weakens the database performance in long term. If it has a considerable negative impact, what is the ...
On each page of my websites 2 or 3 permissions have to be checked and I use role-permission model. Which one is better? to check permissions of each user always through database directly or once ...