I'm using php and the exec() function to run 2 MySQL script files one after another
The first file has approx 2k update statements (see below) in and is 114kb in size.
UPDATE table1 SET is_active = 1 WHERE id = 43;
The second has approx 15k update statements (see below) in and is 817kb in size.
UPDATE table2 SET is_active = 1 WHERE id = 12345;
The id column in table1 and table2 is a primary key so I would've thought this should be quite a quick update.
When I watch the MySQL Workbench dashboard for number of updates per second the first file runs at approx 80/s and the second 5k/s.
This means the smaller file with less updates is running much slower than the larger one.
Does anybody know if there is a logical reason for this?
Best Answer
I've realised that using an alternative query structure helps to speed this up.
Works much quicker and reduces the script file size to 11kb from 114kb and also reduces running time from 40 secs to just under 2 secs