Is Ajax SQL query depending on server ?

A PHP webpage is calling an AJAX script (querying DB) in pending. I had to stop it because it was called 2 hours ago. Whereas I tested it on another DigitalOcean server and it responded in 2 minutes.

The servers are similar (16GB RAM, 8CPU, etc…)

And the there is not much traffic.

I really don’t understand. The only differences I noticed are the servers are : MySQL versions and Ubuntu versions.

The 1st server : MySQL Server version: 5.5.52-0ubuntu0.14.04.1 (Ubuntu 14.04.2 LTS). And the 2nd one : MySQL Server version: 5.7.13-0ubuntu0.16.04.2 (Ubuntu 16.04 LTS).

The tables got the same indexes on the same tables that are queried.

Still, I don’t get where is the problem ?

Maybe from the SQL query ?

(P.S. : the SQL query works on our 2nd server)

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Can you share some details on the page initiating the query or share the PHP function processing it? It’s possible with those times (2 minutes or more) you are hitting a timeout somewhere that is causing it to fail to return. If that’s the case it may just require a configuration adjustment. If your query is taking 2 minutes or more you may also want to look into whether you can optimize your table structure or indexes to improve performance as that is quite slow.