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Editorial Team
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Asked: 2026-06-04T03:41:42+00:00

I need to check for updates on a (max) one second interval for updates.

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I need to check for updates on a (max) one second interval for updates.

I’m now looking for the fastest way to do that using AJAX for the requests and PHP and MySQL.

Solution 1
Every time new data, that needs to be retreived by other clients, is added to the MySQL database a file.txt is updated with 1. AJAX makes a request to a PHP file which will check if file.txt contains a 1 or 0. If it contains a 1 it will get the data from the MySQL database and return it to the client.

Solution 2
Every AJAX request calls a PHP file which will check directly into MySQL database for new data.

Solution ..?
If there is any faster solution i’d be happy to know! (considering I can only use PHP/MySQL and AJAX)

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1 Answer

  1. Editorial Team

    Avoiding the database will probably not make the process significantly faster, if at all.

    You can use a comet-style ajax request to get near real-time polling. Basically, create an ajax request as usual to a php-script, but on the server side you poll the database and sleep for a short interval if there is nothing new. Repeat until there is something of interest for the client. If nothing appears within a timeframe of e.g. 60 seconds, close the connection down. On the client side, you only open a new connection once the first has terminated (either with a response or as a timeout).

    See: https://en.wikipedia.org/wiki/Comet_(programming)

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