Best would be to see the server log which should tell what went wrong, but most likely it is simply the executing of a too large job that chrashed the execution. If the server is still available for other operations. The 503 means the server was doing its thing, but opted to abort. This could be because PHP was fine with a long execution, but MySQL timed out or refused to finish the job.
If possible, split the job up into multiple jobs and try it again in smaller chunks. If PHP can handle the time it takes, then try in a loop to make smaller request to the service (MySQL).
This kind of thing is not uncommon to occur in system that works fine sometimes, or worked for weeks, but suddenly fails.
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PHP (from the English Hypertext Preprocessor - hypertext preprocessor) is a scripting programming language for developing web applications. Supported by most hosting providers, it is one of the most popular tools for creating dynamic websites.
The PHP scripting language has gained wide popularity due to its processing speed, simplicity, cross-platform, functionality and distribution of source codes under its own license.
https://www.php.net/
DBMS is a database management system. It is designed to change, search, add and delete information in the database. There are many DBMSs designed for similar purposes with different features. One of the most popular is MySQL.
It is a software tool designed to work with relational SQL databases. It is easy to learn even for site owners who are not professional programmers or administrators. MySQL DBMS also allows you to export and import data, which is convenient when moving large amounts of information.
https://www.mysql.com/
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