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hey guys i have a few questions regarding my website that has the use of multiple databases....at the moment my site is ran off one mysqli connection and before executing a query i change the database depending on if its my authentication script, geoip, framework etc.

 

what i'm worried about is performance issues....i could have a new connection for each database or continue to have one connection for the whole site and change database when needed...what is the best practice please?

 

thank you.

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https://forums.phpfreaks.com/topic/297708-website-with-multiple-databases/
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The connection is to the server so if the databases are on the same server then a single connection is sufficient. You can, if you want, mix databases in a single query if on the same server

SELECT ...
FROM database1.tableA as a
INNER JOIN database2.tableB as b
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