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I have program that constantly query a mysql server. Each time I access the server I made a connection then query it. I wonder if I can actually save time by reuse the same connection and only reconnect when the connection is closed. Given that I can fit many of my queries within the duration of connection timeout and my program has only one thread.
Yes by all means, re-use the connection!
If you are also doing updates/delete/inserts through that connection make sure you commit (or rollback) you transactions properly so that once you are “done” with the connection, it is left in a clean state.
Another option would be to use a connection pooler.