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mysqlsqlselecthealth-monitoring

Query to check if MySQL database is connected

I am wondering if there is a best practice or standard query used to check if a MySQL database is still connected?

I was originally thinking of performing a simple search in one of my tables, which will confirm if the database is still there. Just wondering if there is a better approach.

Solution

  • No need to actually select from a table. You could just do:

    select 1

    This is a very cheap query, that will error if the database is not connected. The 1 does not really matter (the important point is to not have a from clause). You could as well use select null, or select 'foo'.