I wouldn't go too crazy on it. The normal database usage, even for a large instance isn't huge. The SQL calls are generally pretty well optimized. Without knowing your expected growth and usage, it's a bit difficult to get too precise, but I think you should be safe for a while with the following:
Most people run on MySQL or Postgres with a fairly basic configuration, so there really isn't a need for massive scale.
If you really want to warm up the database, the two most expensive operations that Jira does are reindexing and the XML backup. If you have a lot of data in your instance, doing either of those will put some good load on the DB.
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