[Misiur]

mysql_tquery is using a threaded query. It means that it will execute parallelly to your script, and when it's finished, it calls your callback. Inside the plugin, it checks if you've provided a callback, and if not, it will show you a message like:

Quote:

no callback specified, skipping result saving

creating no cache for that query.

Update query result is often very important (insert ... on duplicate key update), but if you don't specify a callback, there is no unnecessary information saved.