PARALLELISM is a close friend of DBA where you get to see it as a common occurence in the multi-processor server environment and during such performance issues you can also investigate whether a parallel plan is in use. For instance If a particular query is slow when it is using a parallel plan, you can try forcing a non-parallel plan by using the ...

This was the question asked by a Developer when we are investigating a performance loss issues on a database. To the point a derived table means a virtual table that's calculated on the fly from a select statement. By default using derived tables can be tremendously useful in certain situations. In any case if you have 2 queries in hand say one ...