CF - QoQ vs Query

Question

I\'ve got a notion that calling a query of queries is faster than a query from database, because the slowdown is in the communication between cf and the db. Is this true.

Answer 1

Times to use QofQ

• When you have two datasources and for various reasons you can use linked servers
• When the data comes in via WDDX or JSON and you have to do a join
• When it is practical to store data in a cached query and do QofQ against the cached query
• When you have to join the result of a directoryList() against a data base

Times to not use QofQ

• When you can load the data into a struct instead
• When doing doing a massive number of iterations
• When the one of source data sets is very large
• When you need to do a left, right, or outer join

For more details see

http://help.adobe.com/en_US/ColdFusion/9.0/Developing/WSc3ff6d0ea77859461172e0811cbec0e4fd-7ff0.html

This is for CF 9 but QofQ has been about the same since CF 6