Hello,
In several places in IQ documentation we see this note
Note: CIS functional compensation performance considerations apply.
Recently we had the following incident on IQ 15.4, a complex query using derived tables had isnumeric() in one of the columns of a derived table. The select command returned around 60000 rows in less than a minute but insert using the select lasted almost 3 hours. When isnumeric() was removed insert lasted less than 5 minutes. We suspect the above note is related to this behavior, it seems that isnumeric is parsed by SQL anywhere engine and not IQ engine and this causes a delay. In general this is a known issue but until now we never had such an extreme case (5 min compared to 3 hours for the same command).
Is there somewhere a list of the commands, functions etc that may have similar problems? Maybe a document describing what is processed by SQL Anywhere and what from IQ. I suppose there is no solution or workaround for this, so it would be important to know how to avoid it
Thank you in advance, any feedback could be valuable.
Kimon Moschandreou