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Status Not under consideration
Workspace Db2
Created by Guest
Created on Mar 17, 2017

The option ordinality is used in XML queries but the overall performance is very slow

We use the for ordinality option in our queries but the over all performance is very poor.
There is a specific XSCAN needed when ordinality is specified which takes a long time.

this XSCAN produces a sequence of XML ELEMENTS. This sequence is then fed into XUNNEST. The XUNNEST function pulls out elements from the sequence and numbers them. This is where we are getting the numbers for ordinality. These "unnested" elements are then fed into the second XSCAN. The second XSCAN traverses to /TradingTime/TradingTime and is then joined with the sequence number that we found from the XUNNEST function.