How to fix the Oracle error QSM-01204: query rewrite not possible before view merging?

In this post, you’ll learn more about the Oracle ErrorQSM-01204: query rewrite not possible before view merging with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

QSM-01204: query rewrite not possible before view merging

Reason for the Error QSM-01204: query rewrite not possible before view merging

Internal session parameter _QUERY_REWRITE_2 is set to FALSE

How to fix the Error QSM-01204: query rewrite not possible before view merging ?

You can fix this error in Oracle by following the below steps

Change session parameter with ALTER SESSION command.