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SELECT query running very slow in PHYSICAL STANDBY database after upgrade from Oracle 12.1 to Oracl

edited Feb 18, 2020 12:38AM in Database Tuning (MOSC) 4 commentsAnswered

Hi,
We have got a PHYSICAL STANDBY database in Oracle 12.2. During business hour, we stop the sync process( with PRIMARY database) and open(READ ONLY) the STANDBY database for crucial reporting activities.
The SELECT queries are running terribly slow STANDBY database. The SELECT query that returns result in seconds in PRIMARY database but take 20 minutes or more in STANDBY database, even in many cases it never returns the result.
The same PHYSICAL STANDBY database performed quite well and same as PRIMARY DATABASE while running in Oracle 12.1.
We are facing the performance issue since we upgraded the database system from Oracle 12.1 to Oracle 12.2 recently

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