How to fix the Oracle error ORA-23409: could not find an unused refresh group number?

In this post, you’ll learn more about the Oracle ErrorORA-23409: could not find an unused refresh group number with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-23409: could not find an unused refresh group number

Reason for the Error ORA-23409: could not find an unused refresh group number

1000 consecutive refresh group numbers, as defined by the rgroupseq number, were already used by rows in sys.rgroup$.

How to fix the Error ORA-23409: could not find an unused refresh group number ?

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

Alter the sequence number to be within a legal unused range and destroy unneeded refresh groups.