The following is the ORA-23409 error message, you can learn the cause and solution of the Oracle database error.
ORA-23409 could not find an unused refresh group number
Cause: 1000 consecutive refresh group numbers, as defined by the RGROUPSEQ number, were already used by rows in SYS.RGROUP$.
Solution: Alter the sequence number to be within a legal unused range and destroy unneeded refresh groups.
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