How to fix the Oracle error ORA-27421: calendar expression restriction string encountered?

In this post, you’ll learn more about the Oracle ErrorORA-27421: calendar expression restriction string encountered with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-27421: calendar expression restriction string encountered

Reason for the Error ORA-27421: calendar expression restriction string encountered

The calendar expression was not valid because a limit test failed. For example, the maximum value of the interval that can be specified in the INTERVAL clause is limited to a value derived from the frequency clause.

How to fix the Error ORA-27421: calendar expression restriction string encountered ?

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

Specify a valid calendar definition.