How to fix the Oracle error ORA-30015: previously offlined undo tablespace ‘string’ is still pending?

In this post, you’ll learn more about the Oracle ErrorORA-30015: previously offlined undo tablespace ‘string’ is still pending with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-30015: previously offlined undo tablespace ‘string’ is still pending

Reason for the Error ORA-30015: previously offlined undo tablespace ‘string’ is still pending

the current operation is not allowed because an undo tablespace containing active transactions is pending from a previous SWITCH UNDO operation. The operation will be allowed again after all transactions in the previous undo tablespace are committed.

How to fix the Error ORA-30015: previously offlined undo tablespace ‘string’ is still pending ?

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

Wait for all previous transactions to commit before reissuing the current statement.