How to fix the Oracle error ORA-30029: no active undo tablespace assigned to instance?

In this post, you’ll learn more about the Oracle ErrorORA-30029: no active undo tablespace assigned to instance with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-30029: no active undo tablespace assigned to instance

Reason for the Error ORA-30029: no active undo tablespace assigned to instance

the current instance does not have an active undo tablespace assigned to execute transactions.

How to fix the Error ORA-30029: no active undo tablespace assigned to instance ?

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

ask DBA to create an undo tablespace, online the undo tablespace and then retry operation.