How to fix the Oracle error ORA-01640: cannot make tablespace read-only with changes by in-doubt transactions?

In this post, you’ll learn more about the Oracle ErrorORA-01640: cannot make tablespace read-only with changes by in-doubt transactions with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-01640: cannot make tablespace read-only with changes by in-doubt transactions

Reason for the Error ORA-01640: cannot make tablespace read-only with changes by in-doubt transactions

An attempt was made to alter a tablespace read-only while there were changes in the tablespace made by in-doubt distributed transactions. The in-doubt transactions must commit or rollback to ensure that there is no undo for a tablespace before it can be made read-only.

How to fix the Error ORA-01640: cannot make tablespace read-only with changes by in-doubt transactions ?

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

Any in-doubt transactions that made changes to the tablespace must be resolved.