Hi All, When i am executing one package specification in SQL Developer It is taking long time to execute and after that throws below error. Error report: ORA-04021: timeout occurred while waiting to lock object 04021. 00000 - "timeout occurred while waiting to lock object %s%s%s%s%s" *Cause: While waiting to lock a library object, a timeout is occurred. *Action: Retry the operation later. What is this?