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UNDO tablespace increasing and not release space

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UNDO tablespace increasing/growing and not release space Applies to:  Oracle Database 10gR2 Description: Undo tablespace start growing abnormally. UNDO_RETENTION parameter is set to 900 seconds, but undo data did not release the space. After doing some research work, I found the following solution: Solution: Set the following hidden parameter in init.ora file and check the free space in undo tablespace after 3-4 Hrs. _smu_debug_mode=33554432 or SQL> Alter system set "_smu_debug_mode" = 33554432; Related Oracle Errors ORA-01194 Error Fix in Oracle ORA-01555 Snapshot Too Old – Solution ORA-01017 Invalid Username Password – Fix ORA-12541 TNS No Listener – Solution 👉 Check our complete guide: Oracle Error Codes Guide Author Box About the Author Rana Abdul Wahid  is an experienced Oracle Database Administrator with expertise in Oracle Database Administration, Oracle Data Guard, RMAN Backup & Recovery, Oracle RAC, Oracle E-Bu...
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