I got following error.
EXP-00008: ORACLE error 1555 encountered
ORA-01555: snapshot too old: rollback segment number 3 with name "_SYSSMU3$" too small
EXP-00000: Export terminated unsuccessfully
My current undo_retention is 2500 sec, and undo tablespace is 3G.
- Do I need to change undo_retention or undo tablespace to fix the problem?
- How big should be?
- Does undo_retention need to be changed at downtime?