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多选题
You started a long transaction. Before committing， you executed a query on one of the tables currently being modified. You received the following error： ORA-01555： snapshot too old How would you prevent such an error in the future？（）
A
guarantee undo retention
B
add one more redo log group
C
size the redo log files appropriately
D
size the UNDO tablespace appropriately
E
size the SYSTEM tablespace appropriately
F
configure an appropriate undo retention interval
G
change automatic undo management to manual
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