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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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出自：Oracle认证

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