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A user receives the following error while executing a query： ORA/x7f01555：snapshot too old Which two options can be the solutions to avoid such errors in future？（）
A:increase the size of redo log files
B:increase the size of the undo tablespace
C:increase the size of the Database Buffer Cache
D:increase the size of the default temporary tablespace
E:enable the retention guarantee for the undo tablespace

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出自：Oracle认证

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