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Which statement is true regarding the effect of this command on the transaction in Scott’s session（）
A:The command fails as a transaction is still pending.
B:The transaction in Scott’s session is rolled back and the tablespace becomes read-only.
C:The command waits and the user SCOTT can execute data manipulation language （DML） statements only as part of the current transaction.
D:The command hangsuntil all transactions on the objects in the tablespace commit or rollback， and then the tablespace is placed in read-only mode.

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出自：Oracle认证

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