167.Which three descriptions are correct about the effects of the TRUNCATE command on a table? (Choo
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167.Which three descriptions are correct about the effects of the TRUNCATE command on a table?
(Choose three.)
A.The corresponding indexes for the table are also truncated.
B.Delete triggers on the table are fired during the execution of the TRUNCATE command.
C.The child table is truncated when the TRUNCATE command is applied on the parent table.
D.The high-water mark (HWM) is set to point to the first usable data block in the table segment.
E.No undo or very little undo data is generated during the execution of the TRUNCATE command.
答案：ADE
解析：truncate表后对应的索引也会删除掉，不会产生还原数据，不触发触发器，如果被一个外键所应用不能截断，并且会重置hwm
(Choose three.)
A.The corresponding indexes for the table are also truncated.
B.Delete triggers on the table are fired during the execution of the TRUNCATE command.
C.The child table is truncated when the TRUNCATE command is applied on the parent table.
D.The high-water mark (HWM) is set to point to the first usable data block in the table segment.
E.No undo or very little undo data is generated during the execution of the TRUNCATE command.
答案：ADE
解析：truncate表后对应的索引也会删除掉，不会产生还原数据，不触发触发器，如果被一个外键所应用不能截断，并且会重置hwm
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