多选题Which three descriptions are correct about the effects of the TRUNCATE command on a table（）AThe corresponding indexes for the table are also truncated.BDelete triggers on the table are fired during the execution of the TRUNCATE command.CThe child table

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多选题

Which three descriptions are correct about the effects of the TRUNCATE command on a table（）

The corresponding indexes for the table are also truncated.

Delete triggers on the table are fired during the execution of the TRUNCATE command.

The child table is truncated when the TRUNCATE command is applied on the parent table.

The high-water mark （HWM） is set to point to the first usable data block in the table segment.

No undo or very little undo data is generated during the execution of the TRUNCATE command

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多选题Which three descriptions are correct about the effects of the TRUNCATE command on a table（）AThe corresponding indexes for the table are also truncated.BDelete triggers on the table are fired during the execution of the TRUNCATE command.CThe child table is truncated when the TRUNCATE command is applied on the parent table.DThe high-water mark （HWM） is set to point to the first usable data block in the table segment.ENo undo or very little undo data is generated during the execution of the TRUNCATE command

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第2题

多选题Evaluate the SQL statement:TRUNCATE TABLE DEPT;Which three are true about the SQL statement? （）AIt releases the storage space used by the table.BIt does not release the storage space used by the table.CYou can roll back the deletion of rows after the statement executes.DYou can NOT roll back the deletion of rows after the statement executes.EAn attempt to use DESCRIBE on the DEPT table after the TRUNCATE statement executes will display an error.FYou must be the owner of the table or have DELETE ANY TABLE system privileges to truncate the DEPT table

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第3题

单选题You executed the following SQL statement to shrink the EMPLOYEES table segment stored in the EXAMPLE tablespace: ALTER TABLE employees SHRINK SPACE CASCADE; Which statement is correct in this scenario?（）A The EMPLOYEES table will be changed to read-only mode during the shrink operation.B The indexes created on the EMPLOYEES table will need to be rebuilt after the shrink operation is over.C The shrink behavior will be cascaded to all dependent segments of the table that support a shrink operation.D Data manipulation language (DML) operations will not be possible on the EMPLOYEES table during the COMPACTION phase of the shrink operation.

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第4题

多选题关于Truncate table, 以下（）描述是错误的。ATruncate table 可跟Where从句，根据条件进行删除BTruncate table 用来删除表中所有数据C触发器对Truncate table无效Ddelete 比Truncate table速度快

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第5题

多选题Which statements are correct regarding indexes？（）AWhen a table is dropped， the corresponding indexes are automatically dropped.BFor each DML operation performed， the corresponding indexes are automatically updated.CIndexes should be created on columns that are frequently referenced as part of an expression.DA non-deferrable PRIMARY KEY or UNIQUE KEY constraint in a table automatically creates a uniqueindex.

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第6题

多选题You execute this command to drop the ITEM table， which has the primary key referred in the ORDERS table：SQL> DROP TABLE scott.item CASCADE CONSTRAINTS PURGE； Which two statements are true about theeffect of the command（）ANo flashback is possible to bring back the ITEM table.BThe ORDERS table is dropped along with the ITEM table.CThe dependent referential integrity constraints in the ORDERS table are disabled.DThe dependent referential integrity constraints in the ORDERS table are removed.EThe table definition of the ITEM table and associated indexes are placed in the recycle bin

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第7题

单选题Which statement is correct about the forwarding table?（）A The forwarding table is stored only on the PFEB The forwarding table contains all known routesC The forwarding table is stored on both the RE and PFED The forwarding table is stored only on the RE

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多选题Which three descriptions are correct about the effects of the TRUNCATE command on a table（）AThe corresponding indexes for the table are also truncated.BDelete triggers on the table are fired during the execution of the TRUNCATE command.CThe child table

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