單項(xiàng)選擇題

You executed this command to create a temporary table：
SQL> CREATE GLOBAL TEMPORARY TABLE report_work_area （startdate DATE， enddate DATE， class CHAR（20））ON COMMIT PRESERVE ROWS；
Which statement is true about the rows inserted into the REPORT_WORK_AREA table during atransaction （）

A.The rows stay in the table only until session termination.
B.The rows stay in the table only until the next transaction starts on the table.
C.The rows are visible to all current sessions after the transaction is committed.
D.The rows stay available for subsequent sessions after the transaction is committed

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多項(xiàng)選擇題

Which two statements are true regarding B-tree index（）

A.The leaf blocks in the index are doubly linked.
B.The leaf node stores a bitmap for each key value.
C.The rows with NULL value in key columns also have entries in the index.
D.The deletion of a row from the table causes a logical deletion in index leaf block and the space becomes available for the new leaf entry.

單項(xiàng)選擇題

Which statement describes the effect on an index， when the indexed column for the rows is updatedin the base table（）

A.An update in a leaf row takes place.
B.The index becomes invalid after the update.
C.The leaf block containing the row to be updated is marked as invalid.
D.A row in the leaf block of the index for the key value is logically deleted and a new leaf row is inserted

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你可能感興趣的試題

Which two statements are true regarding B-tree index（）

Which statement describes the effect on an index， when the indexed column for the rows is updatedin the base table（）

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Which statement describes the effect on an index， when the indexed column for the rows is updatedin the base table（）