The TRANS_SUMMARY table contains product-wise transaction details that get updated with everytransaction in the system. Each row has cumulative transaction details of a single product and everyproduct is identified by a product code， which is the primary key. 
As part of the archival process， the company wants to transfer the rows in the TRANS_SUMMARY tableto the TRANS_SUMMARY_DUP table at the end of every quarter of the year. Along with existing products，the company deals with many new products during every quarter. 
Which method is best suited for this quarterly data transfer（）

单项选择题All the database users are presently connected to the database instance and working. The HR userhas opened three database sessions and executed the following command in one of his sessions： SQL> UPDATE persons SET ccode=’U031’ WHERE ccode=’U029’； 123 rows updated.  SQL> DELETE FROM persons WHERE exp=’Y’； 3 rows deleted.  The SYS user opens a new session after HR executed the above commands.  Which sessions can seethe effect of the UPDATE and DELETE commands （）

A.all sessions of the HR user only
B.all sessions of the HR user and the SYS user
C.the session of the HR user that executed the commands
D.all the sessions for which the database users have access privilege to the PERSONS table

单项选择题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

多项选择题WhichtwostatementsaretrueregardingB-treeindex（）

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.

单项选择题Whichstatementdescribestheeffectonanindex，whentheindexedcolumnfortherowsisupdatedinthebasetable（）

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

多项选择题The session of user SCOTT receives the following error after executing an UPDATE command onthe EMP table：  ERROR at line 1：  ORA-00060： deadlock detected while waiting for resource  On investigation， you find that a session opened by user JIM has a transaction that caused the deadlock.  two statements are true regarding the session of SCOTT in this scenario（）

A.The session is terminated after receiving the error and JIM can continue with his transaction.
B.SCOTT should perform a COMMIT or ROLLBACK to allow JIM to continue with his transaction.
C.The session is rolled back after receiving the error and JIM can continue with his transaction.
D.SCOTT has to reexecute the last command in the transaction after he commits the transaction.