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单选题
Which of the following best describes the lock protection provided by DB2 for the current row of a cursor?（）
A
The cursor is only protected from updates and deletes by concurrent applications.
B
The row is only protected from positioned updates and deletes that reference another cursor of the same application.
C
The cursor is protected from positioned updates and deletes that reference another cursor of a different application.
D
The row is protected from updates and deletes by the current application and from positioned updates and deletes that reference another cursor of the same application.
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更多 “单选题Which of the following best describes the lock protection provided by DB2 for the current row of a cursor?（）A The cursor is only protected from updates and deletes by concurrent applications.B The row is only protected from positioned updates and deletes that reference another cursor of the same application.C The cursor is protected from positioned updates and deletes that reference another cursor of a different application.D The row is protected from updates and deletes by the current application and from positioned updates and deletes that reference another cursor of the same application.” 相关考题
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Consider the following:Which statement best describes the meaning of the value for the key_len column?()
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The opening of cursor CSR01 produces the following result set:STUDENT LASTNM FIRSTNM CLASSNO 123 Brown John T100 213 Bailey JamesT100 312 Carter Arlene T210 465 Chas Devon T305 546 Davis Steven T405If this Fetch statement is executed: FETCH csr01 INTO :studnum, :firstname, :lastname, :class Which of the following DELETE statements will cause this row to be deleted?（）A.DELETE ALL FROM tab01 FOR CURRENT OF csr01B.DELETE FROM tab01 FOR CURRENT csr01 WITH RSC.DELETE * FROM tab01 WHERE CURRENT csr01 WITH CSD.DELETE FROM tab01 WHERE CURRENT OF csr01 WITH RR
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The opening of cursor CSR01 produces the following result set: STUDENT LASTNM FIRSTNM CLASSNO 123 Brown John T100 213 Bailey James T100 312 Carter Arlene T210 465 Chas Devon T305 546 Davis Steven T405 If this Fetch statement is executed: FETCH csr01 INTO :studnum, :firstname, :lastname, :class Which of the following DELETE statements will cause this row to be deleted?（）A、DELETE ALL FROM tab01 FOR CURRENT OF csr01B、DELETE FROM tab01 FOR CURRENT csr01 WITH RSC、DELETE * FROM tab01 WHERE CURRENT csr01 WITH CSD、DELETE FROM tab01 WHERE CURRENT OF csr01 WITH RR
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Which of the following is TRUE for the DB2 isolation level Cursor Stability (CS)?（）A、An application process acquires at least a share lock on the current row of every cursor.B、Any row that is read during a unit of work cannot be changed by other application processes until the unit of work is complete.C、Any row changed by another application process can be read, even if the change has not been committed by that application process.D、An application process that issues the same query more than once in a unit of work will not see additional rows caused by other application processes appending new information to the database.
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Which of the following best describes the lock protection provided by DB2 for the current row of a cursor?（）A、The cursor is only protected from updates and deletes by concurrent applications.B、The row is only protected from positioned updates and deletes that reference another cursor of the same application.C、The cursor is protected from positioned updates and deletes that reference another cursor of a different application.D、The row is protected from updates and deletes by the current application and from positioned updates and deletes that reference another cursor of the same application.
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Which of the following best describes how locks are used in DB2?（）A、To maintain control of updated rows for commit processingB、To ensure only committed changes are altered by another applicationC、To allow two applications to update the same row of data simultaneouslyD、To prevent multiple applications from accessing the same data simultaneously
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Consider this syntax： MERGE INTO t1 USING t2 ON （join predicate）….. What does the MERGE syntax do？（）A、It performs a merge join of the row from T2 only if it doesn’t exist in the T1 table. B、It creates a natural join of tables T1 and T2 for all columns that have the same name. C、It creates a Cartesian product of table T1 and table T2 for all columns that have the same name. D、For each row from T2, it updates the row if it exists within table T1, otherwise it inserts the row into T1.
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单选题查询“读者”表的所有记录并存储于临时表文件one中的SQL语句是（ ）。A
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考题
单选题Which of the following best describes how locks are used in DB2?（）A
To maintain control of updated rows for commit processingB
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考题
单选题Which of these best describes the actions taken when a VTP message is received on a switch configuredwith the VTP mode "transparent"？（）A
VTP updates are ignored and forwarded out all ports.B
VTP updates are ignored and forwarded out trunks only.C
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考题
单选题Which of the following will help protect an operating system from vulnerability？（）A
Download free anti-virus programs from the Internet.B
Perform updates from the manufacturers website regularly.C
Using the operating systems email program only to open attachments.D
Monitoring what is displayed on the screen.
考题
单选题The opening of cursor CSR01 produces the following result set: STUDENT LASTNM FIRSTNM CLASSNO 123 Brown John T100 213 Bailey James T100 312 Carter Arlene T210 465 Chas Devon T305 546 Davis Steven T405 If this Fetch statement is executed: FETCH csr01 INTO :studnum, :firstname, :lastname, :class Which of the following DELETE statements will cause this row to be deleted?（）A
DELETE ALL FROM tab01 FOR CURRENT OF csr01B
DELETE FROM tab01 FOR CURRENT csr01 WITH RSC
DELETE * FROM tab01 WHERE CURRENT csr01 WITH CSD
DELETE FROM tab01 WHERE CURRENT OF csr01 WITH RR
考题
单选题Which of these best describes the actions taken when a VTP message is received on a switch configured with the VTP mode "transparent"？ （）A
VTP updates are ignored and forwarded out all ports.B
VTP updates are ignored and forwarded out trunks only.C
VTP updates are made to the VLAN database and are forwarded out trunks only.D
VTP updates are ignored and are not forwarded.
考题
单选题Consider this syntax： MERGE INTO t1 USING t2 ON （join predicate）….. What does the MERGE syntax do？（）A
It performs a merge join of the row from T2 only if it doesn’t exist in the T1 table. B
It creates a natural join of tables T1 and T2 for all columns that have the same name. C
It creates a Cartesian product of table T1 and table T2 for all columns that have the same name. D
For each row from T2, it updates the row if it exists within table T1, otherwise it inserts the row into T1.
考题
多选题Which two statements about subqueries are true? （）AA single row subquery can retrieve data from only one table.BA SQL query statement cannot display data from table B that is referred to in its subquery, unless table B is included in the main query's FROM clause.CA SQL query statement can display data from table B that is referred to in its subquery, without including B in its own FROM clause.DA single row subquery can retrieve data from more than one table.EA single row subquery cannot be used in a condition where the LIKE operator is used for comparison.FA multiple-row subquery cannot be used in an INSERT statement to insert multiple rows at a time.
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DELETE ALL FROM tab01 FOR CURRENT OF csr01B
DELETE FROM tab01 FOR CURRENT csr01 WITH RSC
DELETE * FROM tab01 WHERE CURRENT csr01 WITH CSD
DELETE FROM tab01 WHERE CURRENT OF csr01 WITH RR
考题
单选题A customer wants to have employees work from remote locations as well as in the office. All communications must be secure and files must be protected from access by unauthorized people. The employee’s applications （database inserts and reads） are only accessed with a web browser. Which of the following capabilities is necessary？（）A
SSLB
PGPC
File encryption programD
Public key encryption
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AlternatorsB
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单选题Which of the following is TRUE for the DB2 isolation level Cursor Stability (CS)?（）A
An application process acquires at least a share lock on the current row of every cursor.B
Any row that is read during a unit of work cannot be changed by other application processes until the unit of work is complete.C
Any row changed by another application process can be read, even if the change has not been committed by that application process.D
An application process that issues the same query more than once in a unit of work will not see additional rows caused by other application processes appending new information to the database.
考题
单选题Consider the following: Which statement best describes the meaning of the value for the key_len column?（）A
It shows the total size of the index rowB
It shows how many columns in the index are examinedC
It shows the number of characters indexed in the keyD
It shows how many bytes will be used from each index row
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