单项选择题

The following statements: CREATE TABLE t1 (col1 INT NOT……

The following statements:
CREATE TABLE t1 (col1 INT NOT NULL, PRIMARY KEY(col1)); CREATE TABLE t2 (col1 INT NOT NULL, col2 CHAR(1) NOT NULL, PRIMARY KEY (col1, col2), FOREIGN KEY (col1) REFERENCES t1 (col1) ON DELETE CASCADE ON UPDATE RESTRICT); CREATE TABLE t3 (col1 INT NOT NULL, col2 INT NOT NULL, PRIMARY KEY (col1, col2),FOREIGN KEY (col1) REFERENCES t1 (col1) ON DELETE NO ACTION ON UPDATE RESTRICT);INSERT INTO t1 VALUES (1), (2); INSERT INTO t2 VALUES (1, 'a'), (1, 'b'), (2,'c'); INSERT INTO t3 VALUES (1, 100), (2, 200), (2,300);
How many rows will be deleted by the following DELETE statement? DELETE FROM t1 WHERE col1= 1;（）

A.4
B.3
C.1
D.0

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单项选择题Within the application MY_APP the following PREVIOUS VALUE expression references the sequence MY_SEQ: PREVIOUS VALUE FOR my_seq After which of the following events will the most recently generated value of MY_SEQ persist so that it can be returned to the active MY_APP application?（）

A.After a ROLLBACK is issued
B.After the sequence is altered
C.After the sequence is dropped
D.After the current session ends

单项选择题Given the following ALTER SEQUENCE statement: ALTER SEQUENCE myseq RESTART WITH 0 INCREMENT BY 1 NO MAXVALUE CACHE 5 ORDER Assuming that the sequence had reached a value of 100 prior to the RESTART, which of the following is true?（）

A.The next value will be 0 and the sequence will never use the values 101 to 105.
B.The next value will be 101 to ensure uniqueness between existing and newly generated sequence values.
C.Previously cached values are retained by DB2, and after the restart, will be used for values 101 to 105.
D.The next value will be 0 and DB2 will not ensure uniqueness between existing and newly generated values.

单项选择题A DRDA host database resides on a z OS or an i5 OS system and listens on port 446. The TCP IP address for this system is 192.168.10.1 and the TCP IP host name is myhost. Which of the following commands is required to update the local node directory so that a DB2 client can access this DRDA database?（）

A.CATALOG TCPIP NODE myhost REMOTE db2srv SERVER 446
B.CATALOG TCPIP NODE mydb2srv REMOTE myhost SERVER 446
C.CATALOG TCPIP NODE myhost REMOTE db2srv SERVER 192.168.10.1
D.CATALOG TCPIP NODE mydb2srv REMOTE myhost SERVER 192.168.10.1

单项选择题Which object may be used during query optimization to improve the performance for a subset of SELECT queries?（）

A.MQT
B.Trigger
C.Read Only Cursor
D.Stored Procedure

单项选择题To which of the following resources can a lock be applied?（）

A.Row
B.Alias
C.Bitmap
D.Column