单选题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 wil

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第2题：

You issued the following statement：   SQL> ALTER SESSION SET NLS_LANG=FRENCH_CANADA.WE8ISO8859P1；   Which parameter is NOT overridden by using the above statement？（）  

• A、 the value of the NLS_LANGUAGE variable
• B、 the value of the NLS_TERRITORY variable
• C、 the value of the NLS_CURRENCY variable
• D、the character encoding scheme used by the client application

第3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

第4题：

A sequence was created with the DDL statement shown below:CREATE SEQUENCE my_sequence CACHE 10 ORDER The following statements are successfully executed in sequence through separate database connections: CONNECTION1 - VALUES NEXT VALUE FOR my_sequence INTO :con1hvar CONNECTION2 - VALUES NEXT VALUE FOR my_sequence INTO :con2hvar CONNECTION1 - VALUES NEXT VALUE FOR my_sequence INTO:con1hvarWhat is the current value of the :con1hvar host variable?（）

• A、2
• B、3
• C、11
• D、30

第5题：

Which of the following privileges permits a user to update the comment on a sequence?（）

• A、CONTROL
• B、UPDATE
• C、USAGE
• D、ALTER

第6题：

Your database operates in ARCHIVELOG mode. The redo log files are not multiplexed and one of the online redo logs is missing. The missing redo log sequence， 230， is not archived， and it contained information from 10：35 a.m. onwards.  The current time is 11：00 a.m. Because of a disk crash， you executed the following command to perform an incomplete recovery：  RMAN> RUN {  2> SET UNTIL SEQUENCE 230 THREAD 1;  3> ALTER DATABASE MOUNT;  4> RESTORE DATABASE;  5> RECOVER DATABASE;  6> ALTER DATABASE OPEN RESETLOGS; 7> };  With reference to this scenario， which statement is true？（）

• A、RMAN recovers up to log sequence 230， but not including 230.
• B、RMAN returns an error because the log sequence number mentioned in the command should be 229.
• C、RMAN returns an error because the log sequence number mentioned in the command may never be missing.
• D、RMAN recovers up to and including log sequence 229 but then returns an error because log sequence 230 is missing.

第7题：

What is true about sequences? （）

• A、The start value of the sequence is always 1.
• B、A sequence always increments by 1.
• C、The minimum value of an ascending sequence defaults to 1.
• D、The maximum value of descending sequence defaults to 1.

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第13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.

第14题：

Which of the following is a characteristic of a sequence?（）

• A、A sequence will never generate duplicate values
• B、The MAXVALUE of a sequence can be equal to the MINVALUE
• C、It is not possible to create a sequence that generates a constant since the INCREMENT value must be greater than zero
• D、When a sequence cycles back to either the MAXVALUE or MINVALUE, it will always be equal to the specified value of either of these two boundaries

第15题：

Which of the following is a feature of a unit of work?（）

• A、It applies to a single data server.
• B、It is a recoverable sequence of operations.
• C、Its value can be queried from the system catalog tables.
• D、It begins when the application connects to the data server.

第16题：

A sequence was created with the DDL statement shown below:CREATE SEQUENCE my_seq START WITH 5 INCREMENT BY 5 CACHE 5 User1 successfully executes the following statements in Connection1: VALUES NEXT VALUE FOR my_seq INTO :con1hvar VALUES NEXT VALUE FOR my_seq INTO :con1hvar User2 successfully executes the following statement in Connection2: VALUES NEXT VALUE FOR my_seq INTO :con2hvar After User1 & User2 are finished, User3 executes the following statement in Connection3: SELECT NEXT VALUE FOR my_seq FROM sysibm.sysdummy1Which value will be returned by the query?（）

• A、20
• B、25
• C、50
• D、55

第17题：

When performing an online backup，what is the proper order of the following steps？（）   a. Issue the alter database end backup command. b. Back up the archived redo logs. c. Issue the alter database begin backup command.  d. Back up the database files.  e. Determine the beginning log sequence number. f. Determine the ending log sequence number.  g. Force a log switch with the alter system switch logfile command.

• A、a， b， c， d， e， f， g
• B、c， d， a， b， e， g， f
• C、f， d， b， g， a， c， e
• D、e， c， d， a， g， f， b
• E、a， f， b， g， e， c， d

第18题：

Which two statements about sequences are true? （）

• A、You use a NEXTVAL pseudo column to look at the next possible value that would be generated from a sequence, without actually retrieving the value.
• B、You use a CURRVAL pseudo column to look at the current value just generated from a sequence, without affecting the further values to be generated from the sequence.
• C、You use a NEXTVAL pseudo column to obtain the next possible value from a sequence by actually retrieving the value from the sequence.
• D、You use a CURRVAL pseudo column to generate a value from a sequence that would be used for a specified database column.
• E、If a sequence starting from a value 100 and incremented by 1 is used by more then one application, then all of these applications could have a value of 105 assigned to their column whose value is being generated by the sequence.
• F、You use REUSE clause when creating a sequence to restart the sequence once it generates the maximum value defined for the sequence.

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