单选题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 I

第1题：

第2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3题：

第4题：

What is true about sequences? （）

• A、Once created, a sequence belongs to a specific schema.
• B、Once created, a sequence is linked to a specific table.
• C、Once created, a sequence is automatically available to all users.
• D、Only the DBA can control which sequence is used by a certain table.
• E、Once created, a sequence is automatically used in all INSERT and UPDATE statements.

第5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6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7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8题：

第9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10题：

Which of the following can be used in conjunction with a Flashback Versions Query to filter the results？（）

• A、 A range of SCN values
• B、 A list of SCN values
• C、 A starting and ending timestamp
• D、 Minimum and maximum sequence values
• E、 A list of sequence values