Which command is used to back out a subset of database changes that have been made within a unit of work、

试卷相关题目

• 1When a COMMIT statement is executed, what happens、

  A.All locks held on the database are automatically released.

  B.Data stored in global temporary tables is automatically deleted.

  C.Open cursors defined WITH HOLD are closed, but their data is retaine

  D.D. The current transaction is terminated and a new transaction boundary is started.

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• 2Which operation normally does NOT require an exclusive lock、

  A.BIND

  B.DROP

  C.GRANT

  D.SELECT

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• 3What isolation level prevents dirty reads, nonrepeatable reads, and phantoms、

  A.Read stability (RS)

  B.Cursor stability (CS)

  C.Repeatable read (RR)

  D.Uncommitted read (UR)

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• 4What is the act of exchanging one lock an application holds on a resource for a more restrictive lock on the same resource known as、

  A.Lock escalation

  B.Lock substitution

  C.Lock switch/exchange

  D.Lock conversion/promotion

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• 5When is an INTENT EXCLUSIVE (IX) lock required、

  A.When a transaction intends to read or change data.

  B.When a transaction intends to change but not read data.

  C.When a transaction intends to read but not change data.

  D.When a transaction intends to change the system catalog.

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• 6An SQL function designed to convert temperatures from Fahrenheit to Celsius was created as follows:  CREATE FUNCTION conv_temp(IN temp_f FLOAT)  RETURNS INTEGER  NO EXTERNAL ACTOIN  SPECIFIC convert_ftoc  RETURN INT((temp_f-32)/1.8) How can this function be used to convert average temperature (AVG_TEMP) data stored in a table called CLIMATE_INFO、

  A.CALL conv_temp(climate_info.avg_temp);

  B.CALL convert_ftoc(climate_info.avg_temp);

  C.SELECT conv_temp(avg_temp) FROM climate_info;

  D.SELECT convert_ftoc(avg_temp) FROM climate_info;

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• 7If a table named MY_TAB contains 100 rows and the following statement is executed:  DELETE FROM   (SELECT * FROM my_tab   ORDER BY col1 DESC   FETCH FIRST 5 ROWS ONLY) AS tmp; What will happen、

  A.The last 5 rows in the table will be deleted.

  B.The first 5 rows in the table will be deleted.

  C.The statement will fail because a subquery cannot be used with a DELETE statement.

  D.The statement will fail because a table name was not specified with the DELETE statement.

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• 8Given an EMPLOYEES table and a SALES table, a user wants to produce a list of all employees and their associated revenue, even if no revenue exists. Which SQL statement will produce the desired list、

  A.SELECT employees.name, sales.revenue FROM employees INNER JOIN sales ON employees.id =sales.emp_id

  B.SELECT employees.name, sales.revenue FROM employees INNER JOIN sales ON sales.emp_id =employees.id

  C.SELECT employees.name, sales.revenue FROM sales LEFT OUTER JOIN employees ONemployees.id = sales.emp_id

  D.SELECT employees.name, sales.revenue FROM sales RIGHT OUTER JOIN employees ONemployees.id = sales.emp_id

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• 9Which two operations are allowed in the body of an SQL scalar user-defined function、 (Choose two.)

  A.CALL statements.

  B.External file access.

  C.Use of a scratch pa

  D.D.COMMIT statements.

  E.SQL control statements.

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• 10Which command will delete all rows from a table without generating log records、

  A.TRIM

  B.DROP

  C.DELETE

  D.TRUNCATE

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