Tag: databases

Questions Related to databases

To increase the availability of an Advanced Replication environment, you can add a new master to a replication group without quiescing the group. This is achived _________________.
technology databases

  1. Only when the new master site already has existing replication groups.

  2. By issuing a single command to create , populate, and activate the new master.

  3. When the master definition site is not the same for all of the master grouups.

  4. Without impacting end users who are executing data manipulation language (DML) commands on the replicated tables.

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Correct Option: D

Consider this syntax MERGE INTO t1 USING t2 ON (join predicate) .... What does the MERGE syntax do ?
technology databases

  1. It performs a merge join of the row from T2 only if it does'nt exist in the T1 table.

  2. It creates a natural join of table T1 and T2 for all columns that have the same name.

  3. It creates a Cartesian prodcut of table T1 and table T2 for all columns that have the same name.

  4. For each row from T2, it updates the row if it exists witin table T1, otherwise it inserts the row into T1.

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Correct Option: D

Which modifier is used to change listener parameters in the Listener Control utility environment?
technology databases

  1. SET

  2. ALTER

  3. CHANGE

  4. UPDATE

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Correct Option: A

Which background process reads the redo log buffer and writes it to a file ?
technology databases

  1. ARCn

  2. DBWn

  3. CKPT

  4. LGWR

  5. PMON

  6. SMON

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Correct Option: D

You have used the CROSSCHECK BACKUP command to verify that the backups recorded in the RMAN repository actually exist. Which command should you now use to check if any of the files were missing?
technology databases

  1. LIST EXPIRED

  2. DELETE EXPIRED

  3. DELETE OBSOLETE

  4. CHANGE UNCATALOG

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Correct Option: A

You want to drop the TBSI tablespace from your database. You also want to delete corresponding data files automatically, and not have to do it manually. What should you do ?
technology databases

  1. User the DROP DATAFILE command.

  2. Use the DROP TABLESPACE command.

  3. Ensure that all database files are Oracle Managed Files(OMF) before using the DROP TABLESPACE command.

  4. Ensure that the DB_FILE_CREATE_DEST initialization parameter is set before using the DROP TABLESPACE command.

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Correct Option: B

You need to enforce these two business rules: 1. No two rows of a table can have duplicate values in the specified column. 2. A column cannot contain null values. Which type of constraint ensure that both of the above rules are true ?
technology databases

  1. Check

  2. Unique

  3. Not Null

  4. Primary Key

  5. Foreign Key

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Correct Option: D

The ORDERS table has a constant transaction load 24 hours a day, so down time is not allowed. The index become fragmented. Whic statment is true ?
technology databases

  1. The index need to be dropped, and then re-created.

  2. The resolution of index fragmentation depends on the type of index.

  3. The index can be rebuilt while users continue working on the table.

  4. The fragmented can be ignored because Oracle resolve index fragmentation by means of a freelist.

  5. The index can be rebuilt, but users will not have access to the index during this time.

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Correct Option: C

You omit the UNDO tablespace clause in your CREATE DATABASE statment. The UNDO_MANAGEMENT parameter is set to AUTO. What is the result of your CREATE DATABASE statement ?
technology databases

  1. The oracle server creates no undo tablespace.

  2. The oracle server creates an undo segment in the system tablespace.

  3. The oracle server cerates one undo tablespace with the name SYS_UNDOTBS.

  4. Database creation fails because you did not specify an undo tablespace on the create database statment.

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Correct Option: C

John has created a procedure named SALARY_CALC. Which SQL query allow him to view text of procedure?
technology databases

  1. SELECT text FROM user_source WHERE name = 'SALARY_CALC';

  2. SELECT * FROM user_source WHERE name='SALARY_CALC';

  3. SELECT * FROM user_objects WHERE object_name='SALARY_CALC';

  4. SELECT * FROM user_procedures WHERE object_name='SALARY_CALC';

  5. SELECT text FROM user_source WHERE name='SALARY_CALC' and owner='JOHN'

Show answer
Correct Option: A
Explanation:

The correct SQL query to view the text of the procedure named SALARY_CALC, created by John, would be:

A. SELECT text FROM user_source WHERE name = 'SALARY_CALC';

This query selects the text column from the user_source table where the name is equal to 'SALARY_CALC'. This will retrieve the text of the procedure.

The other options are incorrect because:

B. SELECT * FROM user_source WHERE name='SALARY_CALC'; This query selects all columns from the user_source table where the name is equal to 'SALARY_CALC'. It will retrieve all details of the procedure, not just the text.

C. SELECT * FROM user_objects WHERE object_name='SALARY_CALC'; This query selects all columns from the user_objects table where the object_name is equal to 'SALARY_CALC'. This will retrieve details about the object, but not the text of the procedure.

D. SELECT * FROM user_procedures WHERE object_name='SALARY_CALC'; This query selects all columns from the user_procedures table where the object_name is equal to 'SALARY_CALC'. This will retrieve details about the procedure, but not the text of the procedure.

E. SELECT text FROM user_source WHERE name='SALARY_CALC' and owner='JOHN'; This query selects the text column from the user_source table where the name is equal to 'SALARY_CALC' and the owner is equal to 'JOHN'. This query assumes that John is the owner of the procedure. If John is indeed the owner, this query will work. However, if John is not the owner, it will not retrieve the text of the procedure.

So, the correct answer is option A.