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Oracle9i program with pl/sql Sample Questions:

1. Which three statements are true regarding database triggers? (Choose three)

A) A database trigger executes implicitly whenever a particular event takes place.
B) With a schema, triggers fire for each event for all users; with a database, triggers fire for each event for that specific user.
C) A database trigger is a PL/SQL block, C, or Java procedure associated with a table, view, schema, or the database.
D) A database trigger fires whenever a data event (such as DML) or system event (such as logon, shutdown) occurs on a schema or database.
E) A database trigger needs to be executed explicitly whenever a particular event takes place.

2. There is a CUSTOMER table in a schema that has a public synonym CUSTOMER and you are granted all object privileges on it. You have a procedure PROCESS_CUSTOMER that processes customer information that is in the public synonym CUSTOMER table. You have just created a new table called CUSTOMER within your schema. Which statement is true?

A) If the structure of your CUSTOMER table is the same as the public synonym CUSTOMER table then the procedure PROCESS_CUSTOMER is invalidated and gives compilation errors.
B) If the structure of your CUSTOMER table is entirely different from the public synonym CUSTOMER table then the procedure PROCESS_CUSTOMER successfully recompiles and accesses your CUSTOMER table.
C) Creating the table has no effect and procedure PROCESS_CUSTOMER still accesses data from public synonym CUSTOMER table.
D) If the structure of your CUSTOMER table is the same as the public synonym CUSTOMER table then the procedure PROCESS_CUSTOMER successfully recompiles when invoked and accesses your CUSTOMER table.

3. You have an AFTER UPDATE row-level on the table EMP. The trigger queries the EMP table and inserts the updating user's information into the AUDIT_TABLE.
What happens when the user updates rows on the EMP table?

A) A runtime error occurs. The effect of trigger body and the triggering statement are rolled back.
B) A compile time error occurs.
C) The trigger fires successfully. The update on the EMP table occurs, and data is inserted into theAUDIT_TABLE table.
D) A runtime error occurs. The effect of trigger body is rolled back, but the update on the EMP table takes place.
E) A runtime error occurs. The update on the EMP table does not take place, but the insert into the AUDIT_TABLE occurs.

4. You need to create a trigger on the EMP table that monitors every row that is changed and places this information into the AUDIT_TABLE.What type of trigger do you create?

A) Statement-level trigger on the AUDIT_TABLE table.
B) Statement-level trigger on the EMP table.
C) FOR EACH ROW statement-level trigger on the EMPtable.
D) FOR EACH ROW trigger on the EMP table.
E) FOR EACH ROW trigger on the AUDIT_TABLE table.

5. You have created a stored procedure DELETE_TEMP_TABLE that uses dynamic SQL to remove a table in your schema. You have granted the EXECUTE privilege to user A on this procedure.
When user A executes the DELETE_TEMP_TABLE procedure, under whose privileges are the operations performed by default?

A) SYS privileges
B) User A's privileges
C) Public privileges
D) Your privileges
E) User A cannot execute your procedure that has dynamic SQL.

Solutions: