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Oracle9i dba new features for Oracle7.3 and Oracle9 ocps Sample Questions:

1. Examine this fragment from a SQL*Plus session:
SQL> SELECT name, value FROM v$sysstat 2> WHERE name LIKE 'work area executions%';
NAME VALUE
work area executions - optimal 1544 work area executions - onepass 11 work area executions - multipass 1038
What can you conclude about the setting of the PGA_AGGREGATE_TARGET initialization parameter?

A) It is probably at its optimal setting because the ratio of one pass to multipass work area executions is below 0.10 (ten percent).
B) You cannot conclude anything because these statistics are not related to the PGA_AGGREGATE_TARGET parameter.
C) It may be set too low because there are many more multipass work area executions than one pass executions.
D) It may be set too high because there are many more multipass work area executions than one pass executions.

2. What do you need to do in order for the Database Resource Manager to estimate, in advance, the execution time of a statement?

A) Set the TIMED_STATISTICS initialization parameter.
B) Set the TIMED_OS_STATISTICS initialization parameter.
C) Gather optimizer statistics on related objects.
D) Nothing

3. What is true if you want to switch undo tablespaces from the current one, called UNDO1, to a new one called UNDO2?

A) It is possible to switch to UNDO2; current active transactions will be automatically migrated to UNDO2.
B) It is possible to switch to UNDO2; only current active transactions will continue to execute inside UNDO1.
C) It is possible to switch to UNDO2, but current active transactions will abort.
D) It is NOT possible to switch unless no active transaction exists in UNDO1.

4. Examine this statement:
SELECT *
FROM ( SELECT class_id, crs_id
FROM classes
ORDER BY start_date DESC)
WHERE ROWNUM < 11;
What will happen when this executes?

A) An error is returned citing an ORDER BY clause reference to a column that is not selected.
B) An error is returned citing an ORDER BY clause embedded within a subquery.
C) The ten rows with the latest start date will be returned.
D) The ten rows with the earliest start date will be returned.

5. Which type of ROWID does Oracle use for global indexes on partitioned tables?

A) local
B) extended
C) restricted

Solutions: