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NEW QUESTION: 1
You want to enable automatic PGA memory management in your database. Which setting is required to achieve this?
A. Set the STATISTICS_LEVEL parameter to BASIC
B. Set MEMORY_TARGET to zero
C. Set the WORKAREA_SIZE_POLICY parameter to MANUAL
D. Set the PGA_AGGREGATE_TARGET parameter to nonzero value
Answer: D
Explanation:
Automatic PGA Memory Management: When automatic memory management is disabled and PGA_AGGREGATE_TARGET is set to a nonzero value, the database uses automatic PGA memory management. In this mode, the PGA_AGGREGATE_TARGET specifies a target size for the instance PGA. The database then tunes the size of the instance PGA to this target and dynamically tunes the sizes of individual PGAs. If you do not explicitly set a target size, then the database automatically configures a reasonable default.
NEW QUESTION: 2
A. Option E
B. Option B
C. Option D
D. Option C
E. Option A
Answer: C,D
NEW QUESTION: 3
Which two statements are true when row archival management is enabled?
A. The ROW ARCHIVAL VISIBILITY session parameter defaults to active rows only.
B. The ORA_ARCHIVE_STATE column is updated automatically by the Oracle Server based on activity tracking columns, to Indicate that a row is no longer considered active.
C. The ORA_ARCHIVE_STATE column visibility is controlled by the ROW ARCHIVAL VISIBILITY session parameter.
D. The ORA_ARCHIVE_STATE column is updated manually or by a program that could reference activity tracking columns, to indicate that a row is no longer considered active.
E. The ORA_ARCHIVE_STATE column is visible if referenced in the select list of a query.
Answer: C,D
Explanation:
A: Below we see a case where we set the row archival visibility parameter to "all"
thereby allowing us to see all of the rows that have been logically deleted:
alter session set row archival visibility = all;
We can then turn-on row invisibility back on by changing row archival visibility = "active":
alter session set row archival visibility = all;
B: To use ora_archive_state as an alternative to deleting rows, you need the following settings and parameters:
1.Create the table with the row archival clause
2.Now that the table is marked as row archival, you have two methods for removing rows, a permanent solution with the standard delete DML, plus the new syntax where you set ora_archive_state to a non-zero value:
update mytab set ora_archive_state=2 where col2='FRED';
3.To make "invisible rows" visible again, you simply set the rows ora_archive_state to zero:
create table mytab (col1 number, col2 char(200)) row archival; update mytab set ora_archive_state=0 where col2='FRED';
Note:
* Starting in Oracle 12c, Oracle provides a new feature that allow you to "logically delete" a row in a table without physically removing the row. This effectively makes deleted rows "invisible" to all SQL and DML, but they can be revealed at any time, providing a sort of "instant" rollback method.
To use ora_archive_state as an alternative to deleting rows.
NEW QUESTION: 4
충분한 기술 지식을 가진 사람이 보안 절차를 피하고 프로덕션 프로그램을 변경하지 못하게 하려면 다음을 수행하는 것이 가장 좋습니다.
A. 테스트 데이터를 주기적으로 실행합니다.
B. 작업 보고서 검토가 완료되었습니다.
C. 독립적으로 제어되는 사본이 있는 프로덕션 프로그램 비교
D. 적절한 직무 분리 제공.
Answer: D
Explanation:
When duties are separated, users cannot obtain a detailed knowledge of programs and computer operators cannot gain unsupervised access to production programs.