OCP-1Z0-053-V13.02-620题

620.You are using the control file to maintain information about the database backups that are being

performed by Recovery Manager (RMAN).

Identify two scenarios is which you must have a recovery catalog. (Choose two.)

A. To store the backup information of multiple database

B. To restrict the amount of space that is used by the backups

C. To maintain a backup for a certain time is set by the CONTROL_FILE_RECORD_KEEP_TIME parameter.

D. To list the data files that were in a target database at a given time by using the AT option of REPORT SCHEMA command.

Answer: AD

答案解析：

参考：http://docs.oracle.com/cd/E11882_01/backup.112/e10643/rcmsynta2006.htm#RCMRF90281

题中意在比较控制文件和恢复目录，指出两个必须只用恢复目录的场景：

A，可以存储多个数据库的备份信息，恢复目录可以做到，控制文件只能记录一个数据库的备份信息

D，atClause：

This subclause specifies a point in time as a time, SCN, or log sequence number. You must be connected to a recovery catalog when issuing a REPORT SCHEMAcommand with an AT clause.

atClause

This subclause specifies a point in time as a time, SCN, or log sequence number. You must be connected to a recovery catalog when issuing a REPORT SCHEMAcommand with an AT clause.

Syntax Element	Description
AT SCN integer	Specifies an SCN.
AT SEQUENCE integer	Specifies a log sequence number. The integer indicates the time when the specified log was first opened.
THREAD integer	Specifies a redo THREAD number. The integer indicates the time when the thread was first opened.
AT TIME 'date_string'	Specifies a date (see Example 3-14). The NLS_LANG and NLS_DATE_FORMAT environment variables specify the format for the time.

Example 3-14 Reporting a Database Schema

This example, which requires a recovery catalog, reports the names of all data files and tablespaces 20 minutes ago.

RMAN> REPORT SCHEMA AT TIME 'sysdate-20/1440';

 

Report of database schema for database with db_unique_name PROD

 

List of Permanent Datafiles

===========================

File Size(MB) Tablespace           RB segs Datafile Name

---- -------- -------------------- ------- ------------------------

1    450      SYSTEM               YES     /disk1/oradata/prod/system01.dbf

2    197      SYSAUX               YES     /disk1/oradata/prod/sysaux01.dbf

3    20       UNDOTBS              YES     /disk1/oradata/prod/undotbs01.dbf

4    10       CWMLITE              YES     /disk1/oradata/prod/cwmlite01.dbf

5    10       DRSYS                YES     /disk1/oradata/prod/drsys01.dbf

6    10       EXAMPLE              YES     /disk1/oradata/prod/example01.dbf

7    10       INDX                 YES     /disk1/oradata/prod/indx01.dbf

8    10       TOOLS                YES     /disk1/oradata/prod/tools01.dbf

9    10       USERS                YES     /disk1/oradata/prod/users01.dbf

 

List of Temporary Files

=======================

File Size(MB) Tablespace           Maxsize(MB) Tempfile Name

---- -------- -------------------- ----------- --------------------

1    40       TEMP                 32767       /disk1/oradata/prod/temp01.dbf