OCP-1Z0-053-V13.02-620题
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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:
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 SCHEMA
command with an AT
clause.
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.
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