單項選擇題

ou executed the command to create a password file in the database server： $ orapwd file=orapworcl entries=5 ignorecase=N
Which statement describes the purpose of the above password file（）

A.It records usernames and passwords of users when granted the DBA role.
B.It contains usernames and passwords of users for whom auditing is enabled.
C.It is used by Oracle to authenticate users for remote database administration.
D.It records usernames and passwords of all users when they are added to OSDBA or OSOPER operating system groups.

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多項選擇題

Your database instance is running with full workload after database creation. You have decided to useafixed-sizeundo tablespace. You want to use the Undo Advisor to estimate the capacity of the undotablespace.
Which two factors must you consider before using the Undo Advisor to estimate the capacity of the undotablespace（）

A.the retention period to support flashback
B.the expected length of the longest-running query
C.the number of undo tablespaces in the database
D.the size of the Flash Recovery Area for the database instance

單項選擇題

Which statement is true about the UNDO_RETENTION parameter when retention guarantee is notenabled（）

A.It is the time period after which the undo data becomes obsolete.
B.It is the time period after which the committed undo data would be transferred to a temporarytablespace.
C.It is the minimum time period up to which the committed undo data would be retained if free undo spaceis available.
D.It is the time period after which the undo data is transferred to the Flash Recovery Area to provide readconsistency.

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ou executed the command to create a password file in the database server： $ orapwd file=orapworcl entries=5 ignorecase=N Which statement describes the purpose of the above password file（）

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Which statement is true about the UNDO_RETENTION parameter when retention guarantee is notenabled（）

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ou executed the command to create a password file in the database server： $ orapwd file=orapworcl entries=5 ignorecase=N
Which statement describes the purpose of the above password file（）