Query Regarding LOGFILES In Database

*{color:#993366}Consider the following facts about database:*
*{color}*
{color:#ff00ff}{color:#0000ff}-The database is in NOARCHIVELOG mode
-The database has three redologgroups.
-All the groups have one member each.
-Redolog3 is the current group.{color}
{color}
Now, we had executed the following command:
SQL>ALTER DATABASE DROP LOGFILE MEMBER
2'D:\\ORACLE\\ORADATA\\MYDB\\REDOLOG3.LOG';
The command fails to drop a member. What is the reason displayed for droping of the failure of the command?
A)You cannot drop a member from a group as the database is in NOARCHIVELOG mode.
B)You cannot drop the last member in a group.
C)You cannot drop a member when a database is open.
D)You cannot drop a member until checkpoint completes.

user10182925 wrote:
Hi Guys,
I support with answer B only, Hope D is the correct answer if only two members were there...?Got confused why you are going to support with B?
Yours scenario says that you have 3 redo log group and 3rd group is current..
-The database has three redologgroups.
-All the groups have one member each.
-Redolog3 is the current group.Now according to above scenario
SQL>ALTER DATABASE DROP LOGFILE MEMBER 2'D:\\ORACLE\\ORADATA\\MYDBREDOLOG3.LOG';The command fails to drop a member. What is the reason displayed for droping of the failure of the command?
As yours redo log group 3 file is current which is being used ,unless DBWn writes all of those blocks that contained within this current log file then oracle no longer can reuse it nor can drop it.
As far as concern with B
B)You cannot drop the last member in a group.
According to given scenario B,you can drop last redolog group if you have remaining group not less then 2 you have 3 redo log groups as well this redo log is other then current or active.
Khurram

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