About standby redo logs

I create 4 standby redo log groups, and use LGWR in primary site to
transfer redo data, all are good. 
But when I query the V$STANDBY_LOG view,
I found that only the status column of GROUP# 4(the first group of my
standby redo logs) value is "ACTIVE" while all the others(5-7) are
"UNASSIGNED".
also, only GROUP# 4's sequence# is a value greate than 0
and THREAD# is 1, all others are 0 and 0.

Any explains.

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Kamus <kamusis@xxxxxxxxx>

那么多1G的邮箱，我能用来干什么:-)
A Oracle8i & 9i Certified DBA from China

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