Oracle 10g dataguard Connect-time failover Parameter 15 minutes

Hello,
we running a system with DataGuard in Maximum Availability protection mode and one physical Standby Database. There are two connections between primary and standby. I configured listener and tnsnames to perform a Connect-time failover in case one connection is down. In first place it seemed to work fine but since it has happened that the primary always hangs for exactly 15 minutes until the failover is performed. (ALL redologs need archiving)
I think this must be the default value of a Parameter but reading docs for hours I can't find it.
Can anybody help me?
Best regards
Fritz

It's like this. The connection failover I'm talking about is only between the primary database and standby database. I have two connections between them. That makes two addresses for the service (servicetostandby) specified in the log_archive_dest used by dataguard. In my case the log_archive_dest Paramater looks like this:
log_archive_dest_3 = 'SERVICE servicetostandby OPTIONAL LGWR SY
NC AFFIRM VALID_FOR=(ONLINE_LO
GFILES,PRIMARY_ROLE) DB_UNIQUE
NAME=standby REOPEN=10 NETTIME
OUT=9'
The tnsnames.ora entry looks like this:
servicetostandby =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = address1)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = address2)(PORT = 1521))
(FAILOVER=true)
(LOAD_BALANCE=false)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = standby)
So if either address1 or address2 is down dataguard should use the other address to connect to the standby database.
Maybe because of the Maximum Availability protection mode the primary database does not perform if the standby database is not available. I'm not sure about that. But fact is that if I power off the standby database, the primary database hangs only for 9 seconds. That's specified in the net_time_out attribut of the log_archive_dest Parameter. So I'm quite sure that something in the oracle net service causes the problem.
With the "primary hangs" I mean: After the used connection (say address1) went down the redologfiles of the primary database get filled and then it stops for 15 minutes. The messages in the alert.log:
Thread 1 cannot allocate new log, sequence 1304
All online logs needed archiving
After 15 minutes the connection via address2 is established and everything works fine.
I hope I made myself clear this time and didn't confuse you totally.
Edited by: user633694 on Apr 14, 2009 8:13 AM

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