In order for the extract process to read from the redo logs located on ASM diskgroup you need to specify a connect string in the tnsnames.ora like the following.
ASM=
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost.localdomain)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = +ASM)
)
)
ASM=
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost.localdomain)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = +ASM)
)
)
To test the connection run a remote connection sqlplus session
[oracle@localhost admin]$ sqlplus sys@asm as sysdba
SQL*Plus: Release 11.2.0.1.0 Production on Fri Mar 21 12:59:43 2014
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Enter password:
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Automatic Storage Management option
SQL> select instance_name,status from v$instance;
INSTANCE_NAME STATUS
---------------- ------------
+ASM STARTED
In the extract parameter file make an entry like following.
TRANLOGOPTIONS ASMUSER SYS@ASM, ASMPASSWORD XXXXX
There is another option to read from ASM .Some versions support the following option.
TRANLOGOPTIONS DBLOGREADER
