Oracle Golden Gate - Extract DDL only

Question

Hi.  We are working on a golden gate proof of concept.  The way our configuration is set up, we want to pull changes from our standby to keep load low on the primary.  This will require us to extract ddl changes from the primary, so my current plan is to put the dml on a 5 minute delay, and get the ddl immediately from the primary.  I am running into two issues, one I cannot figure out the setting to get DDL only from the primary (right now I am getting both ddl and dml from the primary), and 2, I get the following error  when retrieving data from the standby:  2015-04-16 20:08:40 ERROR OGG-00303 Oracle GoldenGate Capture for Oracle, ext1.prm: Invalid destination "+DATA/dgdemo/archivelog" specified for TRANLOGOPTION ALTARCHIVELOGDEST option, and I also get an error when I do do specify an archivelog destination.  Can anyone point me to the appropriate settings.  Below is the parameter file:
extract ext1
userid ggate password ggate
--TRANLOGOPTIONS ASMUSER sys@ASM ASMPASSWORD password
TRANLOGOPTIONS DBLOGREADER
TRANLOGOPTIONS DBLOGREADERBUFSIZE 2597152,ASMBUFSIZE 28000
TRANLOGOPTIONS ARCHIVEDLOGONLY
TRANLOGOPTIONS ALTARCHIVELOGDEST primary "+DATA/dgdemo/archivelog" RECURSIVE
discardfile ./dirrpt/ext1.dsc,purge
reportcount every 15 minutes, rate
exttrail ./dirdat/t1
table SCOTT.*;

Answer 1

OGG does not support ALTARCHIVELOGDEST parameter in ALO mode till OGG version 12c.
Does GoldenGate Parameter ALTARCHIVELOGDEST Support ASM Diskgroups ? (Doc ID 1393059.1)
Also In order to run Extract in the ALO mode when archived logs are stored in ASM,  the original database configuration must have complete file specification  in  log_archive_dest_n setting. Incomplete file specification leads ASM to ignore  log_archive_format. An Incomplete file spec only contain the diskgroup name  like +ASMDISK1.
Users should ensure log_archive_dest is set using complete file  specification. In that case, log_archive_format is honored by ASM, and  Extract will work correctly.
For example:
alter diskgroup asmdisk2 add directory '+ASMDISK2/archivedir';