Tales From A Lazy Fat DBA

Hi Guys,

Recently someone asked why we have this strange looking entry in Golden Gate extract parameter file which reads ‘TRANLOGOPTIONS EXCLUDETAG 00‘. Why is that, what are those numbers ? I was able to explain him the purpose, would like to write a short post about it.

OGG v12.1.2 has a new EXTRACT parameter TRANLOGOPTIONS EXCLUDETAG. This is typically used to exclude the REPLICAT user in bi-directional configurations. When Extract is in classic or integrated capture mode, use the TRANLOGOPTIONS parameter with the EXCLUDETAG tag option. This parameter directs the Extract process to ignore transactions that are tagged with the specified redo tag. For example:

extract exttestpd
useridalias clouduser
EXTTRAIL ./dirdat/rp, format release 12.1
ddl include all
ddloptions addtrandata, report
tranlogoption excludetag 00 
TABLE dixituser.*;

Changes made by Integrated REP are tagged by default in redo as 00. So adding the EXTRACT parameter TRANLOGOPTIONS EXCLUDETAG 00 Would exclude those operations. The tag can also be explicitly set in REPLICAT using:

DBOPTIONS SETTAG 0885

Then in EXTRACT param:

TRANLOGOPTIONS EXCLUDETAG 0885

The TRANLOGOPTION EXCLUDETAG 00 prevents Golden Gate extract from capturing transactions from the replication which are by default tagged with “00”. The excludetag will ensure that the we don’t run into problems with ping-pong updates.

Some other possible examples of using this parameter are …

TRANLOGOPTIONS EXCLUDETAG 00
TRANLOGOPTIONS EXCLUDETAG +
TRANLOGOPTIONS EXCLUDETAG 0991
TRANLOGOPTIONS EXCLUDETAG 2222 4444

Hope It Helped
Prashant Dixit