GoldenGate Extract Process will not read from redo log with manual help

Question

Here is my issue.
I have GoldenGate replication successfully setup one-way from 1 Source to Many Targets. There is 1 source extract on the DB and many pumps that push the trail file data to the Targets. Replication does work but after manual help with starting up the Source Extract process.
If I execute the command:
GGSCI> alter extract <source extract name> begin now
GGSCI> view report <source extract name>
The extract starts and reads the source trail file but will not process data, I continually see in the ggserr.log file "OGG-01515: Positioning to begin time MMM DD, YYYY, HH:MM:SS" The date and time are irrevelant for this problem.
When I see this, I SQ*Plus into the database and look in the v$log table for the current log and sequence #.
I return to GGSCI and issue the following command:
GGSCI> alter extract <source extract name> thread 1 extseqno <sequence # from v$log query>
GGSCI> start <source extract name>
It then works as expected. Why is this so? I thought the alter extract <source extract name> begin now would do the same output.
We do use ASM but like I said when I issue the:
GGSCI> alter extract <source extract name> thread 1 extseqno <sequence # from v$log query>
It works like it should.
Very weird.
- Jason

Answer 1

Yes, supplemental logging is enabled on both the source and the targets, but why would supplemental logging on the targets have any affect on why the Source Extract on the source can't read from the source redo log?
This is not a RAC database, rather single-instance with one thread. Also, we are using DBLOGREADER functionality as it is an 11.2.0.3 database.
My issue is simply, when I start the source extract from being down, meaning it isn't running, I issue this command:
alter <source extract> begin now
start <source extract>
view report <source extract>
OGG-01515 Positioning to begin time <today's date and time> ie Mar 4, 2013, 3:26:39 PM. (this is repeated over and over and over)
If I perform a
info <source extract> detail---> I see the following:
Log Read Checkpoint Oracle Redo Logs 2013-03-04 15:26:39 Thread 1, Seqno 0, RBA 0 (why is it showing 0, becuase it can't read the redo, WHY NOT?)
Extract Source BEGIN END
Not Available <today's date> <today's date> (repeat....)
However, if I retreive the Redo Log number and I issue:
alter spe thread 1 extseqno (redo log sequence #)
start spe.
Then it works okay. I have to manually tell it what redo log to begin reading from. Why?
- Jason
Edited by: 924317 on Mar 4, 2013 9:03 AM