Re: logical standby
- From: Mark Bole <makbo@xxxxxxxxxxx>
- To: MATT.ADAMS@xxxxxx
- Date: Wed, 14 Sep 2005 07:20:26 -0700
Adams, Matthew (GE Consumer & Industrial) wrote:
I'm in the process of setting up a logical standby databases that will only have a
small portion of the tables in the primary database. (due to disk space constraints).
Oracle 9.2.0.5 on Solaris 8
This is my general plan of attack.
1) create a new empty DB to act as the standby
2) create that tablesapces that will contain the objects we need.
3) run DDL to create empty copies of tables/indexes we want
4) reboot primary to turn on parameters needed for Dataguard
5) shutdown logical standby and restart it, identifying it as a logical standby
6) run the DBMS_LOGSTDBY.INSTANTIATE_TABLE routine for all tables we want
I would appreciate comments on the feasiblity of this approach from anyone that
has tried it before.
I'm pretty sure that will not work. To have a logical standby you need
to build the logminer dictionary on the primary (DBMS_LOGSTDBY.BUILD)
and have it shipped to the standby via SQL Apply (archived redo logs).
The standby must already exist as a hot backup of the primary.
Two choices:
1) stick with your original plan, but call it Streams-based replication
of individual tables and implement it as such.
2) build a true logical standby (assuming you can temporarily get enough
disk space), then use the DBMS_LOGSTDBY.SKIP procedure to skip the
schemas and tables you don't want, and bypass the guard temporarily to
drop all the extra stuff (including tablespaces) that you don't have
room for.
I have done something very similar to (2) on the same platform as yours
and am confident that after a few practice runs, it can work for you.
--
Mark Bole
http://www.bincomputing.com
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