Question

Extracting DDL from redo log stream

Asked by: chedgey

Hi guys,

This is not really my area so I was wondering if any of you guys had ever heard of this. One of the chaps in the office says he remembers hearing about extracting DDL statements directly from the redo log stream without using LogMiner. Is this possible?

My situation is that we have a real-time 24x7 operation supported buy an Oracle database (soon to be upgraded to 10g) on AIX. This supports very fast read actions as it is attached to a series of mail sorting machines at a mail centre which require query response in 100milliseconds. I need to extract large amounts of data from this database for a highly configurable transport to a data warehouse that will most likely be SQL Server 2005 based (unless Oracle decide to upgrade their BI offerings and package them free with the database).

Obviously I can do this with DataGuard (or even Oracle Streams) as we use that successfully already in some of our non real-time applications but that would entail creating a secondary AIX based database that would then send the data over to SQL Server. If I could extract the DDL directly from the redo stream then I could pass that directly to be interpreted by SQL Server but I can find no reference to doing it without the use of LogMiner.

NOTE: I cannot run extraction directly on the Oracle database as it is a third party application and we are not allowed to touch it else it invalidates all their SLAs and gives them a "get out of gaol free card" should their application fail. We are, however, allowed to use it's redo stream, hence the peculiarity of my scenario.

Many thanks in advance.

Regards

chedgey

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Asked On
2007-02-07 at 07:52:35ID22153174
Tags

ddl

,

extract

,

oracle

,

log

,

redo

Topic

Oracle Database

Participating Experts
1
Points
500
Comments
5

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Answers

 

by: schwertnerPosted on 2007-02-08 at 05:17:59ID: 18493261

I am afraid only LogMiner can help you.
major changes like creating Tablespaces and Datafiles are logged in
alert log, but minor DDL like CREATE TABLE, DROP TABLE are logged only
in the redo logs.

 

by: chedgeyPosted on 2007-02-08 at 05:35:55ID: 18493381

Hi Schwertner,

thanks for the reply. As an addendum do you know if it is possible to extract the DML from the redo logs without using Log Miner?

Many thanks

chedgey

 

by: schwertnerPosted on 2007-02-08 at 07:42:17ID: 18494468

I think not. May be other that have more experience will share experience.

20120131-EE-VQP-002

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