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 The old version v1 required the partioning option which required Enterprise Edition, so I re-wrote the collection code to

     1) install on windows as well as UNIX
     2) simplify the code
     3) use “poor mans partitioning”
Poor mans partitioning takes 7 ASH like tables and does a using “union all” to create the view v$active_session_history. This allows me to use truncates instead of deletes when purging data. Truncates are much cheaper than deletes and since alot of data is being collected the option of truncating is important. The collection package on the target inserts into a view on the repository called SASH. The view SASH points to one of 7 base tables SASH1 - SASH7. If there is no purge job running the the table base table will just keep filling up. If the optional job sash_repo.purge is started, then it will change which base table SASH points to (sash1 through sash7). Then every minute, hour or day (configurable) the job switches the view sash to point to the next base table, truncating the base table before the switch so that there is 7 minutes, 7 hours or 7 days of rolling data.

First off the idea and inspiration for ashmasters.com came from John Beresniewicz and Graham Wood, two people I had the privilege to work with at Oracle when redesigning the OEM performance screens in 10g. Both JB and Graham were people who inspired me, kept me sane and mentored me at Oracle. Graham is known as the father of ADDM and JB is man behind most anything worth while you seeing in OEM 10g performance monitoring. The 10g OEM group had a dream design team of Gaja Vaidyanatha, James Morle, John Beresniewicz with Graham helping us out in Server Technologies. The team was only together at the same time for a few months but those few months were probably the most fun I’ve had working with Oracle and I think there was some great improvements in the power and ease of the OEM performance interface that came out of that collaboration (though we all would have liked to have done much more with it). 

I’m constantly indebted to people like Steve Adams, Jonathan Lewis who’s deep understanding , helpful responses and encouraging words have motivated me to go farther.

The list of people who have been a major part of my learning and enjoyment with Oracle goes on and on - Anjo Kolk , Connor McDonald , Julian Dyke, Tim Gorman, Stephan Haisley, Jared Still, Tanel Põder and luckily most of them are in the Oaktable which was the creation from Mogens Nogard who I can’t thank enough.

It’s ironic - there are people who take credit and people who want credit and then there are people who do tons and no one knows about them. The fellow who first introduced me to the wait interface in 1994 (!) not only introduced me to it but showed me how to connect to the SGA directly with C and monitor the sessions almost like ASH but many years ahead of it’s time. No one hardly knows the fellows name - thanks Roger Sanders!

 I want to make contribution via making things simple and harnessing graphics. I admit that some of the central graphical ideas ideas I that I rallied for in the OEM team came from small but pivitol pieces I saw in Quest products. I have since seen many of the ideas brought forth in  OEM 10g showing up in other products on the market. What goes round comes round. Ideas build off ideas. No inventor is an island to themselves. We all build of existing ideas or are inspired by current ideas, but when there is discussion, sharing and community the ideas can grow faster, be more fun and become more powerful.

I’m looking for is work that inspires me and to work with people who share in the inspiration.