SAP Business Warehouse on The Lars Breddemann Blog

Automatic testing of BW queries, anyone? Here you go!

Wed, 30 Jan 2013 14:00:57 +0000

Dear readers

This time I’m not presenting you any of my own work but instead want to advertise what my CSA colleague Tobias Kaufmann just published here on SCN:

Automatic Test of Queries with RS Trace Tool. (really well done Tobias!)

How most BW performance support messages are solved

Fri, 21 Oct 2011 14:00:15 +0000

As the fourth quarter of the year started everybody seems to check the goals that had been set for this year and what has already been reached. Looking back on the messages I worked on I found a very clear pattern, when the message was about BW on Oracle and performance.

SAP Support case “FOR ALL ENTRIES disaster”

Fri, 12 Aug 2011 14:00:18 +0000

Last week a colleague from the WHM (data warehouse management) support team called me to get some assistance with a customer message he was processing.

The customer complained about short dumps with the infamous “TSV_TNEW_BLOCKS_NO_ROLL_MEMORY” error, which is basically the way an ABAP work process reports that it ran out of memory.

Partition count contest!

Tue, 19 Jul 2011 14:00:03 +0000

Let’s have a contest! #

One of my last blog posts started off a discussion (e.g. Bala posted his thought in a blog) about the importance of the partitioning feature for an SAP BW installation.

Short note on Line Item and High Cardinality dimensions

Fri, 15 Apr 2011 14:00:37 +0000

One of the quotes I like most I learned from Tom Kyte from Oracle. It’s one from Artemus Ward:

" It ain’t so much the things we don’t know that get us into trouble.
It’s the things you know that just ain’t so."

Question to SAP Support “Why is partition pruning not working in my BW on Oracle?”

Thu, 14 Apr 2011 14:00:01 +0000

Welcome to the problem

As usual understanding, the meaning and the scope of the question is key for the answer to this question, recently filed by a customer.

So, what is the customer complaining about? What does he mean by “partition pruning”?

BW/DB Support 101 – Get to know your failing SQL statement

Sat, 26 Feb 2011 14:00:46 +0000

Lately, I’ve been confronted with several customer messages concerning problems with Infocube compression, change runs or roll-ups. For some reason, these standard BW actions, that worked the day before, now started to fail.

Small changes with big effects

Sat, 29 Jan 2011 14:00:56 +0000

For many BW performance relevant DB-features, it’s really all about the details of usage and implementation when it’s about the effect of those features.

The following are two examples of rather small things that went wrong which had a big impact on the system performance.

BW on Oracle: a performance hunch I see more and more often…

Wed, 19 Jan 2011 14:00:02 +0000

Ok, once again reproducing a problem takes a lot of (waiting-)time for the query to finish.

In the meantime I can also just write a super-short-blog post about a pretty common BW-on-Oracle performance hunch: Inappropriate database optimizer statistics. (yes, ‘inappropriate’ not ‘outdated’!)

A first (BW) issue…

Wed, 05 Jan 2011 14:00:47 +0000

In the second week working in BW support, I noticed that there was a problem reported by customers again and again. The customers complained about “database statistics update fails in process chains” or “brconnect run returns errors”. When checking the relevant log file entries for the actions there was always something like

New shores in sight…

Wed, 05 Jan 2011 14:00:13 +0000

As some of you might have noticed, I haven’t been too active in the DB/OS forums lately. This is because I moved on to a new support team and a new subject for me back in September. Yes, I took the giant leap and moved two offices to the right and am now running with the SAP BW support superheroes ;-)

Quick help for ORA-60 deadlock in BW systems

Tue, 28 Dec 2010 14:00:37 +0000

Today I re-learned a nice option to overcome ORA-60 problems with parallel data loading scenarios.

As most of you will know (from reading note “84348 - Oracle-Deadlocks, ORA-00060” or Michael Braunstein’s Blogs Chasing Oracle deadlocks part I - row level locks/ Chasing Oracle deadlocks part II - block level locks or some other resource) the problem here is caused by Oracle space management on block-level.

SAP Support Case “Why is Oracle writing out so many archivelogs in my BI recently?”

Tue, 15 Jun 2010 14:00:46 +0000

Sometimes support messages have to go a rather long way to finally get a solution.

The following problem came up in a support message recently and since neither the analysis steps nor the solution were obvious, I decided to make a blog out of it.