IT Answers » Data warehouse

Data mining and warehousing

masaka — Wed, 01 May 2013 10:44:47 +0000

New Answer by Chris Leonard

BI product

CharlieBrowne — Sat, 16 Feb 2013 19:31:26 +0000

New Discussion Post by WoodEngineer

Teradata Live Webcast: Creating an integrated BI and data warehousing architecture

Michael Tidmarsh — Wed, 12 Sep 2012 17:10:06 +0000

New Discussion Post by brubensteintt

How to speed up AS/400 SQL?

Sloopy — Wed, 08 Jun 2011 08:46:52 +0000

We have SQL on our Data Warehouse written using SHOWCASE. The SQL could be better, it is not SO bad for something writen with a drag and drop gui, but the execution is far too slow – 12 minutes to extract data from the main 3.5 million record file, with several left outer joins.

So, we created indexes on the files, including one on a date (‘yyyymm’, character) field on the main file which was the primary WHERE selection – WHERE MYDATE = ’201103′. According to performance information collected, the query used the index, which should have restricted the selection to roughly one-twelfth of the records. But there was no speed increase whatsoever, and it looked as if all records in the main file were still read.

Pool stats seem fine, DB faults in the run were 2.3 for 2721 pages. The ‘classic’ (slow) SQL engine is not being used, we have prohibited DDS-created logical files. Why is there no effect when valid indexes are created? How can we speed up the runs?

We do intend to look at flattening the data, splitting the big file, other physical rearrangements – but why are indexes not giving any improvement?

Deactivate Storage Unit Management in SAP WM

2626 — Sun, 19 Dec 2010 00:55:04 +0000

How do you deactivate storage unit management in the warehouse? What are the steps? I know that the warehouse record can be deactivated; however, do you transfer su material into non-su managed bins, deactivate the storage type then the warehouse?

Career in datawarehousing or data management?

Smitheshgopal — Tue, 16 Nov 2010 07:39:21 +0000

Hi,

I have [strong]4.5[/strong] years experience as data processing associate. Now I am working as MIS Reporting Assistant. I have good knowldge of Excel. I am a B.Com graduate and I am interested in making a good career in Data warehousing or Data Management. I am planning to do a certificate course in SQL as my currect work demands for SQL and I have started learning SQL on net. Am I [em][strong]academically eligible[/strong] [/em]to make a sound career in Data warehousing or Data Management. If no, please advise me what I should do? (qualifications required for datawarehousing or data management)

Risks of releasing newly developed code to UAT without QA

Satkaur — Fri, 15 Oct 2010 08:35:53 +0000

What are the risks to releasing new developed code to UAT environment for UAT without running it in QA first?

Storage vs Data Warehouse

Dovmhr — Wed, 07 Apr 2010 13:17:58 +0000

would it be correct to paint DW as having 4 layers: Storage, Access, Directory, Analytics? If so what layers would be software and which would be hardware? Thanks!

Performance impact by using GUID instead of sequence as primary key

Jzliao — Tue, 06 Jan 2009 18:46:40 +0000

Is there anyone has experience on using GUID as the primary key in the data model of a huge data warehouse? What is the impact of the performance compare with the sequencial surrogate key in Oracle 10g or higher version?

how to smoke test the data warehouse?

Ktkn — Sat, 04 Oct 2008 02:47:10 +0000

I would like to know what kind of test should be performed to checkout the build and the test environment prior to testing?