Comments on: Is data warehousing now all about sequential access? http://www.dbms2.com/2006/09/19/is-data-warehousing-now-all-about-sequential-access/ Choices in data management and analysis Sat, 17 May 2008 05:54:47 +0000 http://wordpress.org/?v=2.5 By: Linux 2.6 Kernel I/O Schedulers for Oracle Data Warehousing: Part I « The Oracle Sponge http://www.dbms2.com/2006/09/19/is-data-warehousing-now-all-about-sequential-access/#comment-8259 Linux 2.6 Kernel I/O Schedulers for Oracle Data Warehousing: Part I « The Oracle Sponge Fri, 29 Sep 2006 02:47:47 +0000 http://www.dbms2.com/2006/09/19/is-data-warehousing-now-all-about-sequential-access/#comment-8259 [...] This issue popped back into my head after being directed through Log Buffer #11 at Mark Rittman’s site to an article by Curt Monash titled “Is data warehousing all about sequential access?” and which matched my thoughts very well. [...] […] This issue popped back into my head after being directed through Log Buffer #11 at Mark Rittman’s site to an article by Curt Monash titled “Is data warehousing all about sequential access?” and which matched my thoughts very well. […]

]]> By: David Aldridge http://www.dbms2.com/2006/09/19/is-data-warehousing-now-all-about-sequential-access/#comment-7650 David Aldridge Mon, 25 Sep 2006 21:52:08 +0000 http://www.dbms2.com/2006/09/19/is-data-warehousing-now-all-about-sequential-access/#comment-7650 I'm absolutely behind anything that will supress disk head latency as a factor in data warehouse performance. In fact I wrote something on the subject something over a year ago. http://oraclesponge.wordpress.com/2005/07/25/time-slicing-of-disk-io/ I suppose that the vendors are still having trouble grasping the inherently different nature of data warehouses to the small-and-random i/o model that OLTP generates. I’m absolutely behind anything that will supress disk head latency as a factor in data warehouse performance. In fact I wrote something on the subject something over a year ago. http://oraclesponge.wordpress.com/2005/07/25/time-slicing-of-disk-io/

I suppose that the vendors are still having trouble grasping the inherently different nature of data warehouses to the small-and-random i/o model that OLTP generates.

]]> By: DBMS2 — DataBase Management System Services»Blog Archive » I say “sequential”, you say … http://www.dbms2.com/2006/09/19/is-data-warehousing-now-all-about-sequential-access/#comment-6715 DBMS2 — DataBase Management System Services»Blog Archive » I say “sequential”, you say … Wed, 20 Sep 2006 21:52:16 +0000 http://www.dbms2.com/2006/09/19/is-data-warehousing-now-all-about-sequential-access/#comment-6715 [...] I talked with Teradata today, and they called me on my use of the term “sequential.” Basically, if there’s any head movement for disk seeks, some computer science researchers wouldn’t call it “sequential.” I didn’t know that; I was just familiar with the less precise usage of the term in some vendors’ marketing and discussions.* OK, I’ll make up a new, more precise term instead. How about “coarse-grained”? [...] […] I talked with Teradata today, and they called me on my use of the term “sequential.” Basically, if there’s any head movement for disk seeks, some computer science researchers wouldn’t call it “sequential.” I didn’t know that; I was just familiar with the less precise usage of the term in some vendors’ marketing and discussions.* OK, I’ll make up a new, more precise term instead. How about “coarse-grained”? […]

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