Sunday Sep 06, 2009

11gR2 - What is in it for me?

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Wednesday Aug 19, 2009

Partitioning or Backup Tables...?

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Tuesday Aug 18, 2009

Partitioning and/or/with Exadata?

Got a little busy there with all the comments on the Netezza posting, but now we're back into some of the outstanding topics. This post is the next one on discussing some of the ODTUG session questions (see this post). One of the questions was about the use of partitioning and whether it is made obsolete by Exadata off-loading... In other words, should you look at one, the other or both? The answer is that you will want both, and there are a variety of reasons for that. First of all, on the query side you will hopefully be using partitioning (often range partitioning) for partition elimination. From an I/O perspective that looks roughly like this*:
Partition_pruning.JPG
In essence, partition pruning allows you to reduce a 5TB I/O operation to a much smaller I/O operation and therefore much faster return of the information. Compression is something that may or may not be used. In this example we are compressing the data and further reducing the I/O numbers. So far there is nothing new here, with Exadata however you will see a further reduction. After applying a smart scan, both the rows returned (remember Exadata is smart storage and actually knows rows and columns should be returned!) and the columns returned are further reduced. This is on top of partitioning. You will get something like this:
ExadatawithPartition_pruning.JPG
The conclusion from a query and I/O perspective is therefore that you will benefit from both.[Read More]

Wednesday Jul 29, 2009

Class: Optimizer - Good things get even better (Aug 5)

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Sunday Jul 26, 2009

Lock up Your Data Warehouse – Part 2

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Thursday Jul 02, 2009

Lock up your data warehouse - Part 1

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Tuesday Jun 09, 2009

Unloading data using External Table and Data Pump

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Monday May 18, 2009

More on Total Recall for the DW - Use "AS OF" to publish data

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Thursday May 14, 2009

More Exadata Deep Dive Webcasts

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Tuesday May 12, 2009

Total Recall for Data Warehousing

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Tuesday Mar 31, 2009

Supermodels, ETL and Data Mining

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Wednesday Mar 04, 2009

Pivot, extract and more fun SQL stuff

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Wednesday Feb 25, 2009

New External Table Functionality - PreProcessing and Data Pump

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The data warehouse insider is written by the Oracle product management team and sheds lights on all thing data warehousing and big data.

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