Monday Aug 02, 2010

Partition Wise Joins III – REF Partitioning

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Monday Jul 19, 2010

The ODTUG aftermath… (hadoop, partitions and best practices)

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Tuesday Jun 08, 2010

Partition Wise Joins II

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Thursday Dec 03, 2009

Increase Performance while Reducing Cost

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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]

Friday Apr 10, 2009

Compressing Individual Partitions in the warehouse

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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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