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Connor McDonald

Thanks for the question, Sergio.

Asked: October 19, 2017 - 1:56 am UTC

Last updated: October 20, 2017 - 4:31 am UTC

Version: 11.2.0.4

Viewed 1000+ times

You Asked

Hi,

I would like to know if it would it be good practice to create index tablespaces with block size larger than the data tablespace?

Recently, a performance consultant company guided us to maintain indexes on tablespace with block size of 16K, while the tables should be created on tablespaces with block size of 8K. Our database is an 11.2.0.4 enterprise edition. Some of the tables/indexes are very large (more than 1 TB).

The company explained that operations with SELECT acessing indexes would be faster than now.

Would be a valid advice to follow, or would there be a misconception?

Best reggards,

Sergio

and Connor said...

It is *possible* that you might get a benefit, but in my experience it is *extremely* unlikely you'd notice any difference. Extremely :-)

Here's a series of posts about it by Richard Foote. I suggest you pass them on to the performance consultant

https://richardfoote.wordpress.com/2008/03/16/store-indexes-in-a-larger-block-tablespace-some-thoughts-big-brother/

https://richardfoote.wordpress.com/2008/03/18/store-indexes-in-larger-block-size-the-multiblock-read-myth-karma-police/

https://richardfoote.wordpress.com/2008/03/20/store-indexes-in-a-larger-block-tablespace-the-multiblock-read-myth-part-ii-the-fly/

https://richardfoote.wordpress.com/2008/03/26/store-indexes-in-a-larger-block-tablespace-height-reduction-12-myth-five-foot-one/

https://richardfoote.wordpress.com/2008/03/31/larger-block-index-tablespace-and-small-index-scans-performance-improvement-let-down/

https://richardfoote.wordpress.com/2009/02/18/larger-block-tablespace-for-indexes-revisited-part-i-the-tourist/

https://richardfoote.wordpress.com/2009/02/23/larger-block-tablespace-for-indexes-revisted-part-ii-money/

https://richardfoote.wordpress.com/2009/03/02/larger-block-tablespace-for-indexes-revisited-part-iii-prove-yourself/





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