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"dynamic prefetch" or "sequential prefetch

 
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jctgf
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Joined: 05 Nov 2006
Posts: 89
Topics: 36
PostPosted: Thu Aug 27, 2009 9:09 am    Post subject: "dynamic prefetch" or "sequential prefetch Reply with quote
Hi,

I have two versions of a select that produces the same outcome.

Explain says that version 1 causes a "dynamic prefetch" and version 2 causes a "sequential prefetch".

Other than that, the Explain report is identical.

Which version should I choose, please?

Thanks.
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kolusu
Site Admin
Site Admin


Joined: 26 Nov 2002
Posts: 12378
Topics: 75
Location: San Jose
PostPosted: Thu Aug 27, 2009 1:54 pm    Post subject: Reply with quote
jctgf,

Links from google which compares both

http://www.zjournal.com/index.cfm?section=article&aid=1058

http://www.db2-dba.net/articles/Article-Dynamic%20Prefetch.html

http://it.toolbox.com/blogs/db2zos/prefetch-on-prefetch-off-prefetch-on-prefetch-off-prefetch-22464

Kolusu
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