Tuesday, 22 November 2016

RE: [firebird-support] Re: Best way to delete millions of rows

 

> > @Ann
> > I will run some test and see what happens if the guids are generated
> > in way where the last part varies. Like this:
> > 39db9ec6-178e-77b4-5d7b-d4e969b0cd98
> > 39db9ec6-178e-e4ba-54ed-92347a131663
> > 39db9ec6-178e-c95b-c709-a42e349410df
>
> There would be a lot of advantage, for Firebird, in using this kind of guid?

Yes, Firebird indexes use prefix compression so the leading 14 chars of the above values would be stored under a single entry.

The reality is that UUID/GUID while "universally" unique do have parts which are unique to a source system, so they are common for all UUID/GUID from that system.

Sean

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Posted by: "Leyne, Sean" <Sean@broadviewsoftware.com>
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Visit http://www.firebirdsql.org and click the Documentation item
on the main (top) menu.  Try FAQ and other links from the left-side menu there.

Also search the knowledgebases at http://www.ibphoenix.com/resources/documents/

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