Re: Firebird 1.0 released - Mailing list pgsql-hackers

From Denis Perchine
Subject Re: Firebird 1.0 released
Date
Msg-id 200204160714.17453.dyp@perchine.com
Whole thread Raw
In response to Firebird 1.0 released  ("Christopher Kings-Lynne" <chriskl@familyhealth.com.au>)
Responses Re: Firebird 1.0 released  (Tom Lane <tgl@sss.pgh.pa.us>)
List pgsql-hackers
Hi,

I was interested in this:
Firebird's indexes are very dense because they compress both the prefix and 
the suffix of each key. Suffix compression is simply the elimination of 
trailing blanks or zeros, depending on the data type. Suffix compression is 
performed on each segment of a segmented key. Prefix compression removes the 
leading bytes that match the previous key. Thus a duplicate value has no key 
stored at all. Dense storage in indexes minimizes the depth of the btrees, 
eliminating the advantage of other index types for most data.

Do we do this? How feasible is this?

On Tuesday 16 April 2002 00:35, Christopher Kings-Lynne wrote:
> The Firebird guys have gotten around to releasing 1.0.  If you read this
> front page spiel, you'll notice that they use MVCC, but with an overwriting
> storage manager.

--
Denis



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