At 02:36 PM 2008-02-08, Roy Brown wrote:
If accessed heavily, yes.
Increasing capacity as I recommended should reduce %secondaries as
well as max. blocks.
>Not true, surely? Every DBGET is nearly one-and-a-half DBGETs,
>compared with a well-distributed master. That will slow things down,
>not just for this master, but for every detail access using it for
>the chain head.
>
>And it's certainly true that every pointer is crossing a block
>boundary, hence the Ineff of 100%. So, yes, up the block factor. How
>big is a record?
>
>Your analysis doesn't show what the Search Filed and Type is; it's
>not binary, is it?
>
>But under 'Master Dataset Solutions', the HowMessy manual says:
>
>"If secondaries are over 30% and inefficient pointers are over 50%,
>the dataset is either too full or not hashing properly. Increase
>capacity to a higher odd number, or change the data type and format
>of the search field.
>
>Increasing block factor should reduce inefficient pointers.!
>
>Both these prescriptions apply to the figures you give.
>
>Roy
>
>>At 01:20 PM 2008-02-08, Jim Phillips wrote:
>>>So, I ran Howmessy on the main data base here and the very first
>>>data set looks very suspicious. The report for this manual master
>>>shows 78% full (19381 entries, 24859 capacity), 30.3% secondaries,
>>>maximum blocks=190, blocking factor=1, maximum chain=7, average
>>>chain=1.43, standard deviation=.70, expanded blocks=1.43, average
>>>blocks=2.30, elongation=1.60 and, are you ready for this,
>>>inefficient pointers=100%!
>>>
>>> My first thought was to increase the blocking factor (my
>>> thinking is with a blocking factor of 1, every pointer must cross
>>> a block boundary). I could also increase the capacity somewhat to
>>> get the load factor down to 70% or so.
>>>
>>> What does this august group recommend?
>>>
>>> Jim
>>>
>>>
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>>
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>>-------------------------
>>Gilles Schipper
>>GSA Inc.
>>HP System Administration Specialists
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>--
>Roy Brown 'Have nothing in your houses that you do not know to be
>Kelmscott Ltd useful, or believe to be beautiful' William Morris
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-------------------------------------------------------------------------------------------------
Gilles Schipper
GSA Inc.
HP System Administration Specialists
300 John Street, Box 87651 Thornhill, ON Canada L3T 7R4
Voice: 905.889.3000 Fax: 905.889.3001
email: [log in to unmask] web: http://www.gsainc.com
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