Hi Christo,

My enviroment is like yours:

 MVS V2.1.013 
 DB size= 1440Meg (bigger than yours)
 Bufferpoolsize= 2080k (smaller than yours)
 Cache hit= 99.07%

My approach about this was to give increments (25%) from the default until 
i get this percentage. When my DB grew up i had to tune the buffepoolsize 
too.

Greetings, 
Wilfredo Castillo
Intesa-Venezuela.    

 


__________________________ Separador de respuesta ______________________________
Asunto: Re: ADSM Database Cache Hit Percent 
Autor:  "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>  en INTERNET
Fecha:    29/10/97 4:29 PM


Hi Koen,Debbie,

Our server is MVS V2.1.013 and DB size = 1072Meg
BUFPoolsize = 8192K
Cache Hit Percentage = 99.30%

Has anyone got a clear understanding as to how this 
percentage is calculated?

Thanks 
Christo Heuër
ABSA Group 
Johannesburg
South Africa
E-Mail: christoh AT absa.co DOT za

> Hi Debbie, you're not alone, we also have 2 servers with a bufpoolsize of
> 30720K with a cache hit of 97,59 and 93,08 after a week running. They
have
> databases of 4100M and 7000M. I stopped adding bufpoolsize since the gain
> in cachehit% was minimal, as you pointed out memorysize increases and i
was
> stil inside my backupwindow. To the other persons reacting on this topic
,
> could you please also give your databasesize (just the bufpoolsize is
> meaningles).
> Whit a bufpoolsize of 100k and a database of 1M (bufpool is 10% of
> database) you're cachehit% is a lot better than the same bufpoolsize with
a
> database of 100M (bufpoolsize is 0,1% of database)
> Greetings, Koen.