dbc_max_pct & dbc_min_pct

[Vinod Kumar Yadav]

Hi Expert,


What is the use of dbc_max_pct & dbc_min_pct



Regards
Vinod

[rariasn]

http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=1339118

rgs.

[Steven E. Protter · Accepted solution]

Shalom,

These control the buffer cache (bc of dbc). Percentage of memory.

Depending on how you use your system you will want to probably fix these numbers. When an HP-UX system changes its buffer cache, the cost in resources is enormous.

For Oracle systems which normally do not benefit from buffer cache, I set the number to both figure to 5%.

If my applications benefit, I set it higher.

This is the opposite of Linux which moves resources in and out of buffer cache with virtually no performance penalty.

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