Question & Answer
Question
What is the maximum value for the IBM® Rational® ClearCase® []dbcheck -p[] option and how setting this value too high can worsen performance?
Answer
Overview
The dbcheck's -p option is the number of pages for vista to allocate to its page cache.
This feature allows you to specify the number of 4 kilobyte pages to cache, thus allocating more memory than dbcheck would use by default. Omitting the -p argument results in dbcheck defaulting to 64 pages (as in dbcheck -p 64).
Improve Performance
This option can positively impact performance as dbcheck processes a potentially multi-gigabyte VOB database. The maximum value usable for -p is 32k minus 1 (32767 bytes).
Degrade Performance
Specifying 32768 (32k) or higher will cause dbcheck to use the max value of 32767, which potentially puts performance behind or below what you would observe by omitting -p altogether.
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Document Information
Modified date:
16 June 2018
UID
swg21121988