Is the cache shared between process ?

Hi,
When I set the cachesize to 200MB in each process, does it mean that each process will need 200MB ? Or is there a chance that it will be shared ? As I use PHP scripts in a multi-process environnement to access the database I want to know the consequence on the memory consumption.
thanks

Hi,
The shared memory pool buffer (cache) will be shared between the processes as long as each process correctly specifies the subsystems and uses the same environment (directory):
Shared memory regions
Architecting Transactional Data Store applications
So, the processes will not carve out each a 200MB block of memory. If the processes do not share the same environment, then aside a 200MB per process private block of memory needed, database modifications will be private to each process, leading to inconsistent data, unexpected results and likely core dumps; similar issues would apply to log records, which will be overwritten as the log record buffer will be private, leading to data corruption and failed recovery.
Regards,
Andrei

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tt2

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