| semafore [message #157123] |
Tue, 31 January 2006 07:56  |
risy_s
Messages: 44
Registered: September 2005
Location: Mumbai
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Member |
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hi all
can anybody tall me wat is semafore and what is the purpose?
i have read from some doc that semafore are using for some locking
but this has not clear my doubt..
n why v need shared memory segments is this different from SGA i knw
about SGA but how it is connected to shared memory segments.?
n if possible please provide me some doc. on this.
Thanks
risy
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| Re: semafore [message #157456 is a reply to message #157123] |
Thu, 02 February 2006 08:59  |
smartin
Messages: 1803
Registered: March 2005
Location: Jacksonville, Florida
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Senior Member |
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Concepts guide for sure and possibly Administrators guide go over things like this, especially in the early chapters of the concepts guide on architecture.
Memory can be shared, for example in parsing a query and then other users re-using the same execution plan. When you share memory, you need a way to protect it.
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