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Work Mem Allocation Questions

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1: Is the default work_mem pre-allocated to the Postgres processes - or
does it get allocated when needed?  Say I have work_mem at 30MB - will
Postgres allocate that 30MB on connection, or only when it needed by a
query?

2: If work_mem is, say,  30MB, and my query needs 10MB - will Postgres
allocate all 30MB, or just the 10MB I need?

-- 
Brad Nicholson  416-673-4106
Database Administrator, Afilias Canada Corp.



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