Re: setFetchSize()
От | Dmitry Tkach |
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Тема | Re: setFetchSize() |
Дата | |
Msg-id | 3F181067.6000606@openratings.com обсуждение исходный текст |
Ответ на | Re: setFetchSize() (Tom Lane <tgl@sss.pgh.pa.us>) |
Список | pgsql-jdbc |
Tom Lane wrote: >Dave Cramer <Dave@micro-automation.net> writes: > > >>This isn't true any more, the backend supports with hold now, so you can >>declare a cursor outside a transaction >> >> > >However, if the problem is that the query result is too large to hold in >memory, then a WITH HOLD cursor is a terrible solution. You are simply >moving the problem of coping with the fully-materialized query result >out of the client and into the backend. Admittedly the backend is >probably better able to cope than the client (at least it knows how to >spill rows to disk...), but if you are trying to get good performance >on huge result sets you do not want to use a held cursor, any more than >you want to suck the whole result into client memory. > > Aha! That seems to explain those memory problems the other guy (Patric, I think) was complaining about earlier... Dima
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