Re: Memory leaks in PostgreSQL ODBC driver

mlw wrote:
>
> Hiroshi Inoue wrote:
> >
> > mlw wrote:
> > >
> > > mlw wrote:
> > > >
> > > > It seems that when you perform a large query against the
> > > > postgresql ODBC driver it sucks it all in to memory. If
> > > > the query returns more data than you have memory, it fails.
> > > > To change this behavior, you set UseDeclareFetch to yes.
> >
> > Your report is all about UseDeclareFetch mode ?
> > If so, I would examine it.
>
> After spending some time and getting real friendly with the ODBC
> driver, I have
> come to realize what I was seeing was not a memory leak, exactly,
> but a misunderstanding about how it should work.
>
> My expectation is that if I use UseDeclareFetch mode with a
> FORWRD_ONLY cursor, previous results are lost as new results
> are obtained. I believe the PostgreSQL ODBC driver is in error,
> because even with UseDeclareFetch, and a FORWARD_ONLY cursor,
> the previous results are not freed, thus preventing the ODBC
> driver from querying data sources which can provide more data
> than can fit in available RAM.
>
> Is this not correct?

Maybe you are right.
The snapshot dll at my page would fix one of the causes.

regards,
Hiroshi Inoue
http://w2422.nsk.ne.jp/~inoue/