Re: libpq, PQexecPrepared, data size sent to FE vs. FETCH_COUNT - Mailing list pgsql-hackers

Alex Goncharov wrote:
> ,--- I/Alex (Mon, 24 May 2010 12:25:18 -0400) ----*
> | No equivalent of FETCH_COUNT is available at the libpq level, so I
> | assume that the interface I am using is smart enough not to send
> | gigabytes of data to FE.
> | 
> | Where does the result set (GBs of data) reside after I call
> | PQexecPrepared?  On BE, I hope?
>
> Sorry for asking again...
>
> No sarcasm meant: is there no straightforward answer here?  Or nobody
> is certain?  Or a wrong list?
>   
The straighforward answer is that the libpq frontend c-library does not 
support something like the JDBC client's setFetchSize.

The GBs of data are gathered at the site of the libpq client (pgresult 
object gathered/allocated while consuming result input from backend).

regards,
Yeb Havinga