Re: C++, Postgres , libpqxx huge query

Hi,

On 2014-05-04 01:57:43 -0700, alexandros_e wrote:
> I have to execute an SQL query to Postgres by the following code. The query
> returns a huge number of rows (40M or more) and has 4 integer fields: When I
> use a workstation with 32Gb everything works but on a 16Gb workstation the
> query is very slow (due to swapping I guess). Is there any way to tell the
> C++ to load rows at batches, without waiting the entire dataset? With Java I
> never had these issues before, due to the probably better JDBC driver.

Try looking into either using a serverside cursor or COPY.

Greetings,

Andres Freund

--
 Andres Freund                       http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services