Re: performance problem on big tables

[Pavel Stehule <pavel.stehule@xxxxxxxxx>]

2017-08-15 18:13 GMT+02:00 Jeff Janes <jeff.janes@xxxxxxxxx>:

On Tue, Aug 15, 2017 at 3:06 AM, Mariel Cherkassky <mariel.cherkassky@xxxxxxxxx> wrote:

Hi,

So I I run the cheks that jeff mentioned :  

\copy (select * from oracle_remote_table) to /tmp/tmp with binary - 1 hour and 35 minutes

\copy local_postresql_table from /tmp/tmp with binary - Didnt run because the remote oracle database is currently under maintenance work.

The "\copy...from" doesn't depend on oracle, it would be only depend on local file system (/tmp/tmp), provided that the "\copy...to" finished.  Anyway, given the length of time it took, I think you can conclude the bottleneck is in oracle_fdw itself, or in Oracle, or the network.

dumping from Oracle is not fast - I seen it when oracle_fdw or ora2pg cases.

Regards

Pavel

 

Cheers,

Jeff