Re: performance problem on big tables

2017-08-15 18:13 GMT+02:00 Jeff Janes <jeff(dot)janes(at)gmail(dot)com>:

> On Tue, Aug 15, 2017 at 3:06 AM, Mariel Cherkassky <
> mariel(dot)cherkassky(at)gmail(dot)com> 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
>