postgres-xc-general Mailing List for Postgres-XC

Hello,

----- Original Message ----- 
From: "Koichi Suzuki" <koi...@gm...>
> If table is distributed, statements will be decomposed to smaller
> pieces to run at each node and they will be executed in parallel.
> Now our evaluation is more concentrated on running as many (small)
> transactions in parallel, we've not evaluated parallel query
> performance yet and there might be something we need to improve.
>
> Unfortunately, foreign tables are not supported yet.

Great. I wish parallel queries will be able to handle foreign tables. If 
multiple Postgres-XC nodes can scan different parts of a large file on 
Hadoop through a foreign table, it will be a better tool than Hive.

Regards
MauMau

HI,

If table is distributed, statements will be decomposed to smaller
pieces to run at each node and they will be executed in parallel.
Now our evaluation is more concentrated on running as many (small)
transactions in parallel, we've not evaluated parallel query
performance yet and there might be something we need to improve.

Unfortunately, foreign tables are not supported yet.

Regards;
----------
Koichi Suzuki



2011/12/30 MauMau <mau...@gm...>:
> Hello,
>
> I'm very interested in the evolution of Postgres-XC as a data warehouse
> infrastructure. Thank you for your great job. Please let me ask you some
> questions.
>
> 1.What kind of SELECT statements does the current Postgres-XC process in
> parallel on multiple nodes? I mean I'd like to know if a single query can be
> broken into pieces and processed in parallel on different nodes. To be more
> concrete, does the following simple query become faster as the number of
> nodes increases?
>
> SELECT SUM(some_column) FROM some_table [WHERE ...];
>
> 2.Does the foreign table feature of PostgreSQL 9.1 work with Postgres-XC? If
> it doesn't currently, do you have any plan?
>
> Regards
> MauMau
>
>
>
>
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Hello,

I'm very interested in the evolution of Postgres-XC as a data warehouse 
infrastructure. Thank you for your great job. Please let me ask you some 
questions.

1.What kind of SELECT statements does the current Postgres-XC process in 
parallel on multiple nodes? I mean I'd like to know if a single query can be 
broken into pieces and processed in parallel on different nodes. To be more 
concrete, does the following simple query become faster as the number of 
nodes increases?

SELECT SUM(some_column) FROM some_table [WHERE ...];

2.Does the foreign table feature of PostgreSQL 9.1 work with Postgres-XC? If 
it doesn't currently, do you have any plan?

Regards
MauMau