postgres-xc-general Mailing List for Postgres-XC

>
> You just need commodity INTEL server runnign Linux.

Are INTEL cpu required ? If not INTEL can be removed ? (also running typo)

For data­warehouse

applications, you may need separate patch which devides complexed query
> into smaller

chunks which run in datanodes in parallel.    StormDB will provide such
> patche.

Wasn't stormdb bought by another company ? Is there an opensource
alternative ? Fix the "patche" typo ?

A way to make it simpler is by merging coordinator and datanode into 1 and
making it possible for a 'node' to not hold data (be a coordinator only),
like in elastic-search, but you probably already know that.

What exact things does the gtm-proxy do? For example, a single row insert
wouldn't need the gtm (coordinator just inserts it to the right
data-node)(asumming no sequences, since for that the gtm is needed)?

If multiple tables are sharded on the same key (example: user_id). Will all
the rows, from the same user in different tables be in the same data-node ?








On Fri, May 2, 2014 at 10:43 AM, Koichi Suzuki <koi...@gm...>wrote:

> Hello;
>
> Because there are many discussions here on Postgres-XC configuration
> and operation, I drafted a paper "Pgcx_ctl primer" to provide how to
> configure Postgres-XC cluster and how to operate it.
>
> https://sourceforge.net/projects/postgres-xc/files/Pgxc_ctl_primer/?
> contains the document.
>
> Hope to have feedback on it.
>
> Regards;
> ---
> Koichi Suzuki
>
>
> ------------------------------------------------------------------------------
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>

Hi Koichi,

I tried to follow the steps removing datanode slave and adding it again but
i no success. even earlier only datanode slave was not working but now gtm
slave, gtm_pxy2, coord2 and dn_slave is not starting up. I have removed GTM
slave and datanode slave

here is my current status of pgxc
PGXC monitor all
Running: gtm master
Running: gtm proxy gtm_pxy1
Not running: gtm proxy gtm_pxy2
Running: coordinator master coord1
Not running: coordinator master coord2
Running: datanode master datanode1

Now each time i have to connect on db02 only( i.e PGXC Psql -h db02 -d
mydatabase) but its not allowing me to modify table structure. and giving
me below error.

mydatabase=#  alter table invoice_summary_data add countrycode text not
null default ''::character(1);
ERROR:  Failed to get pooled connections
CONTEXT:  SQL statement "EXECUTE DIRECT ON (coord2) 'SELECT
pg_catalog.pg_try_advisory_xact_lock_shared(65535, 0)'"

So as of now i am planning to remove those components which are not working
(gtm_pxy2,coord2 ). so it will not go to connect cood2 which is down.

what will be the impact of this, i don't want to loost database access
completely.

Please suggest.

Regards
Juned Khan