Re: Query

Hi,

As a part of my university project, I am trying to modify the postgres code
to support parallel system.

As the first step I have partitioned the data on different processors. And
have kept a master node to process all the query requests. Whenever my
master node is queried I need to push my query onto the backend processors.
For this I need a way of connect to different backends via my master node's
backend.

I have tried different functions like:
do_connect
SendQuery
PQconnectdb
etc.

But all of them give the same compilation error of not being able to find
the reference to the functions. Now if I include command.o and
common.opresent in src/bin/psql, I get the error of not referencing
other functions.

I there a way of accessing other backends through the master backend.

Thanks & Regards,
Shaunak Godbole

--
It is not the aptitude but the attitude that decides a persons altitude
Shaunak Godbole
Senior Undergraduate
Computer Science Dept.
IIT Powai, Mumbai 400076
Ph no: +91 98695 41960

"Shaunak Godbole" <shaunak(dot)godbole(at)gmail(dot)com> writes:
> I there a way of accessing other backends through the master backend.

It seems you're trying to reinvent contrib/dblink.

regards, tom lane

Ühel kenal päeval, E, 2007-04-09 kell 10:56, kirjutas Tom Lane:
> "Shaunak Godbole" <shaunak(dot)godbole(at)gmail(dot)com> writes:
> > I there a way of accessing other backends through the master backend.
>
> It seems you're trying to reinvent contrib/dblink.

Or you may want to use pl/proxy
( https://developer.skype.com/SkypeGarage/DbProjects/PlProxy ) which can
be used for data partitioning between different hosts/backends if the
interface to data is postgresql functions.

> regards, tom lane
>
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Hi,

As a part of my university project, I am trying to modify the postgres code
to support parallel system.

As the first step I have partitioned the data on different processors. And
have kept a master node to process all the query requests. Whenever my
master node is queried I need to push my query onto the backend processors.
For this I need a way of connect to different backends via my master node's
backend.

I have tried different functions like:
do_connect
SendQuery
PQconnectdb
etc.

But all of them give the same compilation error of not being able to find
the reference to the functions. Now if I include command.o and
common.opresent in src/bin/psql, I get the error of not referencing
other functions.

I there a way of accessing other backends through the master backend.

Thanks & Regards,
Shaunak Godbole

dblink is written specially for remote database access and is efficiently
written for postgresql and is also having async query capabilities, u may
check dblink_connect, dblink_fetch, dblink_exec, dblink_send_query, etc
..... more than that it is also having replication mechanism which u can
achieve using dblink_build_sql_insert, dblink_build_sql_delete,
dblink_build_sql_update which i think would be of utmost help if there is
some replication requirement in ur parallel database system

regards
nags
IIT Bombay
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