Обсуждение: Need help on how to backup a table

 Hi all,
  I am trying to backup a large table with about 6 million rows. I want to
export the data from the table and be able to import it into another table
on a different database server (from pgsql 8.1 to 8.2). I need to export the
data through SQL query 'cause I want to do a gradual backup.
  Does pgsql have a facility for this?
  Thanks in advance for your reply.

   Victor
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CAJ CAJ wrote:
>
>
> Have you looked at "pg_dump -t"
> http://www.postgresql.org/docs/8.2/static/app-pgdump.html
>
> Joey
>
>

 Thanks for quick response but "pg_dump" does not allow me to dump from a
SQL SELECT query which is what I wanna do.

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CAJ CAJ wrote: 

Have you looked at "pg_dump -t"
http://www.postgresql.org/docs/8.2/static/app-pgdump.html

Joey

   

 Thanks for quick response but "pg_dump" does not allow me to dump from a
SQL SELECT query which is what I wanna do.
 

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Thanks all. The COPY command seems to do the work.
One more thing, say I want the data dumped on a remote machine rather than
on the current machine, how would I do that without having to first dump it
on the local machine then uploading to the remote machine?
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ajcity wrote:
> Thanks all. The COPY command seems to do the work.
> One more thing, say I want the data dumped on a remote machine rather than
> on the current machine, how would I do that without having to first dump it
> on the local machine then uploading to the remote machine?
>

Install psql client on that other m/c and fire command psql -c "copy
...." from there :)
ofcourse with proper pg_hba.conf

With regards
Ashish



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If I wanted to use that with a command like "COPY (SELECT * FROM country
WHERE country_name LIKE 'A%') TO '<filename>'; " do I specify the file
location for the remote machine as the <filename> or do I specify the
location for local machine?
 And what if the psql clients are different (local: 8.1.5  remote:8.2.6)?

  Thanks
  Victor

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am  Fri, dem 28.03.2008, um  2:08:17 -0700 mailte ajcity folgendes:
>
>
> If I wanted to use that with a command like "COPY (SELECT * FROM country
> WHERE country_name LIKE 'A%') TO '<filename>'; " do I specify the file
> location for the remote machine as the <filename> or do I specify the
> location for local machine?

Local file systems, and the user postgres needs write-access. I'm using
/tmp/... for such.
And yes: COPY from a select works only for 8.2 up, not for 8.1. Create a
table via 'create table as select ...' and COPY this table.


>  And what if the psql clients are different (local: 8.1.5  remote:8.2.6)?

no matter


Andreas
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ajcity wrote:
> If I wanted to use that with a command like "COPY (SELECT * FROM country
> WHERE country_name LIKE 'A%') TO '<filename>'; " do I specify the file
> location for the remote machine as the <filename> or do I specify the
> location for local machine?
>  And what if the psql clients are different (local: 8.1.5  remote:8.2.6)?
>
>   Thanks
>   Victor
>
>

from remote m/c
psql -h some_hostname -c "copy temp to stdout" -Upostgres postgres >
temp.txt

Will create temp file on the m/c from which u r firing the command .

With regards
Ashish

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Local file systems, and the user postgres needs write-access. I'm using
/tmp/... for such.
And yes: COPY from a select works only for 8.2 up, not for 8.1. Create a
table via 'create table as select ...' and COPY this table.



I'm trying to avoid exporting to the local machine before uploading to the
remote machine; I wanna just run it from the remote machine and have the
data on the remote machine once its done. Is there a way to do this?

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am  Fri, dem 28.03.2008, um  3:01:43 -0700 mailte ajcity folgendes:
>
>
>
>
> Local file systems, and the user postgres needs write-access. I'm using
> /tmp/... for such.
> And yes: COPY from a select works only for 8.2 up, not for 8.1. Create a
> table via 'create table as select ...' and COPY this table.
>
>
>
> I'm trying to avoid exporting to the local machine before uploading to the
> remote machine; I wanna just run it from the remote machine and have the
> data on the remote machine once its done. Is there a way to do this?

Without quote-sign it's hard to understand, who has written what.

Okay, you can mount the remote-filesystem over the network on the
server, is this a option for you?


Andreas
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>  Hi all,
>   I am trying to backup a large table with about 6 million rows. I want
> to
> export the data from the table and be able to import it into another
> table
> on a different database server (from pgsql 8.1 to 8.2). I need to
> export the
> data through SQL query 'cause I want to do a gradual backup.
>   Does pgsql have a facility for this?
>   Thanks in advance for your reply.
>

Here's an easy solution:

psql -c "COPY command here" dbname | ssh user@host.net "dd
of=/path/tbl.backup"

You can run this from your local server, and immediately pipe it over
a secure shell to the other server, and write it to a file there.
The /path/ you specify is local to the remote server.

ashish-21 wrote:
>
> ajcity wrote:
>> If I wanted to use that with a command like "COPY (SELECT * FROM country
>> WHERE country_name LIKE 'A%') TO '<filename>'; " do I specify the file
>> location for the remote machine as the <filename> or do I specify the
>> location for local machine?
>>  And what if the psql clients are different (local: 8.1.5  remote:8.2.6)?
>>
>>   Thanks
>>   Victor
>>
>>
>
> from remote m/c
> psql -h some_hostname -c "copy temp to stdout" -Upostgres postgres >
> temp.txt
>
> Will create temp file on the m/c from which u r firing the command .
>
> With regards
> Ashish
>
>

  Thanks all
   I tried this option and it worked PERFECTLY.
   Thanks every body.

   Victor

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