Обсуждение: how to create dump of selected rows from a table

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how to create dump of selected rows from a table

От
anj patnaik
Дата:
Currently, I am running pg_dump on an entire table of a database by doing:

 PGPASSWORD=$PGPASSWORDB /opt/data/PostgreSQL/9.4/bin/pg_dump -t RECORDER -Fc $i -U pguser -Z0 | xz -9 > "$backup_dir/$i-$timeslot-database"

However, this table has a lot of rows.

Is there a way I could do pg_dump on a subset of rows that match a criteria say via a sql statement?

Does anyone have any snippets on how to do that?

Thank you

Re: how to create dump of selected rows from a table

От
Adrian Klaver
Дата:
On 12/17/2015 09:28 AM, anj patnaik wrote:
> Currently, I am running pg_dump on an entire table of a database by doing:
>
>   PGPASSWORD=$PGPASSWORDB /opt/data/PostgreSQL/9.4/bin/pg_dump -t
> RECORDER -Fc $i -U pguser -Z0 | xz -9 > "$backup_dir/$i-$timeslot-database"
>
> However, this table has a lot of rows.
>
> Is there a way I could do pg_dump on a subset of rows that match a
> criteria say via a sql statement?

Yes it is called COPY:):

http://www.postgresql.org/docs/9.4/interactive/sql-copy.html

or its psql equivalent \copy:

http://www.postgresql.org/docs/9.4/interactive/app-psql.html

>
> Does anyone have any snippets on how to do that?
>
> Thank you


--
Adrian Klaver
adrian.klaver@aklaver.com

Re: how to create dump of selected rows from a table

От
Melvin Davidson
Дата:
And to get the structure of a table, you can use
pg_describe_object(catalog_id, object_id, object_sub_id)

On Fri, Dec 18, 2015 at 10:16 AM, Adrian Klaver <adrian.klaver@aklaver.com> wrote:
On 12/17/2015 09:28 AM, anj patnaik wrote:
Currently, I am running pg_dump on an entire table of a database by doing:

  PGPASSWORD=$PGPASSWORDB /opt/data/PostgreSQL/9.4/bin/pg_dump -t
RECORDER -Fc $i -U pguser -Z0 | xz -9 > "$backup_dir/$i-$timeslot-database"

However, this table has a lot of rows.

Is there a way I could do pg_dump on a subset of rows that match a
criteria say via a sql statement?

 Yes it is called COPY:):

http://www.postgresql.org/docs/9.4/interactive/sql-copy.html

or its psql equivalent \copy:

http://www.postgresql.org/docs/9.4/interactive/app-psql.html



Does anyone have any snippets on how to do that?

Thank you


--
Adrian Klaver
adrian.klaver@aklaver.com


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--
Melvin Davidson
I reserve the right to fantasize.  Whether or not you
wish to share my fantasy is entirely up to you.