Re: How to exclude blobs (large objects) from being loaded by pg_restore? - Mailing list pgsql-general

On Fri, 1 May 2015 14:12:08 +0000
Alanoly Andrews <alanolya@invera.com> wrote:

> Hello,
>
> We have a database that has been unloaded using pg_dump. This database has a table with a field defined as "lo". When
restoringthis database to another system, we want to avoid loading this particular table as it is very large (about 8GB
ofblob data) and is not needed on the target system. I tried the following: 
> 1.      Create a list of all the tables in the pg_dump file using the -l option of pg_restore
> 2.      Edit out the lines corresponding to the said table (with the "lo" column)
> 3.      Run the pg_restore with the -L option to use the edited list of tables.
>

use the -T option of pg_dump?

http://www.postgresql.org/docs/9.4/static/app-pgdump.html

-T table
--exclude-table=table

Do not dump any tables matching the table pattern.


> I have found that what this does is to exclude only the non-lo fields of the table. So after the load, the table
itselfis not visible in the target system. But the actual blob data does get loaded since they are contained in the
pg_largeobjectsystem table. This table does not occur in the listing produced in step 1 above and so cannot be edited
out.Besides it is a system table and should not be excluded anyway. 
>
> I'd appreciate some input on how I can get the blob data of a specific table to be excluded from a pg_restore. This
isan operation that we need to do on a monthly basis. We do not want to exclude the blobs from the dump itself (since
thewhole database is to be preserved as a monthly record), but only from the restore. 
>
> Postgres 9.1.4 on AIX.
>
> Thanks.
>
> Alanoly Andrews.
> Invera Inc.
> Montreal, Canada.
>
>
>
>
>
>
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