Обсуждение: How to get single table data from backup
Hi!
Large database backup is created using
pg_dump -b -f backup.backup -F c
How to restore single table in schema firma2 from it in Windows?
Created database recovery and tried
pg_restore --schema-only --n firma2 -d recovery backup.backup
pg_restore -n firma2 -t tabletorecover -d recovery backup.backup
This fails since tabletorecover contains lot foreign key references. Foreign keys refer to other tables which have foreign keys to another tables etc. making huge graph. All tables contain also data.
I need to get table data only. Using PostgresSql 17 in windows.
Andrus.
On 12/19/25 04:41, Andrus wrote: > Hi! > > Large database backup is created using > > pg_dump -b -f backup.backup -F c > > How to restore single table in schema firma2 from it in Windows? > > Created database recovery and tried > > pg_restore --schema-only --n firma2 -d recovery backup.backup > pg_restore -n firma2 -t tabletorecover -d recovery backup.backup > > This fails since tabletorecover contains lot foreign key references. > Foreign keys refer to other tables which have foreign keys to another > tables etc. making huge graph. All tables contain also data. > > I need to get table data only. Using PostgresSql 17 in windows. 1) Does the table name tabletorecover occur in more then one SCHEMA? 2) Do you want only the table data for tabletorecover? Assuming 1 is one SCHEMA only and 2 is tabletorecover data only then maybe something like: 1) pg_restore --schema-only --table=tabletorecover -d recovery backup.backup 2) In psql ALTER TABLE tabletorecover DROP CONSTRAINT the FK references in tabletorecover. 3) pg_restore --data-only --table=tabletorecover -d recovery backup.backup > > Andrus. > > -- Adrian Klaver adrian.klaver@aklaver.com
On 19/12/2025 12:41, Andrus wrote: > Hi! > > Large database backup is created using > > pg_dump -b -f backup.backup -F c > > How to restore single table in schema firma2 from it in Windows? > > Created database recovery and tried > > pg_restore --schema-only --n firma2 -d recovery backup.backup > pg_restore -n firma2 -t tabletorecover -d recovery backup.backup > > This fails since tabletorecover contains lot foreign key references. > Foreign keys refer to other tables which have foreign keys to another > tables etc. making huge graph. All tables contain also data. > I haven't tried it, but - off the top of my head - how about: (i) Create the table separately by hand, without the FK references. (ii) Do a data-only restore, using the -a and -t options to pg_restore Ray. > I need to get table data only. Using PostgresSql 17 in windows. > > Andrus. > > -- Ray O'Donnell // Galway // Ireland ray@rodonnell.ie
On 12/19/25 08:12, Adrian Klaver wrote: > On 12/19/25 04:41, Andrus wrote: >> Hi! >> >> Large database backup is created using >> >> pg_dump -b -f backup.backup -F c >> >> How to restore single table in schema firma2 from it in Windows? >> >> Created database recovery and tried >> >> pg_restore --schema-only --n firma2 -d recovery backup.backup >> pg_restore -n firma2 -t tabletorecover -d recovery backup.backup >> >> This fails since tabletorecover contains lot foreign key references. >> Foreign keys refer to other tables which have foreign keys to another >> tables etc. making huge graph. All tables contain also data. >> >> I need to get table data only. Using PostgresSql 17 in windows. > > 1) Does the table name tabletorecover occur in more then one SCHEMA? > > 2) Do you want only the table data for tabletorecover? > > Assuming 1 is one SCHEMA only and 2 is tabletorecover data only then > maybe something like: > > 1) pg_restore --schema-only --table=tabletorecover -d recovery > backup.backup > > 2) In psql ALTER TABLE tabletorecover DROP CONSTRAINT the FK references > in tabletorecover. > > 3) pg_restore --data-only --table=tabletorecover -d recovery backup.backup > An alternate method: 1) pg_restore --table=tabletorecover --file recovery.sql backup.backup Here you are restoring the table structure and data to a text file. 2) Open the text file and remove the FK references from the table definition. 3) Then do psql -f recovery.sql -d recovery If the amount of data is large and you don't want to deal with that in a text file then in step 1 add --schema to get just the table definition. Then do pg_restore --data-only --table=tabletorecover -d recovery backup.backup as step 4. >> >> Andrus. >> >> > > -- Adrian Klaver adrian.klaver@aklaver.com
## Andrus (kobruleht2@hot.ee): > This fails since tabletorecover contains lot foreign key references. Check pg_restore options "--section=pre-data" and "--section=data" - pre-data is the schema without indexes, contraints, etc. (those would be in section post-data). Regards, Christoph -- Spare Space
Hi!
Geat answer since doesnt require manual sql editing. It worked.
Thank you.
Andrus.
19.12.2025 19:05 Christoph Moench-Tegeder kirjutas:
## Andrus (kobruleht2@hot.ee):This fails since tabletorecover contains lot foreign key references.Check pg_restore options "--section=pre-data" and "--section=data" - pre-data is the schema without indexes, contraints, etc. (those would be in section post-data). Regards, Christoph