Trying to exclude a particular table alone during postgres backup. Is there something similar in pgbackrest like pg_dump
pg_dump --exclude-table-data=ex_table demodb
I have not found such option in pbBackRest and that is expected because it's a physical backup tool and not a logical backup tool like pg_dump.
Related
Im currently using the tool pg_dump to backup my database.
I have a lot of database. I don't know their full name but I know that all DATABASES have a well defined prefix.
I would like to automate the process of backup all my DATABASES, however, i have not found a way to specify pg_dump to dump multiple DATABASE that have the same prefix.
I said database and not table nor schema, because I tried the commands in the pgsql doc which gives the options -n for schemas and -t for tables.
But that's not what I want to do, I want to save all my databases with a defined prefix.
Any help in this matter would be greatly appreciated
I have two postgres databases on the same server, a live one and another one which I use as a test database.
Periodically I need to copy my live database (both structure of the tables and their data) into the test one, but everything I've found online only copies table by table. Since I often create new tables in my live db I can't do this, otherwise I'd have to update the job every time.
Anybody knows how can I pull the whole live postgres db into the test postgres one?
Thanks!
You want to use pg_dump and pg_restore.
Example usage would be:
$ pg_dump -Fc <database_name> > dumpfile
$ pg_restore <another_database_name> < dumpfile
If you want to do this for all database you might want to consider pg_dumpall
A bit more can be found in https://www.postgresql.org/docs/current/backup-dump.html
We are about to upgrade from pgsql 9.3 to 10.x. Part of the requirement is to be able to switch back to 9.3 in the case of some disaster (some massive but of course, unlikely incompatibility).
I tried pg_restoring a dump taken from one of our dev v. 10.x databases to a pgsql9.3 server, and got a lot of errors.
Is there any known "roll back path" from v 10.x to v 9.3?
Actually you can use Pg_Dump will give you a full sql file including all DDL and DML statements to recreate your database in another place (or restore).
You can do statement in cmd for backup use Pg_Dump
pg_dump -U username -d database > filename.sql
For more documentation and command use you can see here Pg_Dump
And you can restore use Psql command like this
psql -U username -d database -f filename.sql
You can use the pg_dump from pg9.3 to backup the pg10 database. Then use that backup and pg_restore from pg9.3 again to restore.
I want to get a full backup of postgres 9.6. Including the users and permissions. However I want to exclude some tables. In pg_dump there is an option for excluding some tables (-T). However in pg_dumpall there are no such options.
Is there a way for getting a backup like this in a single command? Or should I get pg_dumpall (without tables) and pg_dump with -T? However in the second scenario these two dumps are not completely synchronised.
You'll have to use pg_dumpall -g and pg_dump -T.
True, the dumps will not share a single snapshot, but unless you add, modify or delete users and tablespaces very frequently, that should not be a problem in practice.
I have backups of my postgres database - the entire database instance in a single nightly backup. Is it possible to restore just one of the database from within that backup? Or if I want to access individual databases (for migration or restoring), do I need to change my database backup scheme to do individual dumps?
You can access individual databases from a full database cluster dump in text format (pg_dumpall) by using some text processing like this:
awk '/^\\connect database_name/ {flag=1;print;next}
/^\\connect/ {flag=0}
flag { print }' \
< all_databases.sql \
> database_name.sql
This would get from pg_dumpall file everything between "\connect database_name" and next "\connect". But it is not very efficient.
But I'd recommend dumping every database separately like this:
# Dumping global data (for example roles)
pg_dumpall -g > /var/lib/pgsql/backups/globals.sql
#Dumping indidual databases in tar (uncompressed binary) format
for dbname in
`
psql -qXtc "
select datname from pg_catalog.pg_database
where datname<>'template0'" template1
`
do
pg_dump -b -F t "$dbname" > "/var/lib/pgsql/backups/$dbname.dump"
done
I'm assuming you mean "Can I restore just one database from a pg_dumpall of the entire database cluster?"
Yes, if your backup is "an archive created by pg_dump in one of the non-plain-text formats." - use the "--schema=" option to pg_restore.
On the other hand I'm not sure you're using the correct terminology here - you refer to a DB cluster as "entire database instance"; in the explanation you ask about "database" but in the title you wrote "schema", etc.
Edit: Now, after some deliberation, I believe you have a cluster backup, created with "pg_dumpall". "pg_dumpall" creates only plain-text (SQL-commands) backups. In that case it's not possible to restore only one database (or only one schema from a database).
Then yes, you need to change your backup procedure to backup individual databases using non-plain-text format (--format=custom is the recommended one).
Actually the backup procedure I use on my DB servers does just that.