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
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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
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've seen the mongodump command used to export a specific database, but how can I find the name of the available databases before choosing one?
To confirm, is this correct?
mongodump -d <database_name> -o <directory_backup>
Also, what effect will the command alone, without any flags, have if run on the database? Thanks!
You can show the databases available with
show dbs
If you do not specify a database it will dump all databases.
https://docs.mongodb.com/manual/reference/program/mongodump/#cmdoption--db
I have a database which I have several tables (including some data) and functions on. I created these tables and functions from the command line interface.
My question is: Is there any way to have my database queries back which creates the same tables/functions again in a readable format.
PostgreSQL version: 9.1.9
pg_dump --schema-only my_database > my_database.sql
http://www.postgresql.org/docs/current/static/app-pgdump.html
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.