I dump a postgresql database on one machine as follows:
sudo -i -u postgres
pg_dump ire --clean --create --format=p > xfer.sql
On a second, private machine, whose database is not exposed to the network, I restore the dump with:
sudo -i -u postgres
psql -U postgres < xfer.sql
This works once, but then any attempt to overwrite the database gets this error message:
ERROR: database "ire" is being accessed by other users
DETAIL: There is 1 other session using the database.
I can easily fix it using e.g. this solution but how can I avoid creating this dangling session in the first place?
Related
I want to take a DB dump from a remote server and then copy this dump to my local.
I tried couple of commands but didn't worked.
Lastly I tried the command below;
pg_dump -h 10.10.10.70 -p 5432 -U postgres -d mydb | gzip > db1.gz
I succesffully take the DB and tried with restore from Pgadmin, it gives;
pg_restore: error: input file appears to be a text format dump. Please use psql
But at this point I can't use psql, I have to use Pgadmin and not sure if I'm able to get successfully DB dump to my local. I mean I can't verify with restore.
How can I take DB dump from remote server to my local?
Thanks!
Use the "custom" format:
pg_dump -F c -h 10.10.10.70 -p 5432 -U postgres -f mydb.dmp mydb
That can be restores with pg_restore and hence with pgAdmin.
You do not have to use pgAdmin. pgAdmin uses pg_restore, and there is nothing that keeps you from using it too.
I have a dump file generated by using pg_dump from a remote database. I am using the file to restore and populate a database using psql.
I did not have the user and database name. I peeked into the sql file and figured out the user and database.
Here are my steps:
1. psql -h <> -u <> -d ( I used the superuser here).
2. created the user as the application needs to access using this user only.
3. changed the owner of the database to the user created in step 2 using Pgadmin.
I am unable to access any tables and getting the error -- ERROR: permission denied for table
Please Help !
Thanks
It is better if you use dump and restore instead of psql for restoring the database.
e.g
e.g suppose you have database dbname_source in remoteDB and dbname_target in localDB then you can use the below commands for dump and restore
./pg_dump -U postgres -p 5432 -h <remote_IP> -Ft dbname_source > dump_of_source.sql.tar
./pg_restore -U postgres -h localhost -p 5432 -d dbname_target dump_of_source.sql.tar
Using pg_dump under an AWS EC2, I want to make a copy of an existing database but under a new database name, potentially on a different instance.
I tried something like this
pg_dump -C --no-owner --no-tablespaces --dbname=eric --host=fs-......eu-central-1.rds.amazonaws.com --port=5432 --username=sa --password | psql -h fs-...SameOrOtherName.eu-central-1.rds.amazonaws.com --port=5432 --username=sa --password --dbname=new_eric
This comes back with the error
"psql: FATAL: database "new_eric" does not exist"
I am trying to avoid generating a pg_dump file, then modifying it, then reloading it...
I suppose I could "sed" to replace some stuff on the fly...?
In SQL Server, I can create a new database on the server from a backup from another box. I can't seem to find that functionality in pgAdmin4 with PostgreSQL10. It seems like all I can do is restore an existing database. Do I need to just create a blank database first?
You can use --create or -C in pg_dump function to make database. From Documentation :
Begin the output with a command to create the database itself and
reconnect to the created database. (With a script of this form, it
doesn't matter which database in the destination installation you
connect to before running the script.)
For syntax :
pg_dump -C -U your_user -d your_db > filename.sql
or
pg_dump --create -U your_user -d your_db > filename.sql
I have a database server without much disk space, so I took a backup of the entire db (let's just call it redblue) and saved it locally using the following command (I don't have pg running on my computer):
ssh admin#w.x.y.z "pg_dump -U postgres redblue -h localhost " \
>> db_backup_redblue.sql
I'd like to now restore it to another server (1.2.3.4) which contains an older version of "redblue" database - however wanted to ask if this is right before I try it:
ssh admin#1.2.3.4 "pg_restore -U postgres -C redblue" \
<< db_backup_redblue.sql
I wasn't sure if I need to do -C with the name of the db or not?
Will the above command overwrite/restore the remote database with the file I have locally?
Thanks!
No, that will do nothing good.
You have to start pg_restore on the machine where the dump is. Actually, since this is a plain format dump, you have to use psql rather than pg_restore:
psql -h 1.2.3.4 -U postgres -d redblue -f db_backup_redblue.sql
That requires that there is already an empty database redblue on the target system.
If you want to replace an existing database, you have to use the --clean and --create options with pg_dump.
If you want to use SSL, you'll have to configure the PostgreSQL server to accept SSL connections, see the documentation.
I'd recommend the “custom” format of pg_dump.
Of course, you can do this :) Assuming you use ssh keys to authorize user from source host to destination host.
On the source host you do the pg_dump, then pipe through ssh to destination host like this:
pg_dump -C nextcloud | ssh -i .ssh/pg_nextcloud_key postgres#192.168.0.54 psql -d template1
Hope that helps ;)