I'm using pgAdmin to restore PostgreSQL database. To restore the database I need to delete, drop and remake it. How to restore the database without deleting and remaking it?
This cannot be done in pgAdmin or with any database tools. Regular backup files cannot be restored without deleting the data first because they consist of normal COPY statements which will fail if you have rows in the database (primary keys collide etc).
For a simple way to get back to an earlier snapshot in a testing environment take a look at PostgreSQL documentation - 24.2. File System Level Backup:
For backup:
Shut down your database
copy all the files from your data directory
For restore:
Shut down your database
replace your data directory with the backup directory
Note:
the size of the data might be significantly larger than with a regular backup especially if you have a lot of indexes
this is a server wide backup so you can't do this on individual databases
don't attempt to use it on a different version of PostgreSQL
this really deletes the data too - by replacing it with the backup
Also with regular backups you don't have to do a DROP TABLE if you do a data-only restore with pg_restore --data-only for example. You still have to delete the data though.
Related
I have taken full backup of postgresql database which consists of 100 databases. The backup format is .sql (eg pg_dumpall.exe -U postgres > D:\Backup\fullbkp.sql) now one of my database got crashed and I want to extract this file to get that database backup only for restoration.
I have searched a lot but couldn't find any way to decompress so that I can get that particular database from full backup file.
Please suggest !!!!
Regards
Sadam
Such a backup is not compressed. Also, it contains a backup of all databases in th cluster, and there is no easy way to extract a single database.
Create a new PostgreSQL cluster with initdb, restore the dump there using psql, then use pg_dump to extract the single database you need.
It is know fact that backup and restore is a slow in Postgres
I'd like to deploy database to PostgreSQL server as fast as posible (Like it is possible in MS SQL just file copy and attach).
So If I:
backup and restore schema only.
And than copy database oid folder (data files) in to the appropriate oid ?
Will it work?
of not what I also need to be consider.
No, that won't work.
A database backup and restore can never be faster than copying the files is. So stop the database, copy the complete cluster and start PostgreSQL again. It won't get any faster.
I have a postgre database DATA1 in table space location D:\tbl_DATA1. We use OS backup restore tool copy the the D:\tbl_DATA1 to a target machine C:\tbl_DATA1. Is it possible for recreate the database from this folder in the second mahcine?
https://www.postgresql.org/docs/current/static/backup-file.html
An alternative backup strategy is to directly copy the files that
PostgreSQL uses to store the data in the database
and later two restrictions mentionned
The database server must be shut down in order to get a usable backup.
You should resotore the whole PGDATA direcotory, not the certain individual tables or databases from their respective files or directories.
So yes - it is a common practice to shutdown the PostgreSQL, copy PGDATA directory to other machine and start Postgres in order to get the cluser copy. But it is done cluster level - not tablespace as you mention or database - the whole data_directory should be copied.
So no - copying the tablespace directory and trying to hack the db to add a tablespace will fail.
I am fairly new with PQSQL and am slowly picking things up - I have added a new disk and would like to do two things:
Restore a backup to this new disk - /hda2/pgdata/
Move a database from /hda1/pgdata to /hda2/pgdata/
Q1. Use pg_restore to restore a database. Check out the documentation which is very clear.
One important thing to remember, if you want to move to a later version of PostgreSQL use the later version of pg_dump to create a backup dump file. For example if you want to move from PostgreSQL version 8.3 to version 8.4, then create a backup dump file using pg_dump from version 8.4 and then use pg_restore 8.4 to recreate database in the 8.4 server.
http://www.postgresql.org/docs/8.4/static/app-pgrestore.html
Q2. Backup and restore is a safe way of doing it. Before restoring one can create a tablespace on the new disk and place the database in that space.
CREATE DATABASE mydb TABLESPACE myspace;
http://www.postgresql.org/docs/8.4/interactive/manage-ag-tablespaces.html
Simple command to restore database
Open PSQL Command console
Provide credentials
go to specific database that you need to restore (If the dataabse is not there Create empty database
/i < sql Dump file Path > e.g. \i /usr/local/pgsql/db20121109.sql
I need to automate the creation of a duplicate db from the .bak of my production db. I've done the operation plenty of times via the GUI but when executing from the commandline I'm a little confused by the various switches, in particular, the filenames and being sure ownership is correctly replicated.
Just looking for the TSQL syntax for RESTORE that accomplishes that.
Assuming you're using SQL Server 2005 or 2008, the simplest way is to use the "Script" button at the top of the restore database dialog in SQL Server Management Studio. This will automatically create a T-SQL script with all the options/settings configured in the way you've filled in the dialog.
look here: How to: Restore a Database to a New Location and Name (Transact-SQL), which has a good example:
This example creates a new database
named MyAdvWorks. MyAdvWorks is a
copy of the existing AdventureWorks
database that includes two files:
AdventureWorks_Data and
AdventureWorks_Log. This database uses
the simple recovery model. The
AdventureWorks database already
exists on the server instance, so the
files in the backup must be restored
to a new location. The RESTORE
FILELISTONLY statement is used to
determine the number and names of the
files in the database being restored.
The database backup is the first
backup set on the backup device.
USE master
GO
-- First determine the number and names of the files in the backup.
-- AdventureWorks_Backup is the name of the backup device.
RESTORE FILELISTONLY
FROM AdventureWorks_Backup
-- Restore the files for MyAdvWorks.
RESTORE DATABASE MyAdvWorks
FROM AdventureWorks_Backup
WITH RECOVERY,
MOVE 'AdventureWorks_Data' TO 'D:\MyData\MyAdvWorks_Data.mdf',
MOVE 'AdventureWorks_Log' TO 'F:\MyLog\MyAdvWorks_Log.ldf'
GO
This may help also: Copying Databases with Backup and Restore