I have a question about how to backup a specific Database using pgbackrest:
the problem is when I tried to restore a selected db using --include-db option of pgbackrest i got just the selected db and built-in databases(postgres, template0 and template1) restored, and when i tried to connect another db after the restore I got this error :
**FATAL: relation mapping file "base/24581/pg_filenode.map" contains invalid data
Previous connection kept**
is there any solution that allows the restore of the whole db with the selected one without losing the other databases ??
Thank you
I don't think this is possible according to the documentation of Include Database option:
Include Database Option (--db-include) Restore only specified
databases. This feature allows only selected databases to be restored.
Databases not specifically included will be restored as sparse, zeroed
files to save space but still allow PostgreSQL to perform recovery.
After recovery the databases that were not included will not be
accessible but can be removed with the drop database command. NOTE:
built-in databases (template0, template1, and postgres) are always
restored.
Related
I have 2 separate PostgreSQL databases in Google Cloud SQL for PostgreSQL. The databases should be separate due to security concerns, but they can reside in the same database instance. When restoring from a backup, it is important for me to have the databases restored to the same point in time, due to data relations.
I tried to understand how the backup works. I tried to research the backup documentation and restore one, but found no clue.
Can I be sure that restoring an instance would bring all its databases to the same point in time?
If you restore a Cloud SQL instance backup, it will restore all the databases in that instance to the point when backup was taken. One thing to note here is that if you restore the backup in the same instance it will overwrite the current data with the one in backup.
You can see the General tips about performing a restore to further help you understand the restoration.
I would like to back up, and then restore, the contents of an entire postgres installtion, including all roles, all databases, everything.
During the restore, the target postgres installation shall be entirely replaced, so that its state is entirely as specified in the backup, no matter what's on the target postgres installation currently.
Existing answers include this and this, but none of them meets my requirements because
They use pg_dump, forcing me to list the databases manually. I don't want that. I want all databases.
They suggest pg_dumpall + psql, which doesn't work if the target installation already has (some part of) the tables; typical errors include ERROR: role "myuser" cannot be dropped because some objects depend on it, as a result the table is not dropped, and as a result the eventual COPY command importing data fails with e.g. ERROR: duplicate key value violates unique constraint.
They suggest copying on-disk data files, which doesn't work when you want to backup e.g. from version 9.5 and restore into version 9.6.
How can you backup, and restore, everything in a postgres installation, with one command each?
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.
i want to drop a database in oracle 10g..
i saw the command
DROP database.
How to run this query and drop database.
If i tried this query, it is showing error as invalid query.
Oracle documentation states:
Dropping a database involves removing
its datafiles, redo log files, control
files, and initialization parameter
files. The DROP DATABASE statement
deletes all control files and all
other database files listed in the
control file. To use the DROP DATABASE
statement successfully, all of the
following conditions must apply:
The database must be mounted and closed.
The database must be mounted exclusively--not in shared mode.
The database must be mounted as RESTRICTED.
An example of this statement is:
DROP DATABASE;
The DROP DATABASE statement has no
effect on archived log files, nor does
it have any effect on copies or
backups of the database. It is best to
use RMAN to delete such files. If the
database is on raw disks, the actual
raw disk special files are not
deleted.
If you used the Database Configuration
Assistant to create your database, you
can use that tool to delete (drop)
your database and remove the files.
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