We have RESTORE VERIFYONLY to check the validity of SQL Servers backups.
It Verifies the backup but does not restore it, and checks to see that the backup set is complete and the entire backup is readable.
Is there any way to do the same in PostgreSQL?
How can we validate a logical backup in PostgreSQL without restoring it?
Related
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 understand that Cloud SQL ( Postgres) on-demand backup is incremental. when you restore an instance using this backup, the existing data is wiped off before the instance is restored with all new data. in other words, the "backup" process is incremental but there is no way to restore only a specific incremental backup into an instance
Please, can you confirm if the aforementioned understanding is right?
Indeed, Cloud SQL backups are incremental. Taken from the Documentation:
Backups for Second Generation instances are incremental; they contain
only data that has changed since the previous backup was taken. This
means that your oldest backup is a similar size to your database, but
the sizes of subsequent backups depend on the rate of change of your
data. When the oldest backup is deleted, the size of the next oldest
backup increases so that a full backup still exists.
Yet, Cloud SQL stores up to seven automated backups for each instance. This in fact allows you to restore to any specific backup, but of course, you will be delete all the data on the instance in order to restore the one in the backup.
If you are asking if it will be possible to restore only the incremental differences of an specific backup, then no, it is not possible. And it is also meant that way by the concept of Incremental Backups. You see, by definition, the incremental backup must have all the backups before. So, by restoring an "specific incremental backup into an instance" you are restoring the fullback + all the incremental backups up to the incremental backup you are requesting.
I have full, differential and transactional backups of the database. I was trying to restore one by one; but only the full backup is getting restored, but after that when I am trying to restore the differential backup facing issue with SQL Server Management Studio. So I tried with some SQL commands, this is the link what I tried with to restore, but no luck
Restore differential backup
Can anyone tell me the steps tor restore these backups? Thank you
It is important to be acquainted with the restore sequence of how a full database backup is restored.
First, restore full database backup, differential database backup and all transaction log backups WITH NORECOVERY option. After that, bring back database online using WITH RECOVERY option.
Following is a sample Restore Sequence
RESTORE DATABASE FROM full_database_backup WITH NORECOVERY;
GO
RESTORE DATABASE FROM differential_backup WITH NORECOVERY;
GO
RESTORE LOG FROM log_backup WITH NORECOVERY;
GO
-- Repeat this until you restore last log backup
RESTORE DATABASE WITH RECOVERY;
GO
Note:
While performing a RESTORE operation using more than one file, always use the NORECOVERY flag. This will keep the database offline to prevent any changes which could create some integrity issues. Once all the backup files have been restored, run the RESTORE command with the RECOVERY option to get the database online and operational.
Source: URL
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 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