I wanted to know the script for full database backup to multiple files depending on the size of the backup file. meaning split the backup file to multiple small backup files. please assist.
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Is it possible to restore a detached database (no re-attachement)?
There is a big database, but no diskspace is available to create a backup.
So, I was thinking to detach the database, copy it to another server.
This other server uses powershell scripts to restore the database.
Will this work with a detached database? I cannot re-attach it with this script. Just restore.
Restore-SqlDatabase -ServerInstance $serverInstance -Database $myDb -BackupFile "detachedFile" -Credential $Cred
Backup of a database is different format (.bak). The files you get in the detach operation: mdf, ndf data file format , ldf log file format are different formats.
You can read about the formats. I have put the content below from the site for easier reference.
Usually, database backup files with .bak extension contain data in the
standard Microsoft Tape Format (MTF) used by Microsoft itself as
well as many backup tools for the Microsoft Windows platform.
Microsoft Tape Format is used while writing and reading data to and
from removable storage devices during storage management or data
protection operations such as data transfers, copies, backup and
restore. In the case of SQL Server, MTF files contain data and log
information (MDF and LDF files) necessary for restoring the database.
The MDF file is the Main Data File or primary database data file, that
binds all other files in that database together. The LDF is the Log
Data File and it contains all log information and is crucial for a
database restore process.
You cannot use Restore database command against mdf,ldf files. You need to use attach, detach approach for them to be available in another environment. As #Peter Smith suggested, you can use the powershell scripts to do the same.
In my work as a developer I often restore backups from a fileshare to my local sql server.
The latest backup is posted at irregular intervals on the fileshare. The new backup has the same name as the old one. I copy the backup file to my computer and restore it.
I would like to know if it is possible to quickly compare my local backup file to the one on the fileshare, do they have some embedded checksum or such?, so I know if it is worth to copy the file or not?
You could use an MD5 to do this. It's a checksum for any file.
Microsoft have a utility for making these, and you can run it from the command line. Here's an article including a link to download:
https://support.microsoft.com/en-us/kb/841290
I ended up using the creation date to compare sql backups. Since I use the comparison while doing development exact comparison of files are not necessary, and creating a MD5 just takes extra time.
The solution that I have use for my keeping my local sql development server up to date is using a script. I run this script once in a while to get a fresh database, or whenever I need a "clean" database backup.
The script will check for a new backup file. If a new file exist it will copy the new file to the local machine. After copy, the script will set the creation date of the copied file will to the date of the source backup file. After the check and copy step the script will run a RESTORE command. The restore is run even if no new file is copied. After the restore the script calls RoundhousE (https://github.com/chucknorris/roundhouse) to execute any change scripts that I have in my GIT folder that have not been applied to the database. (RoundhousE has added tables that keep track of scripts that have been run, to the database).
That way I keep my sql development server up to date.
I want to backup some specific data of SQL database by using vb.net code. In fact i want to save this file as .BAK file and then i want to restore it.
I couldn't find anything. all the solutions in the web was about full backup of database and there was not any method to backup some tables via code.
SQL Server does not permit backing up a single table. Full stop. No provision is made for this whatsoever.
It does permit restoring a single table from a complete backup, but this does not seem to be what you want.
I have a .sql file size about 4GB. I want to restore this database. However 'max_allowed_packet' option is only 1GB. So, how to restore this database? Someone help me please.
Thanks
Since this is a sql file (text file). Split this file to for example 10 parts and execute them.
I have a batch file I am running to shrink a large number of detached database log files. I first attach the database with a "default_database_name", then shrink the database, then detach it again and move onto the next database.
This accomplishes shrinking all my log files, however, then all my databases end up having the same logical database name. I am trying to avoid this.
Any ideas?
You can see this information, but you will have to use a hex editor to see it, for the databases I tested with I opened the MDF with a hex editor (HxD was the one I used) and the database name was visible at around offset 00000E20-00000E30: