Contents
How to restore DB backup with limited amount of disk?
Above assumes that the service account for the SQL Server service has permissions on the backup share/file. But, again, investigate what size each database file had when the backup was produced using RESTORE FILELISTONLY – that is the size the files will be created with. Welcome to DBA.SE. Currently your question results in a lot of IF s.
How much disk space do I need to restore SQL Server?
But when restored, it still has to expand the data file to its original size, even if most of it is empty. I had the same issue, I had a 800 MB database backup file which needed 320 GB free space to be restored in destination computer.
Why does my SQL Server have insufficient disk space?
Probably because the backup is compressed, or because there is a very large log file that doesn’t need to be part of the backup itself, or because the data file itself has been cleaned out – the backup is only comprised of pages that contain data.
How to calculate the size of a SQL Backup?
Replace the DISK parameter with the name and location of your backup file: Reference: RESTORE Statements – FILELISTONLY (Transact-SQL) (Microsoft | SQL Docs) The information provided in the Size column will give you the size required on disk.
Can a SQL Server Backup be compressed to save disk space?
Most SQL Server databases are highly compressible, so using compressed backups is a great way to save disk space and also speed up backup times. In addition to SQL Server native compression there are also several third party compressed backup tools which you should research as well.
How big does a SQL Server Backup need to be?
Also, the size of the target backup is close to 1/3 of the size shown by the reserved column in the output of sp_spaceused stored procedure. Most SQL Server databases are highly compressible, so using compressed backups is a great way to save disk space and also speed up backup times.
How does SQL Server allocate disk space?
As you can see below, from the multiple screen shots, SQL incrementally allocates disk space during the backup operation when using this trace flag and the files grows as needed. And finally, we can see our completed backup is the same size as our first backup.