The crucial difference between SQL differential backup and a full backup is that differential backup includes all data that have been changed since the last full backup despite the fact that they have been included in the previous differential backup. It means that SQL differential backup is not...
This example creates a full and a differential database backup for the MyAdvWorks database.复制 -- Create a full database backup first. BACKUP DATABASE MyAdvWorks TO MyAdvWorks_1 WITH INIT GO -- Time elapses. -- Create a differential database backup, appending the backup -- to the ...
执行BACKUP DATABASE 语句可以创建差异数据库备份,同时指定: 要备份的数据库的名称。 写入完整数据库备份的备份设备。 DIFFERENTIAL 子句,用于指定仅备份自上次创建完整数据库备份之后已更改的数据库部分。 要求语法为: BACKUP DATABASE database_name TO <backup_device> WITH DIFFERENTIAL ...
如果在数据库只读时采用差异基准,则差异位图指示的更改会比基准备份之后实际发生的更改更多。 额外的数据由备份读取,但不会写入到备份中,因为存储在backupset系统表中的differential_base_lsn用于确定是否在基准备份之后更改了数据。 重新构建、还原只读数据库或者分离再重新附加只读数据库后,会丢失差异基准信息。 这是由于...
If you have a huge SQL Server database, differential backups can be a very good solution to save disk space and backup time. In this article I will compare it to the other 2 of 3 main backup types, and introduce you 3 quick ways to create a SQL Server differential backup. ...
Both full backups and differential backups also contain some transaction log records so that the restored component (database, file, or filegroup) can be made transactionally consistent. Consider an example transaction that inserts a record into a table with a single nonclustered index. The pages...
BACKUP DATABASE { database_name | @database_name_var } <file_or_filegroup> [ ,...n ] TO <backup_device> [ ,...n ] [ <MIRROR TO clause> ] [ next-mirror-to ] [ WITH { DIFFERENTIAL | <general_WITH_options> [ ,...n ] } ] ...
differential backup it will contain every extent changed since the last full backup. When you go to restore your database, to get to the most current time you only need to restore the full backup and the most recent differential backup. All of the other differential backups can be ignored....
How to Restore Differential Backup in SQL Server? To restore a differential backup, you can use SSMS or T-SQL code. Select theDeviceoption and press the Browse button. Press theAddbutton and select the .bak file. Note:In the above example, we stored the backup at theC:\data\DIFF.bakpa...
As the differential backups increase in size, restoring a differential backup can significantly increase the time that is required to restore a database. Therefore, we recommend that you take a new full backup at set intervals to establish a new differential base for the data. For example, ...