The following SQL statement creates a differential back up of the database "testDB":Example BACKUP DATABASE testDBTO DISK = 'D:\backups\testDB.bak'WITH DIFFERENTIAL; Tip: A differential back up reduces the back
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...
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 ...
By default, the automatic backup preference is set to Prefer Secondary. This specifies that backups should occur on a secondary replica - except if the primary replica is the only replica online. You can't take differential backups of your database by using this setting. To change this setti...
Differential Backup In SQL, you can also backup only the new changes compared to the last full backup by using theWITH DIFFERENTIALcommand. For example, -- backup the changes made to the databaseBACKUPDATABASEmy_dbTODISK ='C:\my_db_backup.bak'WITHDIFFERENTIAL; ...
如果将 DIFFERENTIAL 和COPY_ONLY 一起使用,则忽略 COPY_ONLY 并创建差异备份。 与 一起使用 BACKUP LOG时,此选项 COPY_ONLY 将创建 一个仅复制日志备份,该备份不会截断事务日志。 仅复制日志备份对日志链没有影响,其他日志备份的行为就像仅复制备份不存在一样。 有关详细信息,请参阅仅复制备份。 [ COMPRESSION...
--Take a differential backup for each writable filegoup (just backup FGPayment2018 as an example) BACKUP DATABASE [Payment] FILEGROUP = N'FGPayment2018' TO DISK = N'C:\DATA\Payment\BACKUP\Payment_FGPayment2018_20180316_diff.bak' WITH DIFFERENTIAL, COMPRESSION, Stats=5 ...
The job failed with the following error: The Backup Exec SQL Agent was not used to create the last full, differential, or log backup for this database. You must use the SQL Agent to run a full backup before you can run a differential backup or transaction log backup. ...
3. What are the main types of backups in SQL? The 3 main types of backups in Microsoft SQL Server are full backup, differential backup, and transaction log backup. Each backup type can meet the different needs of users.About the Author Updated by Oliver Oliver is an EaseUS profes...
B. Restoring a database, differential database, and transaction log backup This example restores a database, differential database, and transaction log backup of the MyAdvWorks database. 複製 -- Assume the database is lost at this point. Now restore the full -- database. Specify the orig...