Modification is sent by application to SQL Server Modification
is sent by application to SQL Server 1 Data pages are located in,
or read into the buffer cache and then modified Data pages are
located in, or read into the buffer cache and then modified 2
Buffer Cache Modification is recorded in transaction log on disk 3
Later, checkpoint writes dirty pages to database Later, checkpoint
writes dirty pages to database 4
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Recovery ModelDescription SimpleDoes NOT permit transaction log
(t-log) backups. Automatically truncates log to reduce space
requirements FullRequires LOG BACKUPS to manage t-log space
requirements. Avoids data loss if damaged or missing database file
occurs. Permits point-in-time recovery. Bulk LoggedRequires log
backups to manage t-log space requirements. Improves performance
during bulk copy operations. Reduces t-log space usage by using
minimal logging of operations.
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Web Application 200GB Site Collections Project Sites Department
Sites HR Sites Marketing Sites 750mb X 250 = 187,500mb / 1024 =
183gb 250
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mdfldf Sunday Full Backup mdfldf Tuesday Differential mdfldf
Differential Monday mdfldf Differential Wednesday You Lose mdf file
of database on Thursday at 4:00pm (1) BACKUP LOG DB_Name TO
D:\SQLBackups\TempBackup.Bak WITH NORECOVERY (4) RESTORE LOG FROM
D:\SQLBackups\TempBackup.Bak BACKUP LOG DB_Name TO
D:\SQLBackups\Weekly_T_Log.Bak WITH INIT
