NEC Storage ReplicationControl SQL Option User Manual page 21

File group
On Microsoft SQL Server 2000, this refers to a labeled aggregate of one or more files. A unit of
assignment or a unit of database management is called a file group.
The default file group is PRIMARY.
Although it is not necessary that file extensions, such as .mdf, .ndf, and .ldf, be used with the Microsoft
SQL Server 2000, those file extensions are useful for identifying file usage.
By backing up the transaction log from the log file when a data error occurs, it is possible to recover
data up to the point of error.
This makes it necessary to allocate the data file and the log file in different logical volumes.
To improve error resistibility, the data file and the log file are allocated to the logical volumes assigned
to different RANK.
For operational purposes, the NEC Storage ReplicationControl SQL Option targets all the files and file
groups included in the database. When specifying MV/RV with the parameters of snapshot
backup/restore commands, specify the MV/RV of all the files included in the database.
The data replication function operates in logical disk units. Therefore, when different database files
exist in a logical disk, all of the databases in the logical disk must be operated at the same time.
Furthermore, the Microsoft SQL Server 2000 controls the connections of users for each instance.
Therefore, it is not possible to refer to database information included in a different instance or
information on the files and file groups contained in the database. The NEC Storage
ReplicationControl SQL Option checks that the specified databases properly correspond to the
operation target logical disks. However, when database files included in different instances exist in
logical disks, it does not check the relationship between the databases and the logical disks. Therefore,
when operating with multiple instances, be sure to specify all necessary databases and logical disks.
The NEC Storage ReplicationControl SQL Option does not specify a static point on other files than
those of database. Place only database files in the backup-target MV.
Chapter 3 Database System Configuration
15