December 2017
Intermediate to advanced
434 pages
10h 14m
English
Content preview from SQL Server 2017 Administrator's Guide
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Data files
Every database must have at least one data file called primary data file. This file is always bound to the primary filegroup. In this file is all the metadata of the database, such as structure descriptions (could be seen through views such as sys.objects, sys.columns, and others), users, and so on. If the database does not have other data files (in the same or other filegroups), all user data is also stored in this file, but this approach is good enough just for smaller databases.
Considering how the volume of data in the database grows over time, it is a good practice to add more data files. These files are called secondary data files. Secondary data files are optional and contain user data only.
Both types of data files have ...
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