MODIFY FILE (NAME = AdventureWorks2012_Data, FILENAME = WHERE database_id = DB_ID('AdventureWorks2012') Listing 1 shows an example of how to move a database's data file to a different location. To change the location of existing data and log files, you can run the ALTER DATABASE command with the MODIFY FILE option. When creating databases, you can specify the locations of your data and log files using the T-SQL CREATE DATABASE command. Data files are used to support queries and often need to support numerous read operations. Because SQL Server writes all the database transactions into the transaction log, the log files benefit from being on drives with high write performance. For example, for a SQL Server 2014 instance installed on the C drive, the data and log files are in the C:\Program Files\Microsoft SQL Server\MSSQL12.MSSQLSERVER\MSSQL\DATA directory by default.Īs a best practice, you should place the data and log files on different drives. Unless you specify otherwise, the data and log files are created in the same directory as the SQL Server system databases, which is :\Program Files\Microsoft SQL Server\MSSQL. If you use SQL Server Management Studio (SSMS) to create a new database, the data and log files are stored on the same drive by default. A database can have multiple log files that reside on one or more drives. SQL Server transaction log files are NTFS files that have a file extension of. These files store the database transactions that allow a database to be restored back to a specific point in time. A basic database consists of a single data file, but a database can consist of multiple data files that reside on one or more drives. SQL Server data files are NTFS files that have a file extension of. The most basic concept to understand concerning how SQL Server uses storage is that databases are composed of two types of files: You can avoid this bottleneck if you have a basic understanding how SQL Server uses storage and know some essential SQL Server storage best practices. With today's increases in server and virtual server processing power and large-scale memory support, storage and I/O can easily become the bottleneck for overall system throughput. There's no doubt that storage is one of the key components to SQL Server performance and availability for both large and small SQL Server instances.
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