![]() You can shrink a log file only while the database is online, and at least one virtual log file (VLF) is free. For more information, see the Recommendations. If the storage space is required again after a log shrink, the transaction log will grow again and by doing that, introduce performance overhead during log growth operations. It is not recommended to shrink data files if regular application workload will cause the files to grow to the same allocated size again.īe aware of the potential negative performance impact of shrinking database files, see Index maintenance after shrink.īefore shrinking the transaction log, keep in mind Factors that can delay log truncation. Shrink commands impact database performance while running, and if possible should be run during periods of low usage. Data and log files that grow due to regular, recurring business operations do not require shrink operations. Shrink operations should not be considered a regular maintenance operation. This DMV returns information about the amount of log space currently used, and indicates when the transaction log needs truncation.įor information about the current log file size, its maximum size, and the autogrow option for the file, you can also use the size, max_size, and growth columns for that log file in sys.database_files. Monitor log space use by using sys.dm_db_log_space_usage. Connect to a user databaseĬAST(FILEPROPERTY(name, 'SpaceUsed') AS decimal(19,4)) * 8 / 1024. Use the following query to return the amount of database file space allocated and the amount of unused space allocated. Query a single database for file space information The following diagram illustrates the relationship between the different types of storage space for a database. The amount of data space allocated cannot grow beyond the data max size. The maximum amount of space that can be used for storing database data. This quantity represents the maximum amount of free space that can be reclaimed by shrinking database data files. The difference between the amount of data space allocated and data space used. ![]() ![]() This behavior ensures that future inserts are faster since space does not need to be reformatted. The amount of space allocated grows automatically, but never decreases after deletes. The amount of formatted file space made available for storing database data. For example, deleting one row from every data page does not necessarily decrease the space used. In some cases, the space used does not change on inserts or deletes depending on the amount and pattern of data involved in the operation and any fragmentation. Generally, space used increases (decreases) on inserts (deletes). The amount of space used to store database data. Understanding the following storage space quantities are important for managing the file space of a database. Understand types of storage space for a database For information about Azure SQL Database, see Manage file space for databases in Azure SQL Database. Though very similar, for information on managing the size of transaction log files in Azure SQL Managed Instance, see Manage file space for databases in Azure SQL Managed Instance. This article covers how to monitor SQL Server transaction log size, shrink the transaction log, add to or enlarge a transaction log file, optimize the tempdb transaction log growth rate, and control the growth of a transaction log file.
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