sys.dm_db_log_space_usage (Transact-SQL)

Artikel
06/10/2022
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Applies to: SQL Server (all supported versions) Azure SQL Database Azure SQL Managed Instance

Returns space usage information for the transaction log.

Note

All transaction log files are combined.

Column name	Data type	Description
database_id	smallint	Database ID.
total_log_size_in_bytes	bigint	The size of the log
used_log_space_in_bytes	bigint	The occupied size of the log
used_log_space_in_percent	real	The occupied size of the log as a percent of the total log size
log_space_in_bytes_since_last_backup	bigint	The amount of space used since the last log backup Applies to: SQL Server 2014 (12.x) through SQL Server, SQL Database.

Permissions

On SQL Server and SQL Managed Instance, requires VIEW SERVER STATE permission.

On SQL Database Basic, S0, and S1 service objectives, and for databases in elastic pools, the server admin account, the Azure Active Directory admin account, or membership in the ##MS_ServerStateReader## server role is required. On all other SQL Database service objectives, either the VIEW DATABASE STATE permission on the database, or membership in the ##MS_ServerStateReader## server role is required.

Examples

A. Determine the Amount of Free Log Space in tempdb

The following query returns the total free log space in megabytes (MB) available in tempdb.

USE tempdb;  
GO  

SELECT (total_log_size_in_bytes - used_log_space_in_bytes)*1.0/1024/1024 AS [free log space in MB]  
FROM sys.dm_db_log_space_usage;

sys.dm_db_log_space_usage (Transact-SQL)

Permissions

Examples

A. Determine the Amount of Free Log Space in tempdb

See Also