| title | description | author | ms.author | ms.date | ms.service | ms.subservice | ms.topic | helpviewer_keywords | dev_langs | monikerRange | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
System dynamic management views (Transact-SQL) |
Dynamic management views and functions return server state information that can be used to monitor the health of a server instance, diagnose problems, and tune performance. |
rwestMSFT |
randolphwest |
10/02/2023 |
sql |
system-objects |
reference |
|
|
>=aps-pdw-2016 || =azuresqldb-current || =azure-sqldw-latest || >=sql-server-2016 || >=sql-server-linux-2017 || =azuresqldb-mi-current || =fabric |
[!INCLUDE sql-asdb-asdbmi-asa-pdw-fabricse-fabricdw]
Dynamic management views (DMVs) and dynamic management functions (DMFs) return server state information that can be used to monitor the health of a server instance, diagnose problems, and tune performance.
Important
Dynamic management views and functions return internal, implementation-specific state data. Their schemas and the data they return may change in future releases of [!INCLUDE ssNoVersion]. Therefore, dynamic management views and functions in future releases may not be compatible with the dynamic management views and functions in this release. For example, in future releases of [!INCLUDE ssNoVersion], Microsoft may augment the definition of any dynamic management view by adding columns to the end of the column list. We recommend against using the syntax SELECT * FROM dynamic_management_view_name in production code because the number of columns returned might change and break your application.
There are two types of dynamic management views and functions:
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Server-scoped dynamic management views and functions. These require VIEW SERVER STATE permission on the server. For SQL Server 2022 and later, VIEW SERVER PERFORMANCE STATE is required, or VIEW SERVER SECURITY STATE is required for a few DMVs that are security related.
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Database-scoped dynamic management views and functions. These require VIEW DATABASE STATE permission on the database. For SQL Server 2022 and later, VIEW DATABASE PERFORMANCE STATE is required, or VIEW DATABASE SECURITY STATE is required for a few DMVs that are security related.
Dynamic management views can be referenced in [!INCLUDE tsql] statements by using two-part, three-part, or four-part names. Dynamic management functions on the other hand can be referenced in [!INCLUDE tsql] statements by using either two-part or three-part names. Dynamic management views and functions can't be referenced in [!INCLUDE tsql] statements by using one-part names.
All dynamic management views and functions exist in the sys schema and follow this naming convention dm_*. When you use a dynamic management view or function, you must prefix the name of the view or function by using the sys schema. For example, to query the dm_os_wait_stats dynamic management view, run the following query:
SELECT wait_type, wait_time_ms
FROM sys.dm_os_wait_stats;To query a dynamic management view or function requires SELECT permission on object and VIEW SERVER STATE or VIEW DATABASE STATE permission. This lets you selectively restrict access of a user or login to dynamic management views and functions. To do this, first create the user in master and then deny the user SELECT permission on the dynamic management views or functions that you don't want them to access. After this, the user can't select from these dynamic management views or functions, regardless of database context of the user.
Note
Because DENY takes precedence, if a user has been granted VIEW SERVER STATE permissions but denied VIEW DATABASE STATE permission, the user can see server-level information, but not database-level information.
Dynamic management views and functions have been organized into the following categories.
:::row::: :::column::: Always On Availability Groups Dynamic Management Views - Functions
[Change Data Capture - sys.dm_cdc_errors](change-data-capture-sys-dm-cdc-errors.md)
[Change Tracking - sys.dm_tran_commit_table](change-tracking-sys-dm-tran-commit-table.md)
[Common Language Runtime Related Dynamic Management Views (Transact-SQL)](common-language-runtime-related-dynamic-management-views-transact-sql.md)
[Database Mirroring - sys.dm_db_mirroring_auto_page_repair](database-mirroring-sys-dm-db-mirroring-auto-page-repair.md)
[Database related dynamic management views (Transact-SQL)](database-related-dynamic-management-views-transact-sql.md)
[Execution Related Dynamic Management Views and Functions (Transact-SQL)](execution-related-dynamic-management-views-and-functions-transact-sql.md)
[Extended Events Dynamic Management Views](extended-events-dynamic-management-views.md)
[FILESTREAM and FileTable dynamic management views (Transact-SQL)](filestream-and-filetable-dynamic-management-views-transact-sql.md)
[Full-Text and Semantic Search Dynamic Management Views - Functions](full-text-and-semantic-search-dynamic-management-views-functions.md)
[Geo-Replication Dynamic Management Views and Functions (Azure SQL Database)](geo-replication-dynamic-management-views-and-functions-azure-sql-database.md)
[Index Related Dynamic Management Views and Functions (Transact-SQL)](index-related-dynamic-management-views-and-functions-transact-sql.md)
[I/O Related Dynamic Management Views and Functions (Transact-SQL)](i-o-related-dynamic-management-views-and-functions-transact-sql.md)
[Monitor and troubleshoot PolyBase](../polybase/polybase-troubleshooting.md)
:::column-end:::
:::column:::
[Memory-Optimized Table Dynamic Management Views (Transact-SQL)](memory-optimized-table-dynamic-management-views-transact-sql.md)
[Object Related Dynamic Management Views and Functions (Transact-SQL)](object-related-dynamic-management-views-and-functions-transact-sql.md)
[Query Notifications - sys.dm_qn_subscriptions](query-notifications-sys-dm-qn-subscriptions.md)
[Replication Related Dynamic Management Views (Transact-SQL)](replication-related-dynamic-management-views-transact-sql.md)
[Resource Governor Related Dynamic Management Views (Transact-SQL)](resource-governor-related-dynamic-management-views-transact-sql.md)
[Security-Related Dynamic Management Views and Functions (Transact-SQL)](security-related-dynamic-management-views-and-functions-transact-sql.md)
[Server dynamic management views and functions (Transact-SQL)](server-related-dynamic-management-views-and-functions-transact-sql.md)
[Service Broker Related Dynamic Management Views (Transact-SQL)](service-broker-related-dynamic-management-views-transact-sql.md)
[Spatial Data - sys.dm_db_objects_disabled_on_compatibility_level_change](spatial-data-sys-dm-db-objects-disabled-on-compatibility-level-change.md)
[SQL and Parallel Data Warehouse Dynamic Management Views](sql-and-parallel-data-warehouse-dynamic-management-views.md)
[SQL Server Operating System Related Dynamic Management Views (Transact-SQL)](sql-server-operating-system-related-dynamic-management-views-transact-sql.md)
[Stretch Database related dynamic management views (Transact-SQL)](/previous-versions/sql/relational-databases/system-dynamic-management-views/stretch-database-related-dynamic-management-views-transact-sql)
[Transaction Related Dynamic Management Views and Functions (Transact-SQL)](transaction-related-dynamic-management-views-and-functions-transact-sql.md)
:::column-end:::
:::row-end:::