Applies to: SQL Server
Returns properties of incremental statistics for the specified database object (table) in the current SQL Server database. The use of
sys.dm_db_incremental_stats_properties (which contains a partition number) is similar to
sys.dm_db_stats_properties which is used for non-incremental statistics.
This function was introduced in SQL Server 2014 (12.x) Service Pack 2 and SQL Server 2016 (13.x) Service Pack 1.
sys.dm_db_incremental_stats_properties (object_id, stats_id)
Is the ID of the object in the current database for which properties of one of its incremental statistics is requested. object_id is int.
Is the ID of statistics for the specified object_id. The statistics ID can be obtained from the sys.stats dynamic management view. stats_id is int.
|Column name||Data type||Description|
|object_id||int||ID of the object (table) for which to return the properties of the statistics object.|
|stats_id||int||ID of the statistics object. Is unique within the table. For more information, see sys.stats (Transact-SQL).|
|partition_number||int||Number of the partition containing the portion of the table.|
|last_updated||datetime2||Date and time the statistics object was last updated. For more information, see the Remarks section in this page.|
|rows||bigint||Total number of rows in the table when statistics were last updated. If the statistics are filtered or correspond to a filtered index, the number of rows might be less than the number of rows in the table.|
|rows_sampled||bigint||Total number of rows sampled for statistics calculations.|
|steps||int||Number of steps in the histogram. For more information, see DBCC SHOW_STATISTICS (Transact-SQL).|
|unfiltered_rows||bigint||Total number of rows in the table before applying the filter expression (for filtered statistics). If statistics are not filtered, unfiltered_rows is equal to the value returns in the rows column.|
|modification_counter||bigint||Total number of modifications for the leading statistics column (the column on which the histogram is built) since the last time statistics were updated.
This column does not contain information for memory-optimized tables.
sys.dm_db_incremental_stats_properties returns an empty rowset under any of the following conditions:
- The specified object is not found or does not correspond to a table with incremental statistics.
- The specified statistics ID does not correspond to existing statistics for the specified object ID.
- The current user does not have permissions to view the statistics object.
This behavior allows for the safe usage of
sys.dm_db_incremental_stats_properties when cross applied to rows in views such as
sys.stats. This method can return properties for the statistics that correspond to each partition. To see the properties for the merged statistics combined across all partitions, use the sys.dm_db_stats_properties instead.
Statistics update date is stored in the statistics blob object together with the histogram and density vector, not in the metadata. When no data is read to generate statistics data, the statistics blob is not created, the date is not available, and the last_updated column is NULL. This is the case for filtered statistics for which the predicate does not return any rows, or for new empty tables.
Requires that the user has select permissions on statistics columns or the user owns the table or the user is a member of the
sysadmin fixed server role, the
db_owner fixed database role, or the
db_ddladmin fixed database role.
A. Simple example
The following example returns the statistics for the
PartitionTable table described in the topic Create Partitioned Tables and Indexes.
SELECT * FROM sys.dm_db_incremental_stats_properties (object_id('PartitionTable'), 1);
For additional usage suggestions, see sys.dm_db_stats_properties.
DBCC SHOW_STATISTICS (Transact-SQL)
Object Related Dynamic Management Views and Functions (Transact-SQL)
Dynamic Management Views and Functions (Transact-SQL)