sys.indexes (Transact-SQL)

Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) SQL database in Microsoft Fabric

Contains a row per index or heap of a tabular object, such as a table, view, or table-valued function.

Column name	Data type	Description
object_id	int	ID of the object to which this index belongs.
name	sysname	Name of the index. name is unique only within the object. NULL = Heap
index_id	int	ID of the index. index_id is unique only within the object. 0 = Heap 1 = Clustered index > 1 = Nonclustered index
type	tinyint	Type of index: 0 = Heap 1 = Clustered rowstore (B-tree) 2 = Nonclustered rowstore (B-tree) 3 = XML 4 = Spatial 5 = Clustered columnstore index. Applies to: SQL Server 2014 (12.x) and later. 6 = Nonclustered columnstore index. Applies to: SQL Server 2012 (11.x) and later. 7 = Nonclustered hash index. Applies to: SQL Server 2014 (12.x) and later.
type_desc	nvarchar(60)	Description of index type: HEAP CLUSTERED NONCLUSTERED XML SPATIAL CLUSTERED COLUMNSTORE - Applies to: SQL Server 2014 (12.x) and later. NONCLUSTERED COLUMNSTORE - Applies to: SQL Server 2012 (11.x) and later. NONCLUSTERED HASH : NONCLUSTERED HASH indexes are supported only on memory-optimized tables. The sys.hash_indexes view shows the current hash indexes and the hash properties. For more information, see sys.hash_indexes (Transact-SQL). Applies to: SQL Server 2014 (12.x) and later.
is_unique	bit	1 = Index is unique. 0 = Index is not unique. Always 0 for clustered columnstore indexes.
data_space_id	int	ID of the data space for this index. Data space is either a filegroup or partition scheme. 0 = object_id is a table-valued function or in-memory index.
ignore_dup_key	bit	1 = IGNORE_DUP_KEY is ON. 0 = IGNORE_DUP_KEY is OFF.
is_primary_key	bit	1 = Index is part of a PRIMARY KEY constraint. Always 0 for clustered columnstore indexes.
is_unique_constraint	bit	1 = Index is part of a UNIQUE constraint. Always 0 for clustered columnstore indexes.
fill_factor	tinyint	> 0 = FILLFACTOR percentage used when the index was created or rebuilt. 0 = Default value Always 0 for clustered columnstore indexes.
is_padded	bit	1 = PADINDEX is ON. 0 = PADINDEX is OFF. Always 0 for clustered columnstore indexes.
is_disabled	bit	1 = Index is disabled. 0 = Index is not disabled.
is_hypothetical	bit	1 = Index is hypothetical and cannot be used directly as a data access path. Hypothetical indexes hold column-level statistics. 0 = Index is not hypothetical.
allow_row_locks	bit	1 = Index allows row locks. 0 = Index does not allow row locks. Always 0 for clustered columnstore indexes.
allow_page_locks	bit	1 = Index allows page locks. 0 = Index does not allow page locks. Always 0 for clustered columnstore indexes.
has_filter	bit	1 = Index has a filter and only contains rows that satisfy the filter definition. 0 = Index does not have a filter.
filter_definition	nvarchar(max)	Expression for the subset of rows included in the filtered index. NULL for heap, non-filtered index, or insufficient permissions on the table.
compression_delay	int	> 0 = Columnstore index compression delay specified in minutes. NULL = Columnstore index rowgroup compression delay is managed automatically.
suppress_dup_key_messages	bit	1 = Index is configured to suppress duplicate key messages during an index rebuild operation. 0 = Index is not configured to suppress duplicate key messages during an index rebuild operation. Applies to: SQL Server (Starting with SQL Server 2017 (14.x)), Azure SQL Database, and Azure SQL Managed Instance
auto_created	bit	1 = Index was created by the automatic tuning. 0 = Index was created by the user. Applies to: Azure SQL Database
optimize_for_sequential_key	bit	1 = Index has last-page insert optimization enabled. 0 = Default value. Index has last-page insert optimization disabled. Applies to: SQL Server (Starting with SQL Server 2019 (15.x)), Azure SQL Database, and Azure SQL Managed Instance

Permissions

The visibility of the metadata in catalog views is limited to securables that a user either owns, or on which the user was granted some permission. For more information, see Metadata Visibility Configuration.

Examples

The following example returns all indexes for the table Production.Product in the AdventureWorks2022 database.

SELECT i.name AS index_name  
    ,i.type_desc  
    ,is_unique  
    ,ds.type_desc AS filegroup_or_partition_scheme  
    ,ds.name AS filegroup_or_partition_scheme_name  
    ,ignore_dup_key  
    ,is_primary_key  
    ,is_unique_constraint  
    ,fill_factor  
    ,is_padded  
    ,is_disabled  
    ,allow_row_locks  
    ,allow_page_locks  
FROM sys.indexes AS i  
INNER JOIN sys.data_spaces AS ds ON i.data_space_id = ds.data_space_id  
WHERE is_hypothetical = 0 AND i.index_id <> 0   
AND i.object_id = OBJECT_ID('Production.Product');  
GO  

Next steps

Object Catalog Views (Transact-SQL)
Catalog Views (Transact-SQL)
sys.index_columns (Transact-SQL)
sys.xml_indexes (Transact-SQL)
sys.objects (Transact-SQL)
sys.key_constraints (Transact-SQL)
sys.filegroups (Transact-SQL)
sys.partition_schemes (Transact-SQL)
Querying the SQL Server System Catalog FAQ
In-Memory OLTP (In-Memory Optimization)