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sys-partitions-transact-sql.md

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title sys.partitions (Transact-SQL)
description sys.partitions (Transact-SQL)
author rwestMSFT
ms.author randolphwest
ms.date 09/01/2021
ms.prod sql
ms.prod_service database-engine, sql-database, synapse-analytics, pdw
ms.technology system-objects
ms.topic reference
f1_keywords
partitions
partitions_TSQL
sys.partitions_TSQL
sys.partitions
helpviewer_keywords
sys.partitions catalog view
dev_langs
TSQL
ms.assetid 1c19e1b1-c925-4dad-a652-581692f4ab5e
monikerRange >=aps-pdw-2016||=azuresqldb-current||=azure-sqldw-latest||>=sql-server-2016||>=sql-server-linux-2017||=azuresqldb-mi-current

sys.partitions (Transact-SQL)

[!INCLUDE sql-asdb-asdbmi-asa-pdw]

Contains a row for each partition of all the tables and most types of indexes in the database. Special index types such as Full-Text, Spatial, and XML are not included in this view. All tables and indexes in [!INCLUDEssNoVersion] contain at least one partition, whether or not they are explicitly partitioned.

Column name Data type Description
partition_id bigint Indicates the partition ID. Is unique within a database.
object_id int Indicates the ID of the object to which this partition belongs. Every table or view is composed of at least one partition.
index_id int Indicates the ID of the index within the object to which this partition belongs.

0 = heap
1 = clustered index
2 or greater = nonclustered index
partition_number int Is a 1-based partition number within the owning index or heap. For non-partitioned tables and indexes, the value of this column is 1.
hobt_id bigint Indicates the ID of the data heap or B-tree (HoBT) that contains the rows for this partition.
rows bigint Indicates the approximate number of rows in this partition.
filestream_filegroup_id smallint Applies to: [!INCLUDEssSQL11] and later.

Indicates the ID of the FILESTREAM filegroup stored on this partition.
data_compression tinyint Indicates the state of compression for each partition:

0 = NONE
1 = ROW
2 = PAGE
3 = COLUMNSTORE : Applies to: [!INCLUDEssSQL11] and later
4 = COLUMNSTORE_ARCHIVE : Applies to: [!INCLUDEssSQL14] and later

Note: Full text indexes will be compressed in any edition of [!INCLUDEssNoVersion].
data_compression_desc nvarchar(60) Indicates the state of compression for each partition. Possible values for rowstore tables are NONE, ROW, and PAGE. Possible values for columnstore tables are COLUMNSTORE and COLUMNSTORE_ARCHIVE.

Permissions

Requires membership in the public role. For more information, see Metadata Visibility Configuration.

Examples

Determine space used by object and show related partition information

The following query returns all the object in a database, the amount of space used in each object, and partition information related to each object.

SELECT object_name(object_id) AS ObjectName,
total_pages / 128. AS SpaceUsed_MB,
p.partition_id,
p.object_id,
p.index_id,
p.partition_number,
p.rows,
p.data_compression_desc
FROM sys.partitions AS p
JOIN sys.allocation_units AS au ON p.partition_id = au.container_id
ORDER BY SpaceUsed_MB DESC;

See Also

Object Catalog Views (Transact-SQL)
Catalog Views (Transact-SQL)
Querying the SQL Server System Catalog FAQ