DBCC PDW_SHOWSPACEUSED (Transact-SQL)

Applies to: yesAzure Synapse Analytics yesAnalytics Platform System (PDW)

Displays the number of rows, disk space reserved, and disk space used for a specific table, or for all tables in a Azure Synapse Analytics or Analytics Platform System (PDW) database.

Topic link icon Transact-SQL Syntax Conventions (Transact-SQL)

Syntax

-- Show the space used for all user tables and system tables in the current database  
DBCC PDW_SHOWSPACEUSED [ WITH IGNORE_REPLICATED_TABLE_CACHE ] 
[;]  
  
-- Show the space used for a table  
DBCC PDW_SHOWSPACEUSED ( " [ database_name . [ schema_name ] . ] | [ schema_name .] table_name  " ) [ WITH IGNORE_REPLICATED_TABLE_CACHE ] 
[;]  

Note

This syntax is not supported by serverless SQL pool in Azure Synapse Analytics.

Arguments

[ database_name . [ schema_name ] . | schema_name . ] table_name
The one, two, or three-part name of the table to be displayed. For two or three-part table names, the name must be enclosed with double quotes (""). Using quotes around a one-part table name is optional. When no table name is specified, the information is displayed for the current database.

WITH IGNORE_REPLICATED_TABLE_CACHE An optional parameter to view the size of the table without the replicated table cache size included. The size of the replicated table cache is variable depending on the service level objective. For further details see: What is a replicated table?

Permissions

Requires VIEW SERVER STATE permission.

Result Sets

This is the result set for all tables. Before a cache is created for a replicated Synapse table, the DBCC result reflects the total size of the underlying round robin table from each distribution. After the cache is created, the result reflects the total size of the round robin tables and the cache.

Column Data Type Description
reserved_space bigint Total space used for the database, in KB.
data_space bigint Space used for data, in KB.
index_space bigint Space used for indexes, in KB.
unused_space bigint Space that is part of the reserved space and not used, in KB.
pdw_node_id int Compute node that is being used for the data.

This is the result set for one table.

Column Data Type Description Range
rows bigint Number of rows.
reserved_space bigint Total space reserved for the object, in KB.
data_space bigint Space used for the data, in KB.
index_space bigint Space used for indexes, in KB.
unused_space bigint Space that is part of the reserved space and not used, in KB.
pdw_node_id int Compute node that is used for reporting the space usage.
distribution_id int Distribution that is used for reporting the space usage. For Parallel Data Warehouse, its value is -1 for replicated tables.

Examples: Azure Synapse Analytics and Analytics Platform System (PDW)

A. DBCC PDW_SHOWSPACEUSED Basic Syntax

The following examples show multiple ways to display the number of rows, disk space reserved, and disk space used by the FactInternetSales table in the AdventureWorksPDW2012 database.

-- Uses AdventureWorks  
  
DBCC PDW_SHOWSPACEUSED ( "AdventureWorksPDW2012.dbo.FactInternetSales" );  
DBCC PDW_SHOWSPACEUSED ( "AdventureWorksPDW2012..FactInternetSales" );  
DBCC PDW_SHOWSPACEUSED ( "dbo.FactInternetSales" );  
DBCC PDW_SHOWSPACEUSED ( FactInternetSales );  

B. Show the disk space used by all tables in the current database

The following example shows the disk space reserved and used by all user tables and system tables in the AdventureWorksPDW2012 database.

-- Uses AdventureWorks  
  
DBCC PDW_SHOWSPACEUSED;  

See also