Let’s check the row counts of tables using script that are using sys.partitions system catalog view and compare the output of a table with the output of SELECT COUNT (*) .

Get Row Counts of All Tables using sys.partitions or DMV sys.dm_db_partition_stats

System catalog view sys.partitions contains a row for each partition of all the tables and most types of indexes in the database. All tables and indexes in SQL Server contain at least one partition, whether they are explicitly partitioned. Run below script to get the row count of all tables in a database. If you want to find row counts using DMV sys.dm_db_partition_stats, i would suggest you to visit our attached article how to find row counts of all tables in a database.

--Run below script to get the row counts of all tables in a database.
SELECT      SCHEMA_NAME(O.schema_id) + '.' +
        O.Name As [Schema.TableName], SUM(P.rows) AS 'Total_RowCount'
FROM        sys.objects O
INNER JOIN sys.partitions P ON O.object_id = P.object_id
WHERE     O.type = 'U'
GROUP BY    O.schema_id, O.Name

You can see row count of all tables in below screenshot.

Now we will check row count of a table using SELECT COUNT(*) command. I ran below command and you can see that row count is not same here. Row count came using sys.partitions system catalog view has more value than the row count of SELECT COUNT (*).

As i said above “sys.partitions or DMV sys.dm_db_partition_stats contains a row for each partition of all the tables and most types of indexes in the database” so when you are fetching row counts of tables using sys.partitions system catalog view or DMV sys.dm_db_partition_stats, it will display the row counts after adding indexes row counts and table row counts. That is why value is showing more in sys.partitions or in sys.dm_db_partition_stats output.

Suppose you have a table with 5000 rows in it and you’ve defined 5 indexes on it, the above query would show 5*5000=25000 rows for that table. So, it isn’t just that some rows are inconsistence, it is that some rows are multiplied by the number of indexes they have.

If we need correct row count using the system cataog view sys.partitions then we need to put a condition in WHERE clause for index_id column. We can also get total row count of all the heap tables or for all the clustered index tables as well by changing the value of index_id mentioned in WHERE clause. Index_id value indicates the ID of the index within the object to which this table belongs.

• 0 = heap
• 1 = clustered index
• 2 or greater = nonclustered index

We can pass index_id value in above script to get the total row count of all tables whether it is heap or clustered index table. If you need total row count of all the tables present in a database, you should put index_id<2 condition in WHERE clause. Run below scripts to get the row count of all heap & clustered index tables.

--Run below script to get the row counts of all tables in a database.
--Change the value of index_id to 0 or 1 to get total row count to heap or cluster index tables.
SELECT      SCHEMA_NAME(O.schema_id) + '.' +
        O.Name As [Schema.TableName], SUM(P.rows) AS 'Total_RowCount'
FROM        sys.objects O
INNER JOIN sys.partitions P ON O.object_id = P.object_id
WHERE     O.type = 'U'
		AND P.index_id<2  
GROUP BY    O.schema_id, O.Name

Now you can run above script and compare the output with the SELECT COUNT(*) output. We can see row count for given table is showing same after adding idex_id condition in below screenshot.

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The post Why is table row count showing incorrect value in sys.partitions or in DMV sys.dm_db_partition_stats appeared first on Techyaz.com.

• Tables
• Heap tables only
• Clustered index tables only
• Tables having specific Schema

We can get total row counts of all tables using system catalog view sys.partitions or DMV sys.dm_db_partition_stats. Read attached article if you are getting wrong row counts using this DMV or catalog view. Let’s check the row counts using both ways in this tip.

Get Row Counts of Tables using sys.partitions

System catalog view sys.partitions 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 SQL Server contain at least one partition, whether or not they are explicitly partitioned. Run below script to get the row count of all tables in a database.

--Run below script to get the row counts of all tables in a database.
SELECT      SCHEMA_NAME(O.schema_id) + '.' +SELECT      SCHEMA_NAME(O.schema_id) + '.' + O.name As [Schema.TableName],  SUM(P.rows) AS [Total_RowCount] 
FROM        sys.objects O
INNER JOIN sys.partitions P ON O.object_id = P.object_id
WHERE     O.type = 'U' AND P.index_id<2  
GROUP BY    O.schema_id, O.name
ORDER BY [Total_RowCount] desc

You can see row count of all tables in below screenshot.

We can get total row count of all the heap tables or for all the clustered index tables as well by changing the value of index_id mentioned in WHERE clause. Index_id value indicates the ID of the index within the object/table. If index_id value is 0 that means that table doesn’t have any cluster index and a Heap table.

• 0 = heap
• 1 = clustered index
• 2 or greater = nonclustered index

We can pass index_id value in above script to get the total row count of all tables whether it is heap or clustered index table. Run below scripts to get the row count of all heap tables.

--Run below script to get the row counts of all Heap (tables without cluster index) in a database.
--Change the value of index_id from 0 to 1 to get total row count to cluster index tables.
SELECT      SCHEMA_NAME(O.schema_id) + '.' +
        O.name As [Schema.TableName], SUM(P.rows) AS [Total_RowCount]
FROM        sys.objects O
INNER JOIN sys.partitions P ON O.object_id = P.object_id
WHERE     O.type = 'U'
		AND P.index_id=0  --Change this value according to your need
GROUP BY    O.schema_id, O.name
ORDER BY [Total_RowCount] desc

You can see there are only two tables that have no cluster index in above screenshot. We can also get the row count of all tables having a specific schema by adding a condition in WHERE clause.

--Run below script to get the row count of all tables having dbo Schema in a database.
SELECT      SCHEMA_NAME(O.schema_id) + '.' +
        O.name As [Schema.TableName], SUM(P.rows) AS [Total_RowCount]
FROM        sys.objects O
INNER JOIN sys.partitions P ON O.object_id = P.object_id
WHERE     O.type = 'U'
		AND P.index_id<2  
		AND SCHEMA_NAME(O.schema_id) ='dbo'--Change dbo with your schema name for which you need row counts
GROUP BY    O.schema_id, O.name
ORDER BY [Total_RowCount] desc

You can see the output in below image. You can make changes as per your need.

Get Row Count of All Tables using DMV sys.dm_db_partition_stats

DMV sys.dm_db_partition_stats returns page and row-count information for every partition in the current database. We will leverage this DMV to get row count details of all tables. Run below script to get the row count of all tables using this DMV.

--Run below script to get the row count of all tables in a database.
SELECT QUOTENAME(SCHEMA_NAME(O.schema_id)) + '.' + QUOTENAME(O.name) AS [Schema.TableName]
      , SUM(p_dmv.row_count) AS [Total_RowCount]
FROM sys.objects AS O
      INNER JOIN sys.dm_db_partition_stats AS p_dmv
            ON O.object_id = p_dmv.object_id
WHERE  O.type = 'U'
        AND p_dmv.index_id < 2
GROUP BY
      O.schema_id
      , O.name
ORDER BY [Schema.TableName]
GO 

We can see the output of above script in below image.

We can pass index_id value in above script to get the total row count of all tables whether it is heap or clustered index table. Run below scripts to get the row count of all heap & clustered index tables.

--Run below script to get the row counts of all Heap (tables without cluster index) in a database.
--Change the value of index_id from 0 to 1 to get total row count to cluster index tables.
--Change the schema name if you want the row count of tables that are having specific schema.
SELECT QUOTENAME(SCHEMA_NAME(O.schema_id)) + '.' + QUOTENAME(O.name) AS [Schema.TableName]
      , SUM(p_dmv.row_count) AS [Total_RowCount]
FROM sys.objects AS O
      INNER JOIN sys.dm_db_partition_stats AS p_dmv
            ON O.object_id = p_dmv.object_id
WHERE  O.type = 'U'
        AND p_dmv.index_id < 2
	AND SCHEMA_NAME(O.schema_id) = 'dbo'--Change the name of your Schema to get row count of all tables having this schema.
GROUP BY
      O.schema_id
      , O.name
ORDER BY [Schema.TableName]
GO 

And here is the output:

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