Table size in the database - sql

Question

I am new to SQL i know how to get the size of the database using
EXEC sp_spaceused
I have a question how can i get the size of a table in Sql Server database.
like Employee Table in the database.
Thanks In advance.

Answer 1

This slightly involved T-SQL statement will give you the exact same information that sp_spaceused returns:
WITH pages AS
(
SELECT
object_id,
SUM(reserved_page_count) AS reserved_pages,
SUM(used_page_count) AS used_pages,
SUM(CASE
WHEN (index_id < 2)
THEN (in_row_data_page_count + lob_used_page_count + row_overflow_used_page_count)
ELSE lob_used_page_count + row_overflow_used_page_count
END) AS pages
FROM
sys.dm_db_partition_stats
GROUP BY
object_id),
extra AS
(
SELECT
p.object_id,
SUM(reserved_page_count) AS reserved_pages,
SUM(used_page_count) AS used_pages
FROM
sys.dm_db_partition_stats p
INNER JOIN
sys.internal_tables it ON p.object_id = it.object_id
WHERE
it.internal_type IN (202, 204, 211, 212, 213, 214, 215, 216)
GROUP BY
p.object_id)
SELECT
SchemaName = s.NAME,
TableName = t.NAME,
CompleteName = s.NAME + '.' + t.NAME,
(p.reserved_pages + ISNULL(e.reserved_pages, 0)) * 8 AS reserved_kb,
pages * 8 AS data_kb ,
(CASE
WHEN p.used_pages + ISNULL(e.used_pages, 0) > pages
THEN (p.used_pages + ISNULL(e.used_pages, 0) - pages)
ELSE 0
END) * 8 AS index_kb ,
(CASE
WHEN p.reserved_pages + ISNULL(e.reserved_pages, 0) > p.used_pages + ISNULL(e.used_pages, 0)
THEN (p.reserved_pages + ISNULL(e.reserved_pages, 0) - p.used_pages + ISNULL(e.used_pages, 0))
ELSE 0
END) * 8 AS unused_kb
FROM
pages p
INNER JOIN
sys.tables t ON t.object_id = p.object_id
INNER JOIN
sys.schemas s ON s.schema_id = t.schema_id
LEFT OUTER JOIN
extra e ON p.object_id = e.object_id
WHERE
t.is_ms_shipped = 0
ORDER BY
s.Name, t.Name
Of course, ideally, you'd "hide" this in a nicely useable stored procedure of your own to make it available whenever you need it ...

Answer 2

in mysql You can use this query to show the size of a table:
SELECT table_name AS "Table",
round(((data_length + index_length) / 1024 / 1024), 2) "Size in MB"
FROM information_schema.TABLES
WHERE table_schema = "$DB_NAME"
AND table_name = "$TABLE_NAME";
in sql:
sp_spaceused can get you information on the disk space used by a table, indexed view, or the whole database.
USE MyDatabase; GO
EXEC sp_spaceused N'dbo.MyTable'; GO
use this for all tables at once:
USE MyDatabase; GO
sp_msforeachtable 'EXEC sp_spaceused [?]' GO

Answer 3

One way is to look at the sys.dm_db_index_physical_stats output.
The min_record_size_in_bytes, max_record_size_in_bytes and avg_record_size_in_bytes will give you the sizes you want.
If you want to see the size of a particular record, another way is to find the physical row location, see
SQL Server 2008: New (undocumented) physical row locator function.
You can then dump the row physical structure, see Anatomy of a Record.