Sp_spaceused - Too Much Unused Space
Jul 20, 2005
On a production database, there is a 2GB database, when I run
sp_spaceused it indicates a very high quanity of unused space. The
database has been shrunk & free space sent to the OS. Why is this
value so high, what can I do to reclaim the space?
database_name database_size unallocated space
------------------------------------------------------------------------------
DB_00001 2004.13 MB 49.64 MB
reserved data index_size unused
------------------ ------------------ ------------------
--------------
1531248 KB 412720 KB 165168 KB 953360 KB
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Jul 20, 2005
I have a large table that I recently purged a year of data from.However, the table size in sp_spaceused hasn't decreased as much as Iwould expect. (there are no text or large object columns on thistable, BTW) Running sp_spaceused on the table shows the following.rows reserved data index size unusedTABLE_NAME23470880 67790808 KB 18116312 KB 3211616 KB 46462880 KBI ran a dbcc indexdefrag on all indexes on the table last night,including the clustered index, and I'm still seeing pretty much thesame amount of space reported as unused.The one thing that I haven't done yet is to run the sp_spaceused onthis table with the @updateusage flag set to true as I need to do thisafterhours to reduce contention. I will attempt this tonight andreport on the results.Here's DBCC SHOWCONTIG OUTPUT for the table:DBCC SHOWCONTIG scanning 'TABLE_NAME' table...Table: 'TABLE_NAME' (917578307); index ID: 1, database ID: 7TABLE level scan performed.- Pages Scanned................................: 2264447- Extents Scanned..............................: 285484- Extent Switches..............................: 287092- Avg. Pages per Extent........................: 7.9- Scan Density [Best Count:Actual Count].......: 98.59%[283056:287093]- Logical Scan Fragmentation ..................: 0.04%- Extent Scan Fragmentation ...................: 3.19%- Avg. Bytes Free per Page.....................: 2418.9- Avg. Page Density (full).....................: 70.12%DBCC execution completed. If DBCC printed error messages, contact yoursystem administrator.Looking through the history of the group, the one thing that seems toremedy this problem consistantly is to bcp out all the data, trunc thetable and bcp all the data back in. This is not really a possibilityfor me due to the size of the table and the availability expectationsof my customers. Is there anything that I forgot to check? Do youthink that it's just a matter of incorrect statistics in sp_spaceused?Thanks in advance:Matt
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May 20, 2000
Could some one help me to explain what does it means when I ran sp_spaceused on the database it reported ex. -15430kb for unused. Does this mean that the index ran out off space. Do I need to increase space for the database. I will try to run the dbcc check hope it will fix the problem.
Thanks.
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Mar 1, 2006
How can I determine how much unused space to remove from database files? I am setting up a maintenance plan and I am trying figure that out.
Also, is there a rule on how far to shrink TL?
Please help. Thanks.
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Mar 1, 2005
Hi All,
When i run sp_spaceused on one of my database, PROD, it gives the following output
database_name: PROD
database_size: 4268.00 MB
unallocated space: -789.82 MB
reserved: 4654920 KB
data: 2929008 KB
index_size: 327272 KB
unused: 1398640 KB
Why is that the unallocated space is negative ?
On the drive where the datafiles resides there is enough free space . Also, the datafile and transaction are set to auto grow with unlimited file growth
FYI - the OS is Windows 2000 and the DB is SQL Server 2000 with SP3
Appreciate your time and help on this.
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Mar 29, 2001
Hello,
I have a table which resides on a diff.filegroup.
The space allocated is 7700MB.
Now ehen I use sp_spaceused 'table_name' to see how much space is left it's giving me data as
rows reserved data index Unused
at 1000hrs 629879 6777904 5068344 8 1709552
After an hour 637537 6780336 5070800 8 1709528
After 2hours 643883 6782560 5072904 0 1709656
After 2.5hrs 646887 6783584 5073920 0 KB 1709664 kb
after 3hrs 647239 6783712 5074056 0 KB 1709656 K
If you note rows are increasing,so is the reserved place and data but unused is also increasing.I think it should come down.
What behavior is this?How can I find out how much space is left in this table residing on diff.file group?
TIA
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Mar 12, 2004
I wrote simple script to check space used by tables:
CREATE TABLE #SpaceUsed(
TableName NVARCHAR(128),
NoOfRows INT,
Reserved NVARCHAR(18),
Data NVARCHAR(18),
Index_Size NVARCHAR(18),
Unused NVARCHAR(18)
)
GO
sp_msforeachtable "INSERT INTO #SpaceUsed EXEC sp_spaceused '?'"
SELECT * FROM #SpaceUsed
SELECT
CAST(Sum(CAST(Replace(Reserved,' KB','') AS INT)) AS NVARCHAR) + ' KB' AS TotalReserved,
CAST(Sum(CAST(Replace(Data,' KB','') AS INT)) AS NVARCHAR) + ' KB' AS TotalData,
CAST(Sum(CAST(Replace(Index_Size,' KB','') AS INT)) AS NVARCHAR) + ' KB' AS TotalIndex_Size,
CAST(Sum(CAST(Replace(Unused,' KB','') AS INT)) AS NVARCHAR) + ' KB' AS TotalUnused
FROM #SpaceUsed
DROP TABLE #SpaceUsed
and one of results looks strange to me:
TableName NoOfRows Reserved Data Index_Size Unused
-------------------------------------------------------------------------------------------------------------------------------- ----------- ------------------ ------------------ ------------------ ------------------
T_TableXX 50081 38024 KB 37432 KB 640 KB -48 KB
Anyone know reason of such result (negative value of unused space)?
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Oct 17, 2005
I was just reading a doc on SQL , that said that to free up the unused space from the DB , you should use the shrinkdatabase DBCC commnad. ....
I want to knw how to determine how much free unused space is there in a DB
Thanks,
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Feb 7, 2002
I am working with a large database that has its tables stored on a secondary filegroup. I'm trying to shrink the size of the files but I can't seem to get the system to free up the unused space. I've tried shrinkdatabase and shrinkfile both with and without the truncateonly option. Has anyone else had this problem? Is there a workaround? Any help would be greatly appreciated.
Thank you.
Cathy
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Mar 13, 2008
I'm trying to figure out how to reclaim unused space in a huge table (tbl) after setting one of the text columns to be the empty string. Other tables have foreign key columns associated with tbl.
After doing something like this,
update tbl set col = ''
the table doesn't automatically reclaim that space. If I do a direct insert into a new table like this,
insert into tbl2 (cola, colb, colc) select * from tbl
the new table is smaller as expected (about half the size in my case). Any ideas?
Rob
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Sep 22, 2005
Hey guys,
I have a table which has 6 text columns (tblA).. I no longer require 1 of those text columns and want to reclaim the space that it is currently taking up..
Is the only way to BCP out all the data (except the 1 column i no longer require) drop the column and BCP the data back into the table?
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Sep 15, 2014
currently stuck with an issue where I need to reclaim the unused table space in SQL server.
ISSUE: Due to database size issue we have moved all the images from database to filesystem and want to reclaim the unused space now....I have tried shrinking the database and rebuild the indexes but didn't see any difference in the table or database size.
Similarly I have identified many Non clustered indexes on big transactional tables(~ 4 million records) that where not used since GO live 1 year back, so I wanted to drop these indexes to cut down the performance and maintenance overhead , so my question is will dropping these indexes reduces the database size?
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Dec 30, 2014
best method to my issue regarding unused space. SQL SERVER 2014 BI EDITTION..I have a table that showed 62% Data, 7% unallocated, and 29% unused space.I ran the ALTER TABLE <table name> REBUILD, which changed it to 32% data and 67% unused.What I do with this table monthly and what I believe is causing this unused space issue is this:Every 1st of the month I get a csv file that holds around 3.2 million rows/15 columns of data. About 3 gbs every time.It's 13 months of data. I remove the last 12 months from the current table and import the new 13 month data.I do this twice a month and have no choice because the data is constantly updated and why we get it twice a month.So I am deleting around 6 gbs of data a month as well as adding around 6 gbs of data a month.
I believe this is why I end up with so much unused space, but just found the REBUILD command, which worked but now a small hit on performance and have too much space in the current table. I have read several times that shrinking the file is no good, but what other way to get rid of the extra space in this table? Also, the table doesn't have any indexes or primary key because of duplicates.
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May 26, 2015
OS: Windows Server 2008 R2 Standard
SQL Server: 2008 SP1 Standard
We have a database with about 500 GB of free disk space on data file and the database is being set to read only mode for the fore-see-able future. We would like to release this unused disk space. We know that we could shrink the data file and then work on re-indexing to remove fragmentation.we wanted to check if some other method like backup and restore of the database could free up unused disk space in the data file. if someone was able to release unused disk space on data file by implementing a backup and restore.
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Feb 23, 2012
how to claim unused free space at table level. The database size is of 4.6TB, recently I deleted some data which is of almost 1.5TB but my unused space has grown upto 2.5TB leaving me short of space on my drives. How do I claim this usused on to OS Disk space?
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May 28, 2004
When I run sp_spaceused I will get something like:
database_name . database_size . unallocated space
------------------ ----------------- ------------------
. . . DBA . . . . . . . 2.50 MB . . . . . 0.07 MB
reserved . . . . . . data . . . . . . . index_size . . . . unused
------------------ ------------------ ------------------ ------------------
1720 KB . . . . . . . 888 KB . . . . . . 648 KB . . . . . .184 KB
Is there any way to load this info into a Table?
I'm having trouble because there are (2) result sets returned.
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Oct 18, 2000
I am using the sp_spaceused system stored procedure to identify tables in my database that are large. I have two questions. Can anyone help me sort this list. I assume this is returned in clustered order, but I want to order the list by rows. Also, when I run this sp_spaceused stored proc, on some of my tables I get a negative value returned under the 'index_size' and 'unused' columns in my result set. How can this be.
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Jan 12, 2000
I am looking for an accurate way to calculate database size and
unused space.
I do NOT want the log size calculated into the database size or
the space unused.
Thank you
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Sep 16, 2002
on some of our sql 6.5 databases the space available is shown as 0MB. I realise that I must run sp_spaceused to get an accurate result, but the results I then get are slightly confusing. All I want to know is the space left in both the database and the log - can I get a reading for both?. Sometimes the unused space is shown as a negative number. Can anyone advise since books online is fairly unspecific.
(the total script that i run incidentaly is:
exec sp_spaceused
go
DBCC checktable (sysindexes)
go
DBCC checktable (syslogs)
go
exec sp_spaceused @updateusage=true
go)
Thanks
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Jul 27, 1999
Can someone please explain the outputs below of the sp_spaceused stored procedure.
database_name database_size unallocated space
------------------------------ ------------------ ------------------
Employees 5054.00 MB 1441.93 MB
reserved data index_size unused
------------------ ------------------ ------------------ ------------------
3698758 KB 2770552 KB 917274 KB 10932 KB
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Jun 29, 2001
hi,
I used sp_spaceused 'owner.tablename' and it shows index size as 24kb whereas there is no index on this table.
I thought may be it's not showing the right statistics so I update the statistics but it is still showing the same .
what is happening?
I am using SQl 2k/Win2k.
TIA.
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Sep 7, 2004
can someone please explain what reserved, data and unused represent?
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Jul 20, 2005
Hi,In our environment sp-spaceused returns:Allocated: 500Unallocated: -100Enterprise Database Taskpad shows that our total database size = 400 MB(320 used; 80 unused)Windows Explorer shows also that MDF file is more or less 400 MB.What does sp_spaceused exactly ???How do I SELECT the 320;80 of the taskpad with a query ???Greetings,Arno de Jong, The Netherlands.
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Nov 2, 1999
What does sp_spaceused show nonzero sizes for data, reserved and index size when the table is empty?
It also does this on 6.5.
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Mar 15, 1999
I have ran sp_spaceused (SQL 6.5 SP4) on my database (4000MB Data, 500 Log) and received the following output for "Reserved" : 4412390 KB. Note that this is more than 4000MB. I checked and made sure my data and log were truly separated...
Just to make sure, I added 2000MB more data space. Sp_spaceused now returned the following for reserved: 3493220 KB.
I am wondering why the allocation dropped, while no user activity was taking place during the process of growing the database....sp_spaceused reported data size first at 2725532, then at 1806314. Any ideas? A bug? Did the database fill up and begin using log pages...?
Any help is GREATLY appreciated...
Thanks!
Dean
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Oct 26, 2006
Hi,
I ran sp_spaceused against a DB table, and got -160K in the field "unused". If anybody can explain what this negative number means?
We have a problem with performance. It's extremly slow. The table contains 600,000 records. Even simple select * from <table> (table scan) takes 6 minutes. This is SQL Server2000.
Any help is appreciated.
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Aug 16, 2005
I can't remember if I posted this already or not:
CREATE PROCEDURE sp_space @sortbyrows bit=0 AS
SET NOCOUNT ON
select cast(object_name(id) as varchar(50)) AS name, sum(CASE WHEN indid<2 THEN rows END) AS rows,
sum(reserved)*8 AS reserved, sum(dpages)*8 AS data, sum(used-dpages)*8 AS index_size, sum(reserved-used)*8 AS unused
from sysindexes with (nolock) where indid in(0,1,255) and id>100
GROUP BY id with rollup
ORDER BY CASE WHEN @sortbyrows=1 THEN sum(CASE WHEN indid<2 THEN rows END) ELSE sum(reserved)*8 END desc
Usage:
EXEC sp_space --show stats sorted by reserved space size
EXEC sp_space 1 --show stats sorted by row count
It basically displays the results of sp_spaceused, but broken out by each table, and it rolls it up to a grand total. Naturally, for the most accurate results you should run DBCC UPDATEUSAGE before running this sproc.
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Oct 3, 2007
I am looking for a way to programatically determine the size of the data contained in a table, much like the sp_spaceused proc in SQL Server.
Thanks.
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May 10, 2007
name
rows
reserved
data
index_size
unused
Table1
2553136
294424 KB
293176 KB
1072 KB
176 KB
When I run sp_spaceused on a table called Table1, I get numbers as shown above.
I have a clustered Index on a datetime column AND that is the only index on the table.
So according to my calculations Index Size should be 2553136 (No. Of Rows) X (8 (DataType of DateTime) + 4 (Uniquifier) )
So the number I should be seeing in the Index Size column = 2553136 * 12 = 30637 KB, why am I only seeing 1072 KB ?
Where am I going wrong in my calculations.
To be more specific -- how do I calculate the Size Occupied by Indexes on a Particular Table ??
Thanks
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Feb 25, 2008
What does the following SQL code mean?
EXEC sp_msforeachtable 'sp_spaceused ''?'''
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Jun 10, 2004
I executed sp_spaceused on the db ang got following results
database_name:myDB
database_size: 1017.75 MB
unallocated space :104.13 MB
reserved : 309752 KB
data : 306832 KB
index_size : 1936 KB
unused : 984 KB
If we add reserved,data,index_size and unused up , we will get around 600MB.But the database has size of 1G. Could anyone tell me why?
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Jun 19, 2000
Hello,
I started to write a stored procedure to insert into a temp table from sp_spaceused but couldn't get the format right. I did a search in the swynk archive and saw that some people have solved this but I couldn't see any example code. Does anyone have scripts they've written to gather db size info using sp_spaceused or some other mechanism?
Thanks in advance,
Dan
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Mar 1, 1999
Hello:
I have gotten the following information from sp_spaceused:
----------------------------------------------------------------------
database_name database_size unallocated space
------------------------------ ------------------ ------------------
EP_tran2 700.00 MB 273.21 MB
reserved data index_size unused
------------------ ------------------ ------------------ ------------------
437034 KB 295106 KB 1447796 KB -1305868 KB
--------------------------------------------------------------------
I unfortunately since this is for a test database that I have put the data and log on the same device.
My questions are:
1) Why do I have negative numbers?
2) Should I be concerned about this?
3) for a live database can I drop the log and put the log on another device? What do I need to do?
4) has anybody seen this before?
5)what can I use to get accurate numbers?
THanks. Any information will be greatly appreciated.
DAvid Spaisman
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