DB Engine :: Reclaiming Table Space After Deleting Records
Aug 5, 2015
I have many large tables with millions of records in a SQL Server database. They all use an Identity column which is the clustered index. We haven't been deleting any records until recently because disk space is now becoming a problem.
Assuming I delete a lot of old records, I'm thinking that the freed up space in the data pages won't be reused. New records will be added at the end of the table because of the Identity column being the clustered index. So the table will keep getting bigger even though there is lots of free space.
Assuming I'm right, then how do I recapture this unused space? Is an alter table rebuild the best way? Or rebuilding the clustered index?
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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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Jun 12, 2015
I have a requirement to delete 1 Million records from a table having 10 Million data and it's being queried on 24/7 basis (don't have a downtime). how can I achieve that?
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Oct 13, 2004
Hi,
In my data archiving process , I would end up deleting hunders records from the production databases but would that help me save some DISK space immediately??? Should I run some DBCC command to get some disk space ?
if SO ..!! What should I do after deleting the records..????
Thanks
Cheriyan.
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Feb 20, 2008
Hi,
I was running out of space and thus deleted some rows from a table. To my surprise the db size increased. I then shrunk it to bring it back to what it was earlier.
When i deleted some 5000 rows, some space must have been released. Where did the space go and why did the db size increase after deleting the records?
I thght it might be log files..but db is set to Simple Recovery which does not utilize a Log File.
Any reasons?
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Nov 27, 2012
I'm running a security application that generates a lot of events. I have gone in over the past couple days and deleted large numbers of old events in an effort to reclaim space on the D: drive where the SQL DB for this app resides. I did this throught the app itself... through its GUI front end.
I'm not having any impact. There is not a file on the same drive where the deleted events are being directed to. If all these events are going away, why does my used space on the drive not shrink? I came at it from another tack, creating sql queries to delete old events from the same app. I did this through queries in the SQL mgmt studio. The tasks (multiple) completed successfully, and the report on the # of rows 'affected' showed that it was a substantial number. No decrease in the windows drive space being used. Any tips?
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Jan 23, 2008
Dear Friends,I'm running a SQL 2005 database. Lately (in the last 4 months) my database size has grown exponentially and now totals 2.5 gig (it used to be about 100mb). When I run sp_spaceused i get the following info:
Reserved Space 2522MB
Data 450MB
Indexes 215MB
Unused 1856MB
<!--[if !supportLineBreakNewLine]-->
The unused space is reserved by my two largest tables, one being 542mb (which is a log I create and the size seems fine for the amount of data) reserving 1033mb and the other being 121mb (which is another log and also seems fine) reserving most of the rest.
I have tried running DBCC SHRINKFILE and DBCC CLEANTABLE commands on a backup copy of the database and cannot seem to free the unused space.
I have also tried copying the database in an attempt to reduce the unused reserved space and have tried creating a new database and importing the tables with no luck
Any help would be greatly appreciated, noting that I'm honestly not that technical and would probably need step by step instructions, but if you only have time to point me in the right direction that would also be of great help!
Jano
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Jul 11, 2014
Having just archived quite a bit of data from the main Production DB, I now have around 15% free, reclaimable space sat in the data file.
I'm reluctant to run DBCC SHRINKFILE as that apparently causes a lot of Index fragmentation which will cause issues for performance - how else can the space be allocated back to the OS?
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Mar 18, 2014
I have a situation where deleting old records is blocking updating latest records on highly transactional table and getting timeout errors from application.
In details, I have one table called Tran_table1 in OLTP database. This Tran_table1 is highly transactional table, it will receive data for insert/update continuously
While archiving 2 years old records from Tran_table1 into Tran_table1_archive in batches(using DELETE OUTPUT INTO clause), if there is any UPDATEs on Tran_table1,these updates are getting blocked and result is timeout errors in application.
Is there any SQL Server hints to avoid blocking ..
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Feb 11, 2015
I have a table 300+GB. it holds 10 years of Data. I need to delete 5 years of data and put it to another server so I can have more space.
If I delete 5 years of data, Transaction log gets so huge and size of the database even gets bigger because of the .ldf file which even gets bigger! I think I can shrink the log file and the data file. Is this the best way to do it?
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Dec 2, 2007
Hi, i need the suggestion here in very familiar db situation ..i have a main table and a primary key of that table is used in many other table as foreign key.If i am deleting a record in a main table,how do i make sure that all the corresponding record in the associated tables,where that foreign key is used, gets deleted too?What are my options?Thanks
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Jul 6, 2006
I loaded one table via SSIS and found that it contained many duplicate records (from the input source). I can create a SQL task to delete them, but I wonder if SSIS offers and task "out of the box" to delete dups?
TAI,
barkingdog
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Aug 24, 2015
I'm trying to delete some records from some tables in a SQL Server 2008 R2 database. There's a foreign key relationship between the two tables. To make things easier here's the definition of both tables:
-- Parent table
CREATE TABLE [dbo].[PharmInvInItemPackages](
[InventoryInDetailID] [int] IDENTITY(1,1) NOT NULL,
[InventoryInID] [int] NOT NULL,
[ItemPackageID] [int] NOT NULL,
[code]....
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Sep 24, 2015
I have one table having three columns.This table contains lot of repeated records. I want to delete this records .
In this below example i want to delete all the records which columns id and no columns contains same values.
id no sequence
------------------------------------
35 35432 1
35 35432 2
35 35432 3
36 35432 1
35 45623 1
First three records the columns id and no contains same value. I want to delete this three records.
But in last record for id =35 and no column =45623.it is not repeated so it should not be deleted.
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Jan 27, 2006
Is there a way to delete records from table passing parameter as tablename? I won't to delete all records from a table dependent on table selected. i'm trying to do this with stored procedure...Table to delete depends on the checkbox selected.
Current code(works)
Public Function DelAll()
MZKDB = MZKHRFin
If sloption = "L" Then
sqlConn.ConnectionString = "Server=" & MZKSrv & ";Initial Catalog=" & MZKDB & ";Integrated Security=SSPI;"
ElseIf sloption = "S" Then
sqlConn.ConnectionString = "Server=" & MZKSrv & ";User id=sa;Password=" & MZKPswd & "; Initial Catalog=" & MZKDB & ";"
End If
sqlConn.Open()
sqlTrans = sqlConn.BeginTransaction()
sqlCmd.Connection = sqlConn
sqlCmd.Transaction = sqlTrans
Try
sqlCmd.CommandText = sqlStr
sqlCmd.ExecuteNonQuery()
sqlTrans.Commit()
frm2.txtResult.Text = frm2.txtResult.Text & " " & TableName & " Prior records have been deleted from the database." & vbCrLf
SetCursor()
Catch e As Exception
Try
sqlTrans.Rollback()
Catch ex As SqlException
If Not sqlTrans.Connection Is Nothing Then
frm2.txtResult.Text = frm2.txtResult.Text & " " & TableName & " An exception of type " & ex.GetType().ToString() & " was encountered while attempting to roll back the transaction." & vbCrLf
SetCursor()
End If
End Try
frm2.txtResult.Text = frm2.txtResult.Text & " " & TableName & " Records were NOT deleted from the database." & vbCrLf
SetCursor()
Finally
sqlConn.Close()
End Try
ResetID()
End Function
If cbGenFY.Checked Then
sqlStr = "DELETE FROM FIN_FiscalYear"
TableName = "dbo.FIN_FiscalYear"
DelAll()
ClearCounts()
timeStepStart = Date.Now
GenFY()
timeStepStop = Date.Now
DispOneCounts()
End If
If cbGenFund.Checked Then
sqlStr = "DELETE FROM FIN_Fund"
TableName = "dbo.FIN_Fund"
DelAll()
ClearCounts()
timeStepStart = Date.Now
GenFund()
timeStepStop = Date.Now
DispOneCounts()
End If
If cbGenFunc.Checked Then
sqlStr = "DELETE FROM FIN_Function"
TableName = "dbo.FIN_Function"
DelAll()
ClearCounts()
timeStepStart = Date.Now
GenFunc()
timeStepStop = Date.Now
DispOneCounts()
End If
If cbGenObject.Checked Then
sqlStr = "DELETE FROM FIN_Object"
TableName = "dbo.FIN_Object"
DelAll()
ClearCounts()
timeStepStart = Date.Now
GenObject()
timeStepStop = Date.Now
DispOneCounts()
End If
If cbGenCenter.Checked Then
sqlStr = "DELETE FROM FIN_Center"
TableName = "dbo.FIN_Center"
DelAll()
ClearCounts()
timeStepStart = Date.Now
GenCenter()
timeStepStop = Date.Now
DispOneCounts()
End If
If cbGenProject.Checked Then
sqlStr = "DELETE FROM FIN_CodeBook"
TableName = "dbo.FIN_CodeBook"
DelAll()
sqlStr = "DELETE FROM FIN_BudgetAccnt"
TableName = "dbo.FIN_BudgetAccnt"
DelAll()
sqlStr = "DELETE FROM FIN_Budget"
TableName = "dbo.FIN_Budget"
DelAll()
sqlStr = "DELETE FROM FIN_Project"
TableName = "dbo.FIN_Project"
DelAll()
ClearCounts()
timeStepStart = Date.Now
GenProject()
timeStepStop = Date.Now
TableName = "dbo.FIN_Project"
DispOneCounts()
End If
If cbGenProgram.Checked Then
sqlStr = "DELETE FROM FIN_Program"
TableName = "dbo.FIN_Program"
DelAll()
ClearCounts()
timeStepStart = Date.Now
GenProgram()
timeStepStop = Date.Now
DispOneCounts()
End If
If cbGenGL.Checked Then
sqlStr = "DELETE FROM FIN_gl"
TableName = "FIN_gl"
DelAll()
ClearCounts()
timeStepStart = Date.Now
GenGL()
timeStepStop = Date.Now
DispOneCounts()
End If
If cbGenRevenue.Checked Then
sqlStr = "DELETE FROM FIN_Revenue"
TableName = "FIN_Revenue"
DelAll()
ClearCounts()
timeStepStart = Date.Now
GenRevenue()
timeStepStop = Date.Now
DispOneCounts()
End If
If cbGenBank.Checked Then
sqlStr = "DELETE FROM FIN_VendorBankAccnt"
TableName = "dbo.FIN_VendorBankAccnt"
DelAll()
sqlStr = "DELETE FROM FIN_VendorBank"
TableName = "dbo.FIN_VendorBank"
DelAll()
sqlStr = "DELETE FROM FIN_bankAdd"
TableName = "dbo.FIN_bankAdd"
DelAll()
sqlStr = "DELETE FROM FIN_bankTERMS"
TableName = "dbo.FIN_bankTerms"
DelAll()
sqlStr = "DELETE FROM FIN_bank"
TableName = "dbo.FIN_bank"
DelAll()
ClearCounts()
timeStepStart = Date.Now
GenBank()
timeStepStop = Date.Now
TableName2 = "dbo.FIN_bankTERMS"
TableName3 = "dbo.FIN_BankAdd"
TableName4 = "dbo.FIN_VendorBank"
TableName5 = "dbo.FIN_VendorBankAccnt"
DispTwoCounts()
End If
If cbFinAP.Checked Then
sqlStr = "DELETE FROM FIN_Period"
TableName = "FIN_Period"
DelAll()
ClearCounts()
timeStepStart = Date.Now
GenPeriod()
timeStepStop = Date.Now
DispOneCounts()
End If
If cbFinVM.Checked Then
sqlStr = "DELETE FROM FIN_vendorClass"
TableName = "FIN_vendorClass"
DelAll()
sqlStr = "DELETE FROM FIN_vendorAdd"
TableName = "FIN_vendorAdd"
DelAll()
sqlStr = "DELETE FROM FIN_vendor"
TableName = "FIN_vendor"
DelAll()
sqlStr = "DELETE FROM FIN_AddressType"
TableName = "FIN_AddressType"
DelAll()
sqlStr = "DELETE FROM FIN_VendorStatus"
TableName = "FIN_VendorStatus"
DelAll()
sqlStr = "DELETE FROM States"
TableName = "States"
DelAll()
sqlStr = "DELETE FROM Country"
TableName = "Country"
sqlStr = "DELETE FROM FIN_IndustrialCodes"
TableName = "FIN_IndustrialCodes"
DelAll()
ClearCounts()
timeStepStart = Date.Now
GenIndCodes()
timeStepStop = Date.Now
DispOneCounts()
DelAll()
ClearCounts()
timeStepStart = Date.Now
FinVendStat()
timeStepStop = Date.Now
TableName = "FIN_VendorStatus"
DispOneCounts()
ClearCounts()
timeStepStart = Date.Now
FinAddrType()
timeStepStop = Date.Now
TableName = "FIN_AddressType"
DispOneCounts()
ClearCounts()
timeStepStart = Date.Now
GenCountry()
timeStepStop = Date.Now
TableName = "Country"
DispOneCounts()
ClearCounts()
timeStepStart = Date.Now
GenState()
timeStepStop = Date.Now
TableName = "States"
DispOneCounts()
ClearCounts()
timeStepStart = Date.Now
FinVM()
timeStepStop = Date.Now
TableName = "FIN_Vendor"
TableName2 = "FIN_VendorAdd"
DispTwoCounts()
End If
If cbFinbudget.Checked Then
sqlStr = "DELETE FROM FIN_BudgetAccnt"
TableName = "FIN_BudgetAccnt"
DelAll()
sqlStr = "DELETE FROM FIN_Budget"
TableName = "FIN_Budget"
DelAll()
sqlStr = "DELETE FROM FIN_CodeBook"
TableName = "FIN_CodeBook"
DelAll()
ClearCounts()
TableName = "FIN_Budget"
timeStepStart = Date.Now
FinBudget()
timeStepStop = Date.Now
DispOneCounts()
ClearCounts()
TableName = "FIN_Codebook"
TableName2 = "FIN_budgetAccnt"
timeStepStart = Date.Now
FinCodeBook()
timeStepStop = Date.Now
DispTwoCounts()
ClearCounts()
End If
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Sep 11, 2007
Hi,
I have a query that is executing properly but i want to delete the results of the query. I am trying to do it but i am messing up somewhere in the syntax
Can anybody help me out with this problem?
Below is the query
DELETE FROM DPT_NEW_BINS WHERE(
Select BIN,LEFT(ACCT_NUM_MIN,16), LEFT(ACCT_NUM_MAX,16), ISO_CTRY_CD, REGN_CD ,PROD_TYPE_CD FROM DPT_NEW_BINS o
WHERE EXISTS (SELECT BIN,LEFT(ACCT_NUM_MIN,16), LEFT(ACCT_NUM_MAX,16), ISO_CTRY_CD, REGN_CD ,PROD_TYPE_CD FROM DPT_temp_NEW_BINS i
WHERE o.ACCT_NUM_MIN = i.ACCT_NUM_MIN AND o.ACCT_NUM_MAX = i.ACCT_NUM_MAX))
CAN SOMEBODY POINT OUT MY MISTAKE?
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May 24, 2007
No transaction log involved, only the table itself.
Use sp_spaceused "table_name" to check the space used.
It seems the table size actually increased from the beginning to the middle of deletion, at the end of deletion, its size decreased.
Recovery mode set to be simple, autoshrink turned on.
The tables tested are about 50MB ~ several GB in size, all have the same behavior. The size increased about 5%~10%.
Since the deletion is called from another software, I want to know if it is possible for SQL Server to have this behavior or it is absolutely the 3rd party software's issue
Thanks!
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Sep 19, 2006
We can know easily a database disk size, but can we konw a table in SQL 2005 database possess size? and more, how can I know the records in SQL 2005 Table possess size space?
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Jul 2, 2015
I need to partitioning the table on which most expensive query run.
Every day 500000 lac records inserted/update in that table
How to create what impact on performance while retrieving the records.
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Apr 30, 2015
I am trying to multiple update records in Table B from a single record in Table A. To identify the records that need to be updated I used this:
Select
Table1.cfirstnameas'Table
1 First',Table1.clastnameas'Table
1 Last',Table1.ifamilyid,CR.icontactid,CR.lLiveswithStudent,
Table2.cfirstnameas'Table
2 First',Table2.cLastNameas'Table
2 Last',Table2.ilocationidas'Table
2 Location',Table1.iLocationIDas'Table
1 Location'
fromTable1
JoinTable3
CRonTable1.istudentid=CR.istudentid
JoinTable2
onCR.icontactid=Table2.iContactID
whereCR.lLivesWithStudent=1
andTable1.ifamilyid>0
andTable1.ilocationid<>Table2.iLocationIDandTable1.lCurrent=1
I need to update the ilocationid from Table 1 to all Table 2 records related to Table 1but there is no direct relation from Table 1 to Table 2. I needed Table 3 to make the connection from Table 1 to 2.
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Mar 14, 2008
I have recently installed SQL server 2005 express edition along with Sql server management studio expressI have run the installation twice and during the installation I have created two instances of SQL server one named instance having Windows authentication and the other default instance having mixed mode authentication. Now I want to delete the named instance. Could anybody tellme I can delete the named instance?
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Jul 6, 2015
In SQL 2012 I'm trying to delete a log file (both physically and logically). There are two log files and one of them is unnecessary. When I click 'remove' in SSMS it will delete the log file, but then when I go back under database properties it's still showing up even though the file has been physically removed from the OS. I'm wondering what steps I can take to get rid of the file permanently?
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Aug 9, 2007
Hi
i have to delete the master table data without deleting the child table records,is there any solution for this, parent table has relation with the child table.
regards
vinod.t.v
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May 20, 2015
In on of the server tempdb is not releasing the reserved space after completion of data loads,as of now 99% of free space available in data file,we tried to shrink the datafile ,and space has not been released.
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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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Jun 15, 2015
today I've put in production a big database accessed by 200 concurrent users, this database has READ_COMMITTED_SNAPHOT set to ON.I know that RCSI set to ON is very aggressive on tempDB so I'm monitoring it.I've noticed that the Transaction log space usage (%) on TempDB is slowly but ever increasing, I mean in the last 24 hours I've started from a 99% space free, now we are 37% space free...is it normal? TempDB log is 35GB in size.
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Apr 22, 2015
I have scenario where I have process that loades data into SQL server 2012 database by doing some manipulation on data like sorting , aggregation, etc. Once this process is completed it's not free up the Tempdb space. If I restart the database, then it does.
is there any way (apart from shirking) to release space for Tempdb, like writing some post SQL queries to delete/ truncate the data and logs from temp db?
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Jul 12, 2004
I must admit I dont know all that much about SQL, which is why I hope someone can show me the light. I have a script almost finished, however I have no idea how to have it trim database entries that are older than, say, 90 days. Any ideas?
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Feb 25, 2005
I have a table with a load of orphaned records (I know... poor design)
I'm trying to get rid of them, but I'm having a brain cramp.
I need to delete all the records from the table "Floor_Stock" that
would be returned by this select statement:
SELECT FLOOR_STOCK.PRODUCT, FLOOR_STOCK.SITE
FROM PRODUCT_MASTER INNER JOIN
FLOOR_STOCK ON PRODUCT_MASTER.PRODUCT =
FLOOR_STOCK.PRODUCT LEFT OUTER JOIN
BOD_HEADER ON FLOOR_STOCK.PRODUCT =
BOD_HEADER.PRODUCT AND FLOOR_STOCK.SITE =
BOD_HEADER.SITE
WHERE (BOD_HEADER.BOD_INDEX IS NULL) AND
(PRODUCT_MASTER.PROD_TYPE IN ('f', 'n', 'k', 'b', 'l', 's'))
I was thinking along the lines of:
DELETE FROM FLOOR_STOCK INNER JOIN
(SELECT FLOOR_STOCK. PRODUCT, FLOOR_STOCK.SITE
FROM PRODUCT_MASTER INNER JOIN
FLOOR_STOCK ON PRODUCT_MASTER. PRODUCT =
FLOOR_STOCK.PRODUCT
LEFT OUTER JOIN BOD_HEADER ON FLOOR_STOCK. PRODUCT =
BOD_HEADER. PRODUCT AND FLOOR_STOCK.SITE = BOD_HEADER.SITE
WHERE (BOD_HEADER.BOD_INDEX IS NULL) AND
(PRODUCT_MASTER.PROD_TYPE IN ('f', 'n', 'k', 'b', 'l', 's'))) F ON
FLOOR_STOCK. PRODUCT = F. PRODUCT
AND FLOOR_STOCK.SITE = F.SITE
... but Sql Server just laughs at me: "Incorrect Syntax near the keyword INNER"
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Mar 3, 2004
How do I delete one record from one table and cascade down all related tables?
Mike B
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Aug 14, 2006
Hey all,
Here is the scenario. I'm working with two tables:
Contact1
Conthist
Contact1 contains basic contact information and conthist contains history records for those contacts. Conthist can hold many records related to a single contact1 record.
The link between the two tables is a column called accountno.
I'm trying to delete any records in conthist that have an accountno that does not exist in contact1. The queries that I've tried keep returning conthist records that do actually have a matching accountno.
Any help would be appreciated.
Thanks,
Tony
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Apr 12, 2007
Whenever I try to delete records from a table joined to another table, like so:
DELETE [tblTransaction Detail Local] FROM [tblTransaction Detail Local], [tblTransaction Header] WHERE ([tblTransaction Detail Local].[Transaction ID] = [tblTransaction Header].[Transaction ID]) AND ([tblTransaction Header].[Computer ID] = 3)
I get the error:
Major Error 0x80040E14, Minor Error 25501
> DELETE [tblTransaction Detail Local] FROM [tblTransaction Detail Local], [tblTransaction Header] WHERE ([tblTransaction Detail Local].[Transaction ID] = [tblTransaction Header].[Transaction ID]) AND ([tblTransaction Header].[Computer ID] = 3)
There was an error parsing the query. [ Token line number = 1,Token line offset = 38,Token in error = FROM ]
This is an SQL CE database, and SQL Server Management Studio. Any ideas?
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May 18, 2006
I have a couple SQL tables that have been appended to daily over the last two years. There is now about 50,000,000 records in the table. Does anyone know the fastest way to delete records before a certain date to shorten these tables? Delete queries and everything else I've tried is taking way too long.
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