The Best Way To Delete A Huge Number Of Records In Table
May 30, 2008
Hi Everyone,
We have a large test database with million of records for more than company site Code. Sometime we want to refresh the data of that database for one or more site Codes.
In order to do that I have to delete all records of the site code we want to refresh on the test database first then copy a new set of data from production database over. Since we refresh data based on the site code therefore I have to use the Delete command instead of Truncate.
Since this is a huge database with thousand of tables and million of records per table I have a performance issues with delete command. So what would be the best to delete a large number of records without writing any information to database log file?
FYI: The Recovery model of this database is Simple
Regards,
Jdang
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Jul 20, 2005
Hi All,I've the following table with a PK defined on an IDENTITY column(INSERT_SEQ):CREATE TABLE MYDATA (MID NUMERIC(19,0) NOT NULL,MYVALUE FLOAT NOT NULL,TIMEKEY INTEGER NOT NULL,TIMEKEY_DTTM DATETIME NULL,IID NUMERIC(19,0) NOT NULL,EID NUMERIC(19,0) NOT NULL,INSERT_SEQ NUMERIC(19,0) IDENTITY(1,1) NOT NULL)GOALTER TABLE MYDATAADD CONSTRAINT PK_MYDATAPRIMARY KEY (INSERT_SEQ)GOThe TIMEKEY_DTTM field is generated, from the value actually insertedinto theTIMEKEY field, by the following trigger:CREATE TRIGGER TIMEKEY1ON MYDATAFOR INSERT ASBEGINDECLARE @M_TIMEKEY_DTTM DATETIMESELECT @M_TIMEKEY_DTTM = DATEADD(SECOND, INS.TIMEKEY +EP.GMT_OFFSET * 0 ,'1970-01-01 00:00:00.000')FROM INSERTED INS, LOCATIONINFO EPWHERE INS.EID = EP.EIDUPDATE MYDATASET TIMEKEY_DTTM = @M_TIMEKEY_DTTMFROM INSERTED INS, MYDATA MDWHERE MD.INSERT_SEQ = INS.INSERT_SEQENDGOThere is also a composite, non unique, index defined on thetuple:(MID,IID,TIMEKEY,EID)CREATE INDEX IX_METDATA ON MYDATA (MID,IID,TIMEKEY,EID)GOAs a consequence of an application design change, I would also changethis index to be UNIQUE, but when I try to drop and create it I get anerror, because the tables stores some duplicated rows...In order to succesfully upgrade the index definition, I wrote some DMLstaementsto lookup and remove the duplicated rows, keeping only the firstrecord inserted, i.e. the one with the lowest INSERT_SEQ:---- This table stores then umber of duplicated records eventuallydiscovered-- into the MYDATA table; the initial value for the NUM_DUPLICATESfield is-- 0 (no duplicated record)--DROP TABLE DUPLICATESGOCREATE TABLE DUPLICATES (TABLENAME VARCHAR(17),NUM_DUPLICATES NUMERIC(19,0) )GOINSERT INTO DUPLICATES VALUES ('MYDATA',0)GOINSERT INTO DUPLICATES VALUES ('CATEGORIESDATA',0)GO---- ///////// CLEAN UP OF MYDATA TABLE--DROP TABLE TMP_MYDATAGOCREATE TABLE TMP_MYDATA (MID NUMERIC(19,0) NOT NULL,TIMEKEY INTEGER NOT NULL,IID NUMERIC(19,0) NOT NULL,EID NUMERIC(19,0) NOT NULL,INSERT_SEQ NUMERIC(19,0) )GO---- Insert into the TMP_MYDATA table all the duplicated records for-- the tuple (MID,IID,TIMEKEY,EID) and NULL for the INSERT_SEQ field--INSERT INTO TMP_MYDATA (MID,IID,TIMEKEY,EID)SELECT MID,IID,TIMEKEY,EIDFROM MYDATAGROUP BY MID,IID,TIMEKEY,EIDHAVING COUNT(*)>1GO---- Updates the INSERT_SEQ field to the lowest value in the group-- of duplicated records--UPDATE TMP_MYDATASET TMP_MYDATA.INSERT_SEQ = (SELECT MIN(INSERT_SEQ)FROM MYDATAWHERE TMP_MYDATA.MID = MYDATA.MID ANDTMP_MYDATA.IID = MYDATA.IID ANDTMP_MYDATA.TIMEKEY = MYDATA.TIMEKEY ANDTMP_MYDATA.EID = MYDATA.EID )GO---- Updates the value of NUM_DUPLICATES for the MYDATA table.--UPDATE DUPLICATESSET NUM_DUPLICATES = (SELECT COUNT(*) FROM TMP_MYDATA)WHERE TABLENAME = 'MYDATA'GO---- Delete from the MYDATA table all the duplicated records,-- keeping only the row with the lowest INSERT_SEQ-- The delete is performed only if there are duplicated recors;-- this is achieved using a "short circuit" AND on the number ofrecords-- stored into the NUM_DUPLICATES field of the DUPLICATES table for-- the MYDATA table...--DELETE FROM MYDATAWHERE ( SELECT NUM_DUPLICATES FROM DUPLICATES WHERE TABLENAME ='MYDATA') > 0 ANDEXISTS ( SELECT 1FROM TMP_MYDATAWHERE MYDATA.MID = TMP_MYDATA.MID ANDMYDATA.IID = TMP_MYDATA.IID ANDMYDATA.TIMEKEY = TMP_MYDATA.TIMEKEY ANDMYDATA.EID = TMP_MYDATA.EID ANDMYDATA.INSERT_SEQ > TMP_MYDATA.INSERT_SEQ )GOThis tecnique works fine on a normal table (1M recs) but is not veryperformanton huge tables (>10M records)!Do you know a better way to achieve the task of removing all theduplicates records, preserving the lowest INSERT_SEQ betwee theduplicates and also preserving the sequence seed, so that a new recordinserted at time t1>t0 is enumerated with an INSERT_SEQ|t1 >max(INSERT_SEQ)|t0 ?Thanks a lot for your help!PatrizioPS. sorry for such a large post!
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Jan 15, 2004
Hi,
My DB size (Right click on DB Name, Data Files tab, Space Allocated field) was 10914 MB.
I delete a huge table (1.2 million records * 15 columns).
I checked the db size again. It didnt change.
Shouldn't it decrease because I delete a huge table ??
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Jan 24, 2008
Hi
I have a table (Sql server 2000) which has 14 cost columns for each record, and now due to a new requirement, I have 2 taxes which needs to be applied on two more fields called Share1 and share 2
e.g
Sales tax = 10%
Use Tax = 10%
Share1 = 60%
Share2 = 40%
So Sales tax Amt (A) = Cost1 * Share1 * Sales Tax
So Use tax Amt (B) = cost1 * share2 * Use tax
same calculation for all the costs and then total cost with Sales tax = Cost 1 + A , Cost 2 + A and so on..
and total cost with Use tax = Cost1 +B, Cost 2 +B etc.
So there are around 14 new fields required to save Sales Tax amt for each cost, another 14 new fields to store Cost with Sales Tax, Cost with Use tax. So that increases the table size.
Some of these fields might be used for making reports.
I was wondering which is a better approach out of the below 3:
1) To calculate these fields dynamically while displaying them on the User interface and not save in DB (while making reports, again calculate these fields dynamically and show), or
2) Add new formula field columns in database table to save each field, which would make the table size bigger, but reporting becomes easier.
3) Add only those columns in database on which reports needs to be made, calculate rest of the fields dynamically on screen.
Your help is greatly appreciated.
Thanks
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Jan 24, 2008
Hi
I have a table (Sql server 2000) which has 14 cost columns for each record, and now due to a new requirement, I have 2 taxes which needs to be applied on two more fields called Share1 and share 2
e.g
Sales tax = 10%
Use Tax = 10%
Share1 = 60%
Share2 = 40%
So Sales tax Amt (A) = Cost1 * Share1 * Sales Tax
So Use tax Amt (B) = cost1 * share2 * Use tax
same calculation for all the costs and then total cost with Sales tax = Cost 1 + A , Cost 2 + A and so on..
and total cost with Use tax = Cost1 +B, Cost 2 +B etc.
So there are around 14 new fields required to save Sales Tax amt for each cost, another 14 new fields to store Cost with Sales Tax, Cost with Use tax. So that increases the table size.
Some of these fields might be used for making reports.
I was wondering which is a better approach out of the below 4:
1) To calculate these fields dynamically while displaying them on the User interface and not save in DB (while making reports, again calculate these fields dynamically and show), or
2) Add new formula field columns in database table to save each field, which would make the table size bigger, but reporting becomes easier.
3) Add only those columns in database on which reports needs to be made, calculate rest of the fields dynamically on screen.
4) Create a view just for reports, and calculate values dynamically in UI and not adding any computed values in table.
Your help is greatly appreciated.
Thanks
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Jul 6, 2015
I have a CTE query against a table with 32K rows that runs fine in 2008R2. I am running it in 2014 Std Ed. against the same data and it runs very slowly. Looking at the execution plan I think I see what's contributing to the slowness.
Note that the "actual number of rows" is some 351M...how is this possible?
the query:
declare @amts table (claim int,allowed decimal(12,2),copay decimal(12,2),deductible decimal(12,2),coins decimal(12,2));
;with unpaid (claimID) as (select claimID from claim where amt+copay + disct+mm + ded=0)
insert @amts
select lineID, sum(rc), sum(copay), sum(deduct),
case when sum(mm)>0 and (sum(mm)<sum(mmamt)) then sum(mm) else 0 end
from claimln
where status is null
and lineID not in (select claimID from unpaid)
group by lineID
it's like there's some massively recursive process going on?
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Dec 21, 2005
In
one of our forth coming projects, with ASP.Net/C#/MSSQL Server, We have
to deal with a Business table having about 15 millions of records. We
want to know, that which methodologies should we adopt, both regarding
front end and back end perspective, so the site could give optimised
performance. Also in place of a Dedicated Server, the Hosting Company
provides MSDE (that come with .net). Will this create any problem with
this project, that have such a huge table? Should we go for some
advanced database technique, such as, Clustering, Spliting Tables, etc.
Followings are the fields that the business table contains:
ID, Category ID (which comes from a Category table, each business is
under a category), BusinessName, SignupDate, Address1, Address2, Phone
Number,
Hours Of Operation, Years in Business, LicenseNumber, DiscountCoupon, Website
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Sep 8, 2015
I have the following scenario:
SQL database on SQL 2012
Large Production table 15 Million record
The table has 3 years of data
New monthly data is being added every month.
A New Monthly data is being loaded, checked and finally approved after 6 or 7 iteration before approval.Because of this iteration the monthly data set is being added then deleted then added then deleted few times.Because the table is big this process takes time, any thoughts on how to make the delete insert process faster.Keep in mind I cannot do much because it is a production table and is being access by other users to do other analysis.
Delete is done based on trx_date which is a year/month combo, like 201508.
The table has monthly sales by customer aggregated.
The table structure is:
CREATE TABLE [dbo].[Sales](
[batch_key] [int] NOT NULL,
[Company_key] [int] NOT NULL,
[customer_key] [char](22) NOT NULL,
[Trx_Date] [int] NOT NULL,
[account] [nvarchar](35) NOT NULL,
[code].....
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Jun 29, 2015
I need to delete records from a table (Table1) which has a foreign key column in a related table (Table2).
Table1 columns are: table1Id; Name. Table2 columns include Table2.table1Id which is the foreign key to Table1.
What is the syntax to delete records from Table1 using Table1.Name='some name' and remove any records in Table2 that have Table2.table1Id equal to Table1.table1Id?
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Apr 3, 2000
SQL 7 SP1 NT4 SP5
I have a TRANSACTION table with 150 million rows.
I have a USER table.
Each user has about 600 records in the TRANSACTION table.
The TRANSACTION cluster index is on USERID + RECID . The second index is on USERID + Fieldx + Fieldy.
The TRANSACTION table gets about 1.4 million inserts in a normal day and about 40,000 updates.
I want to go through the USER table and delete all users who have not visited me in a while.
I want to do this without substantially hindering performance in a production environment. I can perform this over a week period or two if needed.
The best way I thought of doing this was to grab x amount of users in a cursor and loop through deleting their corresponding TRANSACTION records.
Does anyone have any ideas on a better way. What is going to happen to my indices during this time ?
Thanks !!!
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Mar 17, 2008
I need to delete all records in the TBL_PCL_LENS_DATA table that do not have a corresponding record in the TBL_VERIFICATION table.
Primary Table: TBL_PCL_LENS_DATA
PK: Serial Number
PK: ProcessedDateTime
Child Table: TBL_VERIFICATION
PK: Serial Number
Thanks,
Sean
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Feb 15, 2006
how to delete a very huge log file, to free up some harddisk space
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Jul 20, 2005
:confused: Urgent!!
Hi there. I use MS SQL server. I would like to separate the data from one table to two tables refer to two reference tables and the following conditions:
Let say these two reference tables are called:
Table A & Table B
Group A:
1. Same date in Table A & Table B
2. Same ID in Table A & Table B (ID is not unique)
3. Same name in Table A & Table B (Name is not unique)
Combine all of these three conditions for unique identifier.
I used the following SQL code to separate the required data that match the above conditions to the new table.
(Code)
select a.Project, a.Site, a.S_number, a.Field_ID, a.Method, a.Analyte, a.Result, a.Units,
a.Qualifier, a.Dilution_Factor, a.Reporting_limit, a.Recovery_, a.Matrix, a.CAS_Number, a.Sample_Date,
a.Received_Date, a.Prep_Date, a.Analysis_Date, a.Batch_ID, a.Data_Package_num_SDG, a.Lab_Sample_ID,
a.Lab into APPL_union_exist from APPL_union_update a, Before_01012004_report b
where a.Field_ID = b.[Field Sample] and a.Sample_Date = b.Collected and a.Analyte = b.Analyte
However, I don't know how to delete the data that copied to the new table in original table, or separate that to the new table. Wish someone can help me. Thanks a lot
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Nov 29, 2004
Hello All,
Please show me how to delete duplicate records from a table.
Thanks in Advance
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Oct 6, 2006
hi,
i have a table in which 100 rows are there . i have duplicate rows. so ho can i remove it . suggest me a command
One can never consent to creep,when one feels an impulse to soar
RAMMOHAN
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Jul 20, 2005
I uploaded some data about 2 or 3 times and it keep appending it to thetable.Now I want to keep only first duplicate and delete rest of.Suppose part number 123 has been added 3 times so I want to keep only 1record.Thanks
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Mar 4, 2008
Hello Frnds....Can anybody give the answer of this question as How to Delete duplicate records from Table ?
I Know that with check option and also with Unique Constraint we can avoid to enter duplicate records in table but How to delete from table which does not have any constraints ?
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Nov 15, 2006
Hello, I'm developing application which monitors network packets. The monitoring data are saved into table. Monitoring table maintains the data for fixed quantum time,for example during one 1 hour. So, every minute before or after insert new data, I delete the time-expired data. I doubt that the endless delete operation would results in some problems(increasing index,etc..).
Is this mechanism safe to the dbms?
Aren't there round-robin(?) style table?
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Jul 2, 2007
Short Question: How do I delete all records from a destination table prior to appending new data to that table?
I am working with a SQL database that was migrated from MS Access. All relationships, primary keys, and identity columns have been set identically to the MS Access database values. The MS Access database is still being used as the database of record until the SQL database is fully functional with front-end, etc.
I want to delete the information stored in all the SQL tables, and then append the MS Access values to the SQL tables. I was able to write delete and append queries in MS Access to correctly transfer data to the SQL tables. However, I would prefer doing this through SSIS because I have several other sources of data to move to a SQL Server database and most of those other sources are not a MS Access database.
Due to relational entegrity settings, I need to delete the records from 8 tables in a specific order. I have tried independent control objects for each of the 8 tables with data flow objects of either "OLE DB Command" or "OLE DB Source" with the SQL command as "Delete From TableName". Results of the debug indicate everything is "green" but no records were deleted fromt the tables.
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Jun 13, 2007
Hello,
I have been serching for weeks to resolve this problem. I am new to ASP.NET and trying to make the migration from ASP which I have programmed in for years. I am using Microsoft Visual Web Developer 2005 Express Edition and SQL Express Edtion. I have been working through the Microsoft Video Training at http://msdn.microsoft.com/vstudio/express/beginner/learningpath/ and created a web site using Tier 3 Lesson 8 as the model. My new web site which is a simple phone book applicaiton lets me read the table and select the record without any problem. But the update form lets me edit but when I attempt to Apply the update I get the following error.
Server Error in '/Phonebook' Application.
ObjectDataSource 'ObjectDataSource1' could not find a non-generic method 'Update' that has parameters: FirstName, LastName, PhoneNumber, BossGroup, Department, BossPickup, ShowInPhonebook, Type, Original_FirstName, Original_LastName, Original_PhoneNumber, Original_BossGroup, Original_Department, Original_BossPickup, Original_ShowInPhoneBook, Original_Type, Original_ItemID.
Description: An unhundled expception occured during the execution of the current web request. Please review the stack trace for more information about the error and where it originiated in the code.
The Stack Trace basiclly showes the same error as above.
Also, when I attempt to delete the record I do not get an error but the record does not delete.
What is interesting is that I can add a record so I do not believe that it is a security permissions issue. I have the ISS Authinication Method Enable Anonymous Access set on with full control.
If anyone has any insight as to why this is occuring please let me know.
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Aug 5, 2002
Hi ,
I have a scheduled job which does an text file import in my database . The data gets appended in my table every day from this import job .
Since my table is growing every day , i want to truncate the table after the data has been collected for three months i.e 90 days . The table will be empty and the new data will flow in through the import .
Any thoughts how to do it through query and schedule it ???
Thanks
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May 5, 2006
Hi everyone,
I have a task to create a dts package, which will delete records in a SQL table, which are present on a sheet tab in Excel. I know how to transfer records from Excel to SQL table and vice versa, but not sure how I can delete the records in SQL table, which are present in Excel. Note that there are just 2 columns - one is a key and the other name.
Thank you all in advance,
Saurav
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May 21, 2013
So I've stumbled across an audit table on one of our systems that has reached a hearty 180M rows in size.
The table is a heap (no indexes whatsoever).
Each record has a datetime value indicating when it was created.
I need to delete everything that was created prior to the last 6 months; what is my best plan of attack?
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May 2, 2014
using below query
DELETE FROM Table_name
WHERE Date_column < GETDATE() - 30
am able to delete old records morethan 30 days, but i want to results to be saved in file.
before deleting i want to a craete a file and save the to be deleted records.
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Jul 22, 2013
DELETE FROM [SCS_NAV2009R2_PROD].[dbo].[Payroll Ledger Entry]
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Msg 9002, Level 17, State 4, Line 1
The transaction log for database 'SCS_NAV2009R2_PROD' is full. To find out why space in the log cannot be reused, see the log_reuse_wait_desc column in sys.databases
~ 7,000,000 records
now i have set the log to autogrow and set the max size to 2tb
what else can i do to get this going?
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Feb 26, 2006
Hi, I would like to delete some records in a table older than a specified date using a stored procedure. Can anyone help?
Thank you,
Cynthia
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Mar 19, 2007
Dear Friends!
i have one table namely details
empid type qty
emp1 bucket 5
emp2 bucket 5
emp4 Book 5
emp5 Lux 5
.. .. ..
.. .. ..
nenp n n
Every end of the day i need select total no of type and qty.i have milions of records in the table
ex bucket 100
book 300
How it is possible
Regards
Umapathy
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Feb 13, 2008
How can I restrict the number of records in a table in SQL Server 2005, please?
Thanks
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Feb 17, 2008
Is there a way that I can reset the key field to 1 when using DELETE to clear a table?
(Note: if there is a separate command that I could use after the DELETE, that is fine too.)
Thank you for your help with this,
-DJ
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Apr 22, 2015
I am using a SQL Server Agent jobs that run each morning to update the records in a table to match what they should be for that day. I built them and tested it using a test table called "testtable1". It worked fine. But when I switched over to our production table, it fails saying the table has to be decaled. What would be the difference. The production table has a "@" in front of the name, is that causing issues?
USE [Live_build]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
BEGIN
DELETE
FROM @ZIPLIST
INSERT INTO @ZIPLIST
SELECT * FROM tblZip3DSWed;
END
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Sep 24, 2007
Hi guys,
Is there any function to get the total number of records in a specific table?
(SQL SERVER 2000).
Thanks in advance,
Aldo.
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Jul 20, 2005
I have been searching many postings and I cant seem to find anyonethat has this answer so I decided to post. I am using SQL(Transact-SQL).If I have 2 tables with columnsacct_num,activity_date,and pay_amt and I want to delete one instanceof a record in table 1 for every instance of that record in table 2how could I do that. For example.Table 1-----------acct activity_date pay_amt123 5/1/2004 50.00123 5/1/2004 50.00123 5/1/2004 50.00123 5/1/2004 50.00123 5/1/2004 50.00Table 2-----------acct activity_date pay_amt123 5/1/2004 50.00123 5/1/2004 50.00I need a delete statement that will find 2 of the 5 records(It doesn'tmatter which 2) and delete them.Leaving table one looking like this.Table 1-----------acct activity_date pay_amt123 5/1/2004 50.00123 5/1/2004 50.00123 5/1/2004 50.00How can I do this??
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Feb 24, 2015
I've 2 tables ResumeSkill (Child table) and Skill (Parent table), There are duplicates in the parent table and after removing the foreign key constraint in child table deleted all duplicate values from Parent table. But those deleted duplicate values has references in child table which need to be deleted now.
ResumeSkill Skill
Id SkillId
SkillId Name
I want to delete all the records from ResumeSkill that dont have matching skillId in Skill table.
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