To Delete Or Not To Delete - DESIGN ISSUE!

Apr 3, 2008

Hi all

Need some advice solving a little problem I have with my database!

Current setup:

I have a person table that is made up of 39 columns. I also allow for person records to be deleted but I do this by having another table I call LogicallyDeletedrecords. This table is made up of the PersonId, Reason for deletion/suppression and a date time stamp. To access Live records I created a view based on my Person table which contains a WHERE clause to exclude records that exist in the LogicallyDeletedrecords. Similarly, I have another view DeadPersonData which contains Person records that have been removed. Hope it all makes sense so far! Now on to my worries!

The problem:

My Person table contains 9+ million records. The LogicallyDeletedrecords table has 500k+ but I anticipate further growth over the coming weeks/months. My worry is that my LivePersonData view will be too slow to access as my LogicallyDeletedrecords table grows. What’s more, as part of my Load routine, I have to make sure that Person data loaded on to the system is excluded if that same person exists as a deleted member. Both of these actions could slow down my system as the deleted table grows.

My thoughts:

I’ve been thinking of physically deleting dead Person records from my person table (possibly creating an archive table to hold them). But then if I delete them how do I cross check the details when new Person details get loaded?! As I said, my current LogicallyDeletedrecords table holds the PersonId, ReasonDeleted and CreationStamp. The only way is to add further columns which I use to match Person Details?

Any design suggestions would be welcome!

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a+, =)
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edit :
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First, this is not my code.

This one is weird and I am missing something fundamental on this one. A developer was getting a timeout with this...


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(
@SubmitterTranID VARCHAR(50)
)
AS
DECLARE
@COUNT INT,
@COMMIT INT

SET @COUNT = 0
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IF (@@ERROR <> 0)
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IF (@@ERROR <> 0)
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IF (@@ERROR <> 0)
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IF (@@ERROR <> 0)
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IF (@@ERROR <> 0)
SET @COMMIT = 0
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IF (@@ERROR <> 0)
SET @COMMIT = 0

IF (@COMMIT = 1)
BEGIN
--ROLLBACK TRANSACTION --For Testing Purpose ONLY
COMMIT TRANSACTION
RETURN (0)
END
ELSE
BEGIN
ROLLBACK TRANSACTION
RETURN (-1)
END
END
ELSE
BEGIN
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END
GO


I applied a couple of indices and got ride of the uncorrelated subqueries


CREATE PROCEDURE p_CM_DeleteBatch
(
@SubmitterTranID VARCHAR(50)
)
AS
DECLARE
@COUNT INT,
@COMMIT INT

SET @COUNT = 0
SET @COMMIT = 1 --DO NOT CHANGE THIS. The Operation will be commited only when this value is 1

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where (claimstatus NOT IN ('Keyed', 'Imported')) AND
SubmitterTranID = @SubmitterTranID

IF (@COUNT = 0) --This means that that Claims under this Batch have not been adjudicated & it is safe to delete
BEGIN
BEGIN TRANSACTION

DELETE INVOICECLAIMMAPPING
FROM INVOICECLAIMMAPPING
JOIN CLAIMSRECEIVED
ON INVOICECLAIMMAPPING.CLMRECDID = CLAIMSRECEIVED.CLMRECDID
WHERE CLAIMSRECEIVED.SUBMITTERTRANID = @SUBMITTERTRANID

IF (@@ERROR <> 0)
SET @COMMIT = 0

DELETE FROM ClaimsPayment
WHERE SubmitterTranID = @SubmitterTranID
IF (@@ERROR <> 0)
SET @COMMIT = 0

DELETE FROM ClaimsPaymentServices WHERE SubmitterTranID = @SubmitterTranID
IF (@@ERROR <> 0)
SET @COMMIT = 0

DELETE ClaimsreceivedPayorServices
FROM ClaimsreceivedPayorServices
JOIN ClaimsReceivedPayors
ON ClaimsreceivedPayorServices.ClmRecdPyID = ClaimsReceivedPayors.ClmRecPyID
WHERE ClaimsReceivedPayors.SubmitterTranID = @SubmitterTranID
IF (@@ERROR <> 0)
SET @COMMIT = 0

DELETE ClaimsReceivedPayors
FROM ClaimsReceivedPayors
JOIN ClaimsReceived
ON ClaimsReceivedPayors.ClmRecdid = ClaimsReceived.ClmRecdid
WHERE ClaimsReceived.SubmitterTranID = @SubmitterTranID

IF (@@ERROR <> 0)
SET @COMMIT = 0

DELETE FROM ClaimsReceivedServices WHERE SubmitterTranID = @SubmitterTranID
IF (@@ERROR <> 0)
SET @COMMIT = 0

DELETE FROM ClaimsReceived WHERE SubmitterTranID = @SubmitterTranID
IF (@@ERROR <> 0)
SET @COMMIT = 0

DELETE FROM BATCHLOGCLAIMS WHERE SubmitterTranID = @SubmitterTranID
IF (@@ERROR <> 0)
SET @COMMIT = 0

IF (@COMMIT = 1)
BEGIN
--ROLLBACK TRANSACTION --For Testing Purpose ONLY
COMMIT TRANSACTION
RETURN (0)
END
ELSE
BEGIN
ROLLBACK TRANSACTION
RETURN (-1)
END
END
ELSE
BEGIN
RaisError ('This Batch cannot be deleted. It has claim(s) which has been Adjudicated', 16, 1)
END
GO
SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS ON

GO


Suddenly this constraint was being violated with the change


ALTER TABLE [dbo].[ClaimsReceivedPayorServices] ADD CONSTRAINT [FK_ClaimsReceivedPayorServices_CLAIMSRECEIVEDPAYOR S] FOREIGN KEY
(
[ClmRecdPyID]
) REFERENCES [CLAIMSRECEIVEDPAYORS] (
[CLMRECPYID]
)


Is the delete on ClaimsReceivedPayors starting before the delete on ClaimsreceivedPayorServices finishes? If so why would it matter between the join and subquery? This one is making me depressed because I can not explain it.

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Hi All,
I got error message : "Msg 431,Level 16, State 0 Unable to bind foreignkey constraint. Too many tables involved in
query." when I tried to delete a record from a 'parent' table. Although, before the deletion, I already delete all related
records in 'children' tables whose fields references the key of that table.
I checked the 'object dependencies'and included all those tables that 'depends' on that 'parent' table in my delete SQL.
Anybody has any idea? I recall I read somewhere that's there's a limit (160 ... not sure) of tables that can reference to the key of
a 'parent' (master) table.
Thanks for all your help.
David Nguyen.

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Jun 17, 2004

I think its a really easy Q for those who know, I dont know a thing about sql but a contractor has stuffed me and I need to remove all the test data from a bunch of tables in a database.

Is there an easy way (or a way) to remove all the info in the rows of data in numerous tables without me messing up the tables for future use?

I though using query manager and just DELETE * FROM table_name

is that going to mess things up?

Appreciate the help.

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Sep 12, 2006

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Sep 22, 2006

I am having 2 tables :

products :

product_id (PK, int, not null)
reports_id (FK, int, not null)
name

reports :

reports_id (PK, int , not null)
dateR



If I : DELETE FROM reports WHERE reports_id = 100

how can I create a contraints in MS SQL 2000 that automaticly all the products with reports_id = 100 are deleted too ?

thank you

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May 29, 2007

what codes should i use if i want to delete a record in sql using vb6?.,

because this doesnt work..

Confirm = MsgBox ("Are you sure you want to delete this record?", vbYesNo, "Deletion Confirmation")
If Confirm = vbYes Then
adodc1.Recordset.Delete
MsgBox "Record Deleted!", , "Message"
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End If

-grrr.,they are teaching us about sql now??.,
gggrrrrrr!!!!.,our skuL is useless!.,

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Jan 6, 2004

Dear friends,

I have a table called CAT with a PK field ID_CAT where it data type is a varchar(30).
I can post it without any error type but if I send a statement for delete a record
using any fields in the table, the follow message error rise in a exception:


Project DigitalCAT2004.exe raised exception class EOleException with
message 'Syntax error converting the varchar value '01-02503/99' to a
column of data type int'. Process stopped. Use Step or Run to continue.

I´m using Delphi with ADO components for acess the server, with Command component
where I´m using the follow statement :

CMD.CommandText:='DELETE FROM CAT WHERE ID_CAT='+Edit1.Text;
CMD.Execute;

Please somebody help me cos I don´t know more what I can do.
Thanks for attetion

Leonardo Almeida

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