Transact SQL :: Paging Of Records Which Are Keep Updating

May 7, 2015

I would like to use the following code for querying summary records with paging.

DECLARE @PageNumber AS INT, @RowspPage AS INT
SET @PageNumber = 1
SET @RowspPage = 10
SELECT * FROM (
SELECT ROW_NUMBER() OVER(ORDER BY create_date) AS NUMBER,
* FROM summary
) AS TBL
WHERE NUMBER BETWEEN ((@PageNumber - 1) * @RowspPage + 1) AND (@PageNumber * @RowspPage)
ORDER BY create_date

Paging is implemented for fast response since the data pool is very large up to 10000000.

The above query works fine in testing. However, in reality, since new records are keep inserting to the tables, I have concern about the accuracy of viewing another page of result.

E.g.  At 12:00pm, the result of page 1 (5 per page)  is
R20, R19, R18, R17, R16

After 2 mins, 12:02pm, the user press next page button
Since records R21, R22, R23, R24, R25, R26 are inserted
page 2 result would be R21, R20, R19, R18, R17

So the result is showing many records same as page 1 which has already been seen. Could this situation be improved?

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Jul 21, 2015

I am trying to update a large table which consists of 45 million records , it is taking more than 2 days to the update , below is my approach

1. The table has only one clustered index and no other indexes on the table.
2. I am updating in batches say 20000 record-wise.
3. Changed the recovery mode to bulk logged and auto-growth size is set to  300MB and there is enough space in my disk for transaction log .

But still the query is running slowly.

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Jan 24, 2007

I am using derived tables to Page data on the SQL Server side.I used this link as my mentor for doing paging on the SQLServerhttp://msdn2.microsoft.com/en-us/library/ms979197.aspxI wanted to use USER PAGING, thus I used the following code:CREATE PROCEDURE UserPaging(@currentPage int = 1, @pageSize int =1000)ASDECLARE @Out int, @rowsToRetrieve int, @SQLSTRING nvarchar(1000)SET @rowsToRetrieve = (@pageSize * @currentPage)SET NOCOUNT ONSET @SQLSTRING = N'selectCustomerID,CompanyName,ContactName,ContactTitle from( SELECT TOP '+ CAST(@pageSize as varchar(10)) +'CustomerId,CompanyName,ContactName,ContactTitle from( SELECT TOP ' + CAST(@rowsToRetrieve as varchar(10)) +'CustomerID,CompanyName,ContactName,ContactTitle FROM( SELECT TOP ' + CAST(@rowsToRetrieve as varchar(10)) +'CustomerID,CompanyName,ContactName,ContactTitle FROM Customers as T1ORDER BY contactname) AS T2 ORDER BY contactname DESC ) AS T3)As T4 ORDER BY contactname ASC'EXEC(@SQLSTRING)RETURNGOWhen I use this. Assume that the Total records returned by the SQLquery is 1198.Thus when I am on Page1 the above Stored Proc (SP) willreturn the first 1000 records.This works absolutely fine.Now I am on Page2, now I need to retrieve only the remaining 198records.But if I use the above SP, it will return the last 1000records.So to tweak this I used the following logic to set the@pagesize variable:Declare @PageCount intselect @PageCount = @TotalRows/@PageSizeif @currentPage @PageCount SET @PageSize = @TotalRows%@PageSizeSince I am on Page2 the above logic will set the PageSize to 198 andnot 1000.But when I use this logic, it takes forever for the SP toreturn the 198 records in a resultset.However if the TotalRows were = 1800, and thus the PageSize=800 orgreater, this SP returns the resultset quickly enough.Thus to get over this problem I had to use the other logic i.e. usingApplication Paging (i.e. first storing the entire result set into aTemp table, then retrieving only the required records for the PAGE)Can anyone suggest what is wrong with my user paging logic?????TIA...

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Quote:

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Is there any SQL Server hints to avoid blocking ..

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Jan 25, 2007

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thanks,
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First off, Ive been asking a lot of questions lately and I want to sincerely thank those who have been posting VERY helpful replies. I have learned much in these past few weeks.

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Here is my code that updates the table (without regard for uniquneess):


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Ive posted on here many times before and got the answers, so hopefully this time will be like the rest...you guys are SO good at SQL.

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Now here comes the problem...

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We want a simple where we export all our contacts and then format them so they include website1, 2 and 3. THEN we want to import them, simply updating the contacts with that new data. (Or is there a SQL way of creating temp tables so these fields dont even need to be included in the db?)

I hope i managed to explain myself in way you can all understand.

Thanks

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Mar 8, 2000

Hello Everyone,

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2) if two records are duplicate, I want to mark Record B as "Dup" in col4 ;

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I have tried to use CURSOR for the job. I would appreciate if anyone can give me some hints for updating records using Cursor.

My script looks like this:
CREATE PROC Mark_duplicate
AS
DECLARE @var1_a, /* To hold the data from Record A */
@var2_a,
@var3_a,
@var4_a,
@var5_a,

@var1_b, /* To hold the data from Record B */
@var2_b,
@var3_b,
@var4_b,
@var4_b,

/*** Create a CURSOR ***/
DECLARE Dup CURSOR
FOR SELECT col1, col2, col3, col4
FROM TableA ORDER BY col1, col2
FOR UPDATE OF col1, col2, col3, col4

/**** OPEN the CURSOR ****/
OPEN Dup
FETCH NEXT FROM Dup into @var1_a, @var2_a, @var3_a, @var4_a
WHILE ( @@FETCH_STATUS =0 )
BEGIN
FETCH NEXT FROM Dup into @var1_b, @var2_b, @var3_b, @var4_b
WHILE ( @@FETCH_STATUS =0 )
BEGIN
If ( @var1_a = var1_b ) THEN
.
.Updating statements
.
.
ELSE
SET @VAR1_a = @var1_b, @VAR2_a = @var2_b,
@VAR3_a = @var3_b, @VAR4_a = @var4_b
FETCH NEXT FROM Dup into @var1_b, @var2_b, @var3_b, var4_b
END
END
CLOSE DUP
.
.
.

Thanks a lot. Have a good day!

Lunjun

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Meg writes "Hi,

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update stage
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where update_status = 0


Update transaction
Set aId = s.aId,
b = s.b,

from stage s
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Update stage
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where

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Thanks.
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Code Block

UPDATE Item SET LastActivityID = 27 WHERE LastActivityID = 8
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Dear All,

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Nov 29, 2006

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Feb 16, 2007

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set QUOTED_IDENTIFIER ON
GO

--CREATE PROCEDURE [dbo].[sp_AddNewOption_OptionMaster_WithLevel]


@BuilderIDint,
@OptionIDINT,
@CommunityID INT,
@PhaseID INT,
@SeriesID INT,
@PlanID INT,
@ElevationID INT,
@CurrentSalesPrice Smallmoney,
@LocalComments Nvarchar (500),
@RoomID int,
@Package bit,
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AS

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BEGIN
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END
ELSE BEGIN

--if the option record option does not exist, insert it

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SELECT ' Added to Option Master Successfully'
END

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