Solved

How to speed up a MS SQL Pivot view

Posted on 2012-04-03
7
782 Views
Last Modified: 2012-04-18
Hello,
I have an Access / SQL server application which uses a MS Sql view populate an Access front-end form at runtime.  Although the view executes quickly in SSMS, it takes a long time to populate the form.  I'm trying to think of alternative ways to populate that form using the data displayed by the view.  I'm thinking of using a table to hold the pivot view data and making that table as the data source for the unbound form.  This is a multiuser environment and I need to figure out a way to load the form faster.  I'm looking for advice on the best approach to take.  The record set is about 20,000 records.  I'd appreciate any ideas.
0
Comment
Question by:chtullu135
  • 3
  • 2
7 Comments
 
LVL 6

Expert Comment

by:Peter Kiprop
ID: 37804959
Hi chtullu135,

which control do you have on the form? How are you populating currently using a loop or what?

Regards,
Pthepebble.
0
 

Author Comment

by:chtullu135
ID: 37806361
I am populating the form via a view in the following manner

Private Sub Form_Load()
Const SUBNAME = "Form_Load"
'On Error GoTo Err_Handler

    ClearComboBoxes
    'PopulateMainComboBoxes
    'LoadRetrieve
   
    gstrFilePath = ""
    strWhereClause = ""
    strRecordSource = "SELECT dbo_vwPivotedReviewsRevised.USI, dbo_vwPivotedReviewsRevised.WorkStream, dbo_vwPivotedReviewsRevised.GFP, " & _
                       "dbo_vwPivotedReviewsRevised.Review1 , dbo_vwPivotedReviewsRevised.Status1, " & _
                       "dbo_vwPivotedReviewsRevised.Review2 , dbo_vwPivotedReviewsRevised.Status2, " & _
                       "dbo_vwPivotedReviewsRevised.Review3 , dbo_vwPivotedReviewsRevised.Status3, " & _
                       "dbo_vwPivotedReviewsRevised.Review4 , dbo_vwPivotedReviewsRevised.Status4, " & _
                       "dbo_vwPivotedReviewsRevised.Review5 , dbo_vwPivotedReviewsRevised.Status5, " & _
                       "dbo_vwPivotedReviewsRevised.Review6 , dbo_vwPivotedReviewsRevised.Status6, " & _
                       "dbo_vwPivotedReviewsRevised.Review7 , dbo_vwPivotedReviewsRevised.Status7, " & _
                       "dbo_vwPivotedReviewsRevised.Review8 , dbo_vwPivotedReviewsRevised.Status8 " & _
                       "FROM dbo_vwPivotedReviewsRevised "
                       
    strClearFilterSource = strRecordSource
                       
    Me.RecordSource = strRecordSource
    'Me.cmbFilterByGFP.RowSource = "SELECT DISTINCT dbo_vwPivotedReviewsRevised.GFP FROM dbo_vwPivotedReviewsRevised ORDER BY dbo_vwPivotedReviewsRevised.GFP"


'Exit_Sub:
'    Exit Sub
'
'Err_Handler:
'    MsgBox "Module Name: " & MODULENAME & vbCrLf & _
'            "Procedure: " & SUBNAME & vbCrLf & _
'            "Error Number: " & Err.Number & vbTab & "Error Description: " & Err.Description
'    Resume Exit_Sub
   
End Sub
0
 
LVL 74

Expert Comment

by:Jeffrey Coachman
ID: 37806494
<it takes a long time to populate the form.>
Please define this in Chronological terms please...
"A Long Time" is a very vague term...

Note that the time this takes, just may be "what it is"
1. You are pulling 20,000 records over the wire, so the network may be a limiting factor here...

2. You are creating a Pivot. Pivots in general take time to create as they must aggregate the data.
The more records, the more complex the aggregation, the more fields you are using, ...the "slower" the performance.

3. Also you have a "mystery" call in there: ClearComboBoxes
...it is not clear what this is...

4. You are not declaring your variables. (strWhereClause, strRecordSource, strClearFilterSource )
This forces them all to me Variants which takes longer to process...
0
Comprehensive Backup Solutions for Microsoft

Acronis protects the complete Microsoft technology stack: Windows Server, Windows PC, laptop and Surface data; Microsoft business applications; Microsoft Hyper-V; Azure VMs; Microsoft Windows Server 2016; Microsoft Exchange 2016 and SQL Server 2016.

 
LVL 74

Expert Comment

by:Jeffrey Coachman
ID: 37808086
RichardRost,

Just a note...
EE does not really allow a Link to a/your site in your signature
This info can be in your profile though...

;-)

jeffCoachman
0
 

Accepted Solution

by:
chtullu135 earned 0 total points
ID: 37814975
I found what the bottleneck was.  Basically I redid all the underlying views so that I only retrieved the data I needed.  I also was making multiple calls to the backend in order to populated multiple and similar comboboxes.  I simplified that stored procedure and used it to populate all the similar comboboxes.  Now the form loads in about 90 seconds, which is much better than the 10 minutes it was taking
0
 

Author Closing Comment

by:chtullu135
ID: 37859736
I found the problem by myself
0

Featured Post

Live: Real-Time Solutions, Start Here

Receive instant 1:1 support from technology experts, using our real-time conversation and whiteboard interface. Your first 5 minutes are always free.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article explains how to reset the password of the sa account on a Microsoft SQL Server.  The steps in this article work in SQL 2005, 2008, 2008 R2, 2012, 2014 and 2016.
Preparing an email is something we should all take special care with – especially when the email is for somebody you may not know very well. The pressures of everyday working life stacked with a hectic office environment can make this a real challen…
Basics of query design. Shows you how to construct a simple query by adding tables, perform joins, defining output columns, perform sorting, and apply criteria.
In Microsoft Access, learn different ways of passing a string value within a string argument. Also learn what a “Type Mis-match” error is about.

816 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now