Recall - Speed Up Linked DB
Dec 14, 2004
I've created an Access DB on a Citrix server which is multi user so has been split and user linked tables. It runs quite slow however. At the moment I don't have time to convert it to unbound forms, so have read that one solution to speeding it up is to create a table in the back end tables to the main DB. Then use the open recordset event to keep the link between the two open.
I know how to link the two, but can someone explain the open recordset part please. What do have to do?
Cheers,
Recall.
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Nov 23, 2004
I've created a linked table database which is running currently at my offices over a Citrix network. We want to put the database into 2 other sites (initially), however, the drive that all the sites see is slightly different for my site than the other sites (i.e. I see it as W: but they see it as P, but physically they are the same drive. Obviously, the links to the tables would have to be changed so the other FE could see the BE. I can't do this from my site as I cannot see the drive as they see it. I don't want them going into the FE design to update the linked table manager everytime I make changes and send them a new DB.
Does anyone know how (or have an example DB) to create a button on the FE that will ask the user to select the location of the BE with a file browser, for example and then update the table links.
Think this is a bit of a tough one, but I'm sure someone must have done it at some point.
Cheers,
Recall.
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Oct 18, 2005
Hi,
I have a growing Access database in a multi-user environment over a 10/100Mb network. The database is all in one file at the moment, on a shared directory of our XP-Pro 'Server', and the workstations have a mapped drive to it and are W98SE machines. All the machines are 1.2Ghz Fujitsu Siemens machines.
It is still under development, but is also in constant use, and I therefore have to develop on a copy, then get everyone out so I can copy in the changes. I would love it to be a client/server setup and split the db to Tables only backend on the server and progams on the client, but when I tried, the result was a dramatic slow-down in the system...it became unusable.
I do have a budget for this, and could get a proper 'server' or maybe an Ethernet Disk, but what is the best config for speed and admin purposes. Anyone doing something similar??
Thanks
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Apr 5, 2007
Hey,
I noticed something strange in access 2000: sometimes it takes a long time to calculate a report and other times it goes rapidly. I don't see any process taking a lot of CPU %.
When i do the same thing in Access2003, it goes rapidly every time.
Can anyone help me?
Rik
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Nov 2, 2005
I have a number of queries which build two or three Union queries which looks at 35,000 records, and when you open the Union queries or run reports it takes forever for them to open.
I have indexed all the tables which have the common fields to see if this speeds it up the queries, but there still slow. The table they look at are in two different tables which are linked into a front end where the queries are!
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Mar 24, 2006
I query against a table with 380K records and growing.
There are approx 14 fields in the table, but I only retrieve 7 in my query. Does having those extra fields in there slow the query down, or does the query ignore them?
Just trying to figure out ways to improve speed.
Thanks.
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May 23, 2007
Which is faster, placing a calculation
ItemNumber: IIf([MANITEMNO]<>" ",[MANITEMNO],[ITEM])
in a query or placing
=IIf([MANITEMNO]<>" ",[MANITEMNO],[ITEM])as a Control Source in a text field on a form or report :confused:
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Dec 19, 2007
I was brought up to believe in Santa Claus and that DLookups were slow. I browsed last night and found many threads mentioning speed issues with DLookups.
My latest project consists of upgrading a database written at a Client Site that is chock full of (you guessed it) DLookups. My normal inclination was to replace them with parameter queries. But before I did, I ran some benchmarks of DLookup vs Parameter Query speed. In all cases (table1 = 11 records, table2 = 1,143 records) the DLookup was faster.
My test was to lookup a field based on the recordset's primary key. In table2 I tested a record mid way down and the last record. DLookup is the winner hands down.
Should I also stop believing in Santa Claus. Too bad because I have a new notebook on my wish list.
Thanks for your wisdon.
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May 24, 2005
Can anyone offer suggestions as to why, when I split my db, place the backend on the server, and open Form2 my front end grows from 2.25MB to 3.95?
I was using macros to filter the data for each type of project and that does not affect the db size nearly as much as this does.
I am using the following code on the On_Click event of the "View Projects" button on Form2 to build the criteria for the records to appear on my "Projects" form.
Private Sub cmdOK_Click()
Dim varItem As Variant
Dim strSubtype As String
Dim strStatus As String
Dim strSubtypeCondition As String
Dim strSQL As String
Dim strSortOrder As String
Dim cat As New ADOX.Catalog
Dim cmd As ADODB.Command
For Each varItem In Me.lstSubtype.ItemsSelected
strSubtype = strSubtype & "," & Me.lstSubtype.ItemData(varItem)
Next varItem
If Len(strSubtype) = 0 Then
strSubtype = "Like '*'"
Else
strSubtype = Right(strSubtype, Len(strSubtype) - 1)
strSubtype = "IN(" & strSubtype & ")"
End If
For Each varItem In Me.lstStatus.ItemsSelected
strStatus = strStatus & ",'" & Me.lstStatus.ItemData(varItem) & "'"
Next varItem
If Len(strStatus) = 0 Then
strStatus = "Like '*'"
Else
strStatus = Right(strStatus, Len(strStatus) - 1)
strStatus = "IN(" & strStatus & ")"
End If
If Me.optAnd.Value = True Then
strSubtypeCondition = " AND "
Else
strSubtypeCondition = " OR "
End If
'Build the sort order
If Me.cboSortOrder1.Value <> "Not Sorted" Then
strSortOrder = " ORDER BY tblProjectDetails.[" & Me.cboSortOrder1.Value & "]"
Else
strSortOrder = ""
End If
'Build the SQL statement
strSQL = "SELECT tblProjectDetails.* FROM tblProjectDetails " & _
"WHERE tblProjectDetails.[subtypeid] " & strSubtype & _
strSubtypeCondition & "tblProjectDetails.[status] " & strStatus & _
strSortOrder & ";"
cat.ActiveConnection = CurrentProject.Connection
Set cmd = cat.Views("Query1").Command
cmd.CommandText = strSQL
Set cat.Views("Query1").Command = cmd
Set cat = Nothing
DoCmd.OpenForm "Projects", , "Query1"
I have cleaned up my code, compact and repaired, compiled, got rid of unneeded tables, queries, etc. and no change.
I have read up on all of the possible causes/solutions and can't seem to narrow it down.
Thanks for any help,
Toni
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Dec 27, 2004
I am making a internet-game. It has for every register player quite some variables stored in a database.
On nearly all pages the database is accessed, modified and closed again. Let's say each player has 20-25 variables stored in the database. Would this cause speed problems? Any ideas to solve this?
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Nov 17, 2004
I want to add a system of getting unique numbers into my database based on the month followed by a unique 3 digit code. For example, if it is February and this is the first record then the reference will read 02/001. Any ideas how I would go about doing this.
I've set up a seperate table called Reference numbers as these reference numbers will be used on any number of forms.
Cheers,
Recall.
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Feb 9, 2005
I've set up a DB to monitor employee hours. I have an employee table with a relationship to work done (one record = one days of work), so everyday is a new record in the work table. This is fine to monitor daily work patterns. However I need to calculate weekly work and other calculations (such as sixth and seventh shift payments, 15%payments, 25% payments etc). Is there any way that I can create a query that will give me one record for an employee that gives me start and end time for a Sunday, same for a Monday etc.
In other words I want to put start and end time for a Sunday to Saturday ( 7 records) into 1 record at the end of the week? (for each employee in the DB.
Any ideas?
Recall.
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Oct 4, 2006
I have a database on a server that is accessed by mobile clients using laptops (broadband)
when out of the office. They use'virtual private network service' to do this.
(I did not set this up, I just design and program the front and back ends)
However some report a slow response time when retieving data from the database file.
Would 'Active desktop' be any quicker?
Any suggestions on how they might speed things up, would be most welcome
'Replication' comes to mind but I think their data must remain up to date at all times.
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Jun 5, 2007
Our office runs on a pretty large Access database (v2003). We are on a large hospital network and have about 15 users for our database. It tends to run VERY, VERY slow. Are there other options?
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Sep 23, 2007
Hi All,
A DB is split (FE / BE) with several FE users and the BE sat on a network.
FE Access 2003. (runtime)
The Sub form has record set type set to Snapshot.
Which of the following scenarios will perform fastest?
Scenario 1,
The FE Queries a linked table and displays the results on a sub form (Datasheet Format).
Scenario 2,
The BE table is copied to the FE (new table) and the query is run against the new table and displays the results on a sub form (Datasheet Format)
The reason for this question is to attempt to reduce the network traffic and further improve the speed performance of a split database.
Garry
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Jun 24, 2005
I have a database that is split into a FE / BE with the BE running on a server and users are accessing thru a dial up connection. This is working very slow do to the fact that I have combo boxes that users select data from that are based on different tables and every time you click on a combo box it takes several minutes to open deponding on the number of records. At 1st I thought that maybe converting to SQL would help solve this but the more I read the less I think that will do the trick. Could someone please advise me on the best solution here.
Thank you
Jim
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Jan 20, 2006
Hi,
I am doing a Left Join to try to look up values in a large (about 100,000 records) table. If the value isn't found, I'm using the nz function to supply a value.
This query runs very slowly (takes about 2 minutes). I can understand why... I suppose that for every value it's trying to look up , it has to loop through all 100,000 records before it decides that it's not there.
So, I am just looking for ideas on how to make this run faster.
I do have indexes on all my join fields and criteria fields.
Thanks for any suggestions.
Here's the SQL:
SELECT VM1a.row, VM1a.Column, VM1a.Noun, VM1a.Rev, VM1a.RefDes, VM1a.repcode, VM1a.Cell, VM1a.InspPoint, VM1a.DefectType, CLng(nz([FirstOfTruncatedOpSeq],0)) AS ZOpSeq, Sum(VM1a.DefectQty) AS SumOfDefectQty
FROM VM1a LEFT JOIN BOMOutRefDesOnly ON (VM1a.RefDes = BOMOutRefDesOnly.RefDesOnly) AND (VM1a.BOM1 = BOMOutRefDesOnly.PCAItemNo)
GROUP BY VM1a.row, VM1a.Column, VM1a.Noun, VM1a.Rev, VM1a.RefDes, VM1a.repcode, VM1a.Cell, VM1a.InspPoint, VM1a.DefectType, CLng(nz([FirstOfTruncatedOpSeq],0));
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Apr 23, 2007
I have a query which returns each entrant with the speed figures in a descending order for previous races, I wish my query to return the top 5 speed figures per entrant or if the entrant has less than 5 previous runs it needs to return all available data.
I am not VBA literate, so as simple as possible please, thanks.
Freddy67
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Apr 24, 2007
I have a lot of queries based on queries. These all work as desired, however they can be slower than I'd like.
Given that my company has no intention of changing to another piece of software I am, therefore, limited to whatever speed I can get out of Access.
Are there any general rules or guidelines that a more experienced person could recommend to ensure that all these queries run as quickly as possible?
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Nov 9, 2004
How can I specify the list that appears in a combo box by programming it with VBA.
I have eight unbound text boxes on a form and I want a combobox to generate its drop down based on the values in these boxes.
I think I'd have to create 8 variables and take the values from these text boxes and assign to the variables. The bit I get stuck on is how to make these variables appear in the combo box list.
Please help,
Recall
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Nov 17, 2004
I have a template fax set up in Microsoft word and want to be able to export fields from my database (in form view) to the word document. For example, I have a 'purchase order No' on the access form which I want to send to the Word document. When exported I then want the user to be prompted to save the document as a new name so they do not overwrite the original template fax.
Any ideas guys,
Cheers,
Recall.
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Nov 20, 2004
I do not want the cursor to move to the next control on a form when the user presses the enter key. It is a memo field and I want the cursor to move to the next line as it would in a word document.
Any ideas,
Recall
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Nov 23, 2004
This is probably v. simple but is doin me head in.
I've got a form based on a query containing three figures (currency). I want a total box that will add the 3 up. On the query I've created a field called Total with the following:
Total:sum([Text1]+[Text2]+Text3])
When three figures are in it works fine. If one of the figures is not there it displays #Name. I could get the fields in the table to automatically display 0, but if a user deletes off the 0 I'm stuffed.
Where am I going wrong?
Recall.
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Nov 23, 2004
Could you please post me the VBAunbound.zip file so I can start getting to grips with unbound forms within Access. All the links in the forum seem to take me nowhere.
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Nov 23, 2004
I've been reading a bit on the site from users who are working with DB over the network and speed issues it brings. I've got the same problem over a Citrix network with a split DB. The speed issue comes when loading up a bound form. I've rewritten some of the code so that when a user leaves a form, instead of closing down, it simple gets hidden and things have speeded up a lot. However, the initial load of the screen on DB start up is v.slow.
I'm interested in finding out how to use an unbound form ad then associate it with the data when it has loaded. Can anyone give me any tips or point me in the way of a sample DB.
Cheers,
Recall.
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Nov 19, 2004
I want to bring up an input box for a user to enter a password, but want the characters they key to appear as *. I can do the input box bit, just the * bit I'm unsure of.
Cheers,
Recall.
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