General :: Building Multiuser Apps With Access?
Aug 6, 2014
I've always setup Front Ends and Back Ends so that a copy of the Front End is distributed to each Desktop.
I've now joined a new company (been here 6 months now) and the way things are done here is that one copy of the FE sits on a share and users open it from that location. This file contains no local tables and all data is connected to either Access or Oracle databases using ADO. The FE has built been utilizing User Defined Types to read all data in to memory.
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Feb 2, 2014
I'm creating my first web app with Access 2013 and I'd like to allow users to run a query after supplying a parameter to be used in the query.Simple example might be to display a list of all records that contain a date older than "x" in a particular field - with the user supplying the value for "x" I understand that query parameters don't work with the web browser and that I need to use a macro to request the input of "x" and pass it to the query, but I can't find any examples of this kind or macro action (OpenDialog, I understand from Jeff's book).
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Nov 17, 2004
Has anyone deployed or is anyone using an access database in a shared drive environment over a network? If so, how is the databases performance and what kind of problems/headaches do you encounter in this environment?
Thanks.
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Dec 16, 2005
I not a big time DB person so please be gentle. I am a computer technician at a school district and need some help. We use a program called Aeries made by Eagle Software for out attendance and grading. It uses an interface that runs through Microsoft Access. There are two version of this software. One is the SQL version and the other just uses an Access DB on a server. We have the Access DB version running Access 2003. It was explained and accepted in the beginning that we didn’t really need the SQL version because of our district size which is some where around 1500 students. Our district consists of 6 school sites that are all connected with a fiber optic backbone running at 200mb with a minimum of 100mb to each desktop. We have a DB for each site running on 1 very beefy server in a central location. I’ve run my problem by the software maker and don’t feel like I’m getting much help. The problem I am having is slowness during login. When the first user of the day attempts to login the program is fast, about 10 seconds from “ENTER” to the main menu. As soon as that 1st user clicks one of the menu buttons anyone else who attempts to login to that database after that experiences at least 30 seconds from “ENTER” to the main menu. I’ve watched what files are accessed and when. I see that when the 1st user logs in, the systemxp.mdw file is accessed and a systemxp.ldb file is created. Then when the user clicks a button on the main menu, the sch05xxx.mdb is accessed and a sch05xxx.ldb file is created. The sch05xxx.mdb file is the main database file for any particular site. The “xxx” would be the site number. As soon as that file is accessed or that lock file is created the user will experience the long login times and sometimes as long as 4 minutes. I don’t believe this is a hardware problem. During the same time that users are slow I have made a copy of one of the databases onto the same HDD on the same server and as long as I’m the 1st person to open it, it will fly. The 2nd person is slow just like the rest. I also don’t think it’s a permission issue, at least not in the domain. I’ve run all these test logged in as myself and have Domain Admin rights to everything. I believe this is a “split database” with the tables on the server and the forms, and queries on the users computer. I read an article here, http://www.microsoft.com/office/previous/xp/columns/column05.asp called “Why is Access 2000 slow for more than one user?” Has anyone else had this problem or have a solution? If I’ve missed something and you need more info please let me know.Thank you for your time and I appreciate any responsesJohn
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Jan 3, 2006
Hi!
I have constructed a database in Aceess 2002 that four persons or more are going to work with. The users have there own computers in the same network. And they are going to work in the database at the same time the database is placed on a shared drive in the network. They must have the possibility to work in the same bookingformular.
Is there something that I have to think about so that everything works allright? I mean in the multiuser environment.
I had a lot of problems when rhe same people worked with an Access 97 database, But I hope that Access 2002 is better for multiusers. Is that correct?
Jak
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Feb 8, 2012
Is it possible to have multiuser working on the same Access file?
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Oct 30, 2013
We are trying to cut down the # of spreadsheets we have and took a purchase tracking spreadsheet and turned it into access db (2010).
We have 3 sites, and users across network would be 1-2 at max might be in db at same time either recording a purchase, or updating a record on received items.
Can this cause corruption? Is there a way to set users up so it won't?
I know in older versions of Access there were shares that could be set up.
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Sep 23, 2006
I've been trying to figure this out, but it looks like a no go.
I wanted to give my users the ability to create/modify queries, but NOT create/modify tables.
Does anyone know if this is possible in Access 2002?
Thanks,
Earl
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Dec 4, 2012
My database contains business names and addresses in separate fields (name, address, city, zip code, state, country)
Now I have to build the address block for labels.
If there were just US addresses it would be easy but a business can be located in any country with the problem being
that countries require the block to be build in a specific way (order of city, state, zip code).
In some cases a particular section has to be upper case as well.
Of course I can build it manually in a memo field but the with chance of something easily going wrong I like to automate it.
It does mean the same info will be stored twice which is basically a no no.
I'm thinking of making a separate table with records for all possible layouts and use those as a source for a memo field in the business table. However I can't oversee if that would work alright or not.
Or should there be a way to generate the blocks on the fly?
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Dec 22, 2004
I use code like the following to build a Word doc from data from multiple
linked tables:
Public Sub Build_Word_Doc()
Dim wrdApp As Word.Application
Dim wrdDoc As Word.Document
Set wrdApp = New Word.Application
Set wrdDoc = New Word.Document
wrdDoc.Activate
wrdDoc.Select
....
{code to build and save doc}
End Sub
If the user does NOT have an instance of Word open when the code runs,
everything processes as desired. If, however, they had Word open when
this code executes, they receive an error and there is a "phantom"
WINWORD.EXE left in Task Manager.
Is there a good way to check for the presence of an active Word doc before
running this code, or any other suggestions to avoid the situation I described?
Any help would be appreciated, 'cause my users look at me cross-eyed when
I tell them they have to close all Word docs before using my application.
Thanks!
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Jun 19, 2006
I have a form that runs a timer every 5 minutes. Depending on what I have put in another table it displays a message (or not) to the user with message details. However, if the user has multiple applications running and the Access application is not currently being used by the user (i.e. they may have Word running and have minimised Access) then the msgbox does not appear. So...
When I display the MSGBOX how can I make it override any application running so that the user is always immediatly aware of the message?
Thanks
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Dec 11, 2006
Hi,
Im running a very simple app from a link inside a Form - heres the code
stAppName = "D:invoicesurl2bmp.exe -url http://sandbox/customersinvoice.asp?ID=XXXX"
I need the ID field to be the same ID as them record that is selected
does anyone know what code i would have to put in there to make it change from record to record??
Thanks
Don
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Aug 20, 2007
Hi everybody,
I have recently been doing a conversion for my boss for a access 2000 database (both front and backend) to a MSSQL backend.
I finished the conversion today (as quite a lot of the code / queries ran slow due to access running the queries locally rather than on the server). And tested it on my and my boss's machine with no problems so he gave the go ahead to update everybody to our new mssql 2000 backend with the modified frontend.
This is when the problems started; We had two different sets of forms for accessing one of our databases systems - the log system, one is the original dynaset based form, and the other is a newer set which uses snapshot views and preforms updates via queries. Nobody uses the old dyanset system apart from my boss and one of the administrative team as they have things on that window which they need to see. About 30 minutes into the release of the new database the system frooze up on my bosses computer and nobody could create a new log (the server was timing out). I assumed this had something to do with the old dynaset's creating locks on the table.
I offlined the database and kicked everybody out of the front end, turned it on again and tied again, this time banning everybody from the dynaset system. Within 10 minutes another computer frooze up, again with a timeout on the insert query. I discovered that after you had added a new log to the database it would timeout on all subquent additions (something it hadn't done during testing) . Further investigatiion showed it was the snapshot list window causing the error, so coded the add log window to close the list before preforming the insert query and then reopen it afterwards. This allowed my machine to make multible additions without flaw. So I released a new client to everybody. 15 minutes later it was timing out again, but this time there you could not even make one new record.
I checked for locks on the table though the server management table and couldn't find any for the Log table. I have restarted the SQL server box and with no avil. So I reverted our backend to the access mdb file and told people to use the old client.
I am at a complete lose to why this is happening, if anybody has had any expericences like this or knows the cause please tell me.
Some information on the database in question.
It was made as an access 2 database all intergrated into one file, then it was seperated into two files (frontend and backend). Upgraded to Access 97, then to 2000 before this final update to MSSQL 2000.
The log system has two main tables. The first is the log title / info table which links (one to many) to a log entry table. This problem only occurs on the main log table and does not appear to be reoccurring anywhere else within the database. The main log table has just under 18,000 rows in it.
Thank you in advance for any help,
Dom
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Jun 19, 2006
I have a form that runs a timer every 5 minutes. Depending on what I have put in another table it displays a message (or not) to the user with message details. However, if the user has multiple applications running and the Access application is not currently being used by the user (i.e. they may have Word running and have minimised Access) then the msgbox does not appear. So...
When I display the MSGBOX how can I make it override any application running so that the user is always immediatly aware of the message?
Thanks
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Nov 12, 2007
Hi Guys,
Thanks for all your help on my last post, again have a problem to update the application, Everything works well but then I need toadd an extra table on my app. At first I thought I can add a table on my Back-End but when I open the Front-End it wont update.
Can someone out there help me how to add a table on apps. from the ground up?
Thanks in advence.
Jepoy
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Oct 5, 2005
I am having some major problems so i thought i would ask you guys out there for some help because i am starting to bang my head against a brick wall.
I have a simple database, well i have 3 but the problem is only occuring on 1. each of these databases sit in a shared folder on the company network. I am trying to allow multiple users access this database but every time a second user tries to open the database they are unable to get access and receive this message
The table 'MSysAccessObjects' is already open exclusively by another user
However i have set the default open mode to be shared.
can anyone help as i really need this database to open in shared mode.
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Mar 16, 2006
Hello to everyone!
This is my first post but I am reading this for a while now and I learned a lot from this site. Now, I have a problem which I cannot solve and I hope that you can help me with some advise.
I designed database for production proces calculation and for warehouse management. I have BE and Fe which are on server and every user has the copy of FE for himself. FE is also on server. Maximum number of concurent users is 3. The problem is that sometimes I get wrong calculations.
For example, when someone click the button for finishing the production process, calculation of production cost goes wrong. But, that is not happening everytime. Let's say one of the 10 calculations goes wrong. I tested aplication localy on my computer and everything is working normaly. I also tested the database in network enviroment (in my house, BE on one and FE on second computer) and everything is also working good.
I have to mention that this factory is rather old and we are constantly experiencing power loss or voltage disruptions. And also I have to mention that network cables are not installed profesionaly. We bought several aditional UPS devices to secure the network from voltage disruptions and now I will test the database again. But, any additional help would be appriciated.
The strange thing is that I never get any kind of error message. Everything seems to work good, but when I look at the numbers I can see that some of the calculations are wrong.
And just one more thing. In my database I have some procedures which are based on several queries which are executed one after another.
Something like this:
docmd.openquery "Query1"
docmd.openquery "Query2"
docmd.openquery "Query3"
etc.
In some places I have up to 7 queries which are executed one after another one (first query deletes the data from table, second one makes the initial calculation, thirdone updates the warehouse data, fourth is calculating the new price, etc.)
Maybe this is the problem?
Thank you in advance,
gile2004
Sorry for my bad english... :)
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Sep 15, 2006
I have split my db and distributed the FE to client pcs while BE is on the network. To demonstrate it i have 2 users , userA who has read/write rights on the shared folder where BE is while userB only has read rights on the shared BE folder. When userA opens the FE he can get in(writing userinfo in the table on the OnLoad event) but when userB gets in the FE opens fine EXCEPT he gets the error that there was an error on the OnLoad event, which i am fine with because userB doesnt have right access to the db yet. But now if the FE is closed by both users and this time when userB logs(read rights only) in before userA(read/write rights) he gets in with no error on the onLoad event but now if userA logs in he is shown the same error on the onLoad event!!!
i am totally lost as to what i have missed, can someome help? this is my code on the onLoad event in the FE:
Private Sub Form_Load()
On Error GoTo formload_errhandler
Me.InsideHeight = 5000
Me.InsideWidth = 10000
DoCmd.Maximize
Me.picBox.Height = Me.InsideHeight
'authenticate the logged user
Dim userName As String
userName = Environ("Username")
'check to see if username is in the SECURITY table
Dim objRS As ADODB.Recordset
Set objRS = New ADODB.Recordset
With objRS
.CursorLocation = adUseClient
.CursorType = adOpenKeyset
.Open "SELECT * FROM USER_SECURITY WHERE userID='" & userName & "'", CurrentProject.Connection
.ActiveConnection = Nothing
End With
If objRS.EOF Then
MsgBox (userName & ", access denied")
userAuthenticated = False
DoCmd.Quit
Else
userAuthenticated = True
End If
'at this point userAuthenticated is true
'log the user in USER_LOG table updating userID,dateEntered fields
Dim objCommand As ADODB.Command
Set objCommand = New ADODB.Command
Dim strSQL As String
strSQL = "INSERT INTO USER_LOG (userID,dateEntered) VALUES" & _
"('" & Environ("Username") & "',#" & Now() & "#)"
'save userEntered so userExit can be updated to the right record
'this will be used to query the right record when the user exits
dateEntered = Now()
Set objCommand.ActiveConnection = CurrentProject.Connection
objCommand.CommandText = strSQL
objCommand.Execute
Set objCommand = Nothing
formload_errhandler:
MsgBox ("Application has encountered an expected error")
Resume Next
End Sub
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Jul 17, 2007
Dear All,
My company have an application that is using Microsoft Access for the database. The Application created by VB.
Because of server hardware failure, I have to reinstall the server (OS Windows XP) dan also the Microsoft Access.
Now my application cannot run in multiuser anymore after reinstall the server.
My applcation still can run in client computer but cannot run simultaneously in several client computer, because if one client computer has access the database in server, the other client computer cannot access the database, raising error inform that the database already open by other user.
what should I do to solve this problem ?
Thanks in advance.
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Mar 17, 2006
When users try to close Access 97 databases (and this happens in several offices) we sometimes get the following three messages e.g.
Couldn't save; currently locked by user 'Admin' on machine 'CSL600'
Followed by
The Save Operation Failed
Followed by
Out of Memory
Any solutions?
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Apr 18, 2005
Hi-
I have a form in a database that is just a look up form (you cannot add or delete records). How can I prevent this (see below or attachment) from happening?
************************************************** *******
'FormName' has been changed since the last time you opened it, either by another user or because another instance of it was opened on your own machine.
Do you want to replace the changes that you or another user made?
*To save your most recent changes and discard the user's changes or your previous changes, click Yes.
*To save this version of the object with another name, click No.
************************************************** *******
What's the best way to handle multiusers and forms? The database is split but sending the front end to all users is not an option. I've tried different settings thru the Record Lock...Locked fields...Allow Edits/Additions/Deletions...and we still get this message. I've tried adding 'DoCmd.RunCommand acCmdSave' to a timer. It doesn't help. I am at a total loss...does anyone have any ideas?
Thanks,
Derek
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Jun 3, 2006
hi,
am trying to create an application for a company that has a small call-center (strength 20). the db is in the central server and each caller sits with frontend on their computer.
the central DB is shared on the network which these 20 PCs are accessing.
The frontend: 1 Form only which is based on a query that displays records.
Form Lock property: Edited Records
Query Property: Edited Records
As the telecaller starts calling the customer looking at the records, they are not able to edit certain records as the respective record is locked by MS-Access when am sure that no other telecaller has opened the particular record.
Any help is appreciated.
Prodigy.
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Feb 18, 2008
I need some code that checks if i already opened the database. I can't use the /EXCL option because 10+ people are also using it.
I had this code when working with Acc97 but i seem to have lost it.:(
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Aug 4, 2005
We recently put together a database for a call center. The file is located on a public drive, and all users seem to be able to access the file (at the same time) and input new information.
On one particular form, I've found an interesting problem: I've placed a button at the bottom of the form, which will go to a new record when clicked. The command to go to a new record is clearly in the OnClick event, however users in the call center have to click twice in order to execute the code. I don't have to.
We're using the same form, in the same file, opened with the same version of Access.
What's wrong with this database?
Thanks for any help you can give me,
Double-Clicking,
Andrew
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Dec 2, 2014
I have a multiuser split db with this code on a listbox:
Code:
Private Sub lstsearch_DblClick(Cancel As Integer)
' The following is the variable definition for the error handler
On Error GoTo lstsearch_DblClick_Error
Dim ErrorForm As String
Dim ErrorControl As String
[Code] ....
The error function sends me an e-mail listing the error, user, form and sub. Ocasionally some users get error 3049 when running this sub. It is generally one user out of about 10 or so and the db keeps working fine for everyone else. I have reviewed the back end several times and I cannot find any obvious corruption signs. I have compacted and repaired it several times with very small changes is size.
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Jan 2, 2006
Hi, I am desparate!! I work for a high school and need a database to record student community service hours over their high school careers. I have been trying to do this on and off since the summer. I promised I would have it done by the end of winter break but........I may have to go back to a spreadsheet if I can't get this right. That has proved to be a royal pain in the past few years.
I have set up tables but getting the relationships right is a problem. I dont know if it is possible but I would like to set it up so that I have a student form with 4 subforms for each school year. Each subform (4 tabs) will have the title of the school year (i.e. 05-06). We don't allow them to get credit if they go over on their hours for a given year. In other words, they can't do all their service hours in say, freshman year. They have to do 10 as freshmen, 20 as sophomores, 30 as juniors and 40 as seniors.
Each year I can refresh from the school db (for new students, etc.) but I can't go in and create a report in that program as we don't have the capability.
I am trying to teach myself but every tutorial I come across doesn't give reasons why you do something so I can figure out how to convert that info to help me. I have been researching this for a long time and looking at sample dbs.
Can anyone help? I am going to try to attach a copy of the mess I have made so far, Hopefully
Thanks in advance.
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