Need Help To Optimize Performance On Linked Tables On A Network
Oct 13, 2004
I have a problem trying to improve performance on a database with linked tables across a network. I found in MS Access Help that you can do the following (see bullet below), but I have no idea how to use the OpenRecordset method. Can anyone give me an idea how to code this, or update the linked table with the information given below.
*You can greatly enhance performance when opening the main database and opening tables and forms by forcing the linked database to remain open. To do this, create an empty table in the linked database, and link the table in the main database. Then use the OpenRecordset method to open the linked table. This prevents the Microsoft Jet database engine from repeatedly opening and closing the linked database and creating and deleting the associated .ldb file.
I'd appreciate your help.
Thanks in advance,
JYMALY
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May 22, 2006
I have a main computer where my Access Application runs but I also want other computers with the application runnign on it but linked to the backend database on the main computer, however when linking to the tables they are only read only.
How do you link to tables accross the network so you can read and writ e to them?
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Oct 12, 2006
Hi
I have a couple of acces databases running on a peer to peer network (database A and B, which are housed on PC1). The database B has a link to a Customer table in database A. This was running fine until another user on the peer to peer network wanted to use database B on their pc (PC2). I had to change the the file location of the linked table to show it's location on the network so PC2 could open it. Unfortunatley this greatly slowed the operation of the database B on both machines.
If anyone has made it this far - Is there any way round this?
Regards
David
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Jan 20, 2006
I have a access application which is split into 2 bits with the backend being on the network. The thing is its very slow performance wise and i want to try and optimise it...
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Mar 15, 2007
I have designed an Access DB with various forms to display data populated by queries. This runs fairly efficiently when on the same system.
As soon as I try to split the DB into a front and back end and place the data part in a network folder location (across a WAN) the performance is incredibly slow.
The strange thing is that when testing the queries out on SQL server (just as a test), they run quickly and the data can't be more than a few kb in size.
As it was explained to me the other day:
"Access is an file oriented database. There is no client-server code, so all data manipulations are done on client side anyway. Access has to load data across network."
This sounds to me like Access would be loading all 20Mb of data across the WAN and processing it on the client end rather than running the query at the back end first and only sending through 10kb of data.
Is this true?
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Oct 29, 2006
My situation is as follow
I have an Access datebase, where main tables are built and saved.
Also, I have 2 Access modules, which access informations in main tables in an Access datebase (I used Linking to table) and process information in query.
Questions: Linking to tables in another datebases will make perfomance of the module worse ? If the answer is Yes, then in which scale ?
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Dec 22, 2012
When I run the analyzer on all object types it recommends to change the data type for field "zip" (zip code) to "long integer to:
"benefit that table and potentially other objects in my database"
The field type is currently set to text, And I have the same setting for the same field in a separate table, yet it does not come up with a recommendation for that table.
Additionally, I don't seem to have the option "long integer" for the field data type???
jeds - using Access 2010
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Feb 2, 2012
I have a database with a number of linked tables that are linked to tables in different databases (not a back-end).for example, I have table1 that is linked to table1 in K:databasedb1.mdb.table2 linked to table2 in S:datadata.mdb.and so on...
However, recently we have moved all our databases to a new location.
K:databasedb1.mdb is now residing in O:masterdatabase
and S:datadata.mdb is now residing in O:masterdata
and so on...
I'm now in charge of relinking all those tables to point to the new location.I would do this in linked table manager one by one but we have 100s of tables linked to multiple different databases in different location.is there a way to create a VBA code that will automatically do this re-linking process?
so,
1. find unlinkable tables
2. search its new location under O:master
3. re-link it to the new location
Database names and tables names have not been changed. Just the location of databases.
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May 14, 2007
I have a query in ms access. (It is used to simulate inventories under (s,q) policies(not really important)).
It is used on a big table(1.000.000 entries), with data on ship dates and quantities of about 70.000 parts. It adds to the 4 columns one extra columns, with the usage in the leadtime prior to the ship date of the specific part number. It works, but it is too slow. I can only run it within 10 minutes if I leave a number of parts out of the table simulatie. Does anyone have an idea how to optimize it, so that I can include all parts?
sql:
SELECT simulatie.product_nr, simulatie.date, simulatie.customer, simulatie.usage, Sum(simulatie_1.usage) AS usagetotal
FROM simulatie AS simulatie_1 INNER JOIN simulatie ON simulatie_1.produkt_nr = simulatie.produkt_nr
WHERE (((simulatie_1.date) Between [simulatie].[date]-[simulatie].[leadtime] And [simulatie].[date]))
GROUP BY simulatie.produkt_nr, simulatie.date, simulatie.customer, simulatie.usage;
Note that the query works only on a single table.
Any help would be appreciated!
ps. version:Ms access 2002
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Nov 28, 2006
Hi,
I'm using access tables to store my data. to retrive data I use jet odbc engine in c++.
I want to insert a large amuont of records (about 20 mega records) to my database in the fasts way i can. if i use sql syntax (insert into table ()....) it's takes for ages (about 500 records per second).
if i'm writing a csv file and then use import (via access) it's much faster but here I have two problems
1.I dont know how to use the access import tool from c++.
2.I dont think I can distributie the access import tool with my product.
so my questions are :
1. Does any know any tool that insert records in an optimize way?
2. How can I use the access import tool in c++?
3. Can i use the jet engine to import csv files?
thank ishay
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Jan 1, 2008
Hello everyone,
I've just finished my access application, but its size is 4 Mb. I expect that it will be much bigger once users begin to add records.
What is the best way in Access to keep the size of the file as small as possible?
Many thanks in advance,
Regards,
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Feb 11, 2008
Currently there is a MS Word application that runs a MS Access query to generate data for the Mail Merge with a document.
Does anyone have a suggestion as to how this process can be optimized? Specifically, looking to reduce the amount of time required to produce letters (best practices).
Thanks.
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Jan 18, 2015
how to optimize a query expression. I have the below query that determines the employees rate, based on which bracket their total income falls into. I'm concerned that I have not writting this expression in the most efficient manner.
SepEmployeeIncomeTaxRate: IIf([SepEmployeeTotalIncome] Between [Sep_Txl_TaxGroup1_Min] And [Sep_Txl_TaxGroup1_Max],[Sep_Txl_TaxGroup1_Rate],IIf([SepEmployeeTotalIncome] Between [Sep_Txl_TaxGroup2_Min] And [Sep_Txl_TaxGroup2_Max],[Sep_Txl_TaxGroup2_Rate],IIf([SepEmployeeTotalIncome] Between [Sep_Txl_TaxGroup3_Min] And [Sep_Txl_TaxGroup3_Max],[Sep_Txl_TaxGroup3_Rate],IIf([SepEmployeeTotalIncome] Between [Sep_Txl_TaxGroup4_Min] And [Sep_Txl_TaxGroup4_Max],[Sep_Txl_TaxGroup4_Rate],IIf([SepEmployeeTotalIncome] Between [Sep_Txl_TaxGroup5_Min] And [Sep_Txl_TaxGroup5_Max],[Sep_Txl_TaxGroup5_Rate],0)))))
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Jan 24, 2015
In my 2002 Employee table, I have a field which is a hyperlink to photos: C:photosemployee1.bmp (This is what I have entered into the Field as the Hyperlink)...However, from other PCs, I connect to this database and photo folder as a different drive letter, say Z, so when I am on the other networked PCs, and I click on the Hyperlink field, the data will not come up?
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Aug 8, 2012
I am having trouble relinking tables in my Front End database to my Back End database. My BE DB is on a network share and when I try using the link table manager to navigate to the correct folder I get an error message upon entering the network share folder that says:
The Microsoft Access database engine cannot open or write to the file "etworkfolder" It is already opened exclusively by another user, or you need permission to view and write its data.
I have permission to the folder and have ensured that this folder is a trusted location path.
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Jul 29, 2015
Is there a way to replicate NETWORKDAYS formula in Excel to Ms Access?
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May 29, 2013
I've been tasked with coming up with a table structure that will allow me to make a form that lists the available static ip's in my various network range blocks (we have multiple off-site locations and use different ip ranges at each site).
I have the vision in my head of the form, you would select the block range from a drop down list, then see all the available addresses in that range. From there you could assign mark one as used and it is no longer listed on the form (I'm thinking a simple yes/no checkbox). What my co-workers would love to see is if there were entering a new PC assignment and put one of those available IP addresses into that forms record (different table too) then the ip would get deleted from the available pool as well.
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Jul 24, 2014
I have developed a Microsoft Access 2010 database for my client and the database is split with Front-end/Back-end, the Back-end and the database is shared on Network, The client operating system and applications for all users are hosted and consistent and the service is delivered over Citrix.
The database some times corrupt the tables record and give a permanent #Delete Error, I have attached one of the database table and the screenshot of the error,
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Jun 19, 2015
I have split database (B/E is in the SharePoint library, F/E has users on a local PCs). Sometimes, when I update/add data (does not matter if it is via form or directly in the table) it looks OK, but when I re-open the database, the data are gone.
Problem is that I cannot catch the moment when data were not saved (sometimes data are saved, sometimes not). I can point out this: if I re-enter the missing data, primary key continues subsequently, it looks like the data have never been entered. I tried to use script
Code:
If Me.Dirty Then Me.Dirty = False
on "On Close" form event, does not work.
B/E is linked by VBA code and it looks OK (no error, Link Manager shows correct path). I suspect interrupted connetion to the SharePoint but I don't know how to check it. I implemented VBA script co keep open connection to the SP but the issue persists.
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Jul 22, 2015
I have linked tables from SQL Server using ODBC connection that their location never changes. I have used certain fields of those tables to create queries and make table queries to derive to the information I needed.
On these tables on SQL Server, there is new data added daily. Every day, midnight, there's new data records added of whatever transactions took place in that working day. how often do I need to refresh linked tables in this case to get the latest data added. I mean, once I am linked, the make table query using those defined fields, would it get the latest data added by default when the query is executed, or I must refresh linked tables using Linked Table Manager and then run make table query.
Also, if I want the access to automatically refresh linked tables, can I use the following code? I have added this code, and executing it through a button, but I don't see anything happen, the database becomes inactive for couple seconds (I guess while it is updating) but I don't know is it updating the tables for sure or not, though I am not receiving any error when executing the code through the button.
Function RefreshLinkedTables()
Dim tdf As TableDef
For Each tdf In CurrentDb.TableDefs
If Len(tdf.Connect) > 0 Then
tdf.RefreshLink
End If
Next td
End Function
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Apr 30, 2015
How to Update ODBC linked tables on ms access?
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Jul 16, 2013
I have linked tables in my db at the moment that rely on user dsn connections to an SQL server. I've been reading about DSNLess connections and want to try convert what i have to have permanent DSNless connections, but the code I've found doesn't appear to be working.
I've removed server specific details where i felt necessary, but when running the code i have it in place.
Code:
Public Sub RefreshODBCLinks()
Dim connString As String
Dim db As DAO.Database
Dim tb As DAO.TableDef
connString = "DRIVER=SQL Server;SERVER=<database ip address>;DATABASE=<
[Code] .....
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Nov 11, 2014
I have a split database.(Access 2010).Three of the linked tables are Appointments, Appointments_OLD, Appointments_NEW.
I want to use vba to rename Appointments as Appointments_OLD (replacing the current one) and to rename Appointments_NEW as Appointments (replacing the current one)
I have used:
'replace Appointments_OLD by Appointments, replace Appointments by Appointments_NEW
DoCmd.Rename "Appointments_OLD", acTable, "Appointments"
DoCmd.CopyObject , "Appointments", acTable, , "Appointments_NEW"
Unfortunately this just made Appointments and Appointments_NEW clones of one another - changes in one automatically occur in the other.
What I actually want to do is to swap the names round in the backend database while maintaining the right links to the frontend.
Is this possible using vba in the frontend?
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Dec 20, 2007
Hello All,
I currently have a bunch of tables that I have linked to a SQL database. For development purposes (easy of use), I'd like to turn all those tables into regular tables rather than linked so if I take the db offsite, all the data is with me. I realize there will be no updates, etc. but that really doesn't matter for my needs in this case.
Is there a script or an easy way to do this? (besides doing a manual import for a LOT of tables)
I've tried searching but I might not be searching for the correct terminology.
Thanks in advance!
Randy
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Sep 19, 2013
looking for a way to export the list of table names, table types & if they are linked (e.g. tbl Sales Linked .dbf or tbl Staff linked to excel) from a database - this has to be done for about 300 databases.
in an individual db, I have a make table query off of the table MSysObjects to get the data. The Database field tells me where the source of the linked table resides & the ForeignName field gives me an idea of the format of the data source (e.g. dbf or excel). I could manually import that query into each db, run it to get the table names, then copy & paste..
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May 3, 2013
I have one database called asset management. It consists of one main table called cyber assets. Most fields in this table are linked to a manually created lookup table inorder to restrict user input. There are also two additional, none lookup, tables used to list a) the IP addresses (there can be more than one) and b) another similar 1 to many type table. Basically this DB is used to manage basic cyber asset data, excluding most items related to configuration management.
So, this above DB serves the purposes of asset management. Now I essentially need a similar DB for Patch Management. What I've done for this is to assess each patch initially (i.e. just by looking at the patch title and determining if we even have any of those device. i.e. this assessment is not based on OS, model number... just a general 'may' or 'may not' be applicable). Here's what this SEPARATE DB looked like:
Since each patch is essentially assessed against itself, or maybe a better way to describe it is against the users memory of what we do and don't have, only a single table and form was needed.
So now we've been thru this process and the DB is filled, all initial assessments are complete. The next step is to take all the ones that are applicable to our company (based on the initial assessment when you answer, yes is applicable) and do assessments based on each device we have.So what I want to do is to link the two DBs on a new table called Patches_by_device, inside the original patching DB... so the relationships would look like this:
But as you can see, the linked table CYBER_ASSETS has some sort of undefined relationship type, which is causing my issues.So the next thing I did was to autocreate a form based on the Patches_by_device table, and here's the result.I need to change the patch_key to the Patch_ID+Patch description+URL, etc, and to change the device key to the the UNID+IP+functional description, etc...so I changed the form record source like this:
Now I should be able to change the control source of the Patch_key and Device_key to more useful information. so I changed: Patch_key control source to Patch_ID and Device_key control source to UNID (which is in the cyber assets table)
As you can see, it worked for the patch_ID but not the UNID which is part of the linked table.Must it be within one DB, because we have a ton of other modules to implement (e.g. config management, vulnerability assessments, audit stuff, and more...) and I'd like all these to be in individual DBs, all liked back to the main cyber_assets/Asset management DB.I've considered just modifying that patch table so that each device has its own column heading in the table, but this will cause issues when new devices are added.
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