Question

i have a table in an access database

this access database is used on a regular basis, basically from 9-5

someone else has a copy of this exact table. sometimes records are added, sometimes deleted, and sometimes data within the records is updated.

i need to update the access database table with the offsite table every hour or so. what is the best algorithm of updating the data? there are about 5000 records.

would it severely lock up the table for a few seconds every hour?

i would like to publicly apologize for my rude comment to david fenton

Answer 1

My impression is that this question ties together pieces you’ve been exploring with your previous questions:

1. a file “listener” to detect the presence of a new file and do something with it when found
2. list files with some extension in a folder
3. DoCmd.TransferText to pull file data into your database
4. Insert, Update, Delete records in a table based on an imported set of records

Maybe it’s time to give us a more detailed picture of what you’re dealing with.

Tony asked if both sites are on the same WAN (Wide Area Network). You replied they are on Windows. Elsewhere you said you’re using a network. Please tell us about the network.

I’m still unsure whether you need a one-way or two-way data exchange. You’ve talked about importing changes from the remote table into the local master table. Do you need to do the same type of operation at the remote site: import changes made to the table at the master site?

Tell us what needs to happen regarding the issue James raised. Can local and remote users ever edit the same record? If they can, how will you resolve the conflict? Similarly, what should happen if a remote user updates a record and a local user deletes their copy of that record?

Based on what you’ve told us so far, this sounds like a real challenge for Access, made more challenging by the rate of record changes (5,000 per hour). I like the outline Kevin suggested. However your challenge will be more complicated since you also need to account for record deletions at both sites.

It seems like you may have to create something which duplicates Access’ Replication feature. Maybe you should look at the Jet Replication Wiki to see if you can modify your design to take advantage of Replication. I can’t help you there, and unfortunately you appear to have frustrated David Fenton who is a leading authority on Jet Replication.