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what is the best practice to migrate user application mdb database to sql server

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Hi

I need to get advice from a sql server expert for my facing situation. Our team developed a user application which using mdb file to save data on client machine.  Our client changed a policy to save data in central database server not in mdb file of client. So We have to migrate all data in mdb 
file to ms sql server. we made a scenario about migrating application's mdb file to server. 
First Step we made a application updater. when end user launch , updater will upload all mdb file from client's machine to our web server. And will request to run some server application we made to insert mdb's data  to sql server. server applciation is a just simple application to insert data 
by passed parameters. parameters will be mdb file path , target sql server table name and etc.  we tested our senario. but we had some problem 
during insert mdb's data to sql server. our server application forks a process.  So processs will be forked as number as client's number which connecting to update server.  when 15 processs of server application is running, update server's cpu usage remains 100%. So I am very nervous 
to running server application which inserts data on sql server.  Mdb file contains 40 tables and total 3000 rows in tables. 
So Is there any best way to load mdb's data file not using our custom server application. we can't use dts package because we should keep opening 
comunication chanel with client's updater application to report data uploading status. 

Regards, 
Park    
       

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