upgrade database system

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
Dear all ,
we have here huge database its interface build using ms-access and the back end is ms-sql the issue now is there are many users existing in different places , now any user ask about any report it takes a very long time and sometime fail to get data, i need idea to improve the performance .
there are many ways but i can not select any

Skills required:
Database Administration, Software Architecture, SQL, Virtual Assistant
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