您壓縮該資料庫的請求現在正在伺服器上執行

What happened

You chose File > Application > Properties, clicked the information tab, and clicked Compact for an application on a server.

What you can do

If you chose this command inadvertently, wait a few minutes until the compaction is completed and try again to open the application. Compaction merely removes unused storage space from an application; nothing about the application will change except its size.