thanks Ashish for your help.

thanks for the reply. that solution can work for me. do you know if any error code or exception will be thrown(i am getting JDBC fail: null), so far i try to catch that event/exception so i can wait for a few seconds and re-try to pull the data.

when LCDS first starts, everything goes smoothly, however, after a long time of no activity, when user reload the page, the error message is returned, and says the data cannot be pulled, but the second time the user reload the page, everything goes fine again.for me, it seems LCDS drop the database ...