How to monitor the update of database in Java

The situation:
if the database on the server side is updated, i need to dump the changed files to the client side immediately.
my question:
if only a table is changed, how can i know the specific table in the database immediately?
thank you.

if the database on the server side is updated, i need to dump the changed files to the client side immediately.Changed files? Hopefully you are not talking about the database files. If so then you would have to lock the database before do that.
There are only two ways that you can be notified. The database does it or you poll. If you poll you need an indicator of some sort to indicate that an update has occurred like a record count or a field with a timestampt. The record count is risky because it presumes records will never be deleted.
The database side solution is to add a trigger that sends a notification to you. The type of possible notifications depends on the database. A mixed mode solution is possible with this as the trigger can add a update record to a specific table which your app is polling on.
Polling/triggers are expensive operations. They should never be used in situations where multiple clients are notified. Instead snapshots should be used.

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Message was edited by:
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