Extracting a data

[bang_dba]

I have to extract some data from a table in Database A to Database B.
The table structure on both the d/b are same. A daily job will extract the data from A to B using a DB link.

What is the best way to ensure that only newly inserted records in the table in A is extracted to the table in B.
Can somebody give me the common logic used.

[jovery]

Do you have a timestamp or sequence column in the table, if so this is probaly the best way to select the data to be copied. Otherwise you could consider using MERGE

HTH

[bang_dba]

Thanx jovery,
Can u pls explain me how this MERGE can be done....?