What is an OID and how can it be used?
OID (Object Identifier) is an object identifier represented by physical
location information such as the volume number, page number and slot
number. By using such OIDs, CUBRID manages the reference relationships
of objects and searches, saves or deletes them. When an OID is used,
accessibility is improved because the object in the heap file can be
directly accessed without referring to the table.
So it's safe to say that it's a globally unique identifier for rows, and you can use it as a shortcut to certain rows to get or set values. Also see this how-to page and the JDBC API sample:
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