To avoid conflicts with other users, ArcSDE supports a locking mechanism to
prevent data in a layer from being modified. The locking mechanism operates on
either an area or an entire layer, and supports both read locks and write locks.
Except for row locks, a lock remains in effect until it is explicitly released
or the connection is freed. Row locks are persistent and must be explicitly
released. Freeing a connection does not free row locks.
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