Enforcing Locks (Magic xpa 4.x)

Explicit locking can be acquired at the same levels as implicit locking. When updating a record, an implicit exclusive lock is acquired at record level.

When initiating a

select * from table where ... for update

statement under Oracle, or a

select * from table (UPDLOCK NOWAIT) where …

statement under MSSQL, an explicit shared lock is acquired at record or page level, and the record cannot be updated until the lock is released.