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Blocking happens when one connection from an application holds a lock and a second connection requires a conflicting lock type. This forces the second connection to wait, blocked on the first. One connection can block another connection, regardless of whether they emanate from the same application or separate applications on different client computers.

points...

maintainablity

incorect database state

dead lock

incorrect data

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Rollin Wiegand

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Q: What problem can occur when a database is processed by more than one user?
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