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CIT 214
What is transaction durability?
Durability ensures that once transaction changes have been made, they cannot be undone.
What does a scheduler do?
A scheduler establishes the order in which the operations within concurrent transactions
are executed.
What does a lock do?
A lock guarantees exclusive use of a data item to a current transaction.
deadlock
It is when two tranactions wait indefinitely for each other to unlock data.
transaction log
It keeps track of all transactions that update the database.
What is a transaction?
A unit of work.
What is a lost update?
A lost update happens when two concurrent transactions are updating the dame data element and
one of the updates is lost or overwritten.