UTA INSY 3304 - Chapter 10 Study Guide with Complete Solutions
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Course
INSY
Institution
INSY
UTA INSY 3304 - Chapter 10 Study
Guide with Complete Solutions
Transaction - Answer-A logical unit of work that must be entirely completed or aborted
Atomicity - Answer-All operations of a transaction must be completed; if not the transaction is
aborted
Consistency - Answer-Permanence of datab...
Concurrency Control - Answer✔✔-Coordination of the simultaneous transactions execution in a
multiuser database system
• Objective: ensures serializability of transactions in a multiuser database environment
Problems in Concurrency Control - Answer✔✔-Lost update, uncommitted data, inconsistent retrievals
Scheduler - Answer✔✔-Establishes the order in which the operations are executed within concurrent
transactions
- Creates serialization schedule
Locking methods - Answer✔✔-facilitate isolation of data items used in concurrently executing
transactions
Lock - Answer✔✔-guarantees exclusive use of a data item to a current transaction
Pessimistic locking - Answer✔✔-use of locks based on the assumption that conflict between transactions
is likely
Lock manager - Answer✔✔-responsible for assigning and policing the locks used by the transactions
Lock Granularity - Answer✔✔-- indicates level of lock use
- levels: database, table, page, row, or field (attribute)
Binary lock - Answer✔✔-A lock that has only two states: locked (1) and unlocked (0). If a data item is
locked by a transaction, no other transaction can use that data item.
Exclusive lock - Answer✔✔-Access is reserved for the transaction that locked the object
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