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How does the two phase protocol ensure serializability in database schedules?
Ans: A transaction is termed to follow the two-phase locking protocol if all locking operations precede the first unlock operation in the transaction. Such type of transaction can be divided into two phases: and expanding or growing (first) phase and a shrinking (second) phase. The two-phase locking protocol makes sure serializability in database schedules. Refer any transaction. The point in the schedule in which the transaction has obtained its final lock (the end of its growing phase) is called the lock point of the transaction. Here Now, transactions can be ordered as per to their lock points - this ordering is, actually, a serializability ordering for the transactions.
What is Oracle Process? Explain any four processes started by Oracle. Oracle Process is as follows: SMON: The System Monitor carries out a crash recovery while a crashed in
Cyber Transit Ltd keeps up-to-date information on the processing and current position of each dispatched item. Dispatched items are the main concern of the Cyber Transit product tr
We are looking to find someone to prepare a database which improves upon the one we are using at present. The present database will be found here: Click on filter options and yo
What subschema expresses ? A subschema expresses the external view. (External schemas are called also called as subschemas)
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Describe identifying relationship? Identifying relationship: It is relationship among strong entity and a weak entity it is represented through a doubly outlined diamond in C
Example :; transfers transfer_amount from x's account to y's account ; Supposes x&y both accounts exist TRANSACTION (x, y, transfer_amount) Start transaction IF X AND Y
random file sharing
What is authorization graph? Passing of authorization from single user to another can be shown by an authorization graph.
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