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Define the Two Phase Locking Protocol
This is a protocol that is used to make sure serializability of transactions. This protocol needs that every transaction issue lock and unlock requests in two phases:
Growing Phase: A transaction may acquire locks, but may not release any lock.
Shrinking Phase: A transaction may release locks, but may not acquire any new locks. Basically, a transaction is in growing phase. The transaction obtains locks as required. Just one time the transaction releases a lock, it comes in the shrinking phase, and it can issue no more lock requests. Two-phase locking makes sure conflict serializability, but does not make sure freedom from deadlock.
Differentiate between natural join and outer join? Natural join is a binary operator which is written as (R * S) where as R and S are relations. The output of the natural join
Suppose R is a relation with attributes A1, A2,..., An. As a function of n, tell how many superkeys R has, if: 1.1 The only key is A1. 1.2 The only key is A1 and A2. 1.3 The o
Determine object representation As a designer, we must choose properly that when to use primitive types in representing objects and when to combine groups of related objects,
we need example of 2phase locking
System Design: An Object Oriented Approach Any software systems always try to change and evolve as technology and business rules evolve. The development of information systems
Write short notes on relational constraints? Relational Constraints are: 1. NOT NULL 2. Unique 3. Primary key 4. Foreign key 5. Table check
Consider the relations City (city_name, state) Hotel (name, address) City_hotel (hotel_name, city_name, owner) Answer the following queries in relational algebra (i) Find
Express the following queries in SQL: (a) Write the SQL code that will create ALL the four tables given in the appendix. Your answer should not contain the primary key and
what is difference between circular inked lust and grunded linked list
Read the description below and draw an Entity-Relationship diagram for it. You must use the symbols described in the course materials. This database will help the Parents Assocc
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