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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.
Relations create the database. They must satisfy various properties, like no duplicate tuples, no ordering of tuples, and atomic attributes, etc. Relations that satisfy these basic
#questiontypes of keys examples..
why data in an RDMS need to be normalised
PHYSICAL DBMS ARCHITECTURE The physical architecture defines the software components used to process and enter data, and how these software components are related and interc
Hello.I have database access assignment which consist of creation Form, Subform, Calculation, Macros
Using Relational Algebra which query finds customers, who have a balance of over 1000 ? Using Relational Algebra Π Customer_name( σ balance >1000(Deposit)) is query to find cu
Consider the following relational schema: Doctor(DName,Reg_no) Patient(Pname, Disease) Assigned_To (Pname,Dname) Give expression in both Tuple calculus and Domain calculus for
Consider the relations EMP(ENO,ENAME,AGE,BASIC_SALARY) WORK_IN(ENO,DNO) DEPT(DNO,DNAME,CITY) Express the following queries in SQL (i) Find names of employees who work in a dep
Explain Candidate key? Candidate Key - A candidate key is a minimal superkey, that can be used to uniquely identify a tuple in the relation.
Illustrate about the advanced object design Advanced object design is a complex task. The objects discovered through analysis serve as a skeleton of design. The operations reco
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