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Process to find the non-concurrent objects
Once we find out non-concurrent (mutually exclusive) objects, we can fold all objects together in one thread of process or control. On the other hand, if objects are concurrent in nature we have to assign them to, various thread of control. For illustration, withdraw and deposit operations related to a bank account can be executed in parallel (concurrently).
What is called an evaluation primitive? A relational algebra operation annotated with instructions on how to evaluate is known as an evaluation primitive.
Define entity integrity and referential integrity. How does SQL allow specification of these? Ans: Entity Integrity Rule- If the attribute A of relation R is a prime attribut
What are partial, alternate,, artificial, compound and natural key? Partial Key: It is a set of attributes that can uniquely recognize weak entities and that are related to s
Strict 2PL :Though, this basic 2PL suffers from the trouble that it can result into loss of isolation / atomic property of transaction as theoretically speaking once a lock is rele
List the data structures implemented by the storage manager. The storage manager executes the following data structure a) Data files b) Data dictionary c) indices
Multi-Key File Organisation In this part, we will introduce two basic file Organisation schemes that permit records to be accessed by more than one key field, therefore, allowi
Explain about database system structure? Storage manager Authorization and integrity manager Transaction manager File manager Buffer manager Storage manager
To delete a particular column in a relation which command is used ? To delete a particular column in a relation ALTER command is used.
The figure below depicts the conceptual diagram of a banking system. (a) Describe one example relevant to the system in figure, for each of the 4 types of enterprise appl
List the set operations of SQL? 1) Union 2) Intersect operation 3) The except operation
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