Database Languages are the set of statements, that are used to define and manipulate a database. A Database language has Data Definition Language (DDL), which is used to construct a database & it has Data Manipulation Language (DML), which is used to access a database. DDL implements database schema at the physical, logical and external level. While, the DML provides the … [Read more...] about Database Languages
View of Data in DBMS
View of data in DBMS narrate how the data is visualized at each level of data abstraction? Data abstraction allow developers to keep complex data structures away from the users. The developers achieve this by hiding the complex data structures through levels of abstraction. There is one more feature that should be kept in mind i.e. the data independence. While changing the … [Read more...] about View of Data in DBMS
Entity Set
Entity Set is a collection or a group of 'entities' sharing exactly the 'same set of attributes'. All entities can be distinctly identified in an entity set. This is because all the entities have a different set of value for some set of attributes. We further classify the entity set into two basic categories Strong and Weak entity set. The collection of entity sets and their … [Read more...] about Entity Set
Register Organization
Register organization is the arrangement of the registers in the processor. The processor designers decide the organization of the registers in a processor. Different processors may have different register organization. Depending on the roles played by the registers they can be categorized into two types, user-visible register and control and status register. Before learning … [Read more...] about Register Organization
Cache Coherence
Cache Coherence assures the data consistency among the various memory blocks in the system, i.e. local cache memory of each processor and the common memory shared by the processors. It confirms that each copy of a data block among the caches of the processors has a consistent value. In this section, we will discuss the cache coherence problem and the protocol for resolving … [Read more...] about Cache Coherence