web analytics

Describe different types of database users and their interfaces. DBMS

by

There are about 4 different types of database users differentiated by their way of interaction with the database system. Brief description has been given below, Naive Users: This type of users generally interacts with the system through previously created programs. Such as, a user may use the system to transfer some balance from one account … Read more

What is transaction? What is Transaction Management? DBMS

by

Transaction: A transaction is a collection of operations that performs a single logical function in a database application. Such as, when we want to add BDT 500 to account A and subtract BDT 500 from account B, that will be a transaction.  Transaction Management: Transaction is a unit of both atomicity and consistency. Thus it … Read more

Briefly describe the two-tier and three-tier architecture. DBMS

by

Two-tier Architecture: In the two-tier architecture, the application is partitioned into a component that resides at the client machine and calls the database system functionality at the server machine using query language statements. Application program interface standards like ODBC and JDBC are used for interaction between the client and the server.  Three-tier Architecture: In three-tier … Read more

Describe the components of the query processor. DBMS

by

Query Processor: As query is very much necessary to find out only the data user need from tons of data of the database, query processor is very important to process these query requests. Query processors come with the following components, DDL Interpreter: It interprets the DDL statements and records the definitions in data dictionary.  DML … Read more

Describe the data structures implemented by the storage manager.

by

Data Structures Implemented by the Storage Manager: The storage manager implements several data structures as part of the physical system implementation. Data Files: It stores the database itself. Data Dictionary: It stores metadata about the structures of the database, in particular schema of the database. Indices: It can provide fast access to data items. It … Read more

What is storage manager? Describe the components of storage manager. DBMS

by
What is storage manager? Describe the components of storage manager. DBMS

Storage Manager in a Database Management System in DBMS

The Storage Manager is a crucial component of a Database Management System (DBMS) that handles the storage, retrieval, and management of data on secondary storage devices. It acts as a bridge between the higher-level components of the DBMS, such as the query processor and transaction manager, and the physical storage media, typically disk drives.

At its core, the Storage Manager is responsible for efficiently organizing and managing the persistent storage of data. It provides an interface between the logical representation of data within the DBMS and the physical storage devices where the data resides. This involves translating high-level data operations and requests from the DBMS into low-level disk operations, ensuring that data is stored, retrieved, and managed reliably.

Read more

In how many ways can database constraints be tested/evaluated? Describe briefly. DBMS

by

Database Constraints: Database constraints are like conditions given to the manipulation of values of a field or attribute. Such as, we may limit the values under the payment attribute of a table that its value can never be less than BDT 350. Constraints can be tested as follows, Domain Constraints: Using domain constraints one can … Read more

Describe Data Definition Language (DDL). DBMS

by

Data Definition Language (DDL): The specific language used to express the database schema by a set definitions is called Data Definition Language (DDL). The DDL is also used to specify additional properties of the data. Another special type of DDL, called the Data Storage and Definition Language, is used to specify storage and data access … Read more

What are database languages? Describe DML (DBMS)

by

Database Language: As whatever we want to be manipulated by computer has to be written using specific language, database is not beyond them. To write or create database management system we use database languages. They are of two types; Data Definition Language (DDL) and Data Manipulation Language (DML). DDL is used to design a database … Read more

What is data model? Describe various data models. DBMS

by

Data Model: Data model is the structure of the database, which is a collection of conceptual tools for describing data, data relationships, data semantics and consistency constraints.  The data models can be classified into the following four categories. Relational Model: The relational data model uses a collection of tables to represent both data and the … Read more