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DBMS Articles
Page 12 of 27
Distributed Consensus in Distributed System
Distributed Consensus Distributed consensus plays a vital role in decentralized systems, ensuring reliability, fault tolerance, and agreement among multiple parties. Distributed consensus occurs when multiple parties try to accept some values, which is difficult as agreeing is not easy. The complexity to achieve consensus increases as an increase in the number of parties agree on an agreement. Various sites are working together to do a common task by communicating with each other via a network and agreeing to some values which come under distributed consensus. Importance of Distributed Consensus in Distributed Systems In a distributed or decentralized multi−agent platform, ...
Read MoreDouble Buffering
Double buffering is essential for improving user experience and performance. This method is extensively used to reduce delays, increase performance, and enable smooth multitasking in database management systems, streaming media applications, and graphics rendering. In order to optimise data transit and processing, double buffering is used which is a programming approach that uses two buffers or temporary storage spaces. It enables the execution of input and output processes simultaneously, thereby minimising delays and enhancing system performance as a whole. Double buffering allows for efficient multitasking and effective resource management by using one buffer for data storage while the other ...
Read MoreDrop Schema in SQL Server
A schema is a logical structure that stores database objects in SQL Server. It offers a method for classifying and organizing database items including tables, views, and processes. There could be instances where you need to delete a schema from your database. The SQL Server DROP SCHEMA command is useful in this situation. We can delete a schema from the database using the DROP SCHEMA statement. For database administrators and developers who wish to effectively control the structure of their databases, the Drop statement is a crucial tool. Syntax DROP SCHEMA [ IF EXISTS ] schema_name; Here, If ...
Read MoreEconomic Factors(Choices of DBMS)
Making the best option for the organisation's Database Management System (DBMS) is crucial since it may have a big influence on the business's operations and financial resources. When choosing a DBMS, a number of variables come into play, including technical concerns, organisational politics, and economic issues. We may make an educated choice that is in line with the financial objectives and needs of the organisation by being aware of these economic considerations. Factors to Consider Software Acquisition Cost The cost of a software purchase is one of the main economic aspects to consider when selecting a DBMS. This refers ...
Read MoreEncapsulation of Operations and Persistence of Objects
Encapsulation of Operations Encapsulation of operations refers to the behavior of objects in object−oriented database systems(ODBS)through the responsibilities that can be carried out. Objects can be created, changed, retrieved, or deleted by the use of encapsulation of operations. Customers simply receive knowledge of the operations like interface or signature and aren't made privy to how those operations are honestly achieved. The implementation includes the specification of any hidden internal information systems in addition to the common sense that determines the operations, while the interface presents the call and parameters of each action. ODBs offer a sure stage of abstraction ...
Read MoreData Fragmentation, Replication, and Allocation Techniques for Distributed Database
Data Fragmentation The process of dividing the database into smaller multiple parts or sub−tables is called fragmentation. The smaller parts or sub−tables are called fragments and are stored at different locations. Data fragmentation should be done in a way that the reconstruction of the original parent database from the fragments is possible. The restoration can be done using UNION or JOIN operations. Database fragmentation is of three types: Horizontal fragmentation, Vertical fragmentation, and Mixed or Hybrid fragmentation. Horizontal Fragmentation It divides a table horizontally into a group of rows to create multiple fragments or subsets of a table. ...
Read MoreObject Identity, and Objects versus Literals
DBMS supports object-oriented data. It ensures direct correspondence between real-world objects and their representations in the database. This correspondence ensures that objects retain their integrity and identity. It enables easy identification and manipulation. Object Data Management System (ODMS) assigns unique identity to each independent object stored in the database. This unique identity is implemented through a system-generated object identifier (OID). This OID serves as distinct value assigned to each object by the system. It is not visible to external users. However it is internally utilized by the system to ensure the unique identification of each object and to establish and ...
Read MoreOther Primary File Organizations
Files of Mixed Records In DBMS, file organizations are designed to handle records of a single type. However, in most real-world applications, multiple types of entities are interconnected in various ways. To represent relationships among records in different files, fields are connected. For example, a STUDENT record may have a connecting field Major_dept, whose value gives the name of the DEPARTMENT in which the student is majoring. The Major_dept field refers to a DEPARTMENT entity, which should be represented by a record of its own in the DEPARTMENT file. Retrieving field values from two related records requires retrieving one of ...
Read MoreCommonly asked DBMS interview questions for intermediate and advance level Database Engineers
1)What are the different types of constraints in a database and how are they used? Rules that limit the values that may be added to a table are known as constraints in databases. A database may have primary key constraints, foreign key constraints, unique constraints, check constraints, and not null constraints, among other sorts of restrictions. Foreign key constraints ensure that the values in a field match those in another table, whereas primary key constraints guarantee that each row in a table is distinct. While check constraints ensure that values in field match specific requirements, unique constraints guarantee that each ...
Read MoreDatabase Security
A crucial component of contemporary business and technology is database security. The danger of a data breach or cyber assault rises as organizations continue to gather, manage, and store enormous volumes of data. A data breach may result in monetary losses, harm to one's reputation, and legal repercussions. Therefore, it's crucial to establish strong database security measures to protect sensitive data and uphold the database's integrity and confidentiality. This post will address some best practices to make sure your database is safe as well as the many facets of database security. Database security types Physical Security − The safeguarding ...
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