Online Analytical Processing Server (OLAP) is used to enable users to perform analysis on information retrieved from multiple database systems concurrently. It operates on a multidimensional data model. Users can write query data across multiple dimensions, such as location, time, and categories (e.g., Hyderabad-> 2017 -> Sales data). In OLAP, ... Read More

On-Line Transaction Processing (OLTP) System is a type of computer system that helps manage transaction-related tasks. These systems are made to quickly handle transactions and queries on the internet. For instance, supermarket's POS (point of sale) system is an example of an OLTP system. Almost every industry nowadays uses ... Read More

Retrieval and Update Operations When we work with files, we usually do two types of operations: retrieval and update. Retrieval operations help us find specific records in the file and look at their data. Update operations change the file by adding, removing, or modifying records. Selection Conditions To do either ... Read More

Cassandra is a distributed NoSQL database system. It offers high scalability, availability, and fault-tolerance. It uses a decentralized architecture, where data is distributed across multiple nodes, and provides several operations to manipulate data. In this article, we will discuss operations on tables in Cassandra. Creating Tables The first operation in ... Read More

Oracle Label-Based Security (OLS) is a feature of the Oracle Database that provides fine-grained access control over sensitive data based on security labels. This feature enables organizations to enforce access control policies based on the sensitivity of the data rather than the traditional approach of user roles and privileges. In ... Read More

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 ... Read More

Data Warehouse A data warehouse is like a big library where we keep a lot of information from different places. It analyzes and understands the information easily. So you can make good decisions based on these facts. You have all the required information that you need in one place. We ... Read More

Hive was developed by Facebook. It is used for analytics and MapReduce jobs. It can read, write, and manage large datasets. Hive can replace traditional database operations. Hive uses indexing to make queries more efficient, and it can work with compressed data stored in the Hadoop ecosystem. In this article, ... Read More

Cassandra is developed by the Apache Software Foundation. It is a NoSQL database management system. Cassandra utilizes a wide column store to efficiently handle large volumes of data across multiple commodity servers. It is an open-source platform. It offers high availability without a single point of failure. Cassandra is written ... Read More

The concept of deferred update in database management systems (DBMS) involves postponing the actual updates to the database on disk until a transaction successfully completes its execution and reaches the commit point. During the execution of a transaction, updates are only recorded in the log and in the cache buffers. ... Read More