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Indexing in Apache Cassandra is a way to improve the efficiency and performance of queries on non-primary key columns. In Cassandra, data is organized in tables and each table has a primary key, which consists of one or more columns that uniquely identify each row in the table. Queries that use the primary key to retrieve data are very efficient, but queries that use other columns in the WHERE clause can be slower. Cassandra has secondary indexes that enable querying on columns other than the main key columns to solve this problem. A secondary index is built on a table's ... Read More
Open Database Connectivity (ODBC) is a common API (Application Programming Interface) that enables programmes to connect to different database management systems (DBMS) using a standardised interface. Regardless of how a database's native interface is configured, the ODBC interface offers a consistent mechanism for programmes to communicate with it. The connectivity of ODBC, including its design, drivers, and connections, will be examined in more detail in this article. ODBC Architecture Flow Diagram of ODBC Architecture The three primary parts of the ODBC architecture are the application, the ODBC Driver Manager, and the ODBC driver. Each piece of software that needs ... Read More
Cassandra is a NoSQL database that is made to manage massive volumes of data over several nodes and is extremely scalable. Data distribution over numerous nodes in a cluster, which enables high availability and fault tolerance, is one of Cassandra's core characteristics. In this post, we'll go through the syntax and examples for configuring Cassandra clusters. Configuring a Cassandra Cluster Let's first talk about the fundamental structure of a Cassandra cluster before getting into the specifics of constructing one. Many nodes, each of which can either be a seed node or a normal node, make up a Cassandra cluster. The ... Read More
Overview A flip toggle switch is a “on / off” like switch which changes the state of the HTML element from one form to another. By using the jQuery mobile we can create a responsive attractive flip toggle switch. So to create a flip toggle jQuery provides an attribute value as “fieldcontain”, this value is set to the attribute named as data−role. The data−role attribute is set to the fieldcontain in a div container which provides the property to the container as flip toggle switch. To create a basic flip toggle use the data−role value as a slider in the ... Read More
In general, blur is a visual effect of human eye that happens when the viewer cannot be able to see the details of the object clearly. In HTML, we can apply the blur effect to elements on webpage (such as images) using CSS properties. To do so, we use the filter property along with the blur() function. This function applies a Gaussian blur effect to the image element, which makes it softer and less defined. Syntax Following is the syntax of the filter property with blur() function − filter: blur(radius); This function accepts a single parameter (i.e. radius) that ... Read More
In conclusion, creating a Cassandra cluster entails selecting the seed nodes, setting the replication factor, configuring the IP addresses and ports for each cluster node, as well as additional configuration options like the cluster name. The main configuration file for Cassandra clusters is the cassandra.yaml file. Cassandra clusters may offer high availability and fault tolerance for massive volumes of data with the proper configuration. You may effectively configure a Cassandra cluster to suit your unique requirements by adhering to the syntax and examples shown in this article. Syntax UPDATE table_name SET column1 = value1, column2 = value2, ... WHERE condition; ... Read More
View-equivalence is a term used in database management systems to describe the circumstance in which two schedules, when applied to the same database, yield the same result set. This requirement is necessary to guarantee data correctness and consistency in database applications. There are requirements that schedules must meet in order to achieve view equality. These circumstances are − Conflict Serializability − The conflicting operations in a schedule must be performed in the same sequence for it to be conflict serializable. Operations that access the same data item and at least one of which affects the data are said to ... Read More
In the form of a relation, a database is used to mimic the status of some part of the real world outside. Database systems, in general, store just one state, which is the present state of the actual world, and do not keep data regarding prior and past states, except sometimes as audit trails. If the real world's current state changes, the database is edited and updated, and knowledge about the previous state is lost. But, in the majority of real-world applications, it is important to store and retrieve information about previous states. A student database, for example, must have ... Read More
This article will provide a broad review of computer-based controls before moving into the computer-based controls in databases available in a multi-user database system. Let's discuss all of them one by one. A group of security procedures called computer-based controls are used in DBMSs to safeguard the database against illegal access, alteration, or destruction. These safeguards are intended to guarantee that the database can only be accessed by authorized users and that the data is safe from accidental or deliberate destruction. Physical controls and administrative processes are only a couple of the several remedies available to deal with threats to ... Read More
Complex type structures for objects and literals are also crucial in the context of database management systems (DBMS). In this context, difficult types refer to data types that can store multiple values within a single column or attribute. This allows for more efficient and organized storage of complex data, such as arrays or nested objects, in a database. When it comes to databases, complex type structures for objects and literals can be incredibly useful for storing and retrieving data efficiently. In this article, we will explore how complex type structures can be implemented in databases, their advantages, and some of ... Read More