Found 4382 Articles for MySQL

NoSQL databases, which stand for "not only SQL, " are a popular alternative to traditional relational databases. They are designed to handle large amounts of unstructured or semi-structured data, and are often used for big data and real-time web applications. However, like any technology, NoSQL databases come with their own set of challenges. Challenges of NoSQL Data modeling and schema design One of the biggest challenges with NoSQL databases is data modeling and schema design. Unlike relational databases, which have a well-defined schema and a fixed set of tables, NoSQL databases often do not have a fixed schema. This can ... Read More

Database Security Databases are a critical component of many modern organizations, as they store and manage sensitive information such as financial data, personal information, and confidential business plans. However, as databases have become more prevalent, they have also become a target for malicious actors looking to exploit vulnerabilities in order to gain access to sensitive information. Database security is therefore a crucial concern for organizations of all sizes and in all industries. Challenges of Database Security One of the major challenges of database security is ensuring that only authorized users are able to access the information stored in the database. ... Read More

Introduction A database management system (DBMS) is a software system that is designed to manage and organize data in a structured manner. In order to accomplish this, DBMS uses a specific architecture that dictates how data is stored, retrieved, and updated. Two of the most commonly used architectures in DBMS are centralized and client-server architectures. Centralized Architecture A centralized architecture for DBMS is one in which all data is stored on a single server, and all clients connect to that server in order to access and manipulate the data. This type of architecture is also known as a monolithic architecture. ... Read More

Bitmap indexing in DBMS is a type of indexing technique that is used to improve the performance of database systems. It works by creating a bitmap for each distinct value in a database column, with each bit in the bitmap representing a row in the database table. The bitmap index can then be used to quickly identify which rows in the table match a given search criteria, making it an efficient way to filter and retrieve data from large tables. In this article, we will delve into the concept of bitmap indexing and how it works, the advantages and disadvantages ... Read More

In database management systems, the ability to connect and retrieve data from multiple tables is crucial for effective data organization and manipulation. The JOIN and DIVISION operations are two binary relational operations that allow users to combine or divide data from multiple tables based on specified conditions. In this article, we will explore the JOIN and DIVISION operations in depth, including their syntax, types, and examples of how they can be used in SQL and other programming languages. What is a JOIN operation? A JOIN operation combines rows from two or more tables based on a related column or set ... Read More

LOB, or Large OBject, is a data type in database management systems (DBMS) used to store large amounts of unstructured data, such as text, images, and videos. LOB data types are useful for storing and manipulating data that does not fit neatly into a traditional row-and-column structure, such as documents, graphics, or audio files. In this article, we will explore the basic operations and working of LOB data types in DBMS and SQL. We will also provide examples of how to use LOB data types in SQL for storing and manipulating large amounts of unstructured data. Types of LOB Data ... Read More

Introduction An audit trail, also known as a transaction log, is a record of all changes made to a database in a DBMS (database management system). It is used to track and monitor database activity, identify and troubleshoot issues, and ensure data integrity and security. In this article, we will explore the purpose and benefits of audit trails in DBMS, how they work, and provide real-life and SQL code examples of their implementation and use. What is an audit trail in DBMS? An audit trail is a chronological record of all database transactions, including insertions, updates, and deletions. It captures ... Read More

There are three types of inheritance mapping strategies − Table per class hierarchy Table per concrete class Table per subclassIn this article, we will discuss table per class hierarchy. Table per class hierarchy In this, only a single table is created for inheritance mapping. Disadvantages of this approach is that a lot of null values gets stored in the table. @Inheritance(strategy=InheritanceType.SINGLE_TABLE), @DiscriminatorColumn and @DiscriminatorValue are the annotations used in this strategy. @DiscriminatorColumn is used to create an additional column which is used to identify the hierarchy classes. Consider the following example to understand this − Steps ... Read More

In this article, we will see how we can execute batch insert/update in hibernate. Whenever we execute a sql statement, we do it by making a network call to the database. Now, if we have to insert 10 entries to our database table, then we have to make 10 network calls. Instead we can optimize our network calls by using batching. Batching allows us to execute a group of SQL statements in a single network call. To understand and implement this, let us define our entities − @Entity public class Parent { @Id @GeneratedValue(strategy ... Read More

In this article, we will see how we can connect to MySQL database using an ORM (object relational mapping) framework like hibernate. First of all, we need to add maven dependency for hibernate in our pom.xml file − org.hibernate hibernate-core 5.6.2.Final Now, let us define an entity class that will be mapped to a database table using hibernate. @Entity @Table( name = " Employee") public class Employee { @Id @GeneratedValue(strategy = GenerationType.AUTO) Long id; @Column(name = ... Read More