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What is database?
Database is a collection of data in a well-organized structured way so that it would be easy to use, manipulate, retrieve and update them whenever required.
Database is basically a container for data. Because a public library stores books, we could also say that a library is a database of books. But strictly defined, database is computer structures that save, organize, protect, and deliver data.
A storage system that contains database is called a database management system, or DBMS.The typical diagram representation for a database is a cylinder. When you go to a library, you can find thousands of books kept in an arranged way. Database can be compared with the library and data can be considered as books in a library.
DBMS handles and manages data like storing, retrieving and updating. Our unique approach in writing Database assignment assures to assist you on all the topics of this course. We provide 24/7 Database assignment help in number of subjects like Oracle assignment help, MySQL assignment help, SQL assignment help, Homework help in MySQL, MongoDB, postgreSQL and many more.
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Types of Databases
Text database
Desktop database
Relational databases
The simplest form of databases is a text database. When data is organized in a text file in rows and columns, it can be used to store, organize, protect, and retrieve data. Saving a list of names in a file, starting with first name and followed by last name, would be a simple database. Each row of the file represents a record. You can update records by changing specific names, you can remove rows by deleting lines, and you can add new rows by adding new lines.
Desktop database programs are another type of database that's more complex than a text database but intended for a single user. A Microsoft Excel or Microsoft Access are good examples of desktop database programs. These programs allow users to enter data, store it, protect it, and retrieve it when needed. The benefit of desktop database programs over text databases is the speed of changing data, and the ability to store large amounts of data while keeping performance of the system manageable.
Relational databases are the most common database systems. They include databases like SQL Server, Oracle Database, Sybase, Informix, and MySQL. The relational database management systems (RDMS) feature much better performance for managing data over desktop database programs. For example, they allow multiple users (even thousands!) to work with the data at the same time, creating advanced security for access to the data. RDBMS systems store data in columns and rows, which in turn make up tables. A table in RDBMS is like a spreadsheet. A set of tables makes up a schema. A number of schemas create a database. Many databases can be created on a single server.
The most innovative structures for storing data today are NoSQL and object-oriented databases. These do not follow the table/row/column approach of RDBMS. Instead, they build bookshelves of elements and allow access per bookshelf. So, instead of tracking individual words in books, NoSQL and object-oriented databases narrow down the data you are looking for by pointing you to the bookshelf, then a mechanical assistant works with the books to identify the exact word you are looking for. NoSQL specifically attempts to simplify bookshelves by storing data in a denormalized way; this means storing it in large chunks.
Normalization is a database business process to break up data into the smallest possible parts. Instead of storing first and last name in one bucket, or field, normalization requires that you store the first name separately from the last name. This is helpful if you want to sort the data by last name or by first name. RDBMS systems require that data is normalized.
Databases Categorized by Local Design Depending on how databases are designed, they can be divided into operational databases and database warehouses. When databases store everyday data with fast updates, they're transactional or operational. These are most common. For example, inventory databases and product databases are all operational. Such databases require high speed of writing and high speed of reading. This makes them special and very sensitive to performance.
Popular and Common databases
PLSQL
MySQL
Oracle
MongoDB
PostgreSQL
MS-Access
