MySQL is the most used Open Source SQL database management system being used for developing
web-based software applications.
A database is a separate application that stores a collection of data. Each database has one or
more distinct APIs for creating, accessing, managing, searching, and replicating the data it
Other kinds of data stores can be used, such as files on the file system or large hash tables in
memory but data fetching and writing would not be so fast and easy with those type of
So now a days we use relational database management systems (RDBMS) to store and manager huge
volume of data. This is called relational database because all the data is stored into different
tables and relations are established using primary keys or other keys known as foreign keys.
Enables you to implement a database with tables, columns, and indexes.
Guarantees the Referential Integrity between rows of various tables.
Updates the indexes automatically.
Interprets an SQL query and combines information from various tables.
Before we proceed to explain MySQL database system, lets revise few definitions related to
Database: A database is a collection of tables, with related data.
Table: A table is a matrix with data. A table in a database looks like a simple
Column: One column (data element) contains data of one and the same kind, for
example the column postcode.
Row: A row (= tuple, entry or record) is a group of related data, for example the
data of one subscription.
Redundancy: Storing data twice, redundantly to make the system faster.
Primary Key: A primary key is unique. A key value can not occur twice in one
table. With a key you can find at most one row.
Foreign Key: A foreign key is the linking pin between two tables.
Compound Key: A compound key (composite key) is a key that consists of multiple
columns, because one column is not sufficiently unique.
Index: An index in a database resembles an index at the back of a book.
Referential Integrity: Referential Integrity makes sure that a foreign key value
always points to an existing row.
MySQL is a fast, easy-to-use RDBMS used being used for many small and big businesses. MySQL is
developed, marketed, and supported by MySQL AB, which is a Swedish company. MySQL is becoming so
popular because of many good reasons.
MySQL is released under an open-source license. So you have nothing to pay to use it.
MySQL is a very powerful program in its own right. It handles a large subset of the
functionality of the most expensive and powerful database packages.
MySQL uses a standard form of the well-known SQL data language.
MySQL works on many operating systems and with many languages including PHP, PERL, C,
C++, JAVA etc.
MySQL works very quickly and works well even with large data sets.
MySQL is very friendly to PHP, the most appreciated language for web development.
MySQL supports large databases, up to 50 million rows or more in a table. The default
file size limit for a table is 4GB, but you can increase this (if your operating system can
handle it) to a theoretical limit of 8 million terabytes (TB).
MySQL is customizable. The open source GPL license allows programmers to modify the MySQL
software to fit their own specific environments.
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