MySQL is an interactive system whose purpose is to act as a database manager, using the SQL language to work. Through it you can manage the data, including the introduction, access and processing thereof. MySQL Features
There is an article that could help you to complement the research related to this last point mentioned; Database models in computing.
How does it work?
First, clients must connect to a server using a certain network. Then, through a graphical user interface they make their requests. If the instructions are clear and understandable, the server returns the desired answers. MySQL Features
Basically, the procedure can be set as follows:
- MySQL creates the database where the data will be stored and manipulated.
- Clients make requests through SQL language.
- The server application will respond to these requests, forwarding them to the clients.
Among the main characteristics of MySQL that it can indicate to the server, are:
- Consult specific data.
- Perform operations to manipulate or modify the data, such as: delete, add, change, sort, etc.
- Define the data types, as well as the relationships between them. MySQL Features
- Control access to data, providing security to them.
Mainly, MySQL owes its origin to the need to create a database for web documents with open source, that is, free software. It belongs to the company MySQL AB, located in Sweden.
Its development began in 1994, but it was a year later when the release of its first version, called MySQL 1.0, was made public. From then on, there have been other versions on the market, as well as major license changes.
In 2008 MySQL was acquired by Oracle, allowing it to operate under the dual license modality. Which guaranteed him to continue developing projects in parallel. MySQL Features
It is important to highlight among the characteristics of MySQL are that it is the product of the observations and recommendations of a group of programmers worldwide, who with their contributions have achieved notable improvements in the system.
Qualities MySQL Features
Due to the functionality of MySQL, among its most important qualities are:
- It supports programming in languages like C and C ++.
- Allows you to select the type of software that will manage the data.
- The use for some of its versions is subject to license.
- Requires use of a commercial license when the code is modified and the new program is distributed with the incorporation of the modification.
- It is the basis of how Linux works, but it has versions for Windows.
- It requires user authentication and verification of the tasks performed by the same.
- It is being used by a greater number of home users.
Advantage MySQL Features
Among the main qualities that should be mentioned about MySQL, the following stand out:
- It is freely distributed via the Internet.
- It is open source, that is, any programmer can modify its code.
- Allows you to create any type of application.
- Has high security privileges. MySQL Features
- Capable of handling large volumes of data.
- It allows the realization of consultations, which are answered quickly.
- It has high technical support capacity.
- For its operation, a large amount of resources is not necessary, which translates into low cost.
- Its structure involves layers and modules, which gives it high stability. MySQL Features
- The process of importing and exporting data is quite simple.
Disadvantages MySQL Features
Fortunately, MySQL has more for it than for it. However, it is important to mention them:
- Unlike other apps, it lacks intuition.
- Depending on the use, it requires large memory storage.
- The process of debugging stored processes is not straightforward.
- Its operation depends on the server connection.
Like almost all wide access programs, there are several versions, each of which seeks to adapt to the needs of customers. Each of them can be downloaded directly from the internet. In the case of MySQL, there are the following adaptations:
- Standard: Contains the full potential of MySQL, but does not have full support for transactions. Allows the use of InnoDB databases.
- Max: Includes test tools that allow you to perform advanced database tasks. MySQL Features
- Pro: Refers to the commercial version of the standard MySQL.
- Classic: It has the same benefits as the standard version, but it does not have support for InnoDB databases.
MySQL installation MySQL Features
The download of the program is done by accessing the official page, www.mysql.com, where you can choose between the two ways of installation available through Windows: The first and easiest is to use the installation program, which will automatically locate all the necessary elements in the predestined folders for this, the second option allows downloading the compressed files without installation. After which, they will have to be unzipped onto the computer’s main hard drive. MySQL Features
It is important to mention that, after installing the program, it is necessary to install the MySQL database server. There are several options, depending on the use for which the program will be destined. In any case, each database creates a folder that contains all the files necessary for the proper functioning of the application.
Server connection MySQL Features
To start the connection with the server, the program requests the introduction of a username and password or password. Similarly, if said server is not on the same machine from which we are accessing, we will need to enter the name of the computer or the IP address of the server in question. MySQL Features
Main commands and syntax
Once the application is installed and the databases are stored, we must use the following commands or instructions:
- Show databases (mysql> show databases;): Displays the active databases, as long as we have permission to do so.
- Create database (mysql> create database databasename;): Allows the creation of a new database. After creating it, we will need to use the Use command.
- Use (mysql> use databasename;): Allows the use of a database already created. MySQL Features
- Drop database (mysql> dropdatabase databasename): Used to drop a particular database.
- Show tables (mysql> show tables;): Allows you to view the tables that make up the current database.
- Create table (mysql> create table tablename;): It is used to create a new table. Allows you to set various options on the fields.
- Describe (mysql> describe tablename;): Used when you want to view the complete structure of a table.
- Alter table (mysql> alter table tablename): It makes it possible to modify a table, either the field or the name of the table that you want to change. MySQL Features
- Insert into (mysql> insert into tablename): Used to manually insert data into a table.
- Load data local infile (mysql> load data local infile filename): Allows you to get the data in a table from an external file.
- Create index (mysql> Create index fieldname): Used to create indexes on a list of fields.
- Select (mysql> select fieldname): Makes the query on the database possible.
- Order by (mysql> order by fieldname): Allows you to sort the fields based on one or more columns.
- Group by (mysql> group by fieldname): It is used to group the results of a query, according to one or more fields.
- Delete from (mysql> delete from fieldname): Used to delete records from a table.
- Quit (mysql> quit): It allows closing the connection with the server.
It is important to note that for the operation of almost all the commands described here, it is necessary to include the specifications of the databases or tables mentioned, such as: variables, columns, rows, etc.
Aspects to consider when using commands
In order to efficiently use any of the instructions that are frequently used on the monitor, it is important to consider the following aspects:
- The SQL language is not case-sensitive.
- When typing the commands, they must all end with the symbol “;”
- The command ends its execution when it finds the text mysql> on the command line.
- Arithmetic operations are possible.
- Two commands are accepted on the same line, as long as they both use the “;” symbol correctly.
- When an instruction covers more than one line, it is understood that it continues if instead of using the text mysql>, the symbol “->” is placed on the monitor.
- The correct way to cancel an instruction before the symbol “;”, is by placing the text “\ c”
- The literal text strings accept, interchangeably, the use of single quotes or double quotes.
Type of data MySQL Features
One of the most important factors to consider in the design of databases is the establishment of the type of data that it will contain. These are:
Numeric: They are differentiated by the range of values that they can compose. In turn, they are subdivided into: Tinylnt, Bit, SmallInt, MediumInt, IntegerINT, BigINT, Float, xReal Double, Decimal, Dec, Numeric.
Date: The verification of this type of data by MySQL is quite basic, since the system does not verify if the date entered is correct. Just check that the ranges of values entered for the month and day are valid. These types of date data include: Date, DateTime, TimeStamp, Time, and Year.
String: Also called alphanumeric data. They comprise data of type Char, Varchar, Tinytext, TinyBlob, Blob and Text, MediumBlob and MediumText, LongBlob and LongText, and Enum, Set.
Client programs MySQL Features
In computing, it is said that any computer that has an open source relational database management system (RDBMS) installed becomes a client once it runs. Which means that every time it needs to access the data, it must connect to that server.
Seen in this way, MySQL is one of many software that implements a client-server service model. This is because, as we have mentioned, MySQL is a database administrator program for networks, through which clients can communicate with a server, regardless of their geographical location.
MySQL command line
It is used when a graphical interface is not installed, or when a remote server is accessed through a terminal. This program is generally located on the computer’s hard drive, or failing that, in a folder designated for this purpose at the time of MySQL installation. The user is required to write the statements that he wants to execute.
MySQL Administrator Client MySQL Features
It is a program that offers a graphical interface for administrative activities, such as: configurations, server performance control, user and connection management, database backups, among others.
MySQL Query Browser Client
It is a graphical tool that facilitates the queries and analysis of data stored in the MySQL database. Performs the same command line functions, but reduces task execution time.
It allows the development of web pages with access to databases. It constitutes a fairly complete alternative, thanks to the union of several related and interconnected products.
phpMyAdmin MySQL Features
It is a graphical environment that acts as a web page, with remote access. Allows access to all traditional MySQL functions. It is made up of a set of files written in PHP.
It allows working with new databases by creating schemas, or documenting existing ones. This schema acts as a visual representation of the tables and procedures.
It is an open source graphical interface that allows you to easily create, explore and modify tables. It offers several ways of remote connection to other databases. Its only disadvantage is that it is only compatible with Mac OS X.
It is a universal database manager, as it is compatible with most of the existing operating systems. It is intuitive and is written in Java language.
The main characteristic of this database management system is that it allows simultaneous connection with MySQL and Maria DB. In addition, it is compatible with multiple databases included in the computing cloud. Its data management utilities are powerful due to the intuitive nature of its graphical interface.
Although MySQL is the most widely used data management system, it is necessary to mention other alternative applications, the choice of which by the customer depends mainly on their needs. These are:
It is a database management system derived from MySQL. Its origin is due to the intention of guaranteeing the continuity of the use of the MySQL engine even after it was bought by Oracle. Being a copy, its characteristics, advantages and disadvantages are the same. In fact, it is fully compatible with MySQL.
PostgreSQL MySQL Features
Like MySQL it is open source. It is a multiplatform system capable of carrying out larger projects than MySQL without compromising its complexity. It has a license, which allows the commercialization of the code. If you like, it can be said that it is the database management system of the future.
It differs from previous systems, basically, because it does not require the installation of a separate server, since it integrates with the environment in which you are working. It is of limited use, since only simple operations offered by the web or mobile platform on which it is integrated can be performed.
SQLServer MySQL Features
It is not an open source system. Offers more advanced functionality through Microsoft. It is ideal for running projects based on .NET technology. Allows you to manage information from other data servers.
Like SQLserver, its use requires a commercial license. It is the multiplatform database management system most used by companies. Provides comprehensive and complete support to all tasks related to the administration and management of databases. Due to its multiple utilities, its price is quite high.
It is a non-relational database that does not compete entirely with MySQL because it provides different functions. Also, it does not use SQL as its host language. However, depending on the client’s needs, NoSQL can be a fairly advanced and innovative option when it comes to managing databases.
MySQL and cloud computing
As expected, with the emergence and development of cloud computing, MySQl is compatible for some of these types of services. Today, major applications such as Yahoo, Facebook, Google, Twitter, You Tube, etc., use MySQL for data storage.
Similarly, among the characteristics of MySQL, the platform is present in the various deployment models offered by the cloud. A common form of these models is the one that refers to images in virtual machines, as well as, the virtual administration of databases implemented through the SaaS service.
General recommendations for database administration
When working with databases, it is always important to consider the following recommendations:
- Define responsibilities in terms of database administration, specifying the role of each of the people involved, in terms of: creation of database objects, protocols, service continuity, process scheduling, among others. refers.
- Control the entry of data from various sources, ensuring that they are safe and reliable.
- Guarantee the consistency of the database, through the purification and cleaning of the data that is entered.
- Control the management of automatic tasks, such as: user access and request for tasks to be performed.
- Ensure the protection of the information, also offering the restoration of it quickly.
- Shield the information, so that it is protected from any attempted access or manipulation by people outside of it.
- Use cloud computing as an alternative to store information.