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Database Articles
Page 191 of 547
What is the difference between data and information in DBMS?
Before understanding the difference between data and information, let’s have a look at the definitions of data and information with an example.DataData is the raw material that can be processed for any computing machine.For example − Employee name, Product name, Name of the student, Marks of the student, Mobile number, Image etc.InformationInformation is the data that has been converted into more useful or intelligent form.For example: Report card sheet.The information is needed for the following reasons −To gain knowledge about the surroundings.To keep the system up to date.To know about the rules and regulations of the society.KnowledgeThe human mind purposefully ...
Read MoreDistinguish between flat files and databases (dbms)?
Let’s discuss flat and database definition before understanding the difference between flat files and databases.Flat filesA flat file contains records which have no structured interrelationship. They are typically called as a text file, where all word processing, structure characters and markup have been removed. A flat file represents a table with a single record per line. Generally, it is a type of database that stores data in a plain text format.DatabaseThe related information when placed in an organized form that makes a database or an organized collection of related information is called a database.For example − Dictionary, Telephone directory etc.DifferencesFollowing ...
Read MoreDifference Between Trigger and Procedure
In this post, we will understand the difference between trigger and a procedure.TriggersIt is implicitly invoked when an event such as INSERT, DELETE, and UPDATE occurs in a table of a database.Nesting of triggers can be achieved using a table.A trigger can’t be called or defined inside another trigger.Transactional statements such as ‘COMMIT’, ‘ROLLBACK’, ‘SAVEPOINT’ can’t be used in triggers.They are used to maintain referential integrity.This is done by keeping a record of the activities performed on a table.No values are returned in a trigger.No value can be passed as a parameter to a trigger.Syntax to define a trigger:CREATE TRIGGER ...
Read MoreDifference Between ALTER and UPDATE Command in SQL
In this post, we will understand the difference between the ALTER command and the UPDATE command in SQL.ALTER CommandThis command is a Data Definition Language (DDL).It performs operation at the structural level, not the data level.This command is used to add, delete, and modify the attributes of the tables in a database.This command, by default, initializes the values of all values in the tuple to NULL.It changes the structure of the table.Syntax: Add a column −ALTER TABLE table_name ADD column_name datatype;Drop a ColumnALTER TABLE table_name DROP COLUMN column_name;UPDATE CommandThis command is a Data Manipulation Language (DML).It performs operations on the ...
Read MoreDifference Between Star and Snowflake Schema
In this post, we will understand the difference between star schema and snowflake schema.Star SchemaHierarchies of dimensions are stored in a dimensional table.It contains a fact table that is surrounded by dimension tables.In this schema, a single join creates the relationship between a fact table and any dimension tables.It is a simple database design.It has high levels of data redundancy.The processing of cube is quick.A single dimension table contains the aggregated data.It is a de-normalized data structure.The queries run quickly in comparison to other schema.It uses start join query optimization technique. Hence, the queries perform well.Tables can be connected with ...
Read MoreDifference Between MySQL and PostgreSQL
In this post, we will understand the difference between MySQL and PostgreSQL.MySQLIt is a relational database management system.It is the product developed by Oracle Corporation.It is supported by Windows, Mac OS X, Linux, BSD, UNIX, z/OS, Symbian, AmigaOS.It can’t be extended.In this system, the phpMyAdmin tool gives the GUI.Mysqldump and XtraBackup provide backup in MySQL.It provides temporary table.It doesn’t provide a materialized view.It doesn’t provide Data Domain Object to the system.PostgreSQLIt is an object-relational database management system.It was developed by the Global Development Group.It is supported by Windows, Mac OS X, Linux and BSD but not by UNIX, z/OS, Symbian, ...
Read MoreDifference Between Grant and Revoke
In this post, we will understand the difference between grant and revoke.GrantIt is a DCL command.It grants permissions to users on database objects.It can also be used to assign access rights to users.For every user, the permissions need to be specified.When the access is decentralized, permission granting is easier.Syntax:grant privilege_name on object_name to {user_name | public | role_name}RevokeIt is a DCL command.It removes permissions if they are granted to users on database objects.It takes away/revokes the rights of the users.If access for a user is removed, all specific permissions provided by that user to others will be removed.If decentralized access ...
Read MoreDifference Between SQL and T-SQL
In this post, we will understand the difference between SQL and T-SQL.SQLIt is a non-procedural language.Relational databases use SQL.It stands for structured query language.It uses query to view and manipulate data.DML and DDL operations are used- Data manipulation language, and data definition language.It is considered as an open-source language.It helps in the manipulation of data and data controlling.Transfer of data happens one by one when SQL is used.T-SQLIt is a Microsoft product.It is known as Transact Structure Query language.It gives a high degree of control to the developers/programmers.It works its best, and provides good performance with Microsoft SQL server.It is ...
Read MoreWhat Is the Default MySQL Port Number?
MySQL uses port number 3306 by default.3306 Port Number3306 port number is used by MySQL protocol to connect with the MySQL clients and utilities such as ‘mysqldump’. It is a TCP, i.e Transmission Control Protocol.VulnerabilitiesLet us see if there are any vulnerabilities while using this default port −In general, port 3306 shouldn’t be opened since it could make the server vulnerable to attack. If the user needs to connect to the database remotely, there are many other secure options, instead of opening the port 3306.One of the secure options includes using an SSH tunnel. On the other hand, if it ...
Read MoreHow can I determine the connection method used by a MySQL Client?
To determine the connection method that is used by MySQL connection, the below command can be used −netstat −ln | grep 'mysql'On Unix, MySQL programs treat the host name ‘localhost’ in a special manner. Hence, it behaves differently than what is expected of it.Type of ConnectionTo know the type of connection from within the mysql CLI, the below command can be used −mysql> \sOutput −Connection: 127.0.0.1 via TCP/IP (or) Connection: Localhost via UNIX socketTCP/IP connection to the local serverTo ensure that the client makes a TCP/IP connection to the local server, the --host or -h can be used. This will ...
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