The document discusses different SQL database standards and implementations including MySQL, SQL Server, Oracle DB, and PostgreSQL. It provides an overview of each database including their key features and limitations. It also compares the databases across features such as licensing, server-side scripts, operating system support, and ACID properties. Finally, it presents statistics on the top deployed databases from surveys in 2004 and 2009.

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Prepared : Snipe Team

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SQL standard,
implementations,
Comparison

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Agenda
•Database Introduction
•Different SQL standard and implementations
- MySql
- SQL Server
- Oracle DB
- PostgreSQL
• Comparison
•Statistics

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Database introduction
•A database is structured collection of data.
•Databases may be stored on a computer and examined using a program
•These programs are called database management systems (DMS)
•Relational database: a database structured to recognize relations between
stored items of information
•An object-relational database (ORD), or object-relational database management
system (ORDBMS), is a database management system (DBMS) similar to a
relational database, but with an object-oriented database model: objects, classes
and inheritance are directly supported in database schemas and in the query
language.

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MySql
Mysql
• Is a Relational Database Management System
• MySQL is written in C and C++
• Its SQL parser is written in yacc
• The first version of MySQL appeared on 23 May 1995
• MySQL is offered under two different editions: the open source MySQL
Community Server and the proprietary Enterprise Server

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MySql
Limitations
•MySQL does not currently comply with the full SQL standard for some of the
implemented functionality
•Up until MySQL 5.7, triggers are limited to one per action / timing
•No triggers can be defined on views
•MySQL database's inbuilt functions like UNIX_TIMESTAMP() will return 0
after 03:14:07 UTC on 19 January 2038

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Mysql Server
• Is a relational database management system developed by Microsoft
•As a database server, it is a software product with the primary function of
storing and retrieving data as requested by other software applications which
may run either on the same computer or on another computer across a network
(including the Internet).
•SQL Server uses as its primary query languages T-SQL and ANSI SQL
•Azure SQL Database is the cloud-based version of Microsoft SQL Server,
presented as a platform as a service offering on Microsoft Azure

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Mysql Server
•
•Data storage is a database, which is a collection of tables with typed columns
•Microsoft SQL Server also allows user-defined composite types (UDTs) to be
defined and used
•SQL Server buffers pages in RAM to minimize disc I/O

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Oracle DB
• Oracle Database (commonly referred to as Oracle RDBMS or simply
as Oracle) is an object-relational database management system produced
and marketed by Oracle Corporation
•An Oracle database system—identified by an alphanumeric system identifier or
SID—comprises at least one instance of the application, along with data storage
•The Oracle DBMS can store and execute stored procedures and functions within
itself
•The Oracle RDBMS stores data logically in the form of tablespaces and
physically in the form of data files

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Oracle DB
• The partitioning feature was introduced in Oracle 8
•This allows the partitioning of tables based on different set of keys.
•Specific partitions can then be easily added or dropped to help manage large
data sets.
•Oracle database management tracks its computer data storage with the help of
information stored in the SYSTEM tablespace
•The SYSTEM tablespace contains the data dictionary—and often (by
default) indexesand clusters

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PostgreSql
• is an object-relational database management system (ORDBMS) with an
emphasis on extensibility and on standards-compliance
• PostgreSQL implements the majority of the SQL:2011 standard
• handles complex SQL queries using many indexing methods that are not available
in other databases
•PostgreSQL is cross-platform and runs on many operating systems including
Linux, FreeBSD, Solaris, and Microsoft Windows
• It is free and open-source software, released under the terms of the
PostgreSQL License, a permissive free-software license

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PostgreSql
• PostgreSQL manages its internal security on a per-role basis
• The sepgsql extension (provided with PostgreSQL as of version 9.1) provides an
additional layer of security by integrating with SELinux
• Current version 9.4 released on 2015-06-12 (JSONB data type, ALTER
SYSTEM statement for changing config values, refresh materialized views
without blocking reads)

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Comparison
Feature MS SQL
Server
Oracle Mysql PostgreSQL
License Commercial
software
Commercial
software
Free/open
source
Free/open
source
Server-side
scripts
Transact-SQL &
.NET lang.
PL/SQL ---- User defined
functions
OS support Only windows All except
BSD
All All
Maintainer/
developed
by
Microsoft Oracle
corporation
Oracle
Corporation
PostgreSQL
Global
Development
Group
Interface GUI, SQL API, GUI,
SQL
GUI, SQL API, GUI,
SQL

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Comparison
Feature MS SQL
Server
Oracle Mysql PostgreSQL
ACID
properties
Supports Supports Supports Supports
Auto-increment
columns
Yes No Yes Yes
(SERIAL
data type)
Automatic
conversion of
code pages
No Yes No No
Sql variant Fast
standard
Fast
standard
Slow
standard
Fast
standard

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Statistics
According to CD Times magazine dated July 1, 2004
Top Deployed Databases poll shows following databases in use:
SQL Server with 78%, Oracle - 55%, MySQL - 33% and PostgreSQL - 8%.

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Statistics
In 2009, in a survey, total votes received are 1,697.
SQL Server – 1,121 – 64%,Oracle – 432 – 25%,
MySQL – 144 – 8% ,Other – 64 – 4%.
Other includes PostgreSQL with 12 votes

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Statistics