comparison of DBMS( MySQL And Oracle by sami kaifi

8/7/2019 comparison of DBMS( MySQL And Oracle by sami kaifi

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Submitted To:

SIR ISRAR HANIF

Submitted By:

Sami Ullah

Roll No:

BSIT -08-16

Subject:

Database System

Topic:

A comparison of DBMS( MySQL And Oracle

DEPARTMENT OF INFORMATION TECHNOLOGY

B.Z.UNIVERSITY

Multan



A comparison of MySQL And Oracle

Importance of choosing the right database

High cost for an enterprise systemDatabases can hold the ³keys to the castle´Databases can give companies a competitive advantage

Direct comparison isn¶t fair Oracle and MySQL are built for different marketsOracle is designed for the enterprise customer with a big enough budget and more complexbusiness needsMySQL is a lower cost database that is most commonly used for database driven web sites andnon mission critical applicationsFeatures that look identical in a brochure may be implemented very differently (ex. row level

locking)

Cost Oracle

$36,000 per processor for Enterprise Edition + optional$8,000 for support and software updates

$5,000 per processor for Standard Edition + optional$1,100 for support and software updates

MySQLFree to download

$500 for a commercial license + optional$1,500-$62,000 for different levels of support

Oracle FeaturesOracle Management Server

Central administration, monitoring, and tuning of multiple databases Schedule and share database tasks with other admins

Oracle Change Manager Allows you to create a change plan and see the effects of your changes before

actually implementing them Also shows any changes that cannot be applied

Administrative Alerts Oracle will contact the admin by email or pager when an error condition occurs Can be scheduled to reduce false positives

More Oracle FeaturesCapacity Planning

Tracks usage patterns to help admins plan for upgrades



Feedback on CPU, disk and query performanceQuery Optimizer

Oracle chooses the most efficient way to execute a SQL statement

Analyzes tables and indexes to minimize the cost of the transaction

MySQL FeaturesEasy to get started withMany free GUI management tools like PHPMyAdminSpeed is emphasized over lesser used featuresUses very little overhead

MySQL uses just under 1MB of R AM on my laptop

My Oracle 9i installation uses 128MB while idle

More MySQL Features

Beginning to support advanced features Stored Procedures, Triggers, Views in the next version (5)

Select statements with sub-queries were introduced in the current version (4)

Transactional tablesCascading updates and deletesAvailable through the third-party InnoDB storage engine

Migragtion from MySQL to Oracle

As your company grows Oracle may be a better fitMigration tools are available (Oracle Migration Kit)

Companies may use both Oracle and MySQL

Differences in syntax

Not all databases use the same SQL syntaxExample: Returning the first 5 rows of a query

MySQL Select columns

FROM tablenameORDER BY key ASC

LIMIT

5;

Oracle Select * FROM (

SELECT columnsFROM tablenameORDER BY key ASC

) WHERE ROWNUM <= 5;



Timestamps

MySQLCreate a field of type TIMESTAMP and enter an invalid date. In this case February 29 2003.

mysql> insert into tester values ('2003-02-29 00:05:00');Query OK, 1 row affected (0.07 sec)

Notice that MySQL doesn't complain about the date. Checking to see what MySQL enters you see that it just changed the date to the first day inMarch.mysql> select * from tester;+----------------+| time |+----------------+| 20030301000500 |+----------------+

1 row in set (0.00 sec)

Timestamps

Oracle

This will work,INSER T INTO tablename (columnname)VALUES (TIMESTAMP'2003-02-28 00:05:00')

while this will fail:INSER T INTO tablename (columnname)

VALUES (TIMESTAMP'2003-02-29 00:05:00')

Concatenation

SQL Standard symbol for concat is ||MySQL uses || as the OR operator

Uses concat(string1, string2)

More familiar to programmers

Breaks the standardOracle uses || for concat

Ex. string1 || string2

Which is better?

MySQL

For non mission-critical environments

Great for database enabled websites

Attractive price point



Oracle

Rock solid dependability, reliability, and features

Steep learning curve and expensive

Designed with the enterprise in mind

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comparison of DBMS( MySQL And Oracle by sami kaifi

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