Comparison of dbms

COMPARISON OF DBMS

CONTENTS

ORACLEMySQL

Apr 12, 2023 2

PRODUCTS FROM MySQL

• License:GPL or Proprietory

Apr 12, 2023 3

Edition Price (1 year)

Community edition Free

Standard edition $2000

Enteprise edition $5000

Cluster CG Edition $10000

PRODUCTS FROM ORACLE

• License:Proprietory

Apr 12, 2023 4

Edition Price

Standard Edition $70

Enterprise edition $950

Express edition Free

ORACLE vs MySQLMax rows and columns• MySQL

Rows = 65534Columns = 3398

• OracleRows = UnlimitedColumns = 1000

Apr 12, 2023 5

ORACLE vs MySQLDedicated web server• Database servers are dedicated computers

that hold the actual databases and run only the DBMS and related software

• MySQL = No• Oracle =Oracle WebDB, for simple Web

applications Oracle Application Server (OAS) for professional,

scalable Web applications Oracle Internet Server (IAS) for specialized

version of Apache http serverApr 12, 2023 6

ORACLE vs MySQLPrivileages• MySQL : Table level , UPDATE,INSERT on

selected columnsOracle: Table level,

UPDATE,INSERT,REFERENCES on columns

Grouping the access:MySQL : NoOracle: Privileages can be grouped into

rowsApr 12, 2023 7

ORACLE vs MySQLPlatform available• Both are available on major platforms

such as Linux,Windows, OS/2Portability• MySQL: Copy MySQL file between

platforms but with same floating point formats.

• Oracle: Portable with import and export utilities

Apr 12, 2023 8

ORACLE vs MySQLAuthorization• MySQL : 3 parameters, User name,

Password, Location• Oracle: 2 parameters , Username, Password.Stored procedures• MySQL: Available only from 5.x versions• Oracle: PL/SQL, JavaRollback and transaction• MySql = YES• Oracle = YESApr 12, 2023 9

ORACLE vs MySQL• Oracle database supports all three types of outer

join and supports left and right outer joins.

• MySQL supports left and right outer joins, but not full outer joins.

• Without the support of full outer joins, MySQL queries requiring this functionality must use a UNION statement to concatenate the result set of query using a left outer join with the same query using a right outer join.

• Coding the same query twice, changing only the outer join from left to right in the two queries, is inefficient and redundant.

Apr 12, 2023 10

ORACLE vs MySQLSequence• Sequence automatically generates unique numbers.• Sequences is to create a primary key value, which

must be unique for each row. The sequence is generated and incremented by an internal Oracle routine.

Auto-increment• Auto-increment allows a unique number to be

generated when a new record is inserted into a table.

• Very often we would like the value of the primary key field to be created automatically every time a new record is inserted.Apr 12, 2023 11

ORACLE vs MySQLXML:• Extensible Markup Language (XML) is a

standard file format used to transfer data between systems.

• Oracle provides native support for XML with a custom XML data type and tools to query the data.

• MySQL does not provide native XML support.

Apr 12, 2023 12

ORACLE vs MySQL

• Both Oracle and MySQL have memory leaks problem.

• Oracle is better with memory leaks and handles multiple threads.

Apr 12, 2023 13

ORACLE vs MySQLElementary Features:• Basic data types• SQL language features• Declarative integrity constraints• Programming abstractions

Apr 12, 2023 14

ORACLE vs MySQLBasic Data Types

Assessment:

Product GradeMySQL GoodOracle Average

Apr 12, 2023 15

ORACLE vs MySQLCharacter, numeric and date/time

data types:• MySQL:Broad subset of SQL'92

types, including all SQL'92 numeric types.MySQL supports the CHAR and VARCHAR type for character type with a length that is less than 65,535 bytes.

• The CHAR type can have a maximum length of 255 bytes.

• int,double,numberic,datetime,date.

Apr 12, 2023 16

ORACLE vs MySQLCharacter, numeric and date/time

data types:• Oracle:Subset of SQL'92 types plus

specific types. Some SQL'92 types are mapped into Oracle types.

• No boolean type nor equivalent.• Oracle supports four character types:

CHAR, NCHAR, NVARCHAR2 and VARCHAR2.CHAR and NCHAR is 2,000 bytes, and for NVARCHAR2 and VARCHAR2 it is 4,000 bytes….number(10,0),float(24), number, date.

Apr 12, 2023 17

ORACLE vs MySQLSQL Language Features

Assessment:Product GradeMySQL AverageOracle Good

Apr 12, 2023 18

ORACLE vs MySQLSQL Language Features

User-defined data types• MySQL: No.• Oracle: User can define new

complex data types.• Subqueries in SQL queryPossibility of

using subqueries (nested queries) anywhere in SQL query.

• MySQL:No. starting from 4.1 release.

• Oracle8:Uncorrelated and correlated subqueries allowed. Queries can be nested up to 255 levels.

Apr 12, 2023 19

ORACLE vs MySQLDeclarative Integrity Constraints• Integrity constraints defined

declaratively in SQL (e.g. in CREATE TABLE statement) and executed by DBMS.

AssessmentProduct GradeMySQL AverageOracle Very good

Apr 12, 2023 20

ORACLE vs MySQLDeclarative Integrity Constraints

Primary key• MySQL :Yes.• Oracle :Yes.Unique key• MySQL :Yes.• Oracle :Yes.

Apr 12, 2023 21

ORACLE vs MySQLDeclarative Integrity Constraints

Foreign key• MySQL :No. FOREIGN KEY clause is

allowed for compatibility only and has no effect on database operation.

• Oracle :Yes. ON DELETE CASCADE supported

Check• MySQL :No. CHECK clause is

allowed for compatibility only and has no effect on database operation.

• Oracle :Yes.

Apr 12, 2023 22

ORACLE vs MySQLProgramming Abstractions

Virtual SQL language structures as views and synonyms.

AssessmentProduct GradeMySQL PoorOracle Very good

Apr 12, 2023 23


Views:A view is a tailored presentation of the

data contained in one or more tables (or other views). A view takes the output of a query and treats it as a table; therefore, a view can be thought of as a "stored query" or a "virtual table". It should be possible to use views in most places where a table can be used.

MySQL :No.But Yes in version 5 and higher

Oracle :Yes.

Apr 12, 2023 24


Updateable views:Updateable view is a view which can

be used in DML (Data Manipulation Language) statements for modification of the data.

MySQL :No.But updateable VIEWs based on single table or other updateable VIEWs available from MySql 5.0.1 release.

Oracle :Yes.

Apr 12, 2023 25


SynonymsA synonym is an alias for any table,

view or other object in database.MySQL :No.Oracle :Yes.

Apr 12, 2023 26

ORACLE vs MySQLDefault Values For Columns:• In MySQL, for a column that does not allow

NULL value and for which no data is provided for the column when data is inserted into the table, MySQL determines a default value for the column.

• This default value is the implicit default value for the column data type.

• However, if the strict mode is enabled, MySQL generates errors, and for transactional tables it rolls back the insert statement.

Apr 12, 2023 27

ORACLE vs MySQLDefault Values For Columns:• In Oracle, when data is inserted into

a table, data must be provided for all columns that do not allow NULL value.

• Oracle does not generate a default value for columns that have the NOT NULL constraint.

Apr 12, 2023 28

ORACLE vs MySQLTriggers:• Triggers are stored procedures that

automatically execute when a database event occurs or a table event occurs.

• Database events that fire triggers include system startup and shutdown, object creation, and user logins and logouts.

• Table events: insertion, update, or deletion of one or more rows.

• For tables, the triggers can fire before or after the operations.

Apr 12, 2023 29

ORACLE vs MySQLTriggers:• Oracle fires triggers for both

database-level and table-level events.

• MySQL does not support stored procedures, it also does not support triggers.

Apr 12, 2023 30

ORACLE vs MySQLTriggers:• Missing trigger capability is a major

shortcoming of MySQL.• Database administrators rely heavily on

database-level triggers to monitor database events.

• Application developers utilize table-level triggers extensively to ensure that data meets the business requirements.

• However, release 5.0 included triggers.Apr 12, 2023 31

ORACLE vs MySQLSecurity:• Database security is a very important

aspect of any database management system to protect access to the database operations and the data.

Apr 12, 2023 32

ORACLE vs MySQLSecurity:• Oracle implements security for both

users and roles.• Roles provide a method of granting

privileges to many users with a single GRANT statement, or revoking privileges from many users with a single REVOKE statement.

Apr 12, 2023 33

ORACLE vs MySQLSecurity:• MySQL uses the user name and host to

lookup the user’s privileges in the system tables.

• The user table stores database-level privileges to the user, and other tables maintain object-level privileges.

• An administrator creates users by issuing GRANT statements, or by inserting values directly into the user table.

Apr 12, 2023 34

ORACLE vs MySQLSecurity:• MySQL does not use roles or groups to

grant and revoke privileges to multiple users in individual statements.

• The absence of database roles is another major drawback of MySQL.

• Without the ability to group users into roles, the database administrator will have do on individual or rely on other methods.

Apr 12, 2023 35

ORACLE vs MySQLReplication:• Replicating data is the process of

copying data, synchronously or asynchronously, from one database into another database.

• Oracle supports two-way replication whereas MySQL supports only one-way replication from the master to the replica by applying transaction log files to the replica database.Apr 12, 2023 36

ORACLE vs MySQLAuditing:• Oracle provides an auditing facility to

track individual users, database statements, and object statements.

• MySQL does not provide auditing capabilities.

Apr 12, 2023 37

ORACLE vs MySQLAdministration:• Oracle provides for both hot and cold

backups, and includes the Recovery Manager (RMAN) utility to facilitate the backup process.

• Since MySQL stores data in operating system files, administrators perform cold backups by simply copying the files.

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CONCLUSION

• Oracle and MySQL perform at similar levels in tests of response times and throughput.

• But Oracle provides database clustering to achieve improved scalability and throughput, and MySQL does not provide clustering.

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Thank you…

Technology

Comparison of dbms