Database management systems
Database management systems
Part 4/4: Stuff and things
David.Teller@univ-orleans.fr
http://www.univ-orleans.fr/lifo/Members/David.Teller/
2006-16-02
Database management systems
The program
The program
Client/server
Connexion
Security
Privileges
The program
Client/server
Connexion
Security
Privileges
Database management systems
The program
The story so far
What we have seen so far :
Notions
I
I
I
I
I
I
DBMS
relations
keys
domains
constraints
operations
Applications
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I
I
little bits of Access, little bits of OOBase
CREATE TABLE (and other CREATE)
SELECT
Database management systems
The program
Things break
Sorry
Database management systems
The program
Today
I
connexion
users
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meta-informations
I
security.
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Database management systems
The program
By the way
I hope you succeeded with all the exercises.
Database management systems
The program
By the way
I hope you succeeded with all the exercises.
Any questions ?
Database management systems
The program
By the way
I hope you succeeded with all the exercises.
Any questions ?
Keep in mind that the instructions I give here must be tested. SQL is a
standard but it is hardly implemented by everyone.
Database management systems
Client/server
Connexion
The program
Client/server
Connexion
Security
Privileges
Database management systems
Client/server
Connexion
Client ? Server ?
So far, for technical reasons, you’ve been working with local databases
only.
Database management systems
Client/server
Connexion
Client ? Server ?
So far, for technical reasons, you’ve been working with local databases
only.
In real databases, the server is on a computer and the user is on a
different computer. They interact either through terminals or with a
client-server architecture.
Database management systems
Client/server
Connexion
Terminal
Database management systems
Client/server
Connexion
How-to
That’s basically a command-line, just like MS-DOS.
Database management systems
Client/server
Connexion
How-to
That’s basically a command-line, just like MS-DOS.
This kind of thing works with
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MySQL
PostgreSQL
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Oracle
I
Microsoft SQL Server
...
I
I
Database management systems
Client/server
Connexion
How-to
That’s basically a command-line, just like MS-DOS.
This kind of thing works with
I
MySQL
PostgreSQL
I
Oracle
I
Microsoft SQL Server
...
I
I
As they all have different syntax, here’s a hint: help.
Database management systems
Client/server
Connexion
Connectivity
Q What are Access or OOBase ?
Database management systems
Client/server
Connexion
Connectivity
Q What are Access or OOBase ?
A They are just graphical interfaces, used to connect to database on
servers. Essentially, they’re going to use the terminal but hide it from
you. They happen to contain their own mini-server for testing and
learning purposes.
Database management systems
Client/server
Connexion
Connectivity
Q What are Access or OOBase ?
A They are just graphical interfaces, used to connect to database on
servers. Essentially, they’re going to use the terminal but hide it from
you. They happen to contain their own mini-server for testing and
learning purposes.
In the case of OOBase, it’s a crappy one (HSQLDB).
Database management systems
Client/server
Connexion
Connectivity
Q What are Access or OOBase ?
A They are just graphical interfaces, used to connect to database on
servers. Essentially, they’re going to use the terminal but hide it from
you. They happen to contain their own mini-server for testing and
learning purposes.
In the case of OOBase, it’s a crappy one (HSQLDB).
Q How do they cope with different syntax and semantics ?
Database management systems
Client/server
Connexion
Connectivity
Q What are Access or OOBase ?
A They are just graphical interfaces, used to connect to database on
servers. Essentially, they’re going to use the terminal but hide it from
you. They happen to contain their own mini-server for testing and
learning purposes.
In the case of OOBase, it’s a crappy one (HSQLDB).
Q How do they cope with different syntax and semantics ?
A A module called ODBC (Open DataBase Connectivity) or JDBC (Java
DataBase Connectivity) contains drivers for each DBMS.
Database management systems
Client/server
Connexion
Connecting ?
I would have like to let you connect.
Database management systems
Client/server
Connexion
Connecting ?
I would have like to let you connect.
OOBase seems to work.
Database management systems
Client/server
Connexion
Connecting ?
I would have like to let you connect.
OOBase seems to work.
Access doesn’t. I just couldn’t get Access to work.
Database management systems
Client/server
Connexion
Connecting ?
I would have like to let you connect.
OOBase seems to work.
Access doesn’t. I just couldn’t get Access to work.
Server 193.49.89.10 – that’s my laptop
Database master2
User master_student
Password berruyer
Database management systems
Client/server
Connexion
Go ahead
1. Connect, using whatever you can.
2. Add a field date to Wanted and make it part of the Key.
3. Add some information about Phil DeFer the Outlaw.
4. Add the necessary to the database to specify the kind of hat used by
each character.
Database management systems
Client/server
Connexion
Go ahead
1. Connect, using whatever you can.
2. Add a field date to Wanted and make it part of the Key.
3. Add some information about Phil DeFer the Outlaw.
4. Add the necessary to the database to specify the kind of hat used by
each character.
Any comments ?
Database management systems
Client/server
Connexion
Go ahead
1. Connect, using whatever you can.
2. Add a field date to Wanted and make it part of the Key.
3. Add some information about Phil DeFer the Outlaw.
4. Add the necessary to the database to specify the kind of hat used by
each character.
Any comments ?
You may have had problems of concurrency.
Database management systems
Client/server
Connexion
Go ahead
1. Connect, using whatever you can.
2. Add a field date to Wanted and make it part of the Key.
3. Add some information about Phil DeFer the Outlaw.
4. Add the necessary to the database to specify the kind of hat used by
each character.
Any comments ?
You may have had problems of concurrency.
That’s one of the reasons why we need control.
Database management systems
Security
Privileges
The program
Client/server
Connexion
Security
Privileges
Database management systems
Security
Privileges
Security
Security is all about preventing the wrong user from doing the wrong
things.
Database management systems
Security
Privileges
Security
Security is all about preventing the wrong user from doing the wrong
things.
Any suggestion for a mechanism ?
Database management systems
Security
Privileges
MAC
Unix-style Mandatory Access Control: for a user u to be allowed to
perform an operation o on some entity e, someone must have given u the
right to perform exactly this operation o on exactly that entity e.
Database management systems
Security
Privileges
MAC
Unix-style Mandatory Access Control: for a user u to be allowed to
perform an operation o on some entity e, someone must have given u the
right to perform exactly this operation o on exactly that entity e.
Of course, giving the right to perform an operation is an operation by
itself.
Database management systems
Security
Privileges
Operations
Privilege
Alter
Create
Create view
Create user
Insert
Delete
Drop
File
Grant option
References
Shutdown
Show view
Update
Usage
Context
Tables
Databases,Tables,Indexes
Tables
Server Admin
Tables
Tables
Databases,Tables
File access on server
Databases,Tables,Functions,Procedures
Databases,Tables
Server Admin
Tables
Tables
Server Admin
Comment
To alter the table
To create new databases an
To create new views
To create new users
To insert data into tables
To delete existing rows
To drop databases, tables, a
To read and write files on t
To give to other users those
To have references on table
To shut down the server
To see views with SHOW C
To update existing rows
No privileges - allow connec
Database management systems
Security
Privileges
More operations !
Create routine
Alter routine
Create temporary tables
Execute
Index
Lock tables
Process
Reload
Replication client
Replication slave
Select
Show databases
Super
Functions,Procedures
Functions,Procedures
Databases
Functions,Procedures
Tables
Databases
Server Admin
Server Admin
Server Admin
Server Admin
Tables
Server Admin
Server Admin
To
To
To
To
To
To
To
To
To
To
To
To
To
use CREATE FUNCTION/PRO
alter or drop stored functions/p
use CREATE TEMPORARY T
execute stored routines
create or drop indexes
use LOCK TABLES (together
view the plain text of currently
reload or refresh tables, logs an
ask where the slave or master
read binary log events from the
retrieve rows from table
see all databases with SHOW D
use KILL thread, SET GLOBA
Database management systems
Security
Privileges
Example
GRANT ALL ON TABLE master2.* TO master_student ;
Grants all table-manipulation rights for database master2 to user
master_student.