Database

Document Sample
Database Powered By Docstoc
					  Database



Shahriar Pirnia http://www.pirnia.net
(Storage and Retrieval Systems)




                                  (Hardware)
                                      (Software)
                                            (User)
                                               (Data)
                                    (Database)




                (integrated Data)
                             (Redundancy)
                    (Data Structure)




      (Data Inconsistency)
(Propagating Updates)
       (Data Independence)




                              (Hardware)
                                  (Software)
                                        (User)
                                            (Data)
(Storage and Real-time Systems)




      –




                                  (Tapes)
                                            RADIS
(Storage and Retrieval System)




                                               (Manual)
                                          (Automatic)


                                  (Insert)
                                 (Update)
                            (Retrieval)
(Hardware)
    (Software)
          (User)
             (Data)




             (Hardware)
    (Software)




…
                                           (User)




                       (Access Methods)
          (Data Management System)
(Database Management System)
                       (Knowledge Bases)
(batch)
 (Access Methods)


                      Disk



                               (AM)




(Real-time)         (Online)
                                                     (AM)



VSAM : Virtual Storage Access Method
ISAM : Indexed Sequential Access Method
Btrieve and now Pervasive. SQL : www.pervasive.com
(Data Management System) (DMS)
(Databse Management System) (DBMS)




                                                              (Physical Data Independence)




                                (Security and Availability)
- Knowledge bases
- Object oriented databases
- Object relational database
                       (Data)


                ANSI




(Information)
                                               (Database)


           (integrated)
(Formal)                  (DS)                              (Redundancy)
                                 (Centralized Management)


                                             (Integrated Data)
         Application Programs       




(Non database policy)
                        (Database policy)
AP
                             DMS


                        OS
                                   Fs
     U1                                 U1



User interface




                        OS
                                   Fs
    U2                                  U2


                 App.
User interface
                       
       (Redundancy)    
(Data inconsistency)   
                       
                       
                       
                       



                      (Redundancy)


Application   integrated
                                            (Data inconsistency)

                                              S1

update
                (inconsistence)

                                       S1
         DBMS
                    Database                DBMS



                                  S1
                                                   Programming update
                   (Database Policy)




          OS


          D
U1   AP   B    F
          M    S
          S
                   Interconnected
                         files



U2   AP

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:8
posted:8/26/2011
language:English
pages:27