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11 Cards in this Set
- Front
- Back
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DATABASE |
A COLLECTION OF RELATED DATA THAT IS STORED IN A CENTRAL LOCATION OR IN MULTIPLE LOCATIONS |
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DATA HIERARCHY |
IS THE STRUCTURE AND ORGANIZATION OF DATA WHICH INVOLVES FIELDS RECORDS AND FILES. |
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DATABASE MANAGEMENT SYSTEM (DBMS) |
IS SOFTWARE FOR CREATING STORING MAINTAINING AND ACCESSING DATABASE FILES, A DBMS MAKES USING DATABASES MORE EFFICIENT |
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SEQUENTIAL ACCESS FILE STRUCTURE |
RECORDS IN THE FILES ARE ORGANIZED AND PROCESSED IN NUMERICAL OR SEQUENTIAL ORDER, TYPICALLY THE ORDER IN WHICH THEY WERE ENTERED |
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RANDOM ACCESS FILE STRUCTURE |
RECORDS CAN BE ACCESSED IN ANY ORDER REGARDLESS OF THEIR PHYSICAL LOCATIONS IN STORAGE MEDIA. THIS METHOD OF ACCESS IS FAST AND VERY EFFECTIVE WHEN A SMALL NUMBER OF RECORDS NEED TO BE PROCESSED DAILY OR WEEKLY. |
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INDEXED SEQUENTIAL ACCESS METHOD (ISAM) |
RECORDS CAN BE ACCESSED SEQUENTIALLY OR RANDOMLY DEPENDING ON THE NUMBER BEING ACCESSED . FOR A SMALL NUMBER RANDOM ACCESS IS USED AND FOR A LARGE NUMBER SEQUENTIAL ACCESS IS USED. |
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PHYSICAL VIEW |
INVOLVES HOW DATA IS STORED ON AND RETRIEVED FROM STORAGE MEDIA, SUCH AS HARD DISKS, MAGNETIC TAPES OR CDs |
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LOGICAL VIEW |
INVOLVES HOW INFORMATION APPEARS TO USERS AND HOW IT CAN BE ORGANIZED AND RETRIEVED |
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DATA MODEL |
DETERMINES HOW DATA IS CREATED REPRESENTED ORGANIZED AND MAINTAINED. IT USUALLY CONTAINS DATA STRUCTURE, OPERATIONS AND INTEGRITY RULES |
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HIERARCHICAL MODEL |
THE RELATIONSHIP BETWEEN RECORDS FORM A TREE LIKE STRUCTURE . RECORDS ARE CALLED NODES AND RELATIONSHIPS BETWEEN RECORDS ARE CALLED BRANCHES. THE NODE IS AT THE TOP IS CALLED ROOT AND EVERY OTHER NODE (CALLED CHILD ) HAS A PARENT . NODES WITH THE SAME PARENT ARE CALLED TWINS OR SIBLINGS |
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NETWORK MODEL |
IS SIMILAR TO THE HIERARCHY MODEL BUT RECORDS ARE ORGANIZED DIFFERENTLY. UNLIKE THE HIERARCHICAL MODEL . EACH RECORD IN THE NETWORK MODEL CAN HAVE MULTIPLE PARENT AND CHILD RECORDS |
