| Hierarchical Databases |
|
|
|
|
|
|
|
|
|
|
|
|
| • | Work at IBM: |
||||||||||
| – | GUAM, part of the
Apollo program (1964) |
||||||||||
| – | IMS system (1968) |
||||||||||
| • | Designed to
exploit disk structure |
||||||||||
| • | Good for 1-m
relationships, bad for m-m |
||||||||||
| • | Query language: |
||||||||||
| – | getNextWithinParent(),
insert(), replace() |
||||||||||