Other forms of DML are those used by IMS / DLI, CODASYL databases, such as IDMS and others.
12.
However, in the final tally, CODASYL was very complex and required significant training and effort to produce useful applications.
13.
Relational databases offered improved development productivity over CODASYL systems, and the traditional objections based on poor performance were slowly diminishing.
14.
Less well covered are some of the things I was involved with earlier in my career, such as Codasyl databases.
15.
In IDMS, as in most other Codasyl implementations, the database key is directly related to the physical address of the record on disk.
16.
Not to be confused with a mathematical set, a Codasyl set represents a one-to-many relationship between records : one owner, many members.
17.
Files could also be accessed via the conventional location-addressing mechanism, permitting CAFS to support an IDMS CODASYL database and also support content addressing of the same records.
18.
ANSI and ISO adopted the Codasyl database specifications under the name Network Database Language ( NDL ), with work taking place within the same working group ( X3H2 ) as SQL standardization.
19.
Beginning in the 1970s, Olle became active in the CODASYL organization as Chairman of its Systems Committee and spearheaded the preparation of two early analytical reports on Generalized Database Management Systems .
20.
COBOL was designed in 1959 by CODASYL and was partly based on previous programming language design work by Grace Hopper, commonly referred to as " the ( grand ) mother of COBOL ".
