Essay about Brief History of Databases
In the 1960's, the use of main frame computers became widespread in many companies. To access vast amounts of stored information, these companies started to use computer programs like COBOL and FORTRAN. Data accessibility and data sharing soon became an important feature because of the large amount of information required by different departments within certain companies. With this system, each application owns its own data files. The problems thus associated with this type of file processing was uncontrolled redundancy, inconsistent data, inflexibility, poor enforcement of standards, and low programmer maintenance. In 1964, MIS (Management Information Systems) was introduced. This would prove to be …show more content…
Defining file structures is a relatively straightforward method by typing the field names and their length, the main part of designing the structure is about complete. Condor uses six data types:
alphabetic alphanumeric C. numeric C. decimal numeric C. Julian date C. dollar Once the fields have been designed, data entry is as easy as pressing enter and inputting the respective values to the appropriate fields and like the newer databases, Condor too can use the Update, Delete, Insert, and Backspace commands. Accessing data is done by creating an index. The index can be used to perform sorts and arithmetic.
dBaseIII DbaseIII is a relational DBMS which was partially built on dbaseII.
Like Condor 3, dbaseIII is menu-driven and has its menus built in several levels. One of the problems discovered, was that higher level commands were not included in all menu levels. That is, dBaseIII is limited to only basic commands and anything above that is not supported. Many of the basic capabilities are easy to use, but like Condor, dBaseIII has inconsistencies and inefficiency. The keys used to move and select items in specific menus are not always consistent through out. If you mark an item to be selected from a list, once it=s marked it can not be unmarked. The only way to correct this is to start over and enter