| Sl.# | DBMS | RDBMS |
|---|---|---|
| 1 | Introduced in 1960s. | Introduced in 1970s. |
| 2 | During introduction it followed the navigational modes (Navigational DBMS) for data storage and fetching. | This model uses relationship between tables using primary keys, foreign keys and indexes. |
| 3 | Data fetching is slower for complex and large amount of data. | Comparatively faster because of its relational model. |
| 4 | Used for applications using small amount of data. | Used for complex and large amount of data. |
| 5 | Data Redundancy is common in this model | Keys and indexes are used in the tables to avoid redundancy. |
| 6 | Example systems are dBase, Microsoft Acces. | Example systems are SQL Server,Oracle. |
Unix / Linux Command cat --- for creating and displaying short files chmod --- change permissions cd --- change directory cp --- for copying files date --- display date echo --- echo argument ftp --- connect to a remote machine to download or upload files grep --- search file head --- display first part of file ls --- see what files you have lpr --- standard print command (see also print ) more --- use to read files mkdir --- create directory mv --- for moving and renaming files ncftp --- especially good for downloading files via anonymous ftp . print --- custom print command (see also lpr ) pwd --- find out what directory you are in rm --- remove a file rmdir --- remove directory rsh --- remote shell setenv --- set an environment variable sort --- sort file tail --- display last part of file ta...
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