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What is the difference between a repository and a database?
The Metasafe Repository is a (DMBS) Database Management System. There are many types of DMBS with different core models: Oracles, SQLServer, MySQL are based on the "relational model" which is constructed from tables. IMS the database from IBM is based on a hierachical model. Etc. Metasafe is based on an entity-relationship model, which means that is handles "entities" and "relationships between entities". This is the difference. What do they have in common? A (proper) database can be used by many users in parallel. It guarantees that a set of changes (a transaction) is processed completely or not all to make sure that the database is allways in a consistent state. A DMBS has also an access language (in case of Metasafe erSQL) and an API to access the data in the database. Last update on 04.11.2011 by Patrick Landolt.
What is difference between dbms and rdbms?
DBMS stands for "Database Management Systems" it includes all Databases. RDBMS are a special Type of DMBS. "Relational Database Management Systems". On RDBMS you have Tables. Some Tables have are in relation to other Tables. This is needed to organize complex Data. Systems like MySQL, MS Access or MS SQLServer are RDBMS. Other Types are: ODBMS - Object Database Management System ORDBMS - Object Relational Database Management System HDBMS - Hirarchical Database Management System NDBMS - Network Database Management System
What is the difference between DB and DBMS?
dBm us almost exactly the same as dB. The only difference is that there is a reference of 1 Watt = 0 dB, and 1 mW = 0 dBm. Sorry but that is incorrect. db is a ratio and not an absolute value, by it self it means nothing. you got the dbm part right, 1 mW = 0 dbm and it is an absolute value.
Distinguish between DBMS and OLAP systems?
The issue is, what distinguishes relational database systems and multidimensional data base systems. It is certainly possible to have an OLAP DMBS, and indeed a number of them have been on the market in the past. The defining difference is how the data is stored. An OLAP system has specialized data structures for optimizing performance with multidimensional data. A relational system uses data tables and SQL to store data. An native OLAP system (a.k.a MOLAP) does not store the data in relational tables. ...At least not directly. For example Oracle embeds their MOLAP system into relational tables. That can make it confusion, but for simplicities sake, just consider, a conventional, relational DBMS stores data in tables and uses SQL, an OLAP system uses something else and a different language, depending on the vendor. Examples are store data in variables, use Oracle OLAP DML, store data in Microsoft Analysis Services, use MDX, Store data in Essbase, use MDX, etc. For detailed information on using a native OLAP system see "The Multidimensional Data Modeling Tool Kit" on Amazon.
