What is difference between DBMS and RDBMS?
DBMS - Data Base Management System
RDBMS - Relational Data Base Management System or Relational DBMS
A DBMS has to be persistent, that is it should be accessible when the program created the data ceases to exist or even the application that created the data restarted. A DBMS also has to provide some uniform methods independent of a specific application for accessing the information that is stored.
RDBMS adds the additional condition that the system supports a tabular structure for the data, with enforced relationships between the tables. This excludes the databases that don’t support a tabular structure or don’t enforce relationships between tables.
DBMS does not impose any constraints or security with regard to data manipulation it is user or the programmer responsibility to ensure the ACID PROPERTY of the database whereas the RDBMS is more with this regards because RDBMS defines the integrity constraint for the purpose of holding ACID PROPERTY. RDBMS may be or may not be Client Server Database System.
Examples :
DBMS - File System, XML
RDBMS - SQL Server, Oracle
Reference : Pinal Dave (http://www.SQLAuthority.com), Various online resources.
pinaldave
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i need sql rdbms details like, normalization, relationship set, entity set and etc.
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Oracle and SQL Server are not RDBMSs! The defining feature of a relational database is that its data structures are all Relations (thus “relational”). Relations consist of values within tuples.
That is not the model used by SQL-based DBMSs. SQL contains many things that are not relational: duplicate rows, duplicate columns, nulls, tables without keys, etc.
SQL borrows certain ideas and terminology from the relational model but the SQL features are quite different from their relational counterparts. For example SQL queries are not true projections, the SQL constraint called “PRIMARY KEY” is not the same thing as a relational primary key, etc.
HI SIR,
I NEED INFORMATION REGARDING- HOW CAN WECREATE INDEXES ON COLOUMNS?
TYPES OF REPLICATIONS,TYPES OF JOINS.
PLEASE SEND YHOSE TO MY MAIL ID.
[...] Relational Data Base Management Systems (RDBMS) are database management systems that maintain data records and indices in tables. Relationships may be created and maintained across and among the data and tables. In a relational database, relationships between data items are expressed by means of tables. Interdependencies among these tables are expressed by data values rather than by pointers. This allows a high degree of data independence. An RDBMS has the capability to recombine the data items from different files, providing powerful tools for data usage. (Read More Here) [...]
Dear all,
Appreciate if you could provide the SQL command/way to backup a single table in one database.
Regards,
Yogesh Setia