1. What is RDBMS?
Ans: 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.
2.What are the properties of the Relational tables?
Ans: Relational tables have six properties:
1.Values are atomic.
2.Column values are of the same kind.
3.Each row is unique.
4.The sequence of columns is insignificant.
5.The sequence of rows is insignificant.
6.Each column must have a unique name.
3.What are Schema Objects?
Ans: Schema objects are the logical structures that directly refer to the database's data. Schema objects include tables, views, sequences, synonyms, indexes, clusters, database triggers, procedures, functions packages and database links.
4.Can objects of the same schema reside in different tablespaces?
Ans: Yes.
5.Can a tablespace hold objects from different schemes?
Ans: Yes.
6.What is Oracle table?
Ans: A table is the basic unit of data storage in an Oracle database. The tables of a database hold all of the user accessible data. Table data is stored in rows and columns.
7.What is an Oracle view?
Ans: A view is a virtual table. Every view has a query attached to it. (The query is a SELECT statement that identifies the columns and rows of the table(s) the view uses.)
8.What is Partial Backup ?
Ans: A Partial Backup is any operating system backup short of a full backup, taken while the database is open or shut down.
9.What is Mirrored on-line Redo Log ?
Ans: A mirrored on-line redo log consists of copies of on-line redo log files physically located on separate disks, changes made to one member of the group are made to all members.
10.Can a view based on another view?
Ans: Yes.
>Ans: 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.
2.What are the properties of the Relational tables?
Ans: Relational tables have six properties:
1.Values are atomic.
2.Column values are of the same kind.
3.Each row is unique.
4.The sequence of columns is insignificant.
5.The sequence of rows is insignificant.
6.Each column must have a unique name.
3.What are Schema Objects?
Ans: Schema objects are the logical structures that directly refer to the database's data. Schema objects include tables, views, sequences, synonyms, indexes, clusters, database triggers, procedures, functions packages and database links.
4.Can objects of the same schema reside in different tablespaces?
Ans: Yes.
5.Can a tablespace hold objects from different schemes?
Ans: Yes.
6.What is Oracle table?
Ans: A table is the basic unit of data storage in an Oracle database. The tables of a database hold all of the user accessible data. Table data is stored in rows and columns.
7.What is an Oracle view?
Ans: A view is a virtual table. Every view has a query attached to it. (The query is a SELECT statement that identifies the columns and rows of the table(s) the view uses.)
8.What is Partial Backup ?
Ans: A Partial Backup is any operating system backup short of a full backup, taken while the database is open or shut down.
9.What is Mirrored on-line Redo Log ?
Ans: A mirrored on-line redo log consists of copies of on-line redo log files physically located on separate disks, changes made to one member of the group are made to all members.
10.Can a view based on another view?
Ans: Yes.
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