A sequence is a database object created by a user that can be used to generate unique integers. A typical usage of sequences is to generate primary key values which are unique for each row.
It is generated and incremented (or decremented) by an internal Oracle routine. It can be used by multiple users and for multiple tables too. A sequence can be used instead of writing an application code for sequence-generating routine.
What is meant by free extent?
How will you force database to use particular rollback segment?
How can we organize the tablespaces in Oracle database to have maximum performance?
How will you swap objects into a different table space for an existing database?
What is redo log buffer?
What is meant by recursive hints?
How can we plan storage for very large tables?
How will you estimate the space required by a non-clustered tables?
It is possible to use raw devices as data files and what are the advantages over file system files?
What is a Control file?
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