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ORACLE Interview Questions and Answers
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688.. What is a Synonym ?
A synonym is an alias for a table, view, sequence or program unit.
689. What is a Sequence ?
A sequence generates a serial list of unique numbers for numerical columns of a database's tables.
690. What is a Segment ?
A segment is a set of extents allocated for a certain logical structure.
691. What is schema?
A schema is collection of database objects of a User.
692. Describe Referential Integrity ?
A rule defined on a column (or set of columns) in one table that allows the insert or update of a row only if the value for the column or set of columns (the dependent value) matches a value in a column of a related table (the referenced value). It also specifies the type of data manipulation allowed on referenced data and the action to be
performed on dependent data as a result of any action on referenced data.
693. What is Hash Cluster ?
A row is stored in a hash cluster based on the result of applying a hash function to the row's cluster key value. All rows with the same hash key value are stores together on disk.
694. What is a Private Synonyms ?
A Private Synonyms can be accessed only by the owner.
695. What is Database Link ?
A database link is a named object that describes a "path" from one database to another.
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