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Counseling Astrology Advice | Tarot Advice | Parenting Dating Advice | Love Advice | Divorce Advice Legal Advice | Debt Advice | Career Advice An index is an optional structure associated with a table to have direct access to rows, which can be created to increase the performance of data retrieval. Index can be created on one or more columns of a table. 22. How are the index updates? Indexes are automatically maintained and used by Oracle. Changes to table data are automatically incorporated into all relevant indexes. 23. Explain clusters? Clusters are groups of one or more tables physically stores together to share common columns and are often used together. 24. Explain cluster key? The related columns of the tables in a cluster are called the cluster key. 25. Explain index cluster? A cluster with an index on the cluster key. 26. Explain 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. 27. When can hash cluster used? Hash clusters are better choice when a table is often queried with equality queries. For such queries the specified cluster key value is hashed. The resulting hash key value points directly to the area on disk that stores the specified rows. 28. Explain database link? A database link is a named object that describes a "path" from one database to another. 29. Explain the types of database links? Private database link, public database link & network database link. 30. Explain private database link? Private database link is created on behalf of a specific user. A private database link can be used only when the owner of the link specifies a global object name in a SQL statement or in the definition of the owner's views or procedures. |
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