April 1999
Intermediate to advanced
584 pages
23h 17m
English
Content preview from Oracle Database Administration: The Essential RefeBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Index-only tables
In some cases, all the data that would normally be stored in a table can be stored in an index, and the table is not necessary. An index-only table, available starting with Oracle8, keeps the data sorted according to the primary key column. There are some limitations to this type of object:
Since the data is not stored in a table, there are no ROWIDs available.
A primary key must be defined for the table.
No additional indexes can be created; only the primary key may be indexed.
An index-only table is created by using the ORGANIZATION INDEX clause of the CREATE TABLE command.
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