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Creation of an Index-Only Table 

Index-only tables have been around since Oracle8. If neither the HASH or INDEX ORGANIZED options are used with the CREATE TABLE command, then a table is created as a standard hash table. If the INDEX ORGANIZED option is specified, the table is created as a B-tree-organized table identical to a standard Oracle index created on similar columns. Index-organized tables do not have rowids.      

Index-organized tables have the option of allowing overflow storage of values that exceed optimal index row size, as well as allowing compression to be used to reduce storage requirements. Overflow parameters can include columns and the percent threshold value to begin overflow. An index-organized table must have a primary key. Index-organized tables are best suited for use with queries based on primary key values. Index-organized tables can be partitioned in Oracle8i and in Oracle9i as long as they do not contain LOB or nested table types. The PCTHRESHOLD value specifies the amount of space reserved in an index block for row data. If the row data length exceeds this value, then the row(s) are stored in the area specified by the OVERFLOW clause. If no overflow clause is specified, rows that are too long are rejected. The INCLUDING COLUMN clause allows you to specify at which column to break the record if an overflow occurs.

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