Index By Table in Oracle PL SQL Interview Questions And Answers For Experienced & Freshers | Interview Preparation

Index By Table in Oracle PL SQL Interview Questions And Answers For Experienced & Freshers | Interview Preparation


Index by table is unbound table which is used to store number of data items in a single unit. Basically index by table has two parts.

1) Value field
2) Key field

Value field stores actual data where as key field stores indexes, these indexes are integers. 
These integers are either positive or negative, key fields act's like primary key so it will not accept duplicate value.

To improve performance of index by table oracle provide special datatype binary_integer into the key field. 
For operating data in index by table oracle provided exists, first, last, count, delete(index), delete, delete(one index ,another index) these collection methods.

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