Indexes in Structure Query Language

Question

Illustrates the Indexes in Structure Query Language?

Answer 1

Indexes are optional structures related with tables used to speed query execution or guarantee individuality. Create an index when there are common retrieval of less than 10-15 percent of the rows in a huge table and columns are referenced often in the WHERE clause. Implied tradeoff is question speed vs. update speed. But oracle automatically updates indexes. Whether concatenated index maximum is 16 columns.