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About Indexes. Indexes are optional structures associated with tables and clusters that allow SQL statements to execute more quickly against a table. Just as the index in this manual helps you locate information faster than if there were no index, an Oracle Database index provides a faster access path to table data.
database terminology data-warehouse bulk-load Indexes are often enhanced for placing rows individually. When you're adding a lot of data at the same time, placing rows individually might be inefficient. For example, having a B-Tree, the perfect method to place just one secret is inadequate method of adding a lot of data for an empty index.