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SQL and PL/SQL Interview Question:
What is Indexes?
Submitted by: AdministratorIndexes are optional structures associated with tables used to speed query execution and/or guarantee uniqueness. Create an index if there are frequent retrieval of fewer than 10-15% of the rows in a large table and columns are referenced frequently in the WHERE clause. Implied tradeoff is query speed vs. update speed. Oracle automatically update indexes. Concatenated index max. is 16 columns.
Submitted by: Administrator
Submitted by: Administrator
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