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What is not the work of database optimization?

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What is not the work of database optimization?

(a) cleaning out old tables

(b) creating indexes

(c) optimize datatype

(d) delete database

I have been asked this question in class test.

My question is taken from Web Performance Optimization in chapter HTML Images & Web Page Files of HTML

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Right option is (d) delete database

The explanation is: We store various information in the database. A database is a collection of tables that contain information. Database delay takes a long waiting time, so there are various techniques for database optimization. Database optimization basically optimizes data types, tables, data size.

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