You can often improve the performance of a query by adding or, in some cases, removing indexes. To improve the performance of a query, consider using some of the methods that the following sections describe .
In addition, consider using the CREATE INDEX ONLINE and DROP INDEX ONLINE statements to create and drop an index in an online environment, when the database and its associated tables are continuously available. These SQL statements enable you to create and drop indexes without having an access lock placed over the table during the duration of the index builds or drops. For more information, see Creating and Dropping an Index in an Online Environment.
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