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This guide explains what Bluetooth is , how it 's used , and where it fits into the world of wireless . Percent increase and percent decrease are measures of percent change , which is the extent to which a variable gains or loses intensity , magnitude , extent , or value . In this webcast on Oracle SQL tuning secrets , guru Don Burleson discusses a few techniques , including using materialized views , for improving the speed of SQL queries . In this topic section , you 'll find learning tools on performance management , including articles , expert advice , chapter downloads , white papers and other resources to make you an effective call center manager .