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hi everyone welcome back to my channel my name is ankush todayamp;#39;s video will be based on the performance tuning so in the performance there is one activity which we always do we called it as a rebuilding of index ring building of index so basically what we do and why we are doing this uh rebuilding of index okay this is also many times has been asked in the interview also you know like letamp;#39;s say you have one table is there and in this table you have huge amount of data is there and this data is related to letamp;#39;s say country we have a different different countries are available letamp;#39;s say you have data available related to the usa india china and iamp;#39;m in a situation where i need to find out the data related to the india so my query will be like select star from country where country name equals to india so if i fire this command and assume that we donamp;#39;t have any indexes over here what will happen it will go into the full table scan full table