mysql - 'Ballparking' Number of DB Records to Save Cpu Cycles -

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i noticed gmail started 'ballpark' number of results searches , wondered if aesthetic change or if saved on cpu cycles.

when performing search in gmail says along lines of

viewing 10 results of (hundreds, thousands, etc)

are there sql techniques this? there performance benefits?

anything point me in direction learn more helpful.

pretty sure google search not using mysql. can ball park table's size in mysql doing 

show table status 'table_name';

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