php - Fastest way to find different rows in two mysql tables -


i have 2 identical tables. second 1 "slave" of first one. first table has autoincrement int id column , second has id2 indexed unique int, not autoincremented. id2 analog of id.

i need find fastest way detect new rows in second table (those id2 not exist in first table) , vise versa, new rows in first table (those id not exist in second table). fastest way found 

select sql_no_cache     tab1.id `tab1` left join `tab2`      on tab1.id = tab2.id2     isnull(tab2.id2)

takes out 2.5 seconds on ~200k records. may propose faster result?

select * tab2      not exists (select 'x' tab1          tab1.id= tab2.id)

i think query give little faster result.


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