“SELECT COUNT(*)” is slow, even with where clause

Question

I\'m trying to figure out how to optimize a very slow query in MySQL (I didn\'t design this):

SELECT COUNT(*) FROM change_event me WHERE change_event_id >         


        

Answer 1

To make the search more efficient, although I recommend adding index. I leave the command for you to try the metrics again

CREATE INDEX ixid_1 ON change_event (change_event_id);

and repeat query

SELECT COUNT(*) FROM change_event me WHERE change_event_id > '1212281603783391';

-JACR