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I need to get orders count for a day(field “time” is java timestamp,and table “order” has 1,000,000 records), I using:
select count(*) from `order` where `time`>1307894400000 && `time`<1307980799999
this sql used 540ms
I tried create index use field “time” ,but still need to 390ms
how do I optimize this sql statement?
If it is still not enough then your only choice is partitioning the table. Many db engines allow specifying automatic partitions.