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CREATE TABLE history_tmp (
itemid bigint unsigned DEFAULT '0' NOT NULL,
clock integer DEFAULT '0' NOT NULL,
value double(16,4) DEFAULT '0.0000' NOT NULL
) ENGINE=InnoDB;
CREATE INDEX history_1 on history_tmp (itemid,clock);
insert into history_tmp select * from history;
drop table history;
alter table history_tmp rename history;
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