-- In case of downgrade, it's ok to drop unknown tables -- from a future version, as long as they belong to the -- performance schema engine. set @have_old_pfs= (select count(*) from ...
`reserved2` VARCHAR(500) DEFAULT NULL COMMENT '预留å—段2', `reserved3` VARCHAR(500) DEFAULT NULL COMMENT '预留å—段3', `reserved4` VARCHAR(500) DEFAULT NULL COMMENT '预留å—段4', `reserved5` VARCHAR(500) DEFAULT ...
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