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MySQL 8.0.15 INNODB table Dead slow query
Posted by: balasubramanya balu
Date: March 30, 2019 10:05AM

I was trying to query a innodb table where i am trying to fetch the last record entry and row, but the query is taking 15.14 sec to complete.
the table contains 400,000 records.
here is my query

-- loconumber is a indexed column
-- journeyserla is a autonumber primary key int(11)
with LocomotiveLastRun AS(
SELECT locojourney.loconumber , MAX(locojourney.journeyserla) as lastrunid
from locojourney GROUP BY loconumber)

SELECT locojourney.CurrentCombiners , locojourney.JourneySerla ,
locojourney.From_RunPoint , locojourney.NEXT_RunPoint
FROM
LocomotiveLastRun FORCE INDEX(lastrunid) JOIN
locojourney FORCE INDEX(PRIMARY) ON x.lastrunid = locojourney.journeyserla
WHERE locojourney.ishoc = 'n'

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MySQL 8.0.15 INNODB table Dead slow query
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