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Erika VS Miku (FutaLove) Erika VS Miku On A Snowy Day (FutaLove) Milky-Cat.Q:
Issue with sql performance
I have a query and its taking a long time to execute.The query is as follows:
SELECT *
FROM (
SELECT *, ROW_NUMBER() OVER (PARTITION BY APP_ID,PLS_ID ORDER BY PLS_SCO DESC) AS SNO
FROM PLS_SCO_DETAILS
WHERE PLS_ID = '10048'
) AS A
WHERE SNO BETWEEN 1 AND 5
App_id, PLS_id are indexed. The table contains approx 150,000 records. Can anyone tell me what I am doing wrong?
A:
You are sorting the order by PLS_SCO DESC which is not a good idea. I would suggest using DESC for all the columns where the order by can be applied.
SELECT *
FROM (
SELECT *, ROW_NUMBER() OVER (PARTITION BY APP_ID,PLS_ID ORDER BY PLS_SCO DESC) AS SNO
FROM PLS_SCO_DETAILS
WHERE PLS_ID = '10048'
) AS A
WHERE SNO BETWEEN 1 AND 5
A:
Assuming that PLS_SCO is a DateTime column, the ORDER BY is the very slow part.
You should consider putting it into a subquery to avoid the ordering. If there are only five rows returned, then a simple index might be all you need. If there are 150,000 rows, then you need more than a single index. (I'm guessing you already have one PLS_ID index, but you'll need an index on PLS_SCO DESC as well.)
SELECT *
FROM (SELECT *, ROW_NUMBER() OVER (PARTITION BY APP_ID,PLS_ID ORDER BY PLS_SCO DESC) AS SNO
FROM PLS_SCO_DETAILS
WHERE PLS_ID = '10048'
) AS A
WHERE SNO BETWEEN 1 AND 5
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