Wrong estimation of Rows in explain
Posted by:
Rathi Rao
Date: July 27, 2016 06:19AM
Hi,
I have the following query,
select ai.activityid,ai.farmercropid,fca.ActivityID,fca.farmercropid
from activityinformation ai
inner join FarmerCropActivity fca
on ai.farmercropid = fca.farmercropid
and fca.activityid = ai.activityid
select count(*) from FarmerCropActivity; -- 2806792
select count(*) from activityinformation; -- 3269567
Indexes are
create index idx_ai_activityid on activityinformation(activityid)
create index idx_ai_farmercropid on activityinformation(farmercropid)
create index idx_fca_activityid on FarmerCropActivity(activityid)
create index idx_fca_farmercropid on FarmerCropActivity(farmercropid)
The activityinformation table is partitioned on a column called isactive. And isactive has only 2 values 0 and 1
The problem is the query takes forever to run. And when I look into the explain plan, the rows for FarmerCropActivity shows 2, which is wrong
Any thoughts on this would be greatly appreciated
Thanks in advance
Rathi
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Wrong estimation of Rows in explain
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