> ---------------------------------------------------------------------------
>-------- Hash Join  (cost=6793.29..1716853.80 rows=33743101 width=11)
>    Hash Cond: ("outer"."index" = "inner"."index")
>    ->  Seq Scan on lnk  (cost=0.00..535920.00 rows=33743100 width=15)
>    ->  Hash  (cost=4994.83..4994.83 rows=303783 width=4)
>          ->  Seq Scan dic  (cost=0.00..4994.83 rows=303783 width=4)
> (5 rows)

According to the estimate, you are selecting all of the rows in the database.   
This is going to require a Seq Scan no matter what.


Josh Berkus
Aglio Database Solutions
San Francisco

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