Re: Why do I need more time with partition table?

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Thanks. I missed to add the trigger.
Now I added it, but still without partition taking less time compared to with partition query.

With partition :- 

explain analyze
select * 
from table1  as c
inner join table2 as a on c.crmid = a.activityid and deleted = 0
where module ='Leads'
;

                                                                      QUERY PLAN                                                                      
------------------------------------------------------------------------------------------------------------------------------------------------------
 Hash Join  (cost=25669.79..86440.88 rows=288058 width=367) (actual time=4411.734..4411.734 rows=0 loops=1)
   Hash Cond: (a.activityid = c.crmid)
   ->  Seq Scan on table2 a  (cost=0.00..18337.34 rows=681434 width=139) (actual time=0.264..1336.555 rows=681434 loops=1)
   ->  Hash  (cost=13207.07..13207.07 rows=288058 width=228) (actual time=1457.495..1457.495 rows=287365 loops=1)
         Buckets: 1024  Batches: 128  Memory Usage: 226kB
         ->  Append  (cost=0.00..13207.07 rows=288058 width=228) (actual time=0.014..1000.182 rows=287365 loops=1)
               ->  Seq Scan on table1 c  (cost=0.00..0.00 rows=1 width=367) (actual time=0.001..0.001 rows=0 loops=1)
                     Filter: ((deleted = 0) AND ((module)::text = 'Leads'::text))
               ->  Seq Scan on table1_leads c  (cost=0.00..13207.07 rows=288057 width=228) (actual time=0.010..490.169 rows=287365 loops=1)
                     Filter: ((deleted = 0) AND ((module)::text = 'Leads'::text))
 Total runtime: 4412.534 ms
(11 rows)

Without partition :- 

explain analyze
select * 
from table1_old  as c
inner join table2 as a on c.crmid = a.activityid and deleted = 0
where module ='Leads'
;
                                                                        QUERY PLAN                                                                        
----------------------------------------------------------------------------------------------------------------------------------------------------------
 Hash Join  (cost=92095.07..157111.03 rows=107445 width=502) (actual time=3795.273..3795.273 rows=0 loops=1)
   Hash Cond: (a.activityid = c.crmid)
   ->  Seq Scan on table2 a  (cost=0.00..18337.34 rows=681434 width=139) (actual time=0.030..812.925 rows=681434 loops=1)
   ->  Hash  (cost=73246.44..73246.44 rows=314850 width=363) (actual time=1377.624..1377.624 rows=287365 loops=1)
         Buckets: 1024  Batches: 128  Memory Usage: 226kB
         ->  Bitmap Heap Scan on table1_old c  (cost=9228.69..73246.44 rows=314850 width=363) (actual time=83.189..926.542 rows=287365 loops=1)
               Recheck Cond: (((module)::text = 'Leads'::text) AND (deleted = 0))
               ->  Bitmap Index Scan on crmentity_module_idx  (cost=0.00..9149.98 rows=314850 width=0) (actual time=79.357..79.357 rows=287365 loops=1)
                     Index Cond: ((module)::text = 'Leads'::text)
 Total runtime: 3795.721 ms
(10 rows)


On Tue, Jul 24, 2012 at 5:46 PM, Jan Otto <asche@xxxxxx> wrote:
hi al,

> With Parition :-
>
>
> explain analyze
> select *
> from table1  as c
> inner join table2 as a on c.crmid = a.table2id and deleted = 0
> where module ='Leads';
>                                                                                 QUERY PLAN
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>  Hash Join  (cost=108101.50..175252.57 rows=313256 width=506) (actual time=8430.588..8430.588 rows=0 loops=1)
>    Hash Cond: (a.table2id = c.crmid)
>    ->  Seq Scan on table2 a  (cost=0.00..18337.34 rows=681434 width=139) (actual time=0.054..870.554 rows=681434 loops=1)
>    ->  Hash  (cost=89195.80..89195.80 rows=313256 width=367) (actual time=2751.950..2751.950 rows=287365 loops=1)
>          Buckets: 1024  Batches: 128  Memory Usage: 226kB
>          ->  Append  (cost=0.00..89195.80 rows=313256 width=367) (actual time=0.034..2304.191 rows=287365 loops=1)
>                ->  Seq Scan on table1 c  (cost=0.00..89187.53 rows=313255 width=367) (actual time=0.032..1783.075 rows=287365 loops=1)
>                      Filter: ((deleted = 0) AND ((module)::text = 'Leads'::text))
>                ->  Index Scan using table1_leads_deleted_idx on table1_leads c  (cost=0.00..8.27 rows=1 width=280) (actual time=0.010..0.010 rows=0 loops=1)
>                      Index Cond: (deleted = 0)
>                      Filter: ((module)::text = 'Leads'::text)
>  Total runtime: 8432.024 ms
> (12 rows)
>
> I set constraint_exclusion to partition.
>
> Why do I need more time with parition?

it looks like you don't moved your data from base-table to your partitions.

regards, jan



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