Re: Need help optimizing this query

On 7/18/07, Pat Maddox <pergesu@gmail.com> wrote:
> I've got a query that's taking forever (as will be obvious when you
> see it and the explain output).  I can't figure out what indexes to
> add to make this run faster.  I'd appreciate any help.
>
> Pat
>
>
>
> SELECT
>  SUM(CASE WHEN (hit IS TRUE AND logged_in IS TRUE) THEN 1 ELSE 0 END)
> AS count_hits_console,
>  SUM(CASE WHEN (hit IS TRUE AND logged_in IS FALSE) THEN 1 ELSE 0 END)
> AS count_hits_remote,
>  SUM(CASE WHEN (played IS TRUE AND logged_in IS TRUE) THEN 1 ELSE 0
> END) AS count_played_console,
>  SUM(CASE WHEN (played IS TRUE AND logged_in IS FALSE) THEN 1 ELSE 0
> END) AS count_played_remote,
>  SUM(CASE WHEN (downloaded IS TRUE AND logged_in IS TRUE) THEN 1 ELSE
> 0 END) AS count_downloaded_console,
>  SUM(CASE WHEN (downloaded IS TRUE AND logged_in IS FALSE) THEN 1 ELSE
> 0 END) AS count_downloaded_remote,
>  SUM(CASE WHEN ((played IS TRUE OR downloaded IS TRUE) AND logged_in
> IS TRUE) THEN assets.size ELSE 0 END) as download_size_console,
>  SUM(CASE WHEN ((played IS TRUE OR downloaded IS TRUE) AND logged_in
> IS FALSE) THEN assets.size ELSE 0 END) as download_size_remote,
> videos.id, videos.title, videos.guid FROM video_views, assets, videos
> WHERE videos.company_id=1 AND video_views.video_id=videos.id AND
> video_views.asset_id=assets.id GROUP BY videos.id, videos.title,
> videos.guid ORDER BY count_hits_remote DESC LIMIT 100
>
>
>
>
> Limit  (cost=139735.51..139735.68 rows=69 width=64)
>    ->  Sort  (cost=139735.51..139735.68 rows=69 width=64)
>          Sort Key: sum(CASE WHEN ((video_views.hit IS TRUE) AND
> (video_views.logged_in IS FALSE)) THEN 1 ELSE 0 END)
>          ->  HashAggregate  (cost=139731.33..139733.40 rows=69 width=64)
>                ->  Hash Join  (cost=1164.79..138880.04 rows=30956 width=64)
>                      Hash Cond: (video_views.asset_id = assets.id)
>                      ->  Hash Join  (cost=324.39..137343.13 rows=30956 width=60)
>                            Hash Cond: (video_views.video_id = videos.id)
>                            ->  Seq Scan on video_views
> (cost=0.00..114500.13 rows=5922413 width=12)
>                            ->  Hash  (cost=323.52..323.52 rows=69 width=52)
>                                  ->  Bitmap Heap Scan on videos
> (cost=64.90..323.52 rows=69 width=52)
>                                        Recheck Cond: (company_id = 1)
>                                        ->  Bitmap Index Scan on
> complete_videos_without_deleted_at  (cost=0.00..64.88 rows=69 width=0)
>                                              Index Cond: (company_id = 1)
>                      ->  Hash  (cost=645.18..645.18 rows=15618 width=12)
>                            ->  Seq Scan on assets  (cost=0.00..645.18
> rows=15618 width=12)
>


Here are the indexes I already have on the table:

    "video_views_pkey" PRIMARY KEY, btree (id)
    "index_video_views_on_asset_id" btree (asset_id)
    "index_video_views_on_video_id" btree (video_id)
    "index_video_views_on_video_id_and_asset_id_and_created_at" btree
(video_id, created_at, asset_id)