Re: planer picks a bad plan (seq-scan instead of index)

[Richard Huxton <dev@xxxxxxxxxxxx>]

Thomas H. wrote:
> --------------------
> SELECT * FROM shop.dvds
> LEFT JOIN oldtables.movies ON mov_id = dvd_mov_id
> LEFT JOIN shop.data_soundmedia ON sm_info_ean = dvd_ean
> WHERE (lower(mov_name) LIKE '%superman re%' OR lower(dvd_name) like 
> '%superman re%' OR lower(dvd_edition) LIKE '%superman re%')
> --------------------

Try putting your conditions as part of the join:
SELECT * FROM shop.dvds
LEFT JOIN
  oldtables.movies
ON
  mov_id = dvd_mov_id
  AND (
    lower(mov_name) LIKE '%superman re%'
    OR lower(dvd_name) like '%superman re%'
    OR lower(dvd_edition) LIKE '%superman re%'
  )
LEFT JOIN shop.data_soundmedia ON sm_info_ean = dvd_ean

I'd also be tempted to look at a tsearch2 setup for the word searches.
--
  Richard Huxton
  Archonet Ltd