Re: Unexpected query plan results

Dave Dutcher wrote:

>>-----Original Message-----
>>From: Anne Rosset
>>Subject: Re: [PERFORM] Unexpected query plan results
>>
>>
>>
>>>>SELECT SUM(1) FROM item WHERE is_deleted = 'f'; sum
>>>>
>>>>
>>--------- 1824592
>>
>>
>>>>(1
>>>>row)
>>>>SELECT SUM(1) FROM item WHERE folder_id = 'tracker3641
>>>></sf/sfmain/do/go/tracker3641?returnUrlKey=1243878161701>'; sum
>>>>--------
>>>>122412 (1 row)
>>>>SELECT SUM(1) FROM item WHERE folder_id = 'tracker3641
>>>></sf/sfmain/do/go/tracker3641?returnUrlKey=1243878161701>' AND
>>>>is_deleted = 'f'; sum ----- 71 (1 row) SELECT SUM(1) FROM
>>>>
>>>>
>>item WHERE
>>
>>
>>>>folder_id = 'tracker3641
>>>></sf/sfmain/do/go/tracker3641?returnUrlKey=1243878161701>' AND
>>>>is_deleted = 't'; sum -------- 122341 (1 row)
>>>>
>>>>
>>>>
>>>>
>>>Something's not right here. If the whole table has only
>>>
>>>
>>468173 rows,
>>
>>
>>>you can't have 1.8 million deleted rows where is_deleted = false.
>>>
>>>...Robert
>>>
>>>
>>>
>>>
>>The item table has 2324829 rows
>>The artifact table has 468173 rows.
>>Thanks,
>>Anne
>>
>>
>
>I'd been thinking about the sort, but I hadn't thought yet if that index
>scan on item could be made faster. Could you post the table definition of
>item including the indexes on it?
>
>Dave
>
>
>
>
>
>
Dave:
Table "public.item"
Column | Type | Modifiers
---------------------+--------------------------+-----------
id | character varying(32) | not null
name | character varying(128) |
title | character varying(255) |
version | integer | not null
date_created | timestamp with time zone | not null
date_last_modified | timestamp with time zone | not null
is_deleted | boolean | not null
type_id | character varying(32) |
folder_id | character varying(32) |
planning_folder_id | character varying(32) |
created_by_id | character varying(32) |
last_modified_by_id | character varying(32) |
Indexes:
"item_pk" primary key, btree (id)
"item_created_by_id" btree (created_by_id)
"item_date_created" btree (date_created)
"item_folder" btree (folder_id)
"item_name" btree (name)
"item_planning_folder" btree (planning_folder_id)

Thanks,
Anne