Very low performance on table with only 298 rows - Mailing list pgsql-sql

nbeweb=> EXPLAIN select count(*) from onp_web_index;                                QUERY PLAN
-----------------------------------------------------------------------------
Hi all.
I have a problem with a table which only has 298 rows in it. A select count(*)
takes forever and CTRL-C also takes a long time canceling the query. There
are only 298 rows in the table when count(*) returns. How come it takes such
a long time counting only 298 rows? Here is EXPLAIN ANALYZE:

nbeweb=> EXPLAIN ANALYZE select count(*) from onp_web_index;
QUERYPLAN 

-----------------------------------------------------------------------------------------------------------------------------------Aggregate
(cost=205759.52..205759.52 rows=1 width=0) (actual  
time=179748.910..179748.913 rows=1 loops=1)  ->  Seq Scan on onp_web_index  (cost=0.00..205455.41 rows=121641 width=0)
(actual time=179735.956..179747.821 rows=298 loops=1)Total runtime: 179748.993 ms
(3 rows)


Here is the schema:

nbeweb=> \d onp_web_index;                                 Table "public.onp_web_index"  Column    |       Type
|                          Modifiers 
-------------+-------------------+---------------------------------------------------------------id          | integer
        | not null default  
nextval('public.onp_web_index_id_seq'::text)starturl_id | integer           | not nulllang_id     | integer           |
notnullurl_host    | character varying | not nullurl_path    | character varying | not nulltitle       | character
varying| not nullcontent     | tsvector          | not nullplain_text  | character varying | not null 
Indexes:   "onp_web_index_pkey" primary key, btree (id)   "onp_web_index_url_host_key" unique, btree (url_host,
url_path)  "onp_web_index_idx" gist (content) 
Foreign-key constraints:   "$2" FOREIGN KEY (lang_id) REFERENCES code(id)   "$1" FOREIGN KEY (starturl_id) REFERENCES
onp_web_index_starturl(id)ON  
DELETE CASCADE

Any hints on how I can "fix" this lousy performance?

--
Andreas Joseph Krogh <andreak@officenet.no>
Senior Software Developer / Manager
gpg public_key: http://dev.officenet.no/~andreak/public_key.asc
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