Re: Performance suggestions?

Allan,

Postgres is probably not the ideal solution to this problem. If you'd
like to try this though, two points:

- If the table really only has 20 rows, drop the index. If the table
really only has 20 active rows at a
time, then the planner will never use that index.
(run EXPLAIN on your query to see if it is using your index. If not, it
is only slowing you down.)

- As said before, VACUUM frequently, maybe even every 10 seconds
(experiment with different intervals.)

Paul Tillotson

>I have a small table about 20 rows, a constant, that is receiving
>about 160 updates per second.
>The table is used to share gathered data to other process asynchronously.
>After 5 min it is 12 updates per second.
>Performance returns after a vacuum analyse.
>
>I'm using 7.4.5.
>This is the table structure
> Table "public.lastscan"
> Column | Type | Modifiers
>-----------+-----------------------------+-----------
> pointnum | integer | not null
> parameter | character varying(8) | not null
> value | double precision | not null
> dt | timestamp without time zone | not null
>Indexes:
> "lsindex" btree (pointnum, parameter)
>
>
>