Horton

Thread

  1. Heh, what's this?

    Karl Denninger <karl@mcs.net> — 1998-03-09T19:23:54Z

    The following query returns:

explain update user set inter = person.inter where person.custid = user.custid;

NOTICE:  QUERY PLAN:
 
 Nested Loop  (cost=1095.16 size=1 width=370)
   ->  Seq Scan on person  (cost=1095.16 size=16035 width=8)
   ->  Seq Scan on user  (cost=0.00 size=0 width=362)
      
EXPLAIN

Uh, this is a problem.

Both person and user have an index on "custid".  6.2.1 used to utilize them.

You have to do a sequential scan on user, but NOT on person to perform 
this update.

--
-- 
Karl Denninger (karl@MCS.Net)| MCSNet - Serving Chicagoland and Wisconsin
http://www.mcs.net/          | T1's from $600 monthly to FULL DS-3 Service
			     | NEW! K56Flex support on ALL modems
Voice: [+1 312 803-MCS1 x219]| EXCLUSIVE NEW FEATURE ON ALL PERSONAL ACCOUNTS
Fax:   [+1 312 803-4929]     | *SPAMBLOCK* Technology now included at no cost