perplexing plan?

From: Doug C <dcowles_at_i84.net>
Date: Fri, 05 Oct 2001 07:27:41 -0700
Message-ID: <F001.003A3482.20011005063022@fatcity.com>

I'm a little perplexed by this query and it's associated plan. It's also a big performance problem. The problem is the 35 million row table clearly. But looking at the plan at the bottom, I'm not sure where the sorting is going on. Would anyone say the index full scan on the 35 million row table is being sorted? Or does it look more like it's being fed to a nested loops query?

Thanks,
Doug

SELECT /*+ ORDERED INDEX(S_ S15_IX1) INDEX(BUS_FID F15_UK1) INDEX(STREET   A15_IX1) */ SDE.STREET.CFCC, SDE.STREET.BUS_FID ,S_.eminx,S_.eminy,   S_.emaxx,S_.emaxy, BUS_FID.fid,BUS_FID.numofpts,BUS_FID.entity,   BUS_FID.points,BUS_FID.rowid
FROM
(SELECT /*+ INDEX(SP_ S15_IX1) */ DISTINCT sp_fid,eminx,eminy,emaxx,emaxy   FROM SDE.S15 SP_ WHERE SP_.gx >= :1 AND SP_.gx <= :2 AND SP_.gy >= :3 AND
  SP_.gy <= :4 AND SP_.eminx <= :5 AND SP_.eminy <= :6 AND SP_.emaxx >= :7   AND SP_.emaxy >= :8) S_, SDE.STREET , SDE.F15 BUS_FID WHERE S_.sp_fid =   BUS_FID.fid AND S_.sp_fid = SDE.STREET.BUS_FID

call count cpu elapsed disk query current rows
------- ------ -------- ---------- ---------- ---------- ----------

Parse 1 0.00 0.00 0 0 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 45 473.15 475.04 223532 66153503 0 4494
------- ------ -------- ---------- ---------- ---------- ----------

total 47 473.15 475.04 223532 66153503 0 4494

Misses in library cache during parse: 1
Optimizer goal: CHOOSE
Parsing user id: 20

Rows Row Source Operation
------- ---------------------------------------------------

4494 HASH JOIN
4494 NESTED LOOPS

   4495      VIEW
   4495         SORT UNIQUE
   4817           INDEX RANGE SCAN (object id 7356)
   4494      TABLE ACCESS BY INDEX ROWID STREET
   8988            INDEX UNIQUE SCAN (object id 7355)
33065402  TABLE ACCESS BY INDEX ROWID F15
33065403        INDEX FULL SCAN (object id 7283)

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--

Author: Doug C
INET: dcowles_at_i84.net

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