RE: Extremely Slow Query

From: Khedr, Waleed <Waleed.Khedr_at_FMR.COM>
Date: Thu, 02 Jan 2003 14:14:37 -0800
Message-ID: <F001.00526317.20030102141437@fatcity.com>

Are you running RAC?  

Waleed

-----Original Message-----
Sent: Thursday, January 02, 2003 3:51 PM To: Multiple recipients of list ORACLE-L

Does any know how to speed up following query?

Select *
  from dba_types
/

It is taking about 2-3 minutes on my 9202 database. I see a lot of Global Cache waits. The hammer shows following information ...

---

---

select *
from
 dba_types

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

---

Parse 1 0.00 0.01 0 2 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 30 4.14 375.13 2548 7945 0 431
------- ------ -------- ---------- ---------- ---------- ----------

---

total 32 4.14 375.15 2548 7947 0 431

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

Rows Row Source Operation

-------  --------------------------------------------------- 

    431 NESTED LOOPS OUTER (cr=7945 r=2548 w=0 time=375133913 us)     431 NESTED LOOPS OUTER (cr=7936 r=2548 w=0 time=375131832 us)     431 NESTED LOOPS (cr=7927 r=2548 w=0 time=375126319 us)

    431     NESTED LOOPS  (cr=6604 r=2548 w=0 time=375115595 us) 
 463566      TABLE ACCESS FULL OBJ#(18) (cr=5304 r=2548 w=0 time=373229866
us) 
    431      TABLE ACCESS BY INDEX ROWID OBJ#(298) (cr=1300 r=0 w=0
time=739155 us) 
    562       INDEX UNIQUE SCAN OBJ#(300) (cr=738 r=0 w=0 time=259416
us)(object id 300) 
    431     TABLE ACCESS CLUSTER OBJ#(22) (cr=1323 r=0 w=0 time=8971 us) 
    431      INDEX UNIQUE SCAN OBJ#(11) (cr=461 r=0 w=0 time=2237 us)(object
id 11) 
      4    TABLE ACCESS BY INDEX ROWID OBJ#(18) (cr=9 r=0 w=0 time=3532 us) 
      4     INDEX RANGE SCAN OBJ#(38) (cr=5 r=0 w=0 time=2960 us)(object id
38) 
      4   TABLE ACCESS CLUSTER OBJ#(22) (cr=9 r=0 w=0 time=727 us) 
      4    INDEX UNIQUE SCAN OBJ#(11) (cr=5 r=0 w=0 time=251 us)(object id

11)

Elapsed times include waiting on following events:

  Event waited on                             Times   Max. Wait  Total

Waited

• Waited ----------

  ---

  SQL*Net message to client 30 0.00 0.00 SQL*Net message from client 30 1607.50 1608.47 global cache cr request 2720 1.22 370.73 db file sequential read 18 0.00 0.01 db file scattered read 648 0.35 1.21 cr request retry 63 0.00 0.00 db file parallel read 10 0.00 0.01

  ---

---

Raj

---

Rajendra Jamadagni MIS, ESPN Inc. Rajendra dot Jamadagni at ESPN dot com
Any opinion expressed here is personal and doesn't reflect that of ESPN Inc.

QOTD: Any clod can have facts, but having an opinion is an art!

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-- 
Author: Khedr, Waleed
  INET: Waleed.Khedr_at_FMR.COM

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Received on Thu Jan 02 2003 - 16:14:37 CST