Oracle-L: Re: Extremely Slow Query

From: Shaleen <shgarg_orafaq_at_hotmail.com>
Date: Thu, 02 Jan 2003 14:24:33 -0800
Message-ID: <F001.00526369.20030102142433@fatcity.com>

Extremely Slow QueryDoesnt seem to be a problem in my 9013 instance. returned 240 rows in 1.26 elapsed seconds

Original Message ----- From: Jamadagni, Rajendra To: Multiple recipients of list ORACLE-L Sent: Thursday, January 02, 2003 12:51 PM Subject: Extremely Slow Query

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: Shaleen
INET: shgarg_orafaq_at_hotmail.com

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