Ussually the leaf blocks will cause physical reads, but generally the root
and branch blocks stay in the cache. But it is very possibly for them all
to be in the cache and it is also just as possible for none of them to be in
the cache.
Oracle favor's caching index blocks, but doesn't mean index scans will not
cause physical reads.
"Do not criticize someone until you walked a mile in their shoes, that way
when you criticize them, you are a mile a way and have their shoes."
Christopher R. Spence
Oracle DBA
Phone: (978) 322-5744
Fax: (707) 885-2275
Fuelspot
73 Princeton Street
North, Chelmsford 01863
-----Original Message-----
Sent: Thursday, September 06, 2001 4:51 PM
To: Multiple recipients of list ORACLE-L
I am confused by the output from tkprof below. An fast full index
scan is being performed. However, from the statistics, it looks as
thought 649 physical disk reads are being performed. Is that actually
the case? Are physical disk reads being done?
Thanks,
Cherie Machler
Oracle DBA
Gelco Information Network
****************************************************************************
****
Select SD.KS_OBJECTID as CONCEPTID
>From kbowner.KS_SHORTDESCRIPTION SD
Where SD.KS_DESCRIPTIONTYPE = 'CPTNAME' And
UPPER(SD.KS_DESCRIPTIONTEXT) = ''
call count cpu elapsed disk query current
rows
------- ------ -------- ---------- ---------- ---------- ----------
----------
Parse 1 0.03 0.03 0 0 0
0
Execute 1 0.00 0.00 0 0 0
0
Fetch 1 0.30 0.30 649 649 4
0
------- ------ -------- ---------- ---------- ---------- ----------
----------
total 3 0.33 0.33 649 649 4
0
Rows Row Source Operation
------- ---------------------------------------------------
0 INDEX FAST FULL SCAN (object id 5286)
Rows Execution Plan
------- ---------------------------------------------------
0 SELECT STATEMENT GOAL: CHOOSE
0 INDEX GOAL: ANALYZED (FAST FULL SCAN) OF 'SYS_C001069' (UNIQUE)
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