There is no rule that says an index will be cache. Yes physical reads are being done.
If the unique index is composed of more than one column look into compressing it.
Ian MacGregor
Stanford Linear Accelerator Center
[EMAIL PROTECTED]
-----Original Message-----
Sent: Thursday, September 06, 2001 1:51 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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