Boy, I go to a new job and I don't have any of my old notebooks. I remember
something like this from the past from a third-party app. The first three
queries would just be verifying the existance of the object. Can't remember
if it was via a SELECT * (I don't think so) or some other similar query.
Your app isn't really doing a SELECT * since the fetch.count and fetch.rows
are both 0, so I bet it is also just object verification.
Henry
-----Original Message-----
WILLIAMS
Sent: Wednesday, September 25, 2002 1:54 PM
To: Multiple recipients of list ORACLE-L
Hello all
I am trying to debug a mysterious sporadic error that a Visual Basic
program using ADO is hitting. In reviewing the trace file, we see an odd
series of SQL statements. Before performing a 3 table join, a select * from
table is issued for each of the tables to be joined. The developer swears
ADO isn't doing this. I can't think Oracle would decide to spontaneously do
this. These are large tables so if it were really occurring, the
communications line would be tied up for a long time, but the developer is
able to get subsecond response. Has anyone seen anything like this before?
****************************************************************************
****
select *
from
source_reference
call count cpu elapsed disk query current
rows
------- ------ -------- ---------- ---------- ---------- ----------
----------
Parse 95 0.04 0.12 0 0 0
0
Execute 0 0.00 0.00 0 0 0
0
Fetch 0 0.00 0.00 0 0 0
0
------- ------ -------- ---------- ---------- ---------- ----------
----------
total 95 0.04 0.12 0 0 0
0
Misses in library cache during parse: 1
Optimizer goal: CHOOSE
Parsing user id: 18
****************************************************************************
****
select *
from
account_master
call count cpu elapsed disk query current
rows
------- ------ -------- ---------- ---------- ---------- ----------
----------
Parse 95 0.05 0.10 0 0 0
0
Execute 0 0.00 0.00 0 0 0
0
Fetch 0 0.00 0.00 0 0 0
0
------- ------ -------- ---------- ---------- ---------- ----------
---------
total 95 0.05 0.10 0 0 0
0
Misses in library cache during parse: 1
Optimizer goal: CHOOSE
Parsing user id: 18
****************************************************************************
****
select *
from
school_demographics
call count cpu elapsed disk query current
rows
------- ------ -------- ---------- ---------- ---------- ----------
----------
Parse 95 0.13 0.07 0 0 0
0
Execute 0 0.00 0.00 0 0 0
0
Fetch 0 0.00 0.00 0 0 0
0
------- ------ -------- ---------- ---------- ---------- ----------
----------
total 95 0.13 0.07 0 0 0
0
Misses in library cache during parse: 1
Optimizer goal: CHOOSE
Parsing user id: 18
****************************************************************************
****
select *
from
source_reference sr, account_master am, school_demographics sd where am.lid
>= 1 and am.lid <= 100and am.lid=sr.lid and am.lid=sd.lid order by am.lid
asc, sr.source_num asc
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 8 0.03 0.07 7 27 0
100
------- ------ -------- ---------- ---------- ---------- ----------
----------
total 10 0.06 0.10 7 27 0
100
Misses in library cache during parse: 1
Optimizer goal: CHOOSE
Parsing user id: 18
Rows Row Source Operation
------- ---------------------------------------------------
100 SORT ORDER BY
100 HASH JOIN
100 TABLE ACCESS BY INDEX ROWID SCHOOL_DEMOGRAPHICS
101 INDEX RANGE SCAN (object id 3290)
100 HASH JOIN
100 TABLE ACCESS BY INDEX ROWID SOURCE_REFERENCE
101 INDEX RANGE SCAN (object id 3294)
100 TABLE ACCESS BY INDEX ROWID ACCOUNT_MASTER
101 INDEX RANGE SCAN (object id 3214)
****************************************************************************
***
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--
Author: DENNIS WILLIAMS
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Author: Henry Poras
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