OCI - Array-Fetch vs. One-row-per-fetch

Hello guys,
i have a question about the OCI and the possibilities about fetches.
Is it possible to get only one row per fetch without setting the array size to 1?
I have a third party application that shows this behaviour which i have rebuild in sqlplus.
SQL> create table mytest (a number);
SQL> begin
2 for i in 1 .. 1500 loop
3 insert into mytest values (i);
4      end loop;
5 end;
6 /
PL/SQL procedure successfully completed.
SQL> commit;
Commit complete.
SQL> set autotrace traceonly;
-- Now with the default array size of 15 with sqlplus
SQL> select * from mytest;
     118 consistent gets
     101 SQL*Net roundtrips to/from client
     1500 rows processed
-- Now with a bigger array size (150)
SQL> set arraysize 150
SQL> select * from mytest;
     17 consistent gets
     11 SQL*Net roundtrips to/from client
     1500 rows processed
-- Now the behaviour of the third party application
SQL> set arraysize 1
SQL> select * from mytest;
     757 consistent gets
     751 SQL*Net roundtrips to/from client
     1500 rows processed
SQL> set arraysize 2
SQL> select * from mytest;
     757 consistent gets
     751 SQL*Net roundtrips to/from client
     1500 rows processedThe third party application is a c program and i can not take a look at the code.
So as you can see the consistent gets are the same with arraysize 1 and 2. The sql statement which is executed of the c-program is returning a huge amount of data and it seems like it is run with arraysize 1 or 2 or it is executing a different OCI call.
So now is my question:
Which methods does the OCI interface provide to recieve (fetch) data?
- Is it only array fetching (like sqlplus do) or is it possible to return only one row per fetch with a specific call.
I can speed up the query by setting the bigger array-size in sqlplus .. but i want to point the programers to the possibilities with the OCI.
Thanks and Regards
Stefan

The following call in OCI can be used to control the fetched rows
MAX_PREFETCH_ROWS is number of rows you want to fetch in one round trip.
(void) OCIAttrSet((dvoid *)DBctx->stmthp, (ub4) OCI_HTYPE_STMT,
(dvoid *)&MAX_PREFETCH_ROWS,(ub4)sizeof(MAX_PREFETCH_ROWS),(ub4) OCI_ATTR_PREFETCH_ROWS, DBctx->errhp);

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Please Mark This As Answer if it solved your issue
Please Vote This As Helpful if it helps to solve your issue
Visakh
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            select to_date('05/09/2009','MM/DD/YYYY') Visit_Date, 'G' Visit_type, 'name2' Consultant from dual
            union all
            select to_date('05/09/2009','MM/DD/YYYY') Visit_Date, 'G' Visit_type, 'name3' Consultant from dual
            union all
            select to_date('06/09/2009','MM/DD/YYYY') Visit_Date, 'G' Visit_type, 'name4' Consultant from dual
            union all
            select to_date('07/09/2009','MM/DD/YYYY') Visit_Date, 'G' Visit_type, 'name5' Consultant from dual
            union all
            select to_date('07/09/2009','MM/DD/YYYY') Visit_Date, 'G' Visit_type, 'name6' Consultant from dual
            union all
            select to_date('07/09/2009','MM/DD/YYYY') Visit_Date, 'F' Visit_type, 'name7' Consultant from dual)
select trunc(visit_date) visit_date, min(visit_type) visit_type, min(consultant)
from   dd
group by trunc(visit_date)
order by trunc(visit_date);
VISIT_DAT V MIN(C
09/MAY/09 G name1
09/JUN/09 G name4
09/JUL/09 F name5

Looping over multiple rows of data to output one row

My query is giving me the appropriate data, but I need to
only have one row per 'MANAGER' in my output - not one for each
'JOB'. Now the output looks like this:
manager 1 ... period 1 $ .... period 2 $ .... period 3 $
manager 1... period 1 $ .... period 2 $ .... period 3 $
manager 1... period 1 $ .... period 2 $ .... period 3 $
manager 1... period 1 $ .... period 2 $ .... period 3 $
manager 2... period 1 $ .... period 2 $ .... period 3 $
manager 2... period 1 $ .... period 2 $ .... period 3 $
manager 2... period 1 $ .... period 2 $ .... period 3 $
manager 2... period 1 $ .... period 2 $ .... period 3 $
It needs to be:
Manager 1 ... total period 1 $ .... total period 2 $ ....
Manager 2 ... total period 1 $ .... total period 2 $ ....
Any help would be wonderful. I am really new at something
this complex. Thanks!!!

To fix your immediate issue, you need to order and group by
manager, not MPR_ID (whatever that is).
What is dm_id? Use descriptive names!
Anyway, change the ORDER BY clause to:
ORDER BY
RR.LastName+', '+RR.FirstName, 
AA.MPR_ID
Then change the first <cfoutput> to:
<cfoutput query="production" group="Rep_name">

SQL*Plus two fetches for getting one row.

Hi all.
I have tested following script.
alter session set events '10046 trace name context forever, level 12';
select * from dual;And achieved such results (extract from .trc file).
SQL*Plus: Release 11.2.0.1.0; (Oracle Version 10.2.0.4.0, 11.2.0.1.0)
call     count       cpu    elapsed       disk      query    current        rows
Parse        1      0.00       0.00          0          0          0           0
Execute      1      0.00       0.00          0          0          0           0
Fetch        2      0.00       0.00          0          0          0           1
total        4      0.00       0.00          0          0          0           1SQL*Plus: Release 8.1.7.0.0; (Oracle Version 8.1.7.0.0)
call     count       cpu    elapsed       disk      query    current        rows
Parse        1      0.00       0.00          0          0          0           0
Execute      2      0.00       0.00          0          0          0           0
Fetch        2      0.00       0.00          0          1          4           1
total        5      0.00       0.00          0          1          4           1Allround Automations PL/SQL Developer 8.0.4; (Oracle Version 10.2.0.4.0, 11.2.0.1.0)
call     count       cpu    elapsed       disk      query    current        rows
Parse        1      0.00       0.00          0          0          0           0
Execute      1      0.00       0.00          0          0          0           0
Fetch        1      0.00       0.00          0          0          0           1
total        3      0.00       0.00          0          0          0           1Allround Automations PL/SQL Developer 8.0.4; (Oracle Version 8.1.7.0.0)
call     count       cpu    elapsed       disk      query    current        rows
Parse        1      0.00       0.00          0          0          0           0
Execute      1      0.00       0.00          0          0          0           0
Fetch        1      0.00       0.00          0          1          4           1
total        3      0.00       0.00          0          1          4           11) I can't figure out why sqlplus does TWO fetches for getting ONE row (instead of pl/sql developer).
8i raw trace
PARSING IN CURSOR #1 len=31 dep=0 uid=0 oct=3 lid=0 tim=0 hv=3549852361 ad='4a0155c'
select 'hello world' from dual
END OF STMT
PARSE #1:c=0,e=0,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=4,tim=0
BINDS #1:
EXEC #1:c=0,e=0,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=4,tim=0
WAIT #1: nam='SQL*Net message to client' ela= 0 p1=1111838976 p2=1 p3=0
FETCH #1:c=0,e=0,p=0,cr=1,cu=4,mis=0,r=1,dep=0,og=4,tim=0
WAIT #1: nam='SQL*Net message from client' ela= 0 p1=1111838976 p2=1 p3=0
FETCH #1:c=0,e=0,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=0,tim=0
WAIT #1: nam='SQL*Net message to client' ela= 0 p1=1111838976 p2=1 p3=0
WAIT #1: nam='SQL*Net message from client' ela= 0 p1=1111838976 p2=1 p3=0
STAT #1 id=1 cnt=1 pid=0 pos=0 obj=195 op='TABLE ACCESS FULL DUAL '11g raw trace
PARSING IN CURSOR #3 len=30 dep=0 uid=96 oct=3 lid=96 tim=1581355246985 hv=1158622143 ad='b8a1bcdc' sqlid='5h2yvx92hyaxz'
select 'hello world' from dual
END OF STMT
PARSE #3:c=0,e=130,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=1,plh=1388734953,tim=1581355246984
EXEC #3:c=0,e=40,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=1,plh=1388734953,tim=1581355247154
WAIT #3: nam='SQL*Net message to client' ela= 7 driver id=1111838976 #bytes=1 p3=0 obj#=-1 tim=1581355247252
FETCH #3:c=0,e=18,p=0,cr=0,cu=0,mis=0,r=1,dep=0,og=1,plh=1388734953,tim=1581355247324
STAT #3 id=1 cnt=1 pid=0 pos=1 obj=0 op='FAST DUAL (cr=0 pr=0 pw=0 time=0 us cost=2 size=0 card=1)'
WAIT #3: nam='SQL*Net message from client' ela= 193 driver id=1111838976 #bytes=1 p3=0 obj#=-1 tim=1581355247735
FETCH #3:c=0,e=2,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=0,plh=1388734953,tim=1581355247800
WAIT #3: nam='SQL*Net message to client' ela= 5 driver id=1111838976 #bytes=1 p3=0 obj#=-1 tim=15813552478552) Is there any possibility to view data provided by each fetch?
Thanks in advance!
P.S.
SQL> sho arraysize
arraysize 15

Thanks.
I have tested two statements.
select 'hello world' from dual where 1=1;
select 'hello world' from dual where 1=0;When query returns no data, there is only one SQL*Net roundtrip (and one fetch)
SQL> set autot on statistics
SQL> select 'hello world' from dual where 1=1;
'HELLOWORLD
hello world
Statistics
          0 recursive calls
          0 db block gets
          0 consistent gets
          0 physical reads
          0 redo size
        528 bytes sent via SQL*Net to client
        492 bytes received via SQL*Net from client
          2 SQL*Net roundtrips to/from client
          0 sorts (memory)
          0 sorts (disk)
          1 rows processed
SQL> select 'hello world' from dual where 1=0;
no rows selected
Statistics
          0 recursive calls
          0 db block gets
          0 consistent gets
          0 physical reads
          0 redo size
        329 bytes sent via SQL*Net to client
        481 bytes received via SQL*Net from client
          1 SQL*Net roundtrips to/from client
          0 sorts (memory)
          0 sorts (disk)
          0 rows processedBut in both cases i found in client trace this sequence of bytes:
] nsprecv: 00 00 36 01 00 00 00 00 |..6.....|
] nsprecv: 00 00 00 00 00 00 00 00 |........|
] nsprecv: 00 00 90 19 43 13 00 00 |....C...|
] nsprecv: 00 00 00 00 00 00 00 00 |........|
] nsprecv: 00 00 00 00 00 00 00 00 |........|
] nsprecv: 00 00 00 00 00 00 00 00 |........|
] nsprecv: 00 00 00 00 00 00 00 00 |........|
] nsprecv: 00 00 00 00 00 00 00 00 |........|
] nsprecv: 00 00 00 00 00 00 00 00 |........|
] nsprecv: 00 00 00 00 00 00 00 00 |........|
] nsprecv: 00 00 19 4F 52 41 2D 30 |...ORA-0|
] nsprecv: 31 34 30 33 3A 20 6E 6F |1403:.no|
] nsprecv: 20 64 61 74 61 20 66 6F |.data.fo|
] nsprecv: 75 6E 64 0A              |und.    |In first case - it was in 2nd packet and in second case (query returns no data) - part of 1st packet.

OCI - Array-Fetch vs. One-row-per-fetch

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