With query and table access

I am using WITH query to reduce the scanning the teacher table thrice for the below query
xe > with q as
2 (select teacher_id,subject_1,subject_2,subject_3 from teacher
3 )
4 select teacher_id,subject_1 from q
5 union all
6 select teacher_id,subject_2 from q
7 union all
8 select teacher_id,subject_3 from q
9 /
However, the execution plan shows that the table was scanned for twice.
Execution Plan
Plan hash value: 91048842
| Id | Operation          | Name    | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT   |         |     6 |   180 |     6 (67)| 00:00:01 |
|   1 | UNION-ALL         |         |       |       |            |          |
| 2 |   TABLE ACCESS FULL| TEACHER |     2 |    60 |     2   (0)| 00:00:01 |
|   3 |   TABLE ACCESS FULL| TEACHER |     2 |    60 |     2   (0)| 00:00:01 |
|   4 |   TABLE ACCESS FULL| TEACHER |     2 |    60 |     2   (0)| 00:00:01 |
Note
   - dynamic sampling used for this statement (level=2)
Statistics
         10 recursive calls
          0 db block gets
         22 consistent gets
          0 physical reads
          0 redo size
        594 bytes sent via SQL*Net to client
        420 bytes received via SQL*Net from client
          2 SQL*Net roundtrips to/from client
          0 sorts (memory)
          0 sorts (disk)
          6 rows processed
Why the table was scanned thrice?
Thanks for your time..

Hi,
A SQL query describes the result set you want; it does not show how the system gets those results. Don't expect how the query code looks to have much to do with what the system will do. For example, the fact that the code only says "teacher" 1 time doesn't mean that the teacher table will only be scanned 1 time.
Try
SELECT    teacher_id, subject
FROM      teacher
UNPIVOT   ( subject
          FOR subject_num IN ( subject_1 AS 1
                              , subject_2 AS 2
                              , subject_3 AS 3

Similar Messages

Simple test case with NL and table order .

Hi,
did some tests on my 9.2.0.8 and got few questions:
SQL> select count(*) from p;
COUNT(*)
      2000
SQL> select count(*) from c;
COUNT(*)
      1000
SQL> select count(*) , id from p group by id having count(*) > 1;
no rows selected
SQL> select count(*) , id from c group by id having count(*) > 1;
COUNT(*)         ID
       100         10
SQL> desc p
           Name
    1      ID number
    2      FILLER varchar2(100)
SQL> desc c
           Name
    1      ID number
    2      FILLER varchar2(100)
Got 10046 traces:
case A
select /*+ use_nl(p) leading(c) */ *
from
p , c where p.id = c.id and c.id in (10)
Rows     Row Source Operation
    100 TABLE ACCESS BY INDEX ROWID P
    201   NESTED LOOPS
    100    TABLE ACCESS BY INDEX ROWID C
    100     INDEX RANGE SCAN C_ID (object id 411255)
    100    INDEX RANGE SCAN P_ID (object id 411256)
Case B optimal
select /*+ use_nl(c) leading(p) */ *
from
p , c where p.id = c.id and c.id in (10)
Rows     Row Source Operation
    100 TABLE ACCESS BY INDEX ROWID C
    102   NESTED LOOPS
      1    TABLE ACCESS BY INDEX ROWID P
      1     INDEX RANGE SCAN P_ID (object id 411256)
    100    INDEX RANGE SCAN C_ID (object id 411255)So its simple nested loop with postponed inner table access .
Why in row source operation we have got 102 rows (NL level) ? (It means NL was executed 102 times ?)
And why 201 in other case ?
Regards
GregG

I am not sure about the calculation/reason for those A-ROWS figures but the NL operation executes only once (but accesses inner rowsource 100 times in case one and once in second case) in both cases (which is as expected).
A closer test case (to OP) is
SQL> select * from v$version ;
BANNER
Oracle Database 10g Release 10.2.0.5.0 - Production
PL/SQL Release 10.2.0.5.0 - Production
CORE     10.2.0.5.0     Production
TNS for Linux: Version 10.2.0.5.0 - Production
NLSRTL Version 10.2.0.5.0 - Production
SQL> create table p nologging as select level as id, cast(dbms_random.string('a', 100) as varchar2(100)) as filler from dual connect by level <= 2000 ;
Table created.
SQL> exec dbms_stats.gather_table_stats(user, 'P') ;
PL/SQL procedure successfully completed.
SQL> create index p_id on p(id) nologging ;
Index created.
SQL> select count(*) from p;
COUNT(*)
      2000
SQL> select count(*) , id from p group by id having count(*) > 1;
no rows selected
SQL> create table c nologging as select level as id, cast(dbms_random.string('a', 100) as varchar2(100)) as filler from dual connect by level <= 900 union all select 10, cast(dbms_random.string('a', 100) as varchar2(100)) as filler from dual connect by level <= 99 ;
Table created.
SQL> select count(*) , id from c group by id having count(*) > 1;
COUNT(*)         ID
       100         10
SQL> exec dbms_stats.gather_table_stats(user, 'C') ;
PL/SQL procedure successfully completed.
SQL> create index c_id on c(id) nologging ;
Index created.
SQL> select /*+ use_nl(p) leading(c) gather_plan_statistics */ * from p , c where p.id = c.id and c.id in (10) ;
        ID FILLER                                                                                                       ID
FILLER
        10 opKRJynLxjeCiOScvOklQBXfpnfgvlhHNLzlKKrFaNzQLODKSnKMxpzecqyFkVSLvdosZJhWckBcQbpIaqttahlqBxrugKQVrnIk         10
zrGZSmUFXNyNMOViUYSvPDdfznSlMvaFnQakopPtcBvXQkWmMlWCnrPyeZLfhuLLeYyAEkcwZNSfoASLYpoAnpESqlQWkaEGatXV
        10 opKRJynLxjeCiOScvOklQBXfpnfgvlhHNLzlKKrFaNzQLODKSnKMxpzecqyFkVSLvdosZJhWckBcQbpIaqttahlqBxrugKQVrnIk         10
hKtrWPCfAmWWLGMXfwHCusSwVpehEnZdxYPLouIuBlMMiSKlIJWwklZCAXZaCbIxKlhzBVRhhTPdLcheyAdoYyfxwomqWRrMXuMk
        10 opKRJynLxjeCiOScvOklQBXfpnfgvlhHNLzlKKrFaNzQLODKSnKMxpzecqyFkVSLvdosZJhWckBcQbpIaqttahlqBxrugKQVrnIk         10
ncSqclZvOGgyXDPaaouGaUqXmJtFNbNyFzUalDknEMvTsBRwGmTxOCIalLvqMnuTFBZJGzNfBqaSVHUtvNDceVZqKQQyqeGKOUdz
100 rows selected.
SQL> select * from table(dbms_xplan.display_cursor(null, null, 'ALLSTATS LAST')) ;
PLAN_TABLE_OUTPUT
SQL_ID 1f55m4rabtu3h, child number 0
select /*+ use_nl(p) leading(c) gather_plan_statistics */ * from p , c where p.id = c.id and
c.id in (10)
Plan hash value: 2553281496
| Id | Operation                     | Name | Starts | E-Rows | A-Rows |   A-Time   | Buffers | Reads |
|   0 | SELECT STATEMENT              |      |      0 |        |      0 |00:00:00.01 |       0 |      0 |
|   1 | TABLE ACCESS BY INDEX ROWID | P    |      1 |      1 |    100 |00:00:00.01 |     112 |      2 |
|   2 |   NESTED LOOPS                |      |      1 |      1 |    201 |00:00:00.02 |     110 |      2 |
|   3 |    TABLE ACCESS BY INDEX ROWID| C    |      1 |      1 |    100 |00:00:00.01 |       7 |      1 |
|* 4 |     INDEX RANGE SCAN          | C_ID |      1 |      1 |    100 |00:00:00.01 |       3 |      1 |
|* 5 |    INDEX RANGE SCAN           | P_ID |    100 |      1 |    100 |00:00:00.01 |     103 |      1 |
Predicate Information (identified by operation id):
   4 - access("C"."ID"=10)
   5 - access("P"."ID"=10)
24 rows selected.
SQL> select /*+ use_nl(c) leading(p) gather_plan_statistics */ * from p , c where p.id = c.id and c.id in (10) ;
        ID FILLER                                                                                                       ID
FILLER
        10 opKRJynLxjeCiOScvOklQBXfpnfgvlhHNLzlKKrFaNzQLODKSnKMxpzecqyFkVSLvdosZJhWckBcQbpIaqttahlqBxrugKQVrnIk         10
zrGZSmUFXNyNMOViUYSvPDdfznSlMvaFnQakopPtcBvXQkWmMlWCnrPyeZLfhuLLeYyAEkcwZNSfoASLYpoAnpESqlQWkaEGatXV
        10 opKRJynLxjeCiOScvOklQBXfpnfgvlhHNLzlKKrFaNzQLODKSnKMxpzecqyFkVSLvdosZJhWckBcQbpIaqttahlqBxrugKQVrnIk         10
hKtrWPCfAmWWLGMXfwHCusSwVpehEnZdxYPLouIuBlMMiSKlIJWwklZCAXZaCbIxKlhzBVRhhTPdLcheyAdoYyfxwomqWRrMXuMk
        10 opKRJynLxjeCiOScvOklQBXfpnfgvlhHNLzlKKrFaNzQLODKSnKMxpzecqyFkVSLvdosZJhWckBcQbpIaqttahlqBxrugKQVrnIk         10
ncSqclZvOGgyXDPaaouGaUqXmJtFNbNyFzUalDknEMvTsBRwGmTxOCIalLvqMnuTFBZJGzNfBqaSVHUtvNDceVZqKQQyqeGKOUdz
100 rows selected.
SQL> select * from table(dbms_xplan.display_cursor(null, null, 'ALLSTATS LAST')) ;
PLAN_TABLE_OUTPUT
SQL_ID 7hvf1zvsvfhdp, child number 0
select /*+ use_nl(c) leading(p) gather_plan_statistics */ * from p , c where p.id =
c.id and c.id in (10)
Plan hash value: 2133717140
| Id | Operation                     | Name | Starts | E-Rows | A-Rows |   A-Time   | Buffers |
|   0 | SELECT STATEMENT              |      |      0 |        |      0 |00:00:00.01 |       0 |
|   1 | TABLE ACCESS BY INDEX ROWID | C    |      1 |      1 |    100 |00:00:00.01 |      11 |
|   2 |   NESTED LOOPS                |      |      1 |      1 |    102 |00:00:00.01 |       7 |
|   3 |    TABLE ACCESS BY INDEX ROWID| P    |      1 |      1 |      1 |00:00:00.01 |       4 |
|* 4 |     INDEX RANGE SCAN          | P_ID |      1 |      1 |      1 |00:00:00.01 |       3 |
|* 5 |    INDEX RANGE SCAN           | C_ID |      1 |      1 |    100 |00:00:00.01 |       3 |
Predicate Information (identified by operation id):
   4 - access("P"."ID"=10)
   5 - access("C"."ID"=10)
24 rows selected.
SQL> drop table p purge ;
Table dropped.
SQL> drop table c purge ;
Table dropped.
SQL> spool offEdited by: user503699 on Jan 18, 2012 11:49 PM

How to create a transport request with query and only with its structure.

HI guru,
how to create a transport request with query and only with its structure.transport request should not include any other query items like ( variables, conditions...etc)
thanks in advance.
venkata

Hi,
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anil

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null

One thing I forgot to mention: If you're an 8i client, then in
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Pierre
Oracle Product Development Team wrote:
: Hi,
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: If you're a 7.3 client, that's about all you can do. The Fix
was
: introduced in 8.0, where new structured types (ADT's) and new
: table types (VARRAY's and Nested tables) were introduced. So
if
: you're an 8.0 client, your 'wrapper' package could use an ADT
: which has the same attributes as the record, rather than
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showed
: above.
: Hope this helps!
: Pierre
: Thomas Richardson (guest) wrote:
: : Has anyone used sqlj to to call procedures with records and
: : tables as IN, OUT, or INOUT as parameters? If so how do you
: : assign values to the IN parameter in the record/tables, and
get
: : values out of the record/table when it is passed back? Might
: : anyone have any syntax?
: Oracle Technology Network
: http://technet.oracle.com
Oracle Technology Network
http://technet.oracle.com
null

Sending Email with Query Result (Table Format)

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Hi Experts,
what is the difference between
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Nice question. I also tried to find out, but no much success. My opinion is that for practical purposes there is no difference.
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Solved!
Go to Solution.

Here is the possible scenario:
Your router was configured correctly, and all was working well.
Thunderstorms knocked out power, and your router reverted to it's original setting ("automatic channel selection").
Now you have intermittent connectivity due to the change in configuration.
When you go into your router to change the channel, check to see if there is an option to "keep current channel settings after power cycle". If so, check that box.
Brian K
Verizon Telecom
Fiber Solution Center
Notice: Content posted by Verizon employees is meant to be informational and does not supercede or change the Verizon Forums User Guidelines or Terms or Service, or your Customer Agreement Terms and Conditions or Plan.

Can Exchange work correctly with routing and remote access?

tx in advance

Tx for answer !
Yes. I have suppose that if remote and routing access and Exchange are built-in win sbs11 mean that work together, did i'm wrong?
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tx again

Would you tell me If window server installed with "routing and remote access" can output firewall logs.

I install "routing and remote access" into Window Server and make it work as a firewall.
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Hi Kohenro31,
I'm a little confused about configuring RRAS to work as firewall, cause we usually deploy RRAS as VPN connection, router etc, would you please post more information in detail?
Routing and Remote Access Service：
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In addition, to view firewall event logs please check this article:
Viewing Firewall and IPsec Events in Event Viewer:
http://technet.microsoft.com/en-us/library/ff428140(v=WS.10).aspx
To enable RRAS logs, please check this article:
Enabling logs for RRAS:
http://blogs.technet.com/b/rrasblog/archive/2005/12/22/enabling-logs-for-rras.aspx
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Best Regards,
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Problem with dg4msql and table-valued functions

Have configured dg4msql to connect from my oracle db to ms sql server.
Am able to do simple SELECTs from ms sql tables like:
select * from "sys"."procedures"@dg4msql;
or
select * from "dbo"."SomeTable"@dg4msql;
But am unable to do a SELECT from a table-valued function:
select * from "dbo"."GetData"@dg4msql('param1value');
or
select * from "dbo"."GetData"('param1value')@dg4msql;
In both cases I get:
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It does not like the parameters portion of the query ("('param1value')")
initdg4msql.ora:
HS_FDS_CONNECT_INFO=[svr1]//mydb
HS_FDS_TRACE_LEVEL=OFF
HS_FDS_PROC_IS_FUNCT=TRUE
HS_FDS_RESULTSET_SUPPORT=TRUE
Have tried the other set of params:
HS_FDS_PROC_IS_FUNCT=FALSE
HS_FDS_RESULTSET_SUPPORT=TRUE
Same story. After changing the init*** file have bounced both Listeners (DB and Gateway), reconnected, and re-run the query.
Have I missed something?
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Sorry, but for me it looks you did not get the problem.
Oracle® Database Gateway for SQL Server User's Guide,:
11g Release 2 (11.2)
Part Number E12069-02
*2 SQL Server Gateway Features and Restriction*
Result Sets and Stored Procedures
The Oracle Database Gateway for SQL Server provides support for stored procedures which return result sets.
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PL/SQL Program Fetching from Result Sets in Sequential Mode
-- Execute procedure
out_arg := null;
refcurproc@MSQL('Hello World', out_arg, rc1);
Somewhere in this forum I've seen a message that the syntax "SELECT ... FROM sp@db(param1, param2)" works.
Anyway, even with the PL/SQL block the error message is the same - ORA-00933 "SQL command not properly ended"
and the cursor (* in SQL*PLUS) is put just at the first bracket.
Edited by: user636213 on Aug 10, 2012 5:17 AM

With query and table access

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