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

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inLV.onLoad = function(success) {
if (success) {
//sets dynamic text box to show variable sent from php
statusTxt.text = phpmess;
} else {
statusTxt.text = "No Data Received";
This works ok and the inLV.onLoad function reports that it is receiving data but does not display the variable received from PHP. The PHP file is like this:
<?php
$mytxt =$_POST['hsdata'];
$myfile = "test23.txt";
$fh = fopen($myfile,'w');
//adds data to file
fwrite($fh, $mytxt);
//closes file
fclose ($fh);
$mess = "hello there from php";
echo ("&phpmess=$mess&");
?>
The PHP file is correctly receiving the hsdata from flash and writing it to a text file, but there seems to be a problem with the final part of the code which is intended to send a variable called 'phpmess' back to Flash, this is the string "hello there from php". How do I set up Flash and PHP so that PHP can send a variable back to Flash using echo? Really have tried everything but am totally baffled. Online tutorials have given numerous different syntax configurations for how the PHP file should be written which has really confused me - any help would be greatly appreciated.

Simple test case with NL and table order .

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