Can the format of a SQL Statement modify the execution time of an SQL ....

Can the format of a SQL Statement modify the execution time of an SQL statement?
Thanks in advance

It depends on:
1) What oracle version are you using
2) What do you mean for "format"
For example: if you're on Oracle9i and changing format means changing the order of the tables in the FROM clause and you're using Rule Based Optimizer then the execution plan and the execution time can be very different...
Max
[My Italian Oracle blog|http://oracleitalia.wordpress.com/2009/12/29/estrarre-i-dati-in-formato-xml-da-sql/]

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http://www.freeimagehosting.net/uploads/cf214afcf1.jpg
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Rakesh************************** Here is my tuning request **************************
1.) The following SQL statement has been identified to perform poorly. It currently takes up to 12 seconds to execute, but it's supposed to take a second at most.
This is the statement:
select DISTINCT trunc(c.sst_post_date) as post_date
from ac_t_sessn b , ac_t_ssntr c
where
       b.ses_status = 0
          and b.ses_profit_center = c.sst_profit_center
          and b.ses_acct_year = c.sst_acct_year
          and b.ses_acct_period = c.sst_acct_period
          and b.ses_sessn_no = c.sst_sessn_no
   AND
         C.sst_post_mtd||C.sst_post_TYPE IN
       (SELECT Y.pst_post_mtd||Y.pst_post_type
        FROM ac_r_post_functions Y
       WHERE Y.pst_post_status IN (0,'2'))
order by trunc(c.sst_post_date);It should return data from a table in a specific order.
2.) The version of the database is Oracle9i Enterprise Edition Release *9.2.0.6.0*
3.) These are the parameters relevant to the optimizer:
UAT_UML@umltest>show parameter optimizer
NAME                                 TYPE        VALUE
optimizer_dynamic_sampling           integer     1
optimizer_features_enable            string      9.2.0
optimizer_index_caching              integer     0
optimizer_index_cost_adj             integer     100
optimizer_max_permutations           integer     2000
optimizer_mode                       string      CHOOSE
UAT_UML@umltest>show parameter db_file_multi
NAME                                 TYPE        VALUE
db_file_multiblock_read_count        integer     16
UAT_UML@umltest>show parameter db_block_size
NAME                                 TYPE        VALUE
db_block_size                        integer     8192
UAT_UML@umltest>show parameter cursor_sharing
NAME                                 TYPE        VALUE
cursor_sharing                       string      EXACT
UAT_UML@umltest>column sname format a20
UAT_UML@umltest>column pname format a20
UAT_UML@umltest>column pval2 format a20
UAT_UML@umltest>select
2             sname
3           , pname
4           , pval1
5           , pval2
6      from
7           sys.aux_stats$;
no rows selected4.) Here is the output of EXPLAIN PLAN:
UAT_UML@umltest>select * from table(dbms_xplan.display);
PLAN_TABLE_OUTPUT
| Id | Operation              | Name                | Rows | Bytes |TempSpc| Cost |
|   0 | SELECT STATEMENT       |                      |   454 | 22700 |       | 5391 |
|   1 | SORT UNIQUE           |                      |   454 | 22700 |       | 5072 |
|   2 |   HASH JOIN            |                      | 69384 | 3387K| 2592K| 4478 |
|   3 |    INDEX FAST FULL SCAN| INDX_AC_T_SESSN      |   110K| 1294K|       |   244 |
|   4 |    HASH JOIN           |                      |   416K|    15M|       | 3877 |
|   5 |     TABLE ACCESS FULL | AC_R_POST_FUNCTIONS |    23 |   253 |       |     2 |
|   6 |     TABLE ACCESS FULL | AC_T_SSNTR           | 1790K|    46M|       | 3866 |
Note: cpu costing is off, PLAN_TABLE' is old version5.) Here is the output of SQL*Plus AUTOTRACE including the TIMING information:
UAT_UML@umltest>set autotrace traceonly arraysize 100
UAT_UML@umltest>
UAT_UML@umltest>select DISTINCT trunc(c.sst_post_date) as post_date
2 from ac_t_sessn b , ac_t_ssntr c
3 where
4 b.ses_status = 0
5 and b.ses_profit_center = c.sst_profit_center
6 and b.ses_acct_year = c.sst_acct_year
7 and b.ses_acct_period = c.sst_acct_period
8 and b.ses_sessn_no = c.sst_sessn_no
9 AND
10 C.sst_post_mtd||C.sst_post_TYPE IN (SELECT         Y.pst_post_mtd||Y.pst_post_type FROM ac_r_po
st_functions Y
11 WHERE Y.pst_post_status IN (0,'2'))
12 order by trunc(c.sst_post_date);
Execution Plan
   0      SELECT STATEMENT Optimizer=CHOOSE (Cost=5391 Card=454 Bytes=
          22700)
   1    0   SORT (UNIQUE) (Cost=5072 Card=454 Bytes=22700)
   2    1     HASH JOIN (Cost=4478 Card=69384 Bytes=3469200)
   3    2       INDEX (FAST FULL SCAN) OF 'INDX_AC_T_SESSN' (NON-UNIQU
          E) (Cost=244 Card=110433 Bytes=1325196)
   4    2       HASH JOIN (Cost=3877 Card=416304 Bytes=15819552)
   5    4         TABLE ACCESS (FULL) OF 'AC_R_POST_FUNCTIONS' (Cost=2
           Card=23 Bytes=253)
   6    4         TABLE ACCESS (FULL) OF 'AC_T_SSNTR' (Cost=3866 Card=
          1790555 Bytes=48344985)
Statistics
          0 recursive calls
          0 db block gets
      42741 consistent gets
        171 physical reads
          0 redo size
        425 bytes sent via SQL*Net to client
        507 bytes received via SQL*Net from client
          2 SQL*Net roundtrips to/from client
          1 sorts (memory)
          0 sorts (disk)
          2 rows processed
UAT_UML@umltest>DISCONNECT
Disconnected from Oracle9i Enterprise Edition Release 9.2.0.6.0 - Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.6.0 - Production6.) The TKPROF output snippet
TKPROF: Release 11.2.0.1.0 - Development on Wed Oct 27 12:47:35 2010
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
Trace file: umltest_ora_1604.trc
Sort options: prsela exeela fchela
count    = number of times OCI procedure was executed
cpu      = cpu time in seconds executing
elapsed = elapsed time in seconds executing
disk     = number of physical reads of buffers from disk
query    = number of buffers gotten for consistent read
current = number of buffers gotten in current mode (usually for update)
rows     = number of rows processed by the fetch or execute call
select DISTINCT trunc(c.sst_post_date) as post_date
from ac_t_sessn b , ac_t_ssntr c
where
b.ses_status = 0
and b.ses_profit_center = c.sst_profit_center
and b.ses_acct_year = c.sst_acct_year
and b.ses_acct_period = c.sst_acct_period
and b.ses_sessn_no = c.sst_sessn_no
AND
C.sst_post_mtd||C.sst_post_TYPE IN (SELECT         Y.pst_post_mtd||Y.pst_post_type FROM ac_r_post_functions Y
WHERE Y.pst_post_status IN (0,'2'))
order by trunc(c.sst_post_date)
call     count       cpu    elapsed       disk      query    current        rows
Parse        1      0.01       0.00          0          0          0           0
Execute      1      0.00       0.00          0          0          0           0
Fetch        2      3.20       4.38        171      42741          0           2
total        4      3.21       4.39        171      42741          0           2
Misses in library cache during parse: 1
Optimizer mode: CHOOSE
Parsing user id: 445
Rows     Row Source Operation
      2 SORT UNIQUE
     24   HASH JOIN
     11    INDEX FAST FULL SCAN OBJ#(62817) (object id 62817)
2293715    HASH JOIN
     31     TABLE ACCESS FULL OBJ#(67305)
1790555     TABLE ACCESS FULL OBJ#(62828)
alter session set sql_trace true
call     count       cpu    elapsed       disk      query    current        rows
Parse        0      0.00       0.00          0          0          0           0
Execute      1      0.00       0.00          0          0          0           0
Fetch        0      0.00       0.00          0          0          0           0
total        1      0.00       0.00          0          0          0           0
Misses in library cache during parse: 0
Misses in library cache during execute: 1
Optimizer mode: CHOOSE
Parsing user id: 445
OVERALL TOTALS FOR ALL NON-RECURSIVE STATEMENTS
call     count       cpu    elapsed       disk      query    current        rows
Parse        1      0.01       0.00          0          0          0           0
Execute      2      0.00       0.00          0          0          0           0
Fetch        2      3.20       4.38        171      42741          0           2
total        5      3.21       4.39        171      42741          0           2
Misses in library cache during parse: 1
Misses in library cache during execute: 1
OVERALL TOTALS FOR ALL RECURSIVE STATEMENTS
call     count       cpu    elapsed       disk      query    current        rows
Parse        0      0.00       0.00          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        0      0.00       0.00          0          0          0           0
Misses in library cache during parse: 0
    2 user SQL statements in session.
    0 internal SQL statements in session.
    2 SQL statements in session.
Trace file: umltest_ora_1604.trc
Trace file compatibility: 9.02.00
Sort options: prsela exeela fchela
       1 session in tracefile.
       2 user SQL statements in trace file.
       0 internal SQL statements in trace file.
       2 SQL statements in trace file.
       2 unique SQL statements in trace file.
      51 lines in trace file.
      10 elapsed seconds in trace file. Any help would be greatly appreciated?

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The following changes in the code will make the user to give the input
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public class db_testing {
static final String DRIVER = "com.mysql.jdbc.Driver";
static final String DATABASE_URL = "jdbc:mysql://localhost/S204111933";
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rset=pstmt.executeQuery();
ResultSetMetaData metadata=rset.getMetaData();
System.out.println("The begining: ");
for(int i=1;i<=metadata.getColumnCount();i++)
System.out.print(metadata.getColumnName(i)+"\t");
System.out.println();
System.out.println();
while(rset.next()){
for(int i=1;i<=metadata.getColumnCount();i++)
System.out.print(rset.getObject(i)+"\t\t");
System.out.println();}
catch(Exception e){
e.printStackTrace();
finally{
try{
cn.close();
st.close();
rset.close();
catch(Exception e1){
e1.printStackTrace();
}

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Can the format of a SQL Statement modify the execution time of an SQL ....

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