Query ON ORACLE AND OAS UPGRADE PLAN

Currently we are running Oracle Server 7.3.4 Under Unix (SunOS5.7) with access to a Sybase 12.5.0.1 via Oracle-Sybase Transparent Gateway 4.1.1.0.0.
For the web services, we use OAS 4.0.8.1. Our web applications are based on Javascript and Oracle PL/SQL to generate HTML.
We plan to upgrade the Oracle Server from 7.3.4 to Oracle 9iAS version 9.2.0.1.
Our quetions are :
1) Is it necessary to upgrade OAS 4.0.8.1 to Oracle 9iAS?
1a)If we have to upgrade then which version of 9iAS (9.0.2, 9.0.3, 9.0.4)is compatible?
1b)what change, if any, do we have to make to our exisiting applications(Javascript, HTML and PL/SQL-generated HTML) (we understand that the application logic would not have to be change in any
way. Is this so?)
2) Are Oracle Server 9i and Oracle 9iAS Application Server compatible with the SunOS5.7 Unix or is an upgrade to a later version necessary?
3) Do we need to upgrade the Oracle-Sybase Transparent Gateway if we upgrade the Oracle Server to Oracle9i and if so, to what version?
Please confirm that Oracle9.2 has a Gateway to Sybase 12.5.0.1 that will support the features of 7.3.4 gateway (i.e it is downward compatible to 7.3.4
gateway).

Not real sure if this is doable or would help, but perhaps you can load the access table into an Oracle Global Temporary Table? See http://www.oracle-base.com/articles/8i/TemporaryTables.php (and google on it). I think I'm assuming your 11 hour query had something to do with shovelling a bucketload of data to the access side, perhaps if you could show us the plan on the Oracle side that access was generating to get the Oracle data there might be a different answer.
Oftentimes cross-db tools won't use Oracle features like analytics, or do slow-by-slow row processing where a short procedure could do things within the Oracle sql engine and return data in larger arrays.
Sometimes mass data cleansings benefit from using server side tools outside of the db. Do you have the data from before it was loaded to Oracle? What Oracle platform are you on?

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How to find out the date when an oracle database is upgraded

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user13312943 wrote:
Hi Ed and SB,
Thanks for your replies. How about this option?
Let us assume I am interested in checking when my database is upgraded to any 11g version.
Will this query help?
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I understand this may not be a generic solution , but with this idea I may be able to build up a query to get the result.
Thanks,
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Same Query returning different result (Different execution plan)

Hi all,
To day i have discovered a strange thing: a query that return a different result when using a different execution plan.
The query :
SELECT *
FROM schema.table@database a
WHERE     column1 IN ('3')
       AND column2 = '101'
       AND EXISTS
              (SELECT null
                 FROM schema.table2 c
                WHERE a.column3 = SUBSTR (c.column1, 2, 12));where schema.table@database is a remote table.
when executed with the hint /*+ ordered use_nl(a c) */ these query return no result and its execution plan is :
Rows     Row Source Operation
      0 NESTED LOOPS (cr=31 r=0 w=0 time=4894659 us)
   4323   SORT UNIQUE (cr=31 r=0 w=0 time=50835 us)
   4336    TABLE ACCESS FULL TABLE2 (cr=31 r=0 w=0 time=7607 us)
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22556   REMOTE (cr=0 r=0 w=0 time=401176 us)
   4336   TABLE ACCESS FULL TABLE2 (cr=35 r=0 w=0 time=7709 us)It seem that when the execution plan have changed the remote query return no result.
It'is a bug or i have missed somthing ?
PS: The two table are no subject to insert or update statement.
Oracle version : 9.2.0.2.0
System version : HP-UX v1
Thanks.

H.Mahmoud wrote:
Oracle version : 9.2.0.2.0
System version : HP-UX v1Hard to say. You're using a very old and deprecated version of the database, and one that was known to contain bugs.
9.2.0.7 was really the lowest version of 9i that was considered to be 'stable', but even so, it's old and lacking in many ways.
Consider upgrading to the latest database version at your earliest opportunity. (or at least apply patches up to the latest 9i version before querying if there is bugs in your really low buggy version)

SQL Query takes 7 hours after upgrade to 10g

the following query executes in under a minute in 9i, however once upgraded to 10g it takes 7 hours. The query is designed to select the data row with the max date value for the selected criteria (there are multiple rows that match the below criteria with different dates)
I have tested in a lower environment the setting of "_optimizer_cost_based_transformation"=off and this corrects the problem. I do not feel comfortable setting this parameter session or system wide to provide a solution
We are running Oracle 10gR2 on Solaris
select "INSTN_ID_N",
"MEAS_D",
"FEED_TYPE_C",
"FREQ_C",
"STAT_LVL_C",
"TS_D",
"IX_INSTN_ID_C",
"ENTI_TYPE_C",
"CNTXT_ID_C",
"CNTXT_C",
"IX_CNTXT_ID_C",
"VND_C",
"PRCS_C",
"USR_ID_C",
"STAT_C",
"OVRD_RSN_C",
"LD_DT_D",
"UPD_USR_C",
"UPD_TS_D",
"INS_USR_C",
"INS_TS_D",
"DEL_FLG_C"
from IDA.V_INSTANCE_STATUS M
where
TS_D =
select max (TS_D) from IDA.V_INSTANCE_STATUS
where
INSTN_ID_N = M.INSTN_ID_N AND
MEAS_D = M.MEAS_D AND
FEED_TYPE_C = M.FEED_TYPE_C AND
FREQ_C = M.FREQ_C AND
STAT_LVL_C = M.STAT_LVL_C AND
IX_INSTN_ID_C = M.IX_INSTN_ID_C
)

user638113 wrote:
the following query executes in under a minute in 9i, however once upgraded to 10g it takes 7 hours. The query is designed to select the data row with the max date value for the selected criteria (there are multiple rows that match the below criteria with different dates)
I have tested in a lower environment the setting of "_optimizer_cost_based_transformation"=off and this corrects the problem. I do not feel comfortable setting this parameter session or system wide to provide a solutionIf you're sure that the "lower" environment reproduces the same issue, and not due to some other differences (different statistics, parameters etc.), then you could share the two different execution plans generated via DBMS_XPLAN.DISPLAY having the cost based transformations turned on and off. Make sure you use the \ tags before and after the plan output to format it in fixed font. You can use the "Quote" button in the message editor to see how to use the tag.
Furthermore a optimizer trace (10053) might reveal why the cost based transformations lead to such an result.
Regards,
Randolf
Oracle related stuff blog:
http://oracle-randolf.blogspot.com/
SQLTools++ for Oracle (Open source Oracle GUI for Windows):
http://www.sqltools-plusplus.org:7676/
http://sourceforge.net/projects/sqlt-pp/

Fast query in Oracle 10 but slow in Oracle 11

Hello all,
We have a query that is running smooth in Oracle 10g. It takes less then a second. We have setup a second server and used export/import to create the same database on 11g. On this 11g database the query takes a lot of time (like 8s or more).
Below are the details. Maybe somebody can point us to the reason why this happens.
We are talking about this statement :
Select nvl(sum(BM_OPENST_D - BM_OPENST_CR),0)
from bh.bh123gh
where
F123_AR_NR>='4400000000' and
F123_AR_NR<='4404000000' and
F123_KL_LEV_AR_NR='0631001000' and
SRT_REK=2 and
F123_BKJR>=0000 and
F123_BKJR<=2011 and
F123_FIRMA=2;Database version is 11.2.0.1.0
SQL>
SQL> show parameter optimizer
NAME                                 TYPE        VALUE
optimizer_capture_sql_plan_baselines boolean     FALSE
optimizer_dynamic_sampling           integer     2
optimizer_features_enable            string      11.2.0.1
optimizer_index_caching              integer     0
optimizer_index_cost_adj             integer     100
optimizer_mode                       string      ALL_ROWS
optimizer_secure_view_merging        boolean     TRUE
optimizer_use_invisible_indexes      boolean     FALSE
optimizer_use_pending_statistics     boolean     FALSE
optimizer_use_sql_plan_baselines     boolean     TRUE
SQL>
SQL> show parameter db_file_multi
NAME                                 TYPE        VALUE
db_file_multiblock_read_count        integer     6
SQL>
SQL> show parameter db_block_size
NAME                                 TYPE        VALUE
db_block_size                        integer     8192
SQL>
SQL> show parameter cursor_sharing
NAME                                 TYPE        VALUE
cursor_sharing                       string      EXACT
SQL>
SQL> column sname format a20
SQL> column pname format a20
SQL> column pval2 format a20
SQL>
SQL> select         sname
2             , pname
3             , pval1
4             , pval2
5 from
6             sys.aux_stats$;
SNAME                PNAME                     PVAL1 PVAL2
SYSSTATS_INFO        STATUS                          COMPLETED
SYSSTATS_INFO        DSTART                          03-30-2010 11:05
SYSSTATS_INFO        DSTOP                           03-30-2010 11:05
SYSSTATS_INFO        FLAGS                         1
SYSSTATS_MAIN        CPUSPEEDNW           1183.90219
SYSSTATS_MAIN        IOSEEKTIM                    10
SYSSTATS_MAIN        IOTFRSPEED                 4096
SYSSTATS_MAIN        SREADTIM
SYSSTATS_MAIN        MREADTIM
SYSSTATS_MAIN        CPUSPEED
SYSSTATS_MAIN        MBRC
SYSSTATS_MAIN        MAXTHR
SYSSTATS_MAIN        SLAVETHR
13 rows selected.
Elapsed: 00:00:00.03
SQL>
SQL> explain plan for
2 Select nvl(sum(BM_OPENST_DEB - BM_OPENST_CR),0)
3 from bh.bh123gh
4 where
5 F123_AR_NR>='4400000000' and
6 F123_AR_NR<='4404000000' and
7 F123_KL_LEV_AR_NR='0631001000' and
8 SRT_REK=2 and
9 F123_BKJR>=0000 and
10 F123_BKJR<=2011 and
11 F123_FIRMA=2;
Explained.
Elapsed: 00:00:00.10
SQL>
SQL> select * from table(dbms_xplan.display);
PLAN_TABLE_OUTPUT
Plan hash value: 3488495774
| Id | Operation                    | Name             | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT             |                  |     1 |    38 | 1792   (1)| 00:00:22 |
|   1 | SORT AGGREGATE              |                  |     1 |    38 |            |          |
|* 2 |   TABLE ACCESS BY INDEX ROWID| BH123GH          | 5059 |   187K| 1792   (1)| 00:00:22 |
|* 3 |    INDEX RANGE SCAN          | I_BH123GH_ISABEL | 5059 |       |   145   (0)| 00:00:02 |
Predicate Information (identified by operation id):
   2 - filter("F123_BKJR">=0000 AND "F123_BKJR"<=2011)
   3 - access("F123_FIRMA"=2 AND "SRT_REK"=2 AND "F123_KL_LEV_AR_NR"='0631001000'
              AND "F123_AR_NR">='4400000000' AND "F123_AR_NR"<='4404000000')
       filter("F123_AR_NR"<='4404000000' AND "F123_AR_NR">='4400000000')
18 rows selected.
Elapsed: 00:00:00.20
SQL>
SQL> rollback;
Rollback complete.
Elapsed: 00:00:00.01
SQL>
SQL> rem Set the ARRAYSIZE according to your application
SQL> set autotrace traceonly arraysize 100
SQL>
SQL> alter session set tracefile_identifier = 'mytrace1';
Session altered.
Elapsed: 00:00:00.01
SQL>
SQL> rem if you're using bind variables
SQL> rem define them here
SQL>
SQL> rem variable b_var1 number
SQL> rem variable b_var2 varchar2(20)
SQL>
SQL> rem and initialize them
SQL>
SQL> rem exec :b_var1 := 1
SQL> rem exec :b_var2 := 'DIAG'
SQL>
SQL> alter session set events '10046 trace name context forever, level 8';
Session altered.
Elapsed: 00:00:00.03
SQL>
SQL> -- put your statement here
SQL> Select nvl(sum(BM_OPENST_D - BM_OPENST_CR),0)
2 from bh.bh123gh
3 where
4 F123_AR_NR>='4400000000' and
5 F123_AR_NR<='4404000000' and
6 F123_KL_LEV_AR_NR='0631001000' and
7 SRT_REK=2 and
8 F123_BKJR>=0000 and
9 F123_BKJR<=2011 and
10 F123_FIRMA=2;
Elapsed: 00:00:09.92
Execution Plan
Plan hash value: 3488495774
| Id | Operation                    | Name             | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT             |                  |     1 |    38 | 1792   (1)| 00:00:22 |
|   1 | SORT AGGREGATE              |                  |     1 |    38 |            |          |
|* 2 |   TABLE ACCESS BY INDEX ROWID| BH123GH          | 5059 |   187K| 1792   (1)| 00:00:22 |
|* 3 |    INDEX RANGE SCAN          | I_BH123GH_ISABEL | 5059 |       |   145   (0)| 00:00:02 |
Predicate Information (identified by operation id):
   2 - filter("F123_BKJR">=0000 AND "F123_BKJR"<=2011)
   3 - access("F123_FIRMA"=2 AND "SRT_REK"=2 AND "F123_KL_LEV_AR_NR"='0631001000'
              AND "F123_AR_NR">='4400000000' AND "F123_AR_NR"<='4404000000')
       filter("F123_AR_NR"<='4404000000' AND "F123_AR_NR">='4400000000')
Statistics
          1 recursive calls
          0 db block gets
      11104 consistent gets
       9434 physical reads
          0 redo size
        574 bytes sent via SQL*Net to client
        519 bytes received via SQL*Net from client
          2 SQL*Net roundtrips to/from client
          0 sorts (memory)
          0 sorts (disk)
          1 rows processed
SQL>
SQL> disconnect
Disconnected from Oracle Database 11g Release 11.2.0.1.0 - 64bit Production
SQL>
SQL> spool offTrace output :
TKPROF: Release 11.2.0.1.0 - Development on Tue Nov 22 13:58:33 2011
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
Trace file: C:\Oracle\diag\rdbms\oravopak\oravopak\trace\oravopak_ora_7352_mytrace1.trc
Sort options: default
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 nvl(sum(BM_OPENST_D - BM_OPENST_CR),0)
from bh.bh123gh
where
F123_AR_NR>='4400000000' and
F123_AR_NR<='4404000000' and
F123_KL_LEV_AR_NR='0631001000' and
SRT_REK=2 and
F123_BKJR>=0000 and
F123_BKJR<=2011 and
F123_FIRMA=2
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      0.03       9.86       9434      11104          0           1
total        4      0.04       9.87       9434      11104          0           1
Misses in library cache during parse: 1
Optimizer mode: ALL_ROWS
Parsing user id: SYS
Rows     Row Source Operation
      1 SORT AGGREGATE (cr=11104 pr=9434 pw=0 time=0 us)
67250   TABLE ACCESS BY INDEX ROWID BH123GH (cr=11104 pr=9434 pw=0 time=10500177 us cost=1792 size=192242 card=5059)
67250    INDEX RANGE SCAN I_BH123GH_ISABEL (cr=526 pr=550 pw=0 time=44363 us cost=145 size=0 card=5059)(object id 75061)
Elapsed times include waiting on following events:
Event waited on                             Times   Max. Wait Total Waited
----------------------------------------   Waited ---------- ------------
SQL*Net message to client                       2        0.00          0.00
Disk file operations I/O                        1        0.00          0.00
db file sequential read                      8893        0.10          9.26
db file scattered read                          7        0.01          0.05
db file parallel read                           1        0.02          0.02
SQL*Net message from client                     2        0.00          0.00
********************************************************************************DBMS_XPLAN.DISPLAY_CURSOR output :
SQL>
SQL> select * from table(dbms_xplan.display_cursor(null, null, 'ALLSTATS LAST'));
PLAN_TABLE_OUTPUT
SQL_ID g6pkv639sdfgw, child number 0
Select /*+ gather_plan_statistics */ nvl(sum(BM_OPENST_DEB -
BM_OPENST_CR),0) from bh.bh123gh where F123_AR_NR>='4400000000'
and F123_AR_NR<='4404000000' and F123_KL_LEV_AR_NR='0631001000' and
SRT_REK=2 and F123_BKJR>=0000 and F123_BKJR<=2011 and
F123_FIRMA=2
Plan hash value: 3488495774
| Id | Operation                    | Name             | Starts | E-Rows | A-Rows |   A-Time   | Buffers | Reads |
|   0 | SELECT STATEMENT             |                  |      1 |        |      1 |00:00:08.07 |   11104 | 13531 |
|   1 | SORT AGGREGATE              |                  |      1 |      1 |      1 |00:00:08.07 |   11104 | 13531 |
|* 2 |   TABLE ACCESS BY INDEX ROWID| BH123GH          |      1 |   5059 | 67250 |00:00:10.90 |   11104 | 13531 |
|* 3 |    INDEX RANGE SCAN          | I_BH123GH_ISABEL |      1 |   5059 | 67250 |00:00:00.05 |     526 |    550 |
Predicate Information (identified by operation id):
   2 - filter(("F123_BKJR">=0 AND "F123_BKJR"<=2011))
   3 - access("F123_FIRMA"=2 AND "SRT_REK"=2 AND "F123_KL_LEV_AR_NR"='0631001000' AND
              "F123_AR_NR">='4400000000' AND "F123_AR_NR"<='4404000000')
       filter(("F123_AR_NR"<='4404000000' AND "F123_AR_NR">='4400000000'))
27 rows selected.
Elapsed: 00:00:01.15
SQL>
SQL> spool off

I still find that my Oracle 10 DB is a tad faster.
Comparing the plans shows that my Oracle 10 DB does less physical reads. I think I will get the same speed if I can find a way to change that behaviour on my Oracle 11 DB or can find the reason why it does that.
SQL>
SQL> show parameter user_dump_dest
NAME                                 TYPE        VALUE
user_dump_dest                       string      C:\ORACLE\PRODUCT\10.2.0\ADMIN
                                                 \ORAMULT\UDUMP
SQL>
SQL> show parameter optimizer
NAME                                 TYPE        VALUE
optimizer_dynamic_sampling           integer     2
optimizer_features_enable            string      10.2.0.3
optimizer_index_caching              integer     0
optimizer_index_cost_adj             integer     100
optimizer_mode                       string      ALL_ROWS
optimizer_secure_view_merging        boolean     TRUE
SQL>
SQL> show parameter db_file_multi
NAME                                 TYPE        VALUE
db_file_multiblock_read_count        integer     16
SQL>
SQL> show parameter db_block_size
NAME                                 TYPE        VALUE
db_block_size                        integer     8192
SQL>
SQL> show parameter cursor_sharing
NAME                                 TYPE        VALUE
cursor_sharing                       string      EXACT
SQL>
SQL> column sname format a20
SQL> column pname format a20
SQL> column pval2 format a20
SQL>
SQL> select         sname
2             , pname
3             , pval1
4             , pval2
5 from
6             sys.aux_stats$;
SNAME                PNAME                     PVAL1 PVAL2
SYSSTATS_INFO        STATUS                          COMPLETED
SYSSTATS_INFO        DSTART                          04-17-2007 04:50
SYSSTATS_INFO        DSTOP                           04-17-2007 04:50
SYSSTATS_INFO        FLAGS                         1
SYSSTATS_MAIN        CPUSPEEDNW           470.445344
SYSSTATS_MAIN        IOSEEKTIM                    10
SYSSTATS_MAIN        IOTFRSPEED                 4096
SYSSTATS_MAIN        SREADTIM
SYSSTATS_MAIN        MREADTIM
SYSSTATS_MAIN        CPUSPEED
SYSSTATS_MAIN        MBRC
SYSSTATS_MAIN        MAXTHR
SYSSTATS_MAIN        SLAVETHR
13 rows selected.
Elapsed: 00:00:00.01
SQL>
SQL> explain plan for
2 Select nvl(sum(BM_OPENST_DEB- BM_OPENST_CR),0)
3 from bh.bh123gh
4 where
5 F123_AR_NR>='4400000000' and
6 F123_AR_NR<='4404000000' and
7 F123_KL_LEV_AR_NR='0631001000' and
8 SRT_REK=2 and
9 F123_BKJR>=0000 and
10 F123_BKJR<=2011 and
11 F123_FIRMA=2;
Explained.
Elapsed: 00:00:00.00
SQL>
SQL> select * from table(dbms_xplan.display);
PLAN_TABLE_OUTPUT
Plan hash value: 3488495774
| Id | Operation                    | Name             | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT             |                  |     1 |    38 | 1594   (1)| 00:00:20 |
|   1 | SORT AGGREGATE              |                  |     1 |    38 |            |          |
|* 2 |   TABLE ACCESS BY INDEX ROWID| BH123GH          | 4776 |   177K| 1594   (1)| 00:00:20 |
|* 3 |    INDEX RANGE SCAN          | I_BH123GH_ISABEL | 4776 |       |   140   (1)| 00:00:02 |
Predicate Information (identified by operation id):
   2 - filter("F123_BKJR">=0000 AND "F123_BKJR"<=2011)
   3 - access("F123_FIRMA"=2 AND "SRT_REK"=2 AND "F123_KL_LEV_AR_NR"='0631001000'
              AND "F123_AR_NR">='4400000000' AND "F123_AR_NR"<='4404000000')
       filter("F123_AR_NR"<='4404000000' AND "F123_AR_NR">='4400000000')
18 rows selected.
Elapsed: 00:00:00.32
SQL>
SQL> rollback;
Rollback complete.
Elapsed: 00:00:00.00
SQL>
SQL> rem Set the ARRAYSIZE according to your application
SQL> set autotrace traceonly arraysize 100
SQL>
SQL> alter session set tracefile_identifier = 'mytrace1';
Session altered.
Elapsed: 00:00:00.00
SQL>
SQL> rem if you're using bind variables
SQL> rem define them here
SQL>
SQL> rem variable b_var1 number
SQL> rem variable b_var2 varchar2(20)
SQL>
SQL> rem and initialize them
SQL>
SQL> rem exec :b_var1 := 1
SQL> rem exec :b_var2 := 'DIAG'
SQL>
SQL> alter session set events '10046 trace name context forever, level 8';
Session altered.
Elapsed: 00:00:00.00
SQL>
SQL> -- put your statement here
SQL> Select nvl(sum(BM_OPENST_DEB- BM_OPENST_CR),0)
2 from bh.bh123gh
3 where
4 F123_AR_NR>='4400000000' and
5 F123_AR_NR<='4404000000' and
6 F123_KL_LEV_AR_NR='0631001000' and
7 SRT_REK=2 and
8 F123_BKJR>=0000 and
9 F123_BKJR<=2011 and
10 F123_FIRMA=2;
Elapsed: 00:00:00.12
Execution Plan
Plan hash value: 3488495774
| Id | Operation                    | Name             | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT             |                  |     1 |    38 | 1594   (1)| 00:00:20 |
|   1 | SORT AGGREGATE              |                  |     1 |    38 |            |          |
|* 2 |   TABLE ACCESS BY INDEX ROWID| BH123GH          | 4776 |   177K| 1594   (1)| 00:00:20 |
|* 3 |    INDEX RANGE SCAN          | I_BH123GH_ISABEL | 4776 |       |   140   (1)| 00:00:02 |
Predicate Information (identified by operation id):
   2 - filter("F123_BKJR">=0000 AND "F123_BKJR"<=2011)
   3 - access("F123_FIRMA"=2 AND "SRT_REK"=2 AND "F123_KL_LEV_AR_NR"='0631001000'
              AND "F123_AR_NR">='4400000000' AND "F123_AR_NR"<='4404000000')
       filter("F123_AR_NR"<='4404000000' AND "F123_AR_NR">='4400000000')
Statistics
          1 recursive calls
          0 db block gets
      11001 consistent gets
          0 physical reads
          0 redo size
        459 bytes sent via SQL*Net to client
        396 bytes received via SQL*Net from client
          2 SQL*Net roundtrips to/from client
          0 sorts (memory)
          0 sorts (disk)
          1 rows processed
SQL>
SQL> disconnect
Disconnected from Oracle Database 10g Release 10.2.0.3.0 - Production
SQL>
SQL> spool off

Query from oracle to MySql using dblink fetch all the rows in MySql table

Hello,
I am using Heterogeneous connectivity between oracle 10204 to Mysql database.
I have a database link in the oracle side .
I am query a table in MySql that have 10 million rows.
Its doesnt matter if i am running :
select * from "CDR_Accounts"@mysql where "id"=7675405;
or
select * from "CDR_Accounts"@mysql ;
There is an index on the id column.
Yet, it seems that the Mysql is feteching all the rows from the table , all the data is transfering to oracle over the dblink , and only after that the requested rows are get back to the client.
The /etc/odbcinst.ini file is as follow:
[odbcprd:oracle@odbc /software/oracle]$ cat /etc/odbcinst.ini
[myodbc3]
Description             = Mysql connector to mysql version 3.5
Driver          = /software/oracle/MysqlOdbc/3.52/lib/libmyodbc3-3.51.25.so
Driver64                = /usr/lib
Setup           = /software/oracle/MysqlOdbc/3.52/lib/libmyodbc3S-3.51.25.so
Setup64         = /usr/lib
UsageCount              = 1
CPTimeout               = 3600
CPReuse         = Please advice
Thanks

When using a gateway it is always possible that a where clause is not sent to the remote database. This is called post processing and depends on several factors like the used ODBC driver, the columns and its data types but also if you specify certain functions in the where clause.
The fastest way to see if post processing happens is in Oracle 11g the explain plan for a query. In 10g the plan does not always match the statement sent to the foreign database. Here it would be better to enable gateway tracing and setting the trace level to ON. This will log the statements sent to the foreign database and you can compare what statement was sent with the statement you've tried to execute.

Wrong result for query with like and %

I have a strange problem with query with like and %.
When I run this script:
ALTER SESSION SET NLS_SORT = 'BINARY_CI';
ALTER SESSION SET NLS_COMP = 'LINGUISTIC';
-- SELECT * FROM NLS_SESSION_PARAMETERS;
-- drop table test1;
CREATE TABLE TEST1(K1 NVARCHAR2(80));
INSERT INTO TEST1 VALUES ('gsdk');
INSERT INTO TEST1 VALUES ('ąxyz');
INSERT INTO TEST1 VALUES ('ŁFa');
INSERT INTO TEST1 VALUES ('ła');
INSERT INTO TEST1 VALUES ('Śab');
INSERT INTO TEST1 VALUES ('Śrrrb');
commit;
select * from TEST1 where k1 like N'Ł%';
I get this:
K1
ŁFa
ła
Śab <- WRONG
Śrrrb <- WRONG
4 rows selected
When i change datatype to varchar2 this code work correct.
Is this a bug or what ?
The execution plan:
PLAN_TABLE_OUTPUT
SQL_ID d3d64aupz4bb5, child number 2
select * from TEST1 where k1 like N'Ł%'
Plan hash value: 4122059633
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | | | 2 (100)| |
|* 1 | TABLE ACCESS FULL| TEST1 | 1 | 82 | 2 (0)| 00:00:01 |
Predicate Information (identified by operation id):
1 - filter((NLSSORT("K1",'nls_sort=''BINARY_CI''')>=HEXTORAW('014200'
) AND NLSSORT("K1",'nls_sort=''BINARY_CI''')<HEXTORAW('01610100') ))
Note
- dynamic sampling used for this statement (level=2)

DATABASE NLS CONFIGURATION:
NLS_CHARACTERSET AL32UTF8
NLS_NCHAR_CHARACTERSET     AL16UTF16
NLS_COMP     BINARY
NLS_SORT     BINARY
Oracle version 11.2.0.2.0

Need complex query with joins and AGGREGATE functions.

Hello Everyone ;
Good Morning to all ;
I have 3 tables with 2 lakhs record. I need to check query performance.. How CBO rewrites my query in materialized view ?
I want to make complex join with AGGREGATE FUNCTION.
my table details
SQL> select from tab;*
TNAME TABTYPE CLUSTERID
DEPT TABLE
PAYROLL TABLE
EMP TABLE
SQL> desc emp
Name
EID
ENAME
EDOB
EGENDER
EQUAL
EGRADUATION
EDESIGNATION
ELEVEL
EDOMAIN_ID
EMOB_NO
SQL> desc dept
Name
EID
DNAME
DMANAGER
DCONTACT_NO
DPROJ_NAME
SQL> desc payroll
Name
EID
PF_NO
SAL_ACC_NO
SALARY
BONUS
I want to make complex query with joins and AGGREGATE functions.
Dept names are : IT , ITES , Accounts , Mgmt , Hr
GRADUATIONS are : Engineering , Arts , Accounts , business_applications
I want to select records who are working in IT and ITES and graduation should be "Engineering"
salary > 20000 and < = 22800 and bonus > 1000 and <= 1999 with count for males and females Separately ;
Please help me to make a such complex query with joins ..
Thanks in advance ..
Edited by: 969352 on May 25, 2013 11:34 AM

969352 wrote:
why do you avoid providing requested & NEEDED details?I do NOT understand what do you expect ?
My Goal is :
1. When executing my own query i need to check expalin plan.please proceed to do so
http://docs.oracle.com/cd/E11882_01/server.112/e26088/statements_9010.htm#SQLRF01601
2. IF i enable query rewrite option .. i want to check explain plan ( how optimizer rewrites my query ) ? please proceed to do so
http://docs.oracle.com/cd/E11882_01/server.112/e16638/ex_plan.htm#PFGRF009
3. My only aim is QUERY PERFORMANCE with QUERY REWRITE clause in materialized view.It is an admirable goal.
Best Wishes on your quest for performance improvements.

Query ON ORACLE AND OAS UPGRADE PLAN

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