Data automatically become null in Oracle 11g DB

We setup an Oracle 11g database for our application. Yesterday I have noted that in a table Contract_Owner the effective date for the owner FQYX1 is 30-Oct-12. But all of a sudden it has become NULL today. Im not sure how it has changed from 30-Oct-12 to NULL.
Any ideas/thoughts will be appreciated greatly ....
Edited by: 959598 on Apr 18, 2013 2:03 AM

Oracle wouldn't change a value to a NULL unless it is told to do so.
It could have been a user , a developer, a power user / super user.
It could have been application code.
It could have been a trigger.
It could have been a mistakenly-written update.
It could have been a scheduled job or a one-off job.
Hemant K Chitale

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Hi All,
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1 create table part
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We want to take export of the OND schema in production database and
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=================================================================
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=================================================================
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Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
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TEST01 TRIGGER VALID 3
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=================================================================
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=================================================================
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SQL*Plus: Release 11.2.0.2.0 Production on Mon Dec 3 18:40:16 2012
Copyright (c) 1982, 2010, Oracle. All rights reserved.
Enter user-name: /as sysdba
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Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
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NAME OPEN_MODE
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[oraodrmt@szoddb01]>
Import: Release 11.2.0.2.0 - Production on Mon Dec 3 19:42:47 2012
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
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Estimate in progress using BLOCKS method...
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
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Processing object type SCHEMA_EXPORT/USER
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Processing object type SCHEMA_EXPORT/SYSTEM_GRANT
Processing object type SCHEMA_EXPORT/ROLE_GRANT
Processing object type SCHEMA_EXPORT/DEFAULT_ROLE
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Processing object type SCHEMA_EXPORT/TABLE/TABLE
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[oraodrmt@szoddb01]>sqlplus
SQL*Plus: Release 11.2.0.2.0 Production on Mon Dec 3 19:46:04 2012
Copyright (c) 1982, 2010, Oracle. All rights reserved.
Enter user-name: /as sysdba
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
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TEST01 PROCEDURE          VALID 2
TEST01 TABLE               VALID 419
TEST01 SEQUENCE          VALID 3
TEST01 FUNCTION          VALID 8
TEST01 TRIGGER          VALID 3
TEST01 INDEX               VALID 545
TEST01 LOB               VALID 18
TEST01 DATABASE LINK          VALID 1
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SQL>
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SQL> col "Objects" format 999,999,999
SQL> select obj.owner "Owner"
2 , obj_cnt "Objects"
3 , decode(seg_size, NULL, 0, seg_size) "size MB"
4 from (select owner, count(*) obj_cnt from dba_objects group by owner) obj
5 , (select owner, ceil(sum(bytes)/1024/1024) seg_size
6 from dba_segments group by owner) seg
7 where obj.owner = seg.owner(+)
8 order by 3 desc ,2 desc, 1
9 /
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OND                8,065          247,529
SYS               9,554          6,507
TEST01               999          1,164
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=================================================================
STEP-3 FOR REMOVING THE DATABASE LINK
=================================================================
[oraodrmt@szoddb01]>sqlplus
SQL*Plus: Release 11.2.0.2.0 Production on Mon Dec 3 19:16:01 2012
Copyright (c) 1982, 2010, Oracle. All rights reserved.
Enter user-name: /as sysdba
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Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
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Could you please help me?
Regards
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BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
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union all
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pat1     varchar2(1000);
pat2     varchar2(1000);
va       number;
vc       sys_refcursor;
vs        varchar2(1000);
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select ksppstvl into pat1
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-- As to alert log file,
25000th execution
26000th execution
27000th execution
28000th execution
29000th execution
30000th execution
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1. Oracle invalidates the query when internal pga aggregate size changes, which is quite natural.
2. With changed pga aggregate size, Oracle recalculates the cost. These are excerpts from the both of the 10053 trace files.
-- First 10053 trace file
PARAMETERS USED BY THE OPTIMIZER
PARAMETERS WITH ALTERED VALUES
Compilation Environment Dump
_smm_max_size                       = 11468 KB
_smm_px_max_size                    = 28672 KB
optimizer_use_sql_plan_baselines    = false
optimizer_use_invisible_indexes     = true
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PARAMETERS USED BY THE OPTIMIZER
PARAMETERS WITH ALTERED VALUES
Compilation Environment Dump
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_smm_px_max_size                    = 32768 KB
optimizer_use_sql_plan_baselines    = false
optimizer_use_invisible_indexes     = true
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I just like to hear your opinions on this behavior.
Do you think that this is acceptable? Or is this another great feature that nobody wants to use like automatic tuning advisor?
================================
Dion Cho - Oracle Performance Storyteller
http://dioncho.wordpress.com (english)
http://ukja.tistory.com (korean)
================================

I made a slight modification with my test case to have mixed workloads of hard parse and logical reads.
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insert into t3 select level, level from dual connect by level <= 50000;
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pat1     varchar2(1000);
pat2     varchar2(1000);
va       number;
begin
select ksppstvl into pat1
    from sys.xm$ksppi i, sys.xm$ksppcv v
    where i.indx = v.indx
    and i.ksppinm = '__pga_aggregate_target';
for idx in 1 .. 1000000 loop
    -- try many patterns here!
    execute immediate 'select count(*) from t3 where 10 = mod('||idx||',10)+1' into va;
    if mod(idx, 100) = 0 then
      sys.dbms_system.ksdwrt(2, idx || 'th execution');
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          from sys.xm$ksppi i, sys.xm$ksppcv v
          where i.indx = v.indx
          and i.ksppinm in ('__shared_pool_size', '__db_cache_size', '__pga_aggregate_target')) loop
          sys.dbms_system.ksdwrt(2, p.ksppinm || ' = ' || p.ksppstvl);
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      select ksppstvl into pat2
      from sys.xm$ksppi i, sys.xm$ksppcv v
      where i.indx = v.indx
      and i.ksppinm = '__pga_aggregate_target';
      if pat1 <> pat2 then
        sys.dbms_system.ksdwrt(2, 'yep, I got it! pat1=' || pat1 ||', pat2='||pat2);
        exit;
      end if;
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end loop;
end;
/This test case showed expected and reasonable result, like following:
100th execution
__shared_pool_size = 92274688
__db_cache_size = 16777216
__pga_aggregate_target = 83886080
200th execution
__shared_pool_size = 92274688
__db_cache_size = 16777216
__pga_aggregate_target = 83886080
300th execution
__shared_pool_size = 88080384
__db_cache_size = 20971520
__pga_aggregate_target = 83886080
400th execution
__shared_pool_size = 92274688
__db_cache_size = 16777216
__pga_aggregate_target = 83886080
500th execution
__shared_pool_size = 88080384
__db_cache_size = 20971520
__pga_aggregate_target = 83886080
1100th execution
__shared_pool_size = 92274688
__db_cache_size = 20971520
__pga_aggregate_target = 83886080
1200th execution
__shared_pool_size = 92274688
__db_cache_size = 37748736
__pga_aggregate_target = 58720256
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(I'm still in dark age on this automatic memory target management of 11g. More research in need!)
I think that this is very clear and natural behavior. I just want to point out that this would result in unwanted catastrophe under special cases, especially with some logic holes and bugs.
================================
Dion Cho - Oracle Performance Storyteller
http://dioncho.wordpress.com (english)
http://ukja.tistory.com (korean)
================================

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Hi All,
I have exported data using exp command in oracle 11g by keeping deferred_segment_creation FALSE.
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What could be the reason or what other thing i have to do to make it work.
Thanks in advance
Mohsin J

Tables that were created before you changed deferred_segment_creation to FALSE and do not have any rows would still be segment-less tables --- i.e. not exported.
You need to issue an "ALTER TABLE tablename MOVE" for each of such tables (after having set deferred_segment_creation to FALSE) to force a rebuild of these tables with segments before the export.
Thus, the sequence is
1. set deferred_segment_creation to FALSE
2. identify all tables with 0 rows
3. issue an ALTER TABLE tablename MOVE for each of such tables from step 2
4. Re-run your export
alternatively use conventional export (exp) instead of datapump export.
Hemant K Chitale

Oracle 11g automatic archival // maintaining historic data

Hi Group,
We are planning to get Oracle 11g.
I want to know if Oracle 11g has the capability to do automatic archival?
My requirement is,
few of the tables in our application will have lot of records (data) and after some days/ months it might slog the performance cos of the table/db size, and also the old data will not be of much interest (but data cannot be purged/deleted until some years). Hence want to archive the old data (trigger conditions specified by the user) and will be needed to bring data back programatically whenever the user queries for the data belonging to that particular period(archived data).
Is there a feature available in Oracle to just specify the data to be archive and bring it back by giving a date/time input.

Hi,
First, this looks like a job for Oracle partitioning.
What is your motive for archiving? Improved performance? Cheaper media?
I want to know if Oracle 11g has the capability to do automatic archival? Sure, but you would have to script it yourself. Many shops do time-based rollover archiving with partitioned tables:
http://www.dba-oracle.com/t_partitioned_tablespace_archiving.htm
it might slog the performance cos of the table/db sizeNo, not if you are properly indexed . . . However, table partitioning can speedup queries against large tables with "partition aware" SQL:
http://www.dba-oracle.com/t_partition_sql_index_ss_hint.htm
want to archive the old data (trigger conditions specified by the user) I would not use triggers, schedule a job instead:
http://www.dba-oracle.com/t_archiving_data_in_file_structures.htm
needed to bring data back Sorry, back from where? You are archving to disk, right?

External tables in Oracle 11g database is not loading null value records

We have upgraded our DB from Oracle 9i to 11g...
It was noticed that data load to external tables in 9i is rejecting the records with null columns..However upgrading it to 11g,it allows the records with null values.
Is there are way to restrict loading the records that has few coulmns that are null..
Can you please share if this is the expected behaviour in Oracle 11g...
Thanks.

Data isn't really loaded to an External Table. Rather, the external table lets you query an external data source as if it were a regular database table. To not see the rows with the NULL value, simply filter those rows out with your SQL statement:
SELECT * FROM my_external_table WHERE colX IS NOT NULL;
HTH,
Brian

Data automatically become null in Oracle 11g DB

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