Number of rows differences across 9i logical dataguard

Hi,
I have a wierd situation, and need help to investigate:
We have a 9i primary database and a logical standby database for reporting purposes. In the logcial standby, apart from the main APPDBM schema from primary, we also have RPTDBM schema containing reporting objects. RPTDBM doesnot exist in primary.
We maintain the guard_status to "STANDBY" level in logical standby database to allow modifications to the RPTDBM schema.
But, today, we have observed difference in the number of rows for many tables (131 out of 2000) between the APPDBM schema in primary and standby database.
How could this have happened? What safeguard we should implement to prevent?
Any help is greatly appreciated.

You have a customized solution. Without knowing all about the process of creating, populating, maintaining the reporting table, it's impossible to say.

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New table without statistics returns invalid number of rows

Hi,
I've been searching for a while now for an explanation for the following "problem"
We have an Oracle 11.1.0.7 database on AIX5.3
In this database we have two tables, called KRT_PRODUCTS_INFO and KRT_STRUCTURES_INFO ( the table name don't really matter ).
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If we recreate these tables like:
CREATE TABLE KRT_PRODUCT_INFO_BUP AS SELECT * FROM KRT_PRODUCT_INFO;
DROP TABLE KRT_PRODUCT_INFO CASCADE CONSTRAINTS;
CREATE TABLE KRT_PRODUCT_INFO (...) TABLESPACE PIM_DATA NOLOGGING NOCOMPRESS NOCACHE NOPARALLEL MONITORING;
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CREATE INDEX KRT_PRODUCT_INFO_X2 ON KRT_PRODUCT_INFO (PIM_ARTICLEREVISIONID) NOLOGGING TABLESPACE PIM_DATA NOPARALLEL;
INSERT INTO KRT_PRODUCT_INFO (SELECT * FROM KRT_PRODUCT_INFO_BUP);
COMMIT;
CREATE TABLE KRT_STRUCTURE_INFO_BUP AS SELECT * FROM KRT_STRUCTURE_INFO;
DROP TABLE KRT_STRUCTURE_INFO CASCADE CONSTRAINTS;
CREATE TABLE KRT_STRUCTURE_INFO (...) TABLESPACE PIM_DATA NOLOGGING NOCOMPRESS NOCACHE NOPARALLEL MONITORING;
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CREATE INDEX KRT_STRUCTURES_X3 ON KRT_STRUCTURE_INFO (STRUCTURE_GRP_ID) NOLOGGING TABLESPACE PIM_DATA NOPARALLEL;
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If we however generate statistics on these tables after creation, the correct number of rows is returned, being 1.167.991 rows
The statistics are gathered using:
BEGIN
SYS.DBMS_STATS.GATHER_TABLE_STATS (
OwnName => 'PIM_KRG'
,TabName => 'KRT_PRODUCT_INFO'
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,Method_Opt => 'FOR ALL COLUMNS SIZE REPEAT '
,Degree => NULL
,Cascade => TRUE
,No_Invalidate => FALSE);
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BEGIN
SYS.DBMS_STATS.GATHER_TABLE_STATS (
OwnName => 'PIM_KRG'
,TabName => 'KRT_STRUCTURE_INFO'
,Estimate_Percent => NULL
,Method_Opt => 'FOR ALL COLUMNS SIZE REPEAT '
,Degree => NULL
,Cascade => TRUE
,No_Invalidate => FALSE);
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I tested this behaviour in Toad and sqlplus ( first thought it was Toad ), and both behave the same.
Another fact is, that the "problem" is NOT reproducable on our TEST environment, that runs on Oracle 11.1.0.7 on Windows2008
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AND sgr."StructureGroupID" = asm."StructureGroupID"
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Thanks
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Hemant K Chitale wrote:
These two tables are in the PIM_KRG schema while the other tables in the query are distributed across two other schemas "KRAMP_HPM_MAIN" and "KRAMP_HPM_MASTER" ?
Do you happen to have the same table names occurring in multiple schemas - the query is then referencing the data in the wrong schema ?
Hemant K ChitaleHi,
This is not the case. The KRAMP_HPM schema's are application dedicated schema's
And this also then does not explain why the results are correct after generating statistics.
Anyway thanks for the tip.
FJFranken

How to Efficiently Sample a Fixed Number of Rows

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This is the idea:
INSERT INTO Tmp_Table (Value, Sequence) SELECT Value FROM Perm_Table, DBMS_RANDOM.VALUE;
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A       Bill    1234     1        Yes
A       Fred    5678     3        No
A       George 1927     2        Yes
B       April   5784     2        No
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Populating the list with random values is not time-consuming, but calculating Position is. This is my code:
UPDATE Tmp_Targets T1
SET Position =
SELECT
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FROM
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WHERE
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Jonathan

You've not given any indication of how max targets for a given project is determined, so for my example I'm using the ceiling of 1/2 of the number of records in each project which gives the same number of yes and no responses per project as you had:
with dta as (
select 'A' project, 'Bill' person from dual union all
select 'A', 'Fred' from dual union all
select 'A', 'George' from dual union all
select 'B', 'April' from dual union all
select 'B', 'Janice' from dual
), t1 as (
select project
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       , count(*) over (partition by project) cnt
       , rownum rn
    from dta
select project
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from t1
order by rn
PROJECT PERSON ORD                    CNT                    KEEP
A       Bill   2                      3                      Yes
A       Fred   3                      3                      No
A       George 1                      3                      Yes
B       April 1                      2                      Yes
B       Janice 2                      2                      No
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Regards,
Naseer.

Hi,
Try this code...
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Is there any way to add a 'Maximum No. of Hits' field to the SQVI selection screen similar to what is found when using SE16?
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Bob

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When the driver produces a result set with a very large number of records, it has to generate those records and deliver them to the system that requested them. If the database is not on the same system, then those records must all travel over the network. It could be a performance problem if you had to wait for (say) 80,000 records to travel across the network. Enter the fetch size. If you set the fetch size to 100, then the driver will bring the records across in batches of 100, as the program calls for them. Now, this buffering is transparent to your program; the driver doesn't tell you that it's getting another batch and you can't tell it to get another batch. So it is not a solution to the problem that everybody has here, namely how to display your records 10 per page and allow the user to go back and forth among those pages, like search engines do.

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If you have logic like this
SELECT COUNT(*)
INTO l_cnt
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WHERE deptno = p_deptno;
IF( l_cnt > 1 )
THEN
FOR x IN (SELECT * FROM emp WHERE deptno = p_deptno)
LOOP
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second 500 - flag -> 2
etc..but I m convinced that exists a way of doing this more easy..without damaging my structure..
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Hi,
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first of all thanks for reply, i will take care of your suggestion.
Number of rows in table : More than 3*10pow7(30 Milion rows)(But it can be more than 120 milion)
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for eg.
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EG2 {a,June-01-2011 10:13:12} is present only one time,so i dont want this rows in output.
EG# {e,June-01-2011 10:26:12},{e,June-01-2011 11:38:12} is present 2 times in db,but not in the interval of 10 minutes,so i dont want this rows as output.(t1=10:26:12,t2=11:38:12 difference is more than 10 minutes.)
In my eg. i specified only 2 columns but in actual scenario there will be 8-10 columns in table.This is only one pattern which i specified,but there are many more pattern which i have to search in db.As specified above in eg. was only one pattern,After fulfiling this pattern It has to pass many other pattern.and i want result should be retrieved very fast.
Please dont go into answer of above eg.Actually i want, what should be approach of such type of problems?
Is this problem related to oracle data mining and how?
Can data mining algorthms(Minimum Description Length ,Naive Bayes,Apriori,Decision Tree,Non-Negative Matrix Factorization ,Support Vector Machine...etc..) solve my problem?
Different-2 type of queries will be fired against this table?
if i am still not clear then let me know.

How to count the number of Rows to be Updated before Update takes place..

Hi all,
I have a requirement, where i have to count the number of rows to be updated before updating it. SQL%ROWCOUNT gives the no. of rows updated ( after update takes place). How do i get to know the count of no. of rows to be updated/inserted/ deleted. I was looking for a simple solution, as above SQL%Rowcount. But i couldn't find any. I can use a Function and Return the value which will give me number of rows to be updated, But is there any Simple Logic other than this.. or any count function. Your Help is Appreciated. Thanks!

If you really want to do this (I have no clue why you would need it), then you can piggy back on any existing pessimistic locking you may already have in place.
However, it would require two loops through the records of which you want to know the count before you update, and a second pass to update them.
I would really re-think the need for this, though.
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Table created.
SQL> insert into t0304 select rownum from all_objects where rownum <= 10;
10 rows created.
SQL> commit;
Commit complete.
SQL> select * from t0304;
         C
         1
         2
         3
         4
         5
         6
         7
         8
         9
        10
10 rows selected.
SQL> declare
2    cursor mycursor is select * from t0304 where mod(c,2) = 0 for update;
3    i number := 0;
4 begin
5    for r in mycursor loop
6      i := i + 1;
7    end loop;
8    dbms_output.put_line(i);
9    for r in mycursor loop
10      update t0304 set c = c + 20 where current of mycursor;
11    end loop;
12 end;
13 /
5
PL/SQL procedure successfully completed.
SQL> commit;
Commit complete.
SQL> select * from t0304;
         C
         1
        22
         3
        24
         5
        26
         7
        28
         9
        30
10 rows selected.
SQL>Edited by: Steve Howard on Mar 4, 2011 5:57 PM

Total number of rows fetched

hi
Is there any way to get total number of rows fetched along with
result set in a single query
jos

Hi,
You are referring to "Analytical Functions"
COUNT(*) OVER ()the above one your are counting the number of records, with respect to logical parition window -as if you specify with it the over clause. it won't provide the information as required, with respect to the your first post.
- Pavan Kumar N

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I was using SQL performance analyzer to compare performance difference between 9i and 11g databases.
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After runing two trials and comparison the report showed performance regression (comparing "buffer gets") while using following SQL statement
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After querying dba_tables view for number of blocks in emp table on both sides i found that EMP table in 9i database had 1 block where as in 11g emp table had 5 blocks (Even after using alter table emp move;)
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user8916506 wrote:
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Results shows that SYSTEM tablespace in 9i database is locally managed.
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EXTENT_MAN INITIAL_EXTENT ALLOCATIO
LOCAL 65536 SYSTEMGood to see that you also picked up the allocation_type at the same time.
So you have shown that the discrepancy between 9i and 11g isn't down to the difference in extent management.
Are there any other differences between the tablespaces when you compare 9i system with non-system, and 9i system with 11g non-system ? (Hint - we have an anomaly with space allocation.)
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
Author: <b><em>Oracle Core</em></b>

Number of rows differences across 9i logical dataguard

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