Setting RBO in oracle 10g

Hello All,
my PROD is currently running in 9i hp ux. we are planning for upgrade to 10.2.0.4.
most of my application uses RBO in my 9i database. when it migrates to 10g Developers and customer dont want to use default CBO as they will have to make lot of changes in the code.
Can we retain the RBO in 10g database?
also how can we disable auto statistics gathering.
Thank you,
Anil

9i and beyond has optimizer_dynamic_sampling.
If you stop the job, it means Oracle will have to generate the statistics for every statement.
YMMV.
Your (or your customers) current strategy is to replace a T-Ford by a Ferrari, and to stick with the T-Ford engine (and the color of course which is black)
Sybrand Bakker
Senior Oracle DBA

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Using RBO in Oracle 10g

I have a test database 10g R2. I set the optimizer_mode=RULE.
SQL QUERY
Select Round(-1*Nvl(Sum(Alloc_Units),0),4) Open_Units, Sum(T.Cash_Amt) Open_Cash_Amt, Max(O.Applied_Date) Open_Applied_Date From Policy P , Operations O, Tx_Mboxs T Where P.Scheme_Id = :P_Scheme_Id And O.Status Is Null And Trunc(O.Applied_Date+0) < Greatest(:P_Date_From,:CF_Join_Date) And O.Op_Id = T.Op_Id And T.Policy_No = P.Policy_No And T.Person_Id = :Person_Id
Initial Explain Plan
PLAN_TABLE_OUTPUT
| Id | Operation | Name |
| 0 | SELECT STATEMENT | |
| 1 | SORT AGGREGATE | |
| 2 | NESTED LOOPS | |
| 3 | NESTED LOOPS | |
| 4 | TABLE ACCESS FULL | TX_MBOXS |
| 5 | TABLE ACCESS BY INDEX ROWID| OPERATIONS |
| 6 | INDEX UNIQUE SCAN | OPERATIONS_IDX0 |
| 7 | TABLE ACCESS BY INDEX ROWID | POLICY |
| 8 | INDEX UNIQUE SCAN | POLICY_IDX0 |
Note
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Here I use the index POLICY_IDX0 that has already been defined.
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PLAN_TABLE_OUTPUT
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)|
| 0 | SELECT STATEMENT | | 1 | 49 | 8321 (9)|
| 1 | SORT AGGREGATE | | 1 | 49 | |
| 2 | NESTED LOOPS | | 1 | 49 | 8321 (9)|
| 3 | HASH JOIN | | 1 | 33 | 8319 (9)|
| 4 | TABLE ACCESS BY INDEX ROWID| POLICY | 1 | 7 | 2 (0)|
| 5 | INDEX RANGE SCAN | POLICY_IDX13 | 1 | | 1 (0)|
| 6 | TABLE ACCESS FULL | TX_MBOXS | 3736 | 97136 | 8316 (9)|
| 7 | TABLE ACCESS BY INDEX ROWID | OPERATIONS | 1 | 16 | 2 (0)|
| 8 | INDEX UNIQUE SCAN | OPERATIONS_IDX0 | 1 | | 1 (0)|
It does not use the index, instead uses POLICY_IDX13 index.
The order has been changed from least to highest. As can be seen from below,
select num_rows from all_tables
2 where table_name ='POLICY';
NUM_ROWS
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select num_rows from all_indexes
2 where index_name ='POLICY_IDX13';
NUM_ROWS
1675
select num_rows from all_tables
2 where table_name ='TX_MBOXS';
NUM_ROWS
5014620
select num_rows from all_tables
2 where table_name = 'OPERATIONS';
NUM_ROWS
6091380
select num_rows from all_indexes
2 where index_name ='OPERATIONS_IDX0';
NUM_ROWS
5941450
What can be the reason that it is not using the index POLICY_IDX0? Maybe because Oracle desupports RBO in 10g. Can this be the reason?
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You don't seem to state categorically that you are using Solaris Cluster, so I'll assume it since this is mainly a forum about Solaris Cluster (and IMHO, Solaris Cluster with Clusterware is better than Clusterware on its own).
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Tim
---

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thx

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MODEL_DESC
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Error:     ORA-29275 (ORA-29275)
Text:     partial multibyte character
Cause:     The requested read operation could not complete because a partial
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Action:     Ensure that the complete multibyte character is sent from the
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Thanks for your answer FZheng. But i will just install software. I will not start any oracle 10g process until i reboot the machine.
I think that oracle software installacion should not be affected. Do you know if this parameter affect to compile softwere during OUI wizard progress???.
Before going on migration process and start database i will sure that this parameter is correctly fixed.
PD.: I couldn't read metalink reference that you've suggested becouse my metalink account have problem access in this momment. During all day i've been reeding metalinks docs without any problem until this momment, bad luck.
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~ Madrid

Oracle 10G support for both Cyrillic and Western European Character Sets

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Message was edited by:
frank.qian

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test@ORCL>
test@ORCL>

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Message was edited by: Rajesh Alex
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Setting RBO in oracle 10g

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