OS-DB migration for Oracle

Question

Hello,
I am doing an os-db migration of ECC 5.0. I have one query,
1. My source database is on Oracle 9.2
2. I want to build my target on Oracle 10g.
After exporting the database from Oracle 9i using R3load can i import it directly into Oracle 10g ?
If yes what care I have to take, Are there any post installation steps which needs to be performed after importing the data e.g converting long column to lob etc.
Has anyone tried doing this.Please reply me if someone has performed this kind of migration.
Regards
Deepak

Answer 1

Hello Deepak,
>> Has someone performed the migration of LONG-LOB migration and faced performance issues ?
Yes i have done some upgrades from 4.6c to ERP 2005 (with unicode migration) and in this scenario the LONG columns will be converted to LOBs (as i already mentioned, because i have used a R3load 7.00).
A good example for the "automatic" LONG-LOB migration with R3load 7.00 is the table VBDATA. You can test it very easily by exporting and importing it with a R3load 7.00 - the column VBDATA type "LONG RAW" will be converted to BLOB.
I have not faced any performance issues relating to the LOB migration, but this depends on your tables and how they will be used. The performance problems depends on caching or if the LOBs are in-line or out-line ...
For example the column VBDATA is cached and stored in-line:
> SQL> select COLUMN_NAME, CACHE, IN_ROW from ALL_LOBS where TABLE_NAME = 'VBDATA';
> VBDATA  YES        YES
If you want to know more about LOBs and their performance factors - take a look at the oracle whitepaper:
http://www.oracle.com/technology/products/database/application_development/pdf/lob_performance_guidelines.pdf
Regards
Stefan