Migrating from non-logging Informix to Oracle (use of transactions)

I wonder what happens when I migrate an Informix non-logging database to Oracle. Since my database doesn't use transaction (that's to say: a single DML sentence defines a transaction and transactions using begin/commit/rolback trans are not used), applications are written with no transaction philosophy. But Oracle is ANSI-compliant and then when I execute a DML sentence, a transaction begin and it'll finish until I send commit or logout. Then, even when migration is ok, my applications will create very large transactions.
What should I do? Is there some parameter to configure Oracle in such way it create single-DML transaction (I heard there's something like that in SQL*Plus, but I'm not sure)? Or should I rewrite applications sending commits after every sentence (The worst case, I think)?
Thanks in advance
Omar Muqoz

Hi Oscar,
Without actually viewing the Client application code, I can only make general assumptions..
You will have to change the client code anyway in order for it to work with Oracle e.g. Informix E/SQL -> Oracle Pro*C. The E/SQL Client code will have to be updated to reflect various changes in the DB environment; for example:
1. The use of REF CURSORS (passing them back to the client code)
2. Changes to the hardcoded Informix SQL statements to make them Oracle friendly (especially OUTER joins if you migrating to Oracle 8i)
3. Altering any E/SQL code that dynamically builds SQL statements (to make sure these SQL statements are syntactically correct in the Oracle model).
4. DB Connection methodologies.
5. Changing Informix #include files to reference equivalent Oracle #includes
6. Differences in date structs and how E/SQL and Pro*C handle dates (Oracle did not support milliseconds until 9i)
7. Exception handling.
8. Datatype changes between Informix and Oracle.
Again, there is no simple solution. A migration project that migrated the DB and Applications 'in tandem' would make it easier to remove logic from the client code and place it in the server (always a good thing) but this may not be feasable in your case.

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Migrating from non-loggin Informix to Oracle (use of transactions)

I wonder what happens when I migrate an Informix non-logging database to Oracle. Since my database doesn't use transaction (that's to say: a single DML sentence define a transaction and ttransactions using begin/commit/rolback trans are not used), applications are written with no transaction philosophy. But Oracle is ANSI-compliant and then when I execute a DML sentence, a transaction begin and it'll finish until I send commit or logout. Then, even when migration is ok, my applications will create very large transactions.

Hi Oscar,
Without actually viewing the Client application code, I can only make general assumptions..
You will have to change the client code anyway in order for it to work with Oracle e.g. Informix E/SQL -> Oracle Pro*C. The E/SQL Client code will have to be updated to reflect various changes in the DB environment; for example:
1. The use of REF CURSORS (passing them back to the client code)
2. Changes to the hardcoded Informix SQL statements to make them Oracle friendly (especially OUTER joins if you migrating to Oracle 8i)
3. Altering any E/SQL code that dynamically builds SQL statements (to make sure these SQL statements are syntactically correct in the Oracle model).
4. DB Connection methodologies.
5. Changing Informix #include files to reference equivalent Oracle #includes
6. Differences in date structs and how E/SQL and Pro*C handle dates (Oracle did not support milliseconds until 9i)
7. Exception handling.
8. Datatype changes between Informix and Oracle.
Again, there is no simple solution. A migration project that migrated the DB and Applications 'in tandem' would make it easier to remove logic from the client code and place it in the server (always a good thing) but this may not be feasable in your case.

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Edited by: 873671 on Jul 20, 2011 7:03 AM
Edited by: 873671 on Jul 20, 2011 7:19 AM

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<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Oracle Migration Workbench Team:
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Hi,
It looks like you've messed up the Non User (Oracle default user) data and/or metadata i.e sys, system, wksys.
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Edited by: wkobargs on Jan 13, 2009 3:01 AM

Migrating from non-logging Informix to Oracle (use of transactions)

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