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8.0

"Reformatting a Database"

Asked by dslavin in Oracle Database

Tags: oracle, script, table

To improve database performance we would like to split the tables in our database between four separate tablespaces. Currently they are all stored in a single tablespace.

Can someone outline the steps for reformatting the database in place without having to recreate a new database. Here are the steps we have developed so far, with questions regarding areas that we are uncertain of. Thank you.

Note: We are just working with the tables of a single SCHEMA (i.e. user) and we don't want to make any changes to other SCHEMA in the same database. This is an Oracle 7.3.4 DB.

"Reformatting a Database In Place"
----------------------------------
1) Export all existing tables for SCHEMA
2) drop user SCHEMA cascade
3) drop tablespaces used by SCHEMA
4) delete datafiles associated with SCHEMA
5) Run script to create new tablespaces
6) Run script to create tables in new tablespaces
7) Import tables

Questions:
----------
1) What are we forgetting?
2) How do we handle redo logs? Where are they stored?
3) How do we make sure that we are not corrupting tablespaces and/or datafiles being used by other schema?
4) How do we make sure that we are not corrupting the SYSTEM tablespaces, datafiles, objects, etc.?
5) Are the redo logs shared by SYSTEM and can we drop them or do we have to somehow modify them carefully?
6) What about rollback segments?

Thanks for any help in this area.

P.S.: The reason we want to reformat the database in place is so that the user doesn't have to create a new database. There are some problems with not being able to have two databases on the same server with the same name and the customer has hardcoded the database name into their code so they don't want to rename their database during the upgrade.
If there is some way for them to create a new database with the same name as the old database, then that would be good as well.

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20091021-EE-VQP-81

"Reformatting a Database"

Asked by dslavin in Oracle Database

Tags: oracle, script, table

About this solution