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Terms you'll need to understand:
Concepts you'll need to master:
Historically, Oracle has used rollback segments to manage space dedicated to providing the ability to undo a transaction. This method (rollback segments) is now referred to as manual undo management mode. Manual undo management mode is still supported under all compatibility levels. You can still use this method when you are migrating to Oracle 9i to take advantage of some features or to be compliant, even if you are not yet ready to convert to automatic undo management mode (the new Oracle 9i method of automatically managing these segments). This chapter explains manual undo management and how it differs from automatic undo management. The term undo has replaced what was known in previous versions of the database as rollback. This chapter covers automatic undo management and how it happens in the Oracle 9i instance and database. In manual undo management, you create, allocate, and tune undo segments manually. This was the only option in previous releases of the database. |
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