AW: [HACKERS] Plans for solving the VACUUM problem

[Zeugswetter Andreas SB]

 
> REDO in oracle is done by something known as a 'rollback segment'.  

You are not seriously saying that you like the "rollback segments" in Oracle.
They only cause trouble: 
1. configuration (for every different workload you need a different config) 
2. snapshot too old 
3. tx abort because rollback segments are full
4. They use up huge amounts of space (e.g. 20 Gb rollback seg for a 120 Gb SAP)

If I read the papers correctly Version 9 gets rid of Point 1 but the rest ...

Andreas

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