and answering with a brain that refuses to look it up in the docs since
I'm home...
when you alter the tablespace to read-only, doesn't Oracle clean out
all the blocks in the datafiles?
- Daniel Fink <Daniel.Fink_at_Sun.COM> wrote:
> This is not in response to an actual problem, it is just the
> result of a brain that goes off on tangents way to often...
>
> How does a transaction know NOT to build a consistent version of
> data that has been transported?
>
> Sequence of events
> 1) Insert records into table1. A Commit SCN of 100000 is
> assigned. Due to the size of the insert, there are blocks in the
> table that still have an Uncommitted state.
> 2) Alter tablespace1 (containing table1) to read only and
> transport it to database2.
> 3) Start a query in database2 (with an SCN of 1000) that
> accesses the newly transported table1.
>
> Will the query get a 1555?
>
> Yes - It cannot create a read consistent view to SCN 1000
> No - It knows that this data came from another database, so it
> does not attempt to build a read-consistent version
>
> Thoughts on which is correct? I know, I know...build a damn
> testcase and see for myself. I'm working on it, but I wanted to
> see what you all thought first.
>
> Daniel
>
>
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Received on Wed Mar 17 2004 - 19:05:16 CST
