Re: Transportable Tablespace, SCNs and ORA-1555s.

  • From: Carel-Jan Engel <cjpengel.dbalert@xxxxxxxxx>
  • To: oracle-l@xxxxxxxxxxxxx
  • Date: Thu, 18 Mar 2004 02:34:15 +0200

At 03:08 AM 3/18/2004, you wrote:

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?

Nope.


Read Connors article at his site http://www.oracledba.co.uk/. No direct referral possible, look under Administration -> Slow read-only, an article dated 14-06-2002.

Regards, Carel-Jan

===
If you think education is expensive, try ignorance. (Derek Bok)
===



--- Daniel Fink <Daniel.Fink@xxxxxxx> 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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