Re: select statement to remote database use rollback seg.

Thank you for the info. I am learning this in a hard way also.

Do you know if the used rb segment continue to grow for the same session that continue issuing remote queries?

Bob
Mark D Powell wrote in message
<178d2795.0106070502.cb4a2c8_at_posting.google.com>...
>"Robert Yeh" <robert.yeh_at_qwest.com> wrote in message
 news:<9fm61d$3dd$1_at_bob.news.rcn.net>...
>> Does anyone know why does a select statement that involve a remote
 database
>> use rollback segment? What is stored in the rollback segment? Does the
>> rollback segment keep growing after the creation?
>>
>> Thanks
>
>Yes, if you read between the lines in the Distributed manual Oracle
>tells you that all remote SQL takes an entry in rbs for two-phase
>commit processsing. You should issue a commit after the select to a
>remote instance in query only applications to release it, otherwise,
>when it comes time for the rbs segment to wrap around and reuse the
>extent it will be busy and the segment will extend. It is very
>possible, if you system has several permanently present jobs that
>issue remote queries, to end up consuming all available rbs segments
>extents up to maxextents and for the ever expanding segments to
>consume all available space in the tablespace. You might guess I
>learned this fact the hard way.
>
>-- Mark D Powell --
Received on Thu Jun 07 2001 - 14:56:54 CDT