Refresh Materilaized Views without generating Archive Logs

Question

Hello Gurus,
I'm facing an emebarassing situation,
I've a job every night to execute a dbms_refresh on several materialiled Views, but there are 2 Mviews that take almost 30 minutes each but another issue thay generates almost 10G of data and my File system becomes full in a minute.
I've done an alter Mview Nologging but it doesn't change anything.
Does soemon ahve an idea how to do a refresh without generating Archive logs - or
without logging?
thxs in advance
C.

Answer 1

Since this is a TRUNCATE and INSERT, any user / application querying the MV while the Refresh is running will see ZERO rows. Furthermore if the INSERT fails (e.g. insufficent space to add an extent), the MV remains with ZERO rows.
A DELETE and INSERT avoids such situations (even if the refresh fails, both INSERT and DELETE are rolled-back and the MV is reverted to the state as it was before the Refresh began -- thus showing data from the previous refresh)
Hemant K Chitale
http://hemantoracledba.blogspot.com
Just to clarify : My paragraphs above are not about data "missing" but about precautions to be taken. A COMPLETE Refresh is done during defined outages -- users/applications are made aware that data is not available while the Refresh is running.
Edited by: Hemant K Chitale on Sep 1, 2009 10:53 AM