Thomas, folks Is there some way of Avoiding creation of Constraint on Source/Master table while using Materlialized view refresh? NOTE - Production Database does NOT have any constraints & is of 600 GB Creation of constraints on Source/Master DB Tables would be very time consuming, if attempted. Thanks indeed for the info. -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Thomas Day Sent: Thursday, August 25, 2005 10:10 PM To: oracle-l@xxxxxxxxxxxxx Subject: Re: Some Basic Qs on materialized views It's not the size of the database that determines how often you refresh the materialized views. Rather, it's the frequecy with which the data changes on the source database and how important it is to the business that that data is reflected in the target database in a timely fashion. We used 15 minutes for transaction oriented tables, 1 hour for tables that were less volatile and 24 hours for look-up tables (e.g., country_codes) where the table's content was only changed via a software change request. We used dbms_jobs to schedule and fire the refreshes. -- //www.freelists.org/webpage/oracle-l **************** CAUTION - Disclaimer ***************** This e-mail contains PRIVILEGED AND CONFIDENTIAL INFORMATION intended solely for the use of the addressee(s). If you are not the intended recipient, please notify the sender by e-mail and delete the original message. Further, you are not to copy, disclose, or distribute this e-mail or its contents to any other person and any such actions are unlawful. This e-mail may contain viruses. Infosys has taken every reasonable precaution to minimize this risk, but is not liable for any damage you may sustain as a result of any virus in this e-mail. You should carry out your own virus checks before opening the e-mail or attachment. Infosys reserves the right to monitor and review the content of all messages sent to or from this e-mail address. Messages sent to or from this e-mail address may be stored on the Infosys e-mail system. ***INFOSYS******** End of Disclaimer ********INFOSYS*** -- //www.freelists.org/webpage/oracle-l