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Message Posted: Thu, 31 Jan 2002 @ 12:59:16 GMT


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Subj:		Re: What happens to Collect Stats & Metadata while exporting/archiving?

From:		David Wellman

Hi,

No, you don't need to collect statistics just because you've archived the data. In Teradata, archiving the data doesn't change it -- so there's no point in collecting statistics again.

In Teradata there are different types of archive, basically "all-AMP" and "cluster dump". An "all-AMP" archive will contain the metadata (including statistics) on the archive media whereas a "cluster dump" will not. Hence restoring from an "all-AMP" archive will restore the metadata and statistics that were in place at the time of the archive.

There is a third type of archive, called a "dictionary rows" dump. This only contains the metadata, it does not include the data rows themselves. This type of dump is often used in conjunction with a "cluster dump".

Hope that helps.

Dave

Ward Analytics Ltd: Information in motion (www.ward-analytics.com)