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Archives of the TeradataForum
Message Posted: Thu, 16 Mar 2006 @ 23:41:29 GMT
| Subj: | | Re: Identifying Large NUSI ? |
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| From: | | Stover, Terry |
I suggest just using the 8 or 10 bytes per row thumbrule. I did some fairly extensive testing a few years back and all the NUSI's fell in the
range of 8.1 to 8.5 bytes per row. For a gross ranking a 10% error probably isn't worth worrying about.
If youre looking at space & performance, I recommend comparing the table access counts to the nusi access counts from the DBC tables. If
the table isn't accessed very often, or if the nusi is infrequently used (relative to table access) you can drop it with little performance
impact. The question isn't so much how big are the nusi's, it's how cost effective are they.
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