Archives of the TeradataForum
Message Posted: Fri, 02 Nov 2012 @ 17:31:42 GMT
| Subj: || || Re: Query on NUSI |
| From: || || Pluebell, Fred |
You are correct. NUSI index entries are stored on the same AMP as the row they point to, while USI index entries are hash distributed on the
A consequence is that any access via NUSI is inherently all-AMP, while USI retrieval of a single row is a two-AMP operation.
Note that it is also possible to define a Hash Index or Join Index that effectively functions as a "hashed NUSI".