SEGTYPE=DATA in v$sort_usage

>Hi List,
>
>I noticed a couple of entries in v$sort_usage with SEGTYPE = DATA when a
>developer was doing an insert - confirmed using SESSION_ADDR. I'm
>familiar with SORT and HASH appearing here but what does DATA mean? Any
>why is the temporary tablespace being used at all. The insert was INSERT
>INTO table SELECT * FROM (same)table WHERE ROWNUM < 1000 (i.e. No
>sorting/joining etc.).
>
>However, we've been unable to recreate the behaviour by running the insert
>again (something else was happening at the time?).
>
>Not critical - just curious!
>- Bill.

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Author: Bill Buchan
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