Vladimir Begun wrote:
Full scan
This is available if a predicate references one of the columns in the
index. The predicate does not need to be an index driver. Full scan
> is also available when there is no predicate, if all of the columns
> in the table referenced in the query are included in the index and at
> least one of the index columns is not null. Full scan can be used to
> eliminate a sort operation. It reads the blocks singly.
To avoid any confusion 'singly' here means "logically singly' -- in the
reality (modern versions) it looks more like scattered read. Also this
'singly' depends on session settings.
--
Vladimir Begun
The statements and opinions expressed here are my own and
do not necessarily represent those of Oracle Corporation.
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Author: Vladimir Begun
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