New opportunities for statistics collection in Teradata 14.0 - comment by carrie

When you drop a single-column index, the single-column statistics will remain and can be used by the optimizer in generating a plan. The stats are still valid.

However, if you have an index on multicolumn statistics, and you have collected statistics on the index, those statistics will go away when you drop the multicolumn index, at least at your software release.

In Teradata 14.0 that changes. In 14.0 when you drop an index on multiple columns, any stats you have collected will remain.

Thanks, -Carrie