>I have a table with about 200,000 records (Invoice line items) and I have an index tag on the Invoice number and Deleted(). Sys(3054,1) indicates full optimization. What I observe is when you include a 'group by' Invoice (multiple items per invoice) clause, having an index tag on Deleted() has no effect on performance. The query was very simple:
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>select invoice from lineitms group by invoice
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>Anyone else observer this as well. Any other optimization tips? All I wanted was a unique list of invoice numbers in this table.

As soon as we add a GROUP BY clause in the SQL, we can't be fully optimizable anymore. This is not related to DELETED() tag or not.