INDEX SCAN

Advantage SQL Engine

A table is being scanned in indexed order using a scope. This is generally the most efficient method for returning a subset of rows from a table predicating on restrictions on column values in the table. For example, suppose the restriction is "customer_id = 222" and an index exists on the customer_id column in the table, a scope with the top value of 222 and a bottom value of 222 can be applied using the index to quickly limit the set of rows returned. For this operator,

If the query engine determines that a new index is needed to optimize the query the "Tag Name" will be "Temp".

See Also

How Indexes are Used by ORDER BY Clauses