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6

The question is, how can i make counting by xml as fast as counting by column? Depending on how flexible you need to be with your xPath expression you could use property promotion. create function dbo.GetSomeText(@X xml) returns varchar(8) with schemabinding as begin return @X.value('(/SomeText/text())[1]', 'varchar(8)'); end; go alter table dbo.T ...


7

Data differences With a low amount of records to seek on, the optimizer is able to use the SIX_T_pathXQUERY index: and filter on moretext with a seek predicate: An interesting part here is that it executes the key lookup to get the path_1_id values that are not null. Since that is a filter definition on the nonclustered xml index... ...while not being ...


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