Home Forums SQL Server 2016 SQL Server 2016 - Development and T-SQL Getting suggestion for non-clustered index on a table with a clustered columnstore index (2016) -- need to understand how they relate RE: Getting suggestion for non-clustered index on a table with a clustered columnstore index (2016) -- need to understand how they relate

  • June 20, 2018 at 9:29 am

    #1994663

    As with any nonclus index, SQL estimating that too many pages will be needed from the nonclus index causes SQL to drop back to just scanning the main table.  I can imagine that this would be even more frequent with CCI tables than standard row tables, but I haven't done/seen any testing yet to confirm that.

    SQL DBA,SQL Server MVP(07, 08, 09) A socialist is someone who will give you the shirt off *someone else's* back.