sqlserver性能调优常用方法

select o.name,
        SUM(p.reserved_page_count) as reserved_page_count,
        SUM(p.used_page_count) as used_page_count,
        SUM(
        case
        when(p.index_id<2) then (p.in_row_data_page_count+
        p.lob_used_page_count+p.row_overflow_used_page_count)
        else p.lob_used_page_count+p.row_overflow_used_page_count
        end
        ) as DataPages,
        SUM(
        case
        when (p.index_id<2) then row_count
        else 0
        end
        ) as rowCounts
        from sys.dm_db_partition_stats p inner join sys.objects o
        on p.object_id=o.object_id
        group by o.name
        order by rowCounts desc