Find largest tables. Usually, we can prioritized index design based on slow queries that could be referencing one or more largest tables.

 --Find largest tables.  Usually, we can prioritized index design based on slow queries that could be referencing one or more largest tables.

TOP 20 Largerst
"select top 10 schema_name(tab.schema_id) + '.' + tab.name as [table],
cast(sum(spc.used_pages * 8)/1024.00 as numeric(36, 2)) as used_mb,
cast(sum(spc.total_pages * 8)/1024.00 as numeric(36, 2)) as allocated_mb
from sys.tables tab
join sys.indexes ind
on tab.object_id = ind.object_id
join sys.partitions part
on ind.object_id = part.object_id and ind.index_id = part.index_id
join sys.allocation_units spc
on part.partition_id = spc.container_id
group by schema_name(tab.schema_id) + '.' + tab.name
order by sum(spc.used_pages) desc;"