When I update or delete on partition table it shows eager spool in execution plan.
Image for Update query execution plan showing eager spool:-
I can’t understand why it is doing eager spool only when I am updating or deleting on partition table, same query when I run on non partition table it does not do eager spool.
The eager spool has to do with the size of data you're deleting.
In this case, you're updating a large quantity of rows on a table with several indexes. You're also updating a field that's covered by a lot of nonclustered indexes, and SQL Server has to update all of those indexes as well.
To avoid this operation, update less rows (as a percentage of the table) or index the table less heavily.
