http://www.sqlperformance.com/2013/03/io-subsystem/chunk-deletes

http://social.msdn.microsoft.com/Forums/sqlserver/en-US/52e6be98-6165-4b1e-a926-5d5609ab8486/delete-large-number-of-rows-without-growing-the-transaction-log

Performing backup of complete database monthly 2 or 3 times.

Also hosting team will take regular backups of database. But i don't know which recovery model they are using.

Currently performance of...