As you might come across this BlogPost here but still there are more doubts to be cleared on the reasons for granting Lock Memory in Pages option to the SQL server instance. There is still lot of confusion over there to check whether lock memory in pages option must be set on SQL 2005 and not very clear...
In SQL Server, you can create database roles for easier administration of permissions in a database. Instead of granting individual permissions to each user separately, you can group users with the same permission needs by making them members of the same regular database role, and then assigning permissions...