Although hundreds of system-stored procedures exist, you will find a core group of 10 or 20 that you commonly use on your system. Many of the procedures prefixed as sp_help are, to risk stating the obvious, helpful. For instance, sp_helpdb returns information about all databases, or if a database name is specified, about a single database, such as sp_helpdb 'pubs' .
Table 10.7 lists some common system-stored procedures.
Table 10.7. Common System-Stored Procedures