Answer Posted / ajay kumar gupta

An extended stored procedure is simply a procedure that is
implemented in a dynamic link library (DLL) — a library
that is called by an application at runtime. Extended
stored procedures can be used in much the same way as
database stored procedures, except that extended stored
procedures normally perform tasks related to the
interaction of SQL Server with its operating environment.
Tasks that are either too complicated or just not possible
using Transact-SQL can often be performed with extended
stored procedures.
Extended stored procedures are written using the Open Data
Services (ODS) API. ODS is written and supported by
Microsoft and is available on the Workstation version of
SQL Server and as a separate product (and in the Back-
Office Development Kit). The ODS development package
includes both a static-link library (Opends60.lib) and C
header files that let you create fully functional database
services. ODS applications are dynamically linked with
Opends60.dll.

SOme are the type of Extend Stored Procedure..
XP_Cmdshell, xp_logevent, xp_deletemail, xp_sendmail

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