User Guide

SAP AG November 2002
7.4.03
. . . . .
Operating System Platforms
SAP DB Version 7.4 supports the following operating system platforms:
• Compaq True64 Unix / Alpha
• IBM AIX / PowerPC
• SUN Solaris / SPARC
• HP-UX / HP-PA
• Linux / Intel
• Windows XP
• Windows NT / Intel
• .Net Server (under construction)
Multiprocessor Configuration
To allow multiprocessor configurations to be used to the best advantage, the database
system supports external/internal tasking that can be configured.
The aim here is to allow the maximum possible number of database sessions [Page
135] to
be supported by the minimum possible number of operating system threads.
The configuration of the database system controls the degree of external/internal tasking via
the two parameters MAXUSERTASKS [Page 86] and MAXCPU [Page 85].
On a computer, 4 processors are available for the database instance [Page
132].
No more than 800 database sessions should be running simultaneously.
In this case, set MAXCPU to 4 and MAXUSERTASKS to 800.
The database instance can then utilize the four processors by establishing four
operating system threads, each of which performs an internal tasking for up to
200 users.
User Concept
The SAP DB database system uses SAP DB user classes [Page 149] and supports different
roles (role concept [Page
30]).
Setting Up a Database Session
A database session [Page 135] is started when the user logs on to the database instance
[Page 132]. In order to log on, certain user data needs to be transferred to the SAP DB
component for identification purposes.
User Manual: SAP DB 25