SAP Basis

ADM100 Lesson: Configuring SAP Logon
Figure 7: Program Buffer Without the Use of Logon Groups
If a large number of different applications are run, old buffer contents
may be replaced with newly requested contents. This means that the
next time the older contents are called, they must be requested from the
database again. This reduces the response time behavior of the system,
in some circumstances to an appreciable extent. A solution would be to
create a program buffer that was sufficiently large to contain all requested
programs. An alternative solution is the logon group concept explained
in the following text.
Using logon groups, you can group instances with transaction SMLG
(Tools CCMS → Configuration → Logon Groups). In the example above, four
instances are assigned to the logon group SD, and three instances to the
logon group FI. The message server of the system also has these details
within five minutes after the new group definitions are saved. From now
on, you can access these groups using “group selection” in SAP Logon.
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