Starting an SAP System is performed in a number of steps and is the task of
the operating system user <sid>adm.
<b>Start the database:</b>
a. The underlying element of the entire SAP system is the database. Before
the SAP instances are started, this must have operational status. The
database is therefore always started as the first step.
<b>Start the central instance:</b>
a. Next, the operating system collector SAPOSCOL is started, if it is not
already active. This is a standalone program that runs in the operating
system background, independently of SAP instances. It collects data
about operating system resources and makes this data available through
the shared memory of all SAP instances.
b The central instance with the message server and the dispatcher and its
work processes is then started. Only once the message and enqueue
servers are active can other instances be started, if desired.
<b>Start other instances</b>:
a. If the dialog instance is not running on the same host as the central
instance, the SAPOSCOL operating system collector is first started on
this host.
so from the above initial CI startup profile is read with the help of default profile then instance profile is read
Samrat
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