How do you start SAP R/3?

A. To start R/3, run the shell script startsap from the home directory of user adm. startsap starts the saposcol process, which is the statistics collector for operating system resource data, if it is not yet running.

• startsap calls the script startdb, which starts the database if it is not already started.
• startsap then starts the central instance. The R/3 System administrator can start additional instances and application servers.

To start the instances independently of the database, use the script startsap. startsap has the following options:

• startsap r3: Checks if the database is running; if it is, only the instance is started
• startsap db: Starts only the database
• startsap all: Default entry; starts both the database and the R/3 instance