HP Storage Essentials Enterprise Edition Software - Manual (Page 76)

Application Scripts Description and Usage 62
• Database Instance
• Dialog Instance
Further information regarding instances is available in SAP's documentation 1 . Dialog instances are
beyond the scope of this chapter.
The following sections provide a high-level overview of SAP instance terminology. For further
information, refer to related SAP documentation, such as the SAP DB documentation
( http://www.sapdb.org/sap_db_documentation.htm ) and SAP Adaptive Computing
documentation ( http://service.sap.com/adaptive ). A SAP user ID and password, or a SAP passport
are required to access the second website. Both of these reference websites were used as references
for this chapter.
SAP Central Instance
The SAP Central Instance (CI) is the basic mandatory SAP process that has to exist for a user to be
able to log on to the SAP Database (DB) Instance. The SAP CI is composed of physical servers and
numerous software components including a database gateway. It provides services used by clients
connected to the SAP system. SAP is structured in such a way that you can run the DB on one server
and the user processes on another server.
SAP Database Instance
The SAP Database (DB) Instance is the Database used for the SAP application. Each Database
Instance consists of threads, main memory structures (caches), and disk-based storage of the data.
Starting and Stopping SAP instances
There are multiple cases where a SAP Administrator needs to start or stop the SAP Central Instance
(CI) and Database Instance (DB) in order to perform other administration activities. Summarized
below are different cases where the SAP administrator may be required to start/stop the CI and DB
instances:
• Starting an SAP application service instance on a virtual hostname 1 .
• Resetting Service Status in case of failures 3 .
• Adding a New Computing Node to the ACC 4 .
• Adding a New Application Service to the ACC 5 .
• Stopping and starting the SAP system during Post-Installation and Post-Patch activities 6 .
HP SE SAP ACC users running the application together with SAP must start and stop SAP Central
Instance services and attach and detach the SAP Database Instance. This can be achieved by
3. Section 4.7.4 Reset of Service Status in case of Failures, SAP's Adaptive Computing Controller, Component
Implementation and Operation Guide, Release V1.0, Document version V5, February 15, 2006.
4. Section 5.1 Adding a New Computing Node to the ACC, SAP's Adaptive Computing Controller, Component
Implementation and Operation Guide, Release V1.0, Document version V5, February 15, 2006.
5. Section 5.2 Adding A new Application Service to the ACC, SAP's Adaptive Computing Controller, Component
Implementation and Operation Guide, Release V1.0, Document version V5, February 15, 2006.
6. Section 8, SAP's Adaptive Computing Controller 1.0 For SAP Web Application Server 6.40, Installation Guide,
Document Version 1.9, January 4, 2006.