About SAP Clients
With a standard installation, SAP delivers 000, 001 and 066 clients. Client 000 is considered to be a SAP reference client and it should not be changed or deleted at anytime from the system. After a SAP system is installed, you can create other clients from 000 by using the client copy procedure. For some important configuration you have to logon to client 000. For example, if you want to configure your CTS system then this client must be used. Client 000 also plays a very important role in upgrade process. Every time you do upgrade client dependant changes will be automatically upgraded in this client and later on the changes can be copied to other clients.
The customer uses client 001 as a SAP sample client. After a new installation both 000 and 001 clients are identical, but after an upgrade 000 will have additional customizing data. Lot of customer sites does not use 001 client at all. Client 066 is there for SAP Early Watch service. This client enables SAP to remotely access the customer system. SAP provides this service to the customer to improve the system performance. After Early Watch group goes through the checking methodology, a system performance summery and recommendations to improve performance report are provided to the customer. SAP recommends to go for an Early Watch session before your project goes live and another one sometime after the go live date. Client 066 should not be changed or deleted from the system.
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