Profile Management in SAP

What is Profile ?

• Profile's are useful to run and control SAP system.
• Profile contain parameters.
• This parameters having Values, this values control our SAP system.

The profile files are automatically created during installation. After installation complete,the profile are stored at operating system level in the Directory:
\usr\sap\<SID>\SYS\profile


This directory can be read by all instances of an SAP system using the share or mount technique.
The configuration of the individual instances and therefore of the Sap system is performed using system parameters.The Default values for these parameters are defined in the program code of the Kernel.Instance is managed by using profiles.


Profile Types:
There are 3 types of profiles.
1. Start Profile :
Start up profile consists of start up parameters like

• Starting database
  
• Starting Message Server
  
• Dispatcher+work
  
• Workprocess
  

Start up profiles are used for when Sap system is going to start, it will follow the start up profile values and order.Do nor modify these parameter under any circumstances on Os level . It is instance-specific
START_<instance><Instance number>_<hostname>
In this we can specifies which processes are to be started for each instance there are for example ,the message server and the dispatcher.
Start up profile are one or more available based on instances. Number of instance is equal to start up profiles


2.Default profile :
It is used to provide global parameters for all the instances. For example:

• Buffer parameters
  
• Message server host
  
• Enqueue host
  
• Security parameters(password,user restrictions)
  

There is only one default profile for each SAP system and it is read by all instances.It contains system-wide settings such as the system name, the name of the database server, the name of the enqueue server or also the Default logon client.


3.Instance profile:
The instance profile is therefore instance-specific. This is used to set the instance specific parameters.
The instance profile (<SID>_<instance><instance number>_<host name>) defines parameters that apply for one instance, such as the number and type of work processes, or the definition of the size and allocation of the main memory area used by the Sap system.




Number of instance is equal to instance profiles


Sequence to start up the SAP system:

1. Start porfile
   
2. Default profile
   
3. Instance profiles
   

If we need to change any profile values there is two ways :

1. OS level:
   

In OS level go to \usr\sap\<SID>\SYS\profile path and find the all profiles in this path. Now is we want change any profile open with note pad and change value if require and save. Before change values take backup of profile.

2. SAP level:
   

In sap level we have two T-codes for changing values there are RZ10 and RZ11.
Before going to do this we need to know about parameters.


Parameter are two types :

1. Static Parameters: When ever we can change a static parameter value we need restart the SAP system. It is perment change in Sap and it will be done using RZ10 only.
   

2. Dynamic Parameters: When ever we can change dynamic parameter values we don't need restart the sap system,when we restart goes back to privious values . It will be change in RZ11 and RZ10 also.