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Unraveling the Secrets of SAP Directories and Parameters in Default.PFL

This list will be updated on demand and need basis , Drop a comment and it will be added.


Directories:

  1. DIR_HOME: Directory for the home folder of the SAP system.
  2. DIR_EXECUTABLE: Directory for SAP executable programs.
  3. DIR_TRANS: Directory for the transport files.
  4. DIR_GLOBAL: Directory for global data files.
  5. DIR_PROFILE: Directory for the SAP profiles.
  6. DIR_INSTANCE: Directory for instance-specific files.
  7. DIR_PAG: Directory for page files.
  8. DIR_GTP: Directory for global temporary page files.
  9. DIR_REORG: Directory for reorganization files.
  10. DIR_DUMP: Directory for system dump files.
  11. DIR_WORK: Directory for work files.
  12. DIR_DATA: Directory for data files.
  13. DIR_LOG: Directory for log files.

Parameters:

  1. INSTANCE_NAME:

    • Description: Name of the SAP instance.
    • Trade-off: Changing the instance name can impact system identification and require updates to related system configurations.
  2. SAPSYSTEMNAME:

    • Description: Name of the SAP system.
    • Trade-off: Modifying the SAP system name can affect system identification and require adjustments to related configurations.
  3. SAPGLOBALHOST:

    • Description: Hostname of the SAP system.
    • Trade-off: Changing the SAP global host can impact system connectivity and require updates to related network and system configurations.
  4. DIR_CT_RUN:

    • Description: Directory for control and work files.
    • Trade-off: Modifying this directory affects the location of control and work files and may require updates to related system configurations.
  5. DIR_EPS_ROOT:

    • Description: Directory for EPS (External Program Storage) files.
    • Trade-off: Changing this directory impacts the storage location of EPS files and may require adjustments to related system settings.
  6. DIR_HOME_PROG:

    • Description: Directory for home executables.
    • Trade-off: Modifying this directory affects the location of home executables and may require updates to related system configurations.
  7. DIR_HOME_LOG:

    • Description: Directory for home log files.
    • Trade-off: Changing this directory impacts the storage location of home log files and may require adjustments to related system settings.
  8. rdisp/mshost:

    • Description: Message server host.
    • Trade-off: Modifying the message server host affects the communication between application servers and clients, and requires updates to related network and system configurations.
  9. rdisp/msserv:

    • Description: Message server service.
    • Trade-off: Changing the message server service can impact the communication between application servers and clients and requires updates to related configurations.
  10. rdisp/wp_no_dia:

    • Description: Number of dialog work processes.
    • Trade-off: Increasing this parameter allows for more simultaneous dialog processes, improving system responsiveness. However, it consumes more system resources, so careful monitoring is necessary to ensure optimal performance.
  11. rdisp/wp_no_btc:

    • Description: Number of background work processes.
    • Trade-off: Increasing this parameter enables more simultaneous background processes, facilitating efficient execution of background jobs. However, excessive background processes can result in resource contention and affect system performance.
  12. rdisp/wp_no_enq:

    • Description: Number of enqueue work processes.
    • Trade-off: Increasing this parameter enhances lock management and improves system concurrency. However, it consumes additional resources, so it should be adjusted based on system requirements and workload.
  13. abap/heap_area_total:

    • Description: Total heap memory available for ABAP.
    • Trade-off: Increasing this parameter expands the overall heap memory available for ABAP programs, allowing for larger memory allocations. This can benefit memory-intensive processes but may require additional system resources.
  14. abap/heap_area_dia:

    • Description: Heap memory available for ABAP dialog processes.
    • Trade-off: Increasing this parameter allocates more heap memory specifically for dialog processes, facilitating better performance for interactive tasks. However, excessive allocation can lead to higher memory consumption.
  15. abap/heap_area_nondia:

    • Description: Heap memory available for ABAP non-dialog processes.
    • Trade-off: Increasing this parameter reserves more heap memory for non-dialog processes, such as background jobs, optimizing performance for non-interactive tasks. However, it may impact memory utilization.
  16. icm/host_name_full:

    • Description: Full hostname of the SAP system for ICM (Internet Communication Manager).
    • Trade-off: Modifying this parameter affects the hostname used by the ICM for communication. It is essential to ensure the correct hostname is specified to establish proper connectivity with external systems.
  17. icm/server_port_<n>: Description: Specifies the port number for a particular ICM server. The parameter <n> represents the server instance number. Each ICM server instance requires a unique port number for communication. Trade-off: Choosing the appropriate port number for the ICM server involves balancing security and accessibility. Lower port numbers (e.g., well-known ports) may be more susceptible to unauthorized access or attacks. Higher port numbers provide more security but can be challenging to manage in complex network configurations.
  18. rdisp/max_alt_modes: Description: Defines the maximum number of alternative modes for a work process. Alternative modes are used to execute non-dialog tasks during peak load times. Each alternative mode represents an additional processing mode for the work process. Trade-off: Increasing the maximum number of alternative modes allows for better load distribution and can help handle higher workloads during peak periods. However, it also consumes additional system resources, such as memory and CPU, which may impact overall system performance.
  19. abap/buffersize: Description: Specifies the buffer size for ABAP programs. A larger buffer size can improve performance by reducing disk I/O operations. It determines the amount of data read from or written to disk in a single operation. Trade-off: Increasing the buffer size can enhance performance by reducing the frequency of disk I/O, which can be a significant bottleneck. However, it also increases the memory consumption of the SAP system, potentially affecting other processes and resource utilization.
  20. icm/keep_alive_timeout: Description: Determines the duration of an idle connection before it is closed by the ICM. This parameter helps manage resource utilization and connection availability. Idle connections consume system resources and can limit the availability of resources for other connections. Trade-off: Setting a shorter keep-alive timeout reduces the duration of idle connections, freeing up resources more quickly. However, it may also lead to more frequent connection establishment and teardown, which can increase overhead.
  21. rdisp/wp_ca_blk_no: Description: Sets the number of dialog work processes used as collision avoidance blocks. These work processes handle specific tasks related to lock management and concurrency control. They prevent multiple work processes from accessing the same data simultaneously, improving system stability and consistency. Trade-off: Allocating more work processes as collision avoidance blocks enhances system concurrency and reduces the likelihood of data conflicts. However, it also reduces the number of available work processes for executing user transactions, potentially impacting system responsiveness during peak load periods.
  22. ztta/roll_area: Description: Specifies the maximum size of the roll area, which is used for storing ABAP program data during execution. The roll area holds the data that exceeds the available memory space and is temporarily stored on disk. Trade-off: Increasing the size of the roll area allows for larger data storage during program execution, reducing the frequency of disk I/O operations. However, it also consumes more memory resources, potentially impacting the overall system performance and available memory for other processes.
  23. rdisp/plugin_auto_logout: Description: Controls the automatic logout behavior for SAP GUI users who are inactive for a specified period of time. When enabled, users who remain inactive for the defined duration are automatically logged out of the SAP system. Trade-off: Enabling the automatic logout feature enhances system security by reducing the risk of unauthorized access to an active user session. However, it may inconvenience users who may need to frequently re-login if they have prolonged periods of inactivity.
  24. gw/acl_mode: Description: Determines the access control mode for the SAP Gateway. It defines how clients are authenticated and authorized to access SAP system resources. Different ACL (Access Control List) modes provide varying levels of security and control. Trade-off: Selecting the appropriate ACL mode depends on the specific security requirements of the SAP system. More restrictive ACL modes provide stronger access control but may also require more administrative effort to manage and maintain authorized client access.
  25. abap/heap_area_nolimit: Description: When set to TRUE, removes the limit on the heap memory available for ABAP programs. This allows ABAP programs to use memory without restrictions. Trade-off: Removing the heap memory limit can provide flexibility for memory-intensive processes and prevent memory-related errors. However, it also increases the risk of memory exhaustion and potential performance degradation if programs utilize excessive memory.
  26. icm/HTTP/logging_0: Description: Configures the HTTP logging level for the ICM. It determines the level of detail captured in the log files, helping with troubleshooting and monitoring. Trade-off: Increasing the logging level provides more detailed information in the log files, facilitating thorough analysis and troubleshooting. However, it also increases the volume of log data, potentially impacting disk space usage and log file management.

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