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Usage of SM18, SM19, SM20, and SM21 in SAP

Updated Aug 12, 2023

SAP provides a set of tools and transaction codes that facilitate system monitoring, error analysis, and security management. Among these tools are SM18, SM19, SM20, and SM21, each serving a unique purpose in enhancing SAP system performance, security, and troubleshooting.

1. SM18 - Administration of Security Audit Log

SM18 is a transaction code within SAP that deals with the administration of the Security Audit Log. The Security Audit Log records system events and changes, helping administrators monitor and analyze activities that occur within the system. It plays a critical role in tracking security-related events, such as user logins, authorizations, and sensitive data access.

Features and Benefits:

  • Captures critical security-related events.
  • Helps in identifying potential unauthorized activities.
  • Supports compliance with regulations and internal security policies.
  • Enables forensic analysis in case of security incidents.

2. SM19 - Security Event Analysis

SM19 is a transaction code that allows SAP administrators to analyze security-related events recorded in the Security Audit Log (SM18). It provides a comprehensive view of system activities and helps identify patterns or anomalies that might indicate unauthorized access or breaches.

Features and Benefits:

  • Filters and displays security events based on various criteria.
  • Supports real-time monitoring and historical analysis.
  • Facilitates quick identification of security incidents.
  • Aids in improving overall system security.

3. SM20 - Analysis of Security Audit Log for Different Clients

SM20 is a tool that provides analysis capabilities for the Security Audit Log, allowing administrators to monitor events across different clients within the SAP system. This is particularly useful in multi-client environments where distinct clients may have varying security requirements.

Features and Benefits:

  • Offers a consolidated view of security events across multiple clients.
  • Allows administrators to compare security activities between clients.
  • Enhances the ability to detect cross-client security breaches.

4. SM21 - System Log

SM21 is a transaction code that provides access to the SAP system log, also known as the system log viewer. The system log contains information about various system-level events, errors, warnings, and messages generated by SAP applications and processes.

Features and Benefits:

  • Offers insights into system health and performance.
  • Facilitates quick identification and resolution of issues.
  • Provides details about application-specific and system-wide errors.
  • Supports proactive system maintenance.


Efficient system monitoring, error analysis, and security management are essential for maintaining the stability and security of SAP environments. SM18, SM19, SM20, and SM21 are valuable tools provided by SAP that enable administrators to monitor security-related events, analyze logs, and troubleshoot issues effectively. Using these SAP tools not only enhances the overall performance and security of SAP systems but also contributes to maintaining a well-functioning environment in line with organizational goals.