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Diagnostic Sources

Diagnostic Sources. Objectives. After completing this lesson, you should be able to do the following: Use various files for diagnostic purposes Alert Log Trace files Core files System logs Use Enterprise Manager to view alerts Adjust thresholds for tracked metrics

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Diagnostic Sources

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  1. Diagnostic Sources

  2. Objectives • After completing this lesson, you should be able to do the following: • Use various files for diagnostic purposes • Alert Log • Trace files • Core files • System logs • Use Enterprise Manager to view alerts • Adjust thresholds for tracked metrics • Control the size and location of trace files

  3. Diagnostic Files • The alert.log file • Trace files • Core dump files • System log files

  4. The Alert Log • The Alert Log contains: • All internal errors • Administrative operations, such as CREATE, ALTER, and DROP statements • Shared server errors • Materialized view refresh errors • Initialization parameter values

  5. What Is in the alert.log File • Every instance generates a file called alert.log, which logs the following information: • Diagnostic data from background and foreground processes • Summary information regarding errors and pointers to trace files for detailed information • Information since database creation (unless purged) that might be useful in backtracking a problem

  6. Viewing Recent Alert Log Entries

  7. Subscribingclients Thirdparty Alert Models Architecture Enterprise Manager Serveralertsqueue Oracle instance Metric exceeds threshold MMON AWR

  8. Server-Generated Alert Types Metric-based 97% Critical Cleared Threshold(stateful)alerts 85% Warning Cleared MMON DBA_OUTSTANDING_ALERTS DBA_ALERT_HISTORY Recovery Area Low On Free Space ResumableSessionSuspended SnapshotToo Old Nonthreshold (stateless)alerts Alert Event-based

  9. Viewing Alerts with Enterprise Manager • Alert General View

  10. Viewing Alerts with Enterprise Manager • Alert Details

  11. Alerts Notification

  12. Alert Log Monitoring Configuration

  13. Editing Thresholds

  14. Viewing Initialization Parameters

  15. Trace Files • Every server process, on encountering an exception, writes diagnostic data to a trace file • The trace file header contains the following information: • OS and version • Oracle version and options installed • Instance name • Process ID

  16. Specifying the Location of Trace Files • Initialization parameters controlling the location and size of trace files include: • BACKGROUND_DUMP_DEST • USER_DUMP_DEST • MAX_DUMP_FILE_SIZE

  17. Controlling Trace File Size • Using Enterprise Manager

  18. Controlling Trace File Writes • Trace files are usually generated by a server process upon encountering an error. • Some background processes like ARCn, have parameters that control the amount and type of trace information generated. • In some instances, trace files can be generated for server processes at user request. SQL> ALTER SESSION SET SQL_TRACE TRUE;

  19. Using Enterprise Manager to Enable and View SQL Tracing SQL> SELECT * FROM dba_enabled_traces;

  20. System Log Files • System log files capture error messages and exceptions encountered at the OS level • These would be useful if a hardware or OS problem is suspected

  21. Summary • In this lesson, you should have learned how to: • Use various files for diagnostic purposes • Alert Log • Trace files • Core files • System logs • Use Enterprise Manager to view alerts • Adjust thresholds for tracked metrics • Control the size and location of trace files

  22. Practice 6 Overview: Diagnosing Problems • These practices cover the following topics: • Setup server-generated alerts • Monitor server-generated alerts

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