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Executive Summary

The DBA Parameters report audits the database initialization parameters (init.ora / spfile). These parameters control every aspect of the database's behavior, from memory allocation (sga_target) to optimizer behavior (optimizer_features_enable). Incorrect parameters are a leading cause of performance issues and instability.

Business Challenge

  • Standardization: "Does our Production database have the same parameters as our Test database?"
  • Performance Tuning: "Is cursor_sharing set to EXACT or FORCE?"
  • Change Tracking: "Who changed open_cursors from 1000 to 500?"

Solution

This report lists the current value of all database parameters.

Key Features:

  • Is Default: Indicates if the parameter is set to its default value or has been overridden.
  • Is Modified: Shows if the parameter was changed in the current session.
  • RAC Consistency: In a RAC environment, checks if parameters are consistent across all instances.

Architecture

The report queries GV$PARAMETER.

Key Tables:

  • GV$PARAMETER: The in-memory view of active parameters.

Impact

  • Stability: Prevents "drift" where configuration changes are made in one environment but not others.
  • Best Practices: Allows DBAs to validate settings against Oracle Support recommendations (e.g., "bde_chk_cbo.sql").
  • Troubleshooting: Quickly rules out misconfiguration as the cause of a new issue.