44. Real Time ADDM - Challenges
Sick Systems
Database is very slow
All user queries are very slow
Performance Screens show slow data refresh rates
There is significant reduction in throughput
Database is hung due to internal contention for resources
Database is totally unresponsive; no logon is allowed.
User queries are hanging
Performance screens do not refresh
DBA is unable to logon to the instance because it is hung state
DBA did not find the blocking session to kill, Emergency Monitoring did not
provide the root cause
45. Real Time ADDM - Goals
With 12c One can Switch to Real-Time ADDM before bouncing the instance
starts collecting performance data from all database instances
Analyzed recent data for systems paralyzed becuase of severe contention on
local or global resources
Provides holistic analysis for systems experiencing unusally high database activity
Detects findings for the recent activity(past 10 minutes)
Offers actionable recommendations
Use the recommendation to solve
Return back to regular performance monitoring
Note: Can be invoked for RAC environment