DBA SGA Wait Event Summary (active session history) – Oracle EBS SQL Report
Oracle E-Business Suite SQL report from the Enginatics Library powered by Blitz Report™.
Overview
Wait event and CPU usage summary from the SGA active session history.
Report Parameters
From Time, To Time, By Instance, By Event, Session Type
Oracle EBS Tables Used
Report Categories
Related Reports
DBA SGA Blocking Session Summary, DBA AWR Blocking Session Summary, DBA AWR Active Session History, DBA SGA CPU Load (active session history), DBA SGA Active Session History, Blitz Report History, DBA SGA SQL Performance Summary, DBA Blitz Report ORDS Configuration, DBA ORDS Configuration Validation
Running This SQL Without Blitz Report
Some Oracle EBS SQL reports in this library require functions from the utility package xxen_util. Install it before running the SQL directly against your Oracle EBS database.
Download & Import Options
| Resource | Link |
|---|---|
| Excel Example Output | DBA SGA Wait Event Summary (active session history) 23-Sep-2025 105219.xlsx |
| Blitz Report™ XML Import | DBA_SGA_Wait_Event_Summary_active_session_history.xml |
| Full SQL on Enginatics | www.enginatics.com/reports/dba-sga-wait-event-summary-active-session-history/ |
Case Study & Technical Analysis
Abstract
The DBA SGA Wait Event Summary (active session history) report aggregates wait event data from the in-memory ASH buffer to provide a “Top Wait Events” profile for the immediate past. Unlike the standard AWR “Top 5 Timed Events,” which covers a full hour, this report can be scoped to the last 5, 10, or 30 minutes, providing high-resolution visibility into transient performance spikes.
Technical Analysis
Core Logic
- Aggregation: Sums the number of active session samples for each
EVENT(orWAIT_CLASS). - Time Basis: Since ASH samples once per second, the count of samples roughly equates to “seconds spent waiting” (DB Time).
- CPU vs. Wait: Clearly distinguishes between time spent on CPU (working) versus time spent waiting for resources (I/O, locks, latches).
Key View
GV$ACTIVE_SESSION_HISTORY: The source of the wait event samples.
Operational Use Cases
- Incident Response: During a slowdown, running this report for the “Last 10 Minutes” immediately reveals if the bottleneck is I/O (
db file sequential read), Concurrency (enq: TX), or CPU. - Load Profiling: Understanding the “personality” of the workload (e.g., is it read-intensive or commit-intensive?).
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