DBA Log Switches – Oracle EBS SQL Report
Oracle E-Business Suite SQL report from the Enginatics Library powered by Blitz Report™. Oracle EBS module: Database Administration · all Database Administration reports
Overview
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Report Parameters
None
Oracle EBS Tables Used
Report Categories
Related Reports
DBA Archive / Redo Log Rate, FND Concurrent Requests, DBA Redo Log Files, DBA SGA Active Session History, DBA SGA Blocking Session Summary, DBA AWR Blocking Session Summary, DBA SGA Wait Event Summary (active session history), DBA AWR Active Session History, DBA SGA CPU Load (active session history)
Running This SQL Without Blitz Report
The SQL source can be run in any SQL client. Some Oracle EBS SQL reports in this library use functions from the utility package xxen_util – install it first. Blitz Report™ adds parameters, Excel output with pivots, scheduling and security on top.
Download & Import Options
| Resource | Link |
|---|---|
| Excel Example Output | DBA Log Switches 27-Apr-2024 202922.xlsx |
| Blitz Report™ XML Import | DBA_Log_Switches.xml |
| SQL Source | DBA Log Switches.sql |
| Full Report on Enginatics | www.enginatics.com/reports/dba-log-switches/ |
Executive Summary
The DBA Log Switches report tracks the frequency of Redo Log switches. In an Oracle database, every change is written to the Redo Log. When a log file fills up, a “Log Switch” occurs, and the database moves to the next file. Frequent switching (e.g., every 2 minutes) causes “Checkpoint” storms, where the database freezes while flushing dirty blocks to disk.
Business Challenge
- Performance Stalls: “Why does the system freeze for 10 seconds every few minutes?”
- Sizing: “Are our 1GB redo logs too small for the current transaction volume?”
- Peak Load Analysis: “At what time of day do we generate the most redo (i.e., do the most inserts/updates)?”
Solution
This report lists the time of each log switch.
Key Features:
- Switch Time: The exact timestamp of the switch.
- Frequency: Allows calculation of the interval between switches.
- Thread: In RAC environments, shows which instance performed the switch.
Architecture
The report queries GV$LOG_HISTORY.
Key Tables:
GV$LOG_HISTORY: Historical log switch data.
Impact
- Tuning: Helps DBAs size redo logs correctly (Oracle recommends switching no more than once every 15-20 minutes).
- IO Stability: Reducing switch frequency smooths out the I/O load on the storage subsystem.
- Archiver Health: Ensures the Archiver process (ARCn) can keep up with the generation of redo logs.
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