DBA Log Switches

DBA Log Switches

Description:

None

Parameters

Used tables

gv$log_history

Categories

Enginatics

Related reports

DBA Archive / Redo Log Rate, FND Concurrent Requests 11i

Dependencies

If you would like to try one of these Oracle EBS SQLs without having Blitz Report installed, note that some of the reports require functions from utility package xxen_util.

Example Report

DBA Log Switches 27-Apr-2024 202922.xlsx

Report SQL

www.enginatics.com/reports/dba-log-switches/

Blitz Report™ import options

DBA_Log_Switches.xml

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.

Oracle E-Business Suite Reporting Library

We provide an open source Oracle EBS SQLs as a part of operational and project implementation support toolkits for rapid Excel reports generation.

Blitz Report™ is based on Oracle EBS forms technology, and hence requires minimal training. There are no data or performance limitations since the output files are created directly from the database without going through intermediate file formats such as XML.

Blitz Report can be used as BI Publisher and Oracle Discoverer replacement tool. Standard Oracle BI Publisher and Discoverer reports can also be imported into Blitz Report for immediate output to Excel. Typically, reports can be created and version tracked within hours instead of days. The concurrent request output automatically opens upon completion without the need for re-formatting.

The Filters, Columns, Rows and Values fields are used to create and deliver the data in pivot table format with full drill down to details.

The Excel template upload functionality in Blitz Report allows users to create their own layouts by uploading an Excel template with additional sheets and charts, automatically refreshed when the report runs again. This allows to create custom dashboards and more advanced visualizations of report data.

You can download and use Blitz Report free of charge for your first 30 reports.

The installation and implementation process usually takes less than 1 hour; you can refer to our installation and user guides for specific details.

If you would like to optimize your Oracle EBS implementation and or operational reporting you can visit www.enginatics.com to review great ideas and example usage in blog. Or why not try for yourself in our demo environment.

Alert	CRM Foundation
ALR Alerts	JTF Grid Datasources
Contracts Core	Lease and Finance Management
OKC Contract Lines Summary	OKL Termination Quotes
Payments	Process Manufacturing Inventory
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