DBA Log Switches

Description:

None

Parameters

Used tables

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

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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
IBY Payment Process Request Details	GMI Cycle Count Forms
Public Sector Financials	Shipping Execution
PSA Budgetary Control Transactions	WSH Shipping/Delivery Transactions
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OKS Service Contracts Billing History OKS Service Contracts Billing Schedule	AD Applied Patches AD Applied Patches 11i AD Applied Patches R12.2
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Order Management	Work in Process
ONT Cancelled Orders ONT Order Holds ONT Orders ONT Orders and Lines ONT Recurring Billing Plan ONT System Parameters ONT Transaction Types Listing ONT Transaction Types and Line WF Processes	WIP Account Distribution WIP Discrete Job Shortage WIP Entities WIP Entities Summary WIP Outside Processing WIP Required Components WIP Value WIP Value Summary
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CE Bank Account Balances CE Bank Branches CE Bank Statement Import Execution CE Bank Statement and Reconciliation CE Bank Transaction Codes Listing CE Cash in Transit CE Cleared Transactions CE General Ledger Cash Account Usage CE General Ledger Reconciliation CE Transactions Available for Reconciliation	CST AP and PO Accrual Reconciliation CST COGS Revenue Matching CST Cost Groups CST Detailed Item Cost CST Inventory Value - Multi-Organization (Element Costs) 11i CST Inventory Value - Multi-Organization (Item Costs) CST Inventory Value Report - by Subinventory (Item Cost) CST Item Cost Reports CST Miscellaneous Accrual Reconciliation CST Period Close Subinventory Value CST Period Close Subinventory Value Summary CST Periodic Inventory Value CST Supply Chain Indented Bills of Material Cost CST Uninvoiced Receipts
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Application Object Library	Database Administration
FND Application Context File FND Applications FND Attached Documents FND Attachment Functions FND Audit Setup FND Audit Table Changes by Column FND Audit Table Changes by Record FND Concurrent Managers FND Concurrent Program Incompatibilities FND Concurrent Programs and Executables FND Concurrent Programs and Executables 11i FND Concurrent Request Conflicts FND Concurrent Requests FND Concurrent Requests 11i FND Concurrent Requests Summary FND Data Groups FND Descriptive Flexfield Table Columns FND Descriptive Flexfields FND Document Categories FND Document Sequence Assignments FND Document Sequences FND FNDLOAD Object Transfer FND Flex Hierarchies (Rollup Groups) FND Flex Value Hierarchy FND Flex Value Security Rules FND Flex Value Sets, Usages and Values FND Flex Values FND Form Functions FND Forms Personalizations FND Help Documents and Targets FND Histogram Columns FND Key Flexfields FND Languages FND Lobs FND Log Messages FND Lookup Search FND Lookup Values FND Lookup Values Comparison between environments FND Menu Entries FND Messages FND Nodes FND Profile Option Values FND Profile Options FND Request Groups FND Responsibilities FND Responsibility Access FND Responsibility Access 11i FND Responsibility Menu Exclusions FND Role Hierarchy FND Roles FND Rollup Groups FND SOA Runtime Error FND Tables and Columns FND User Login History FND User Login Page Favorites FND User Login Summary FND User Responsibilities FND User Roles FND User Roles 11i FND Users	DBA AWR Active Session History DBA AWR Blocking Session Summary DBA AWR CPU Load (active session history) DBA AWR CPU vs Wait Time Summary DBA AWR Interconnect Traffic DBA AWR Latch Summary DBA AWR Latch by Time DBA AWR PGA History DBA AWR SQL Execution Plan History DBA AWR SQL Performance Summary DBA AWR Settings DBA AWR System Metrics Summary DBA AWR System Time Percentages DBA AWR System Time Summary DBA AWR Tablespace Usage DBA AWR Wait Class by Time DBA AWR Wait Event Summary DBA AWR Wait Event Summary (active session history) DBA Alert Log DBA Archive / Redo Log Rate DBA Automated Maintenance Tasks DBA Blocking Sessions DBA CPU Benchmark1 DBA CPU Benchmark2 DBA CPU Benchmark3 DBA Dependencies (used by) DBA Dependencies (uses) DBA Editioned Object Summary DBA Editions DBA External Table Creation DBA Feature Usage Statistics DBA Hierarchical Profiler Data DBA Index Columns DBA Jobs DBA Log Switches DBA Objects DBA Parameters DBA Profiler Data DBA Redo Log Files DBA Registry SQL Patch DBA Result Cache Objects and Dependencies DBA Result Cache Statistics DBA SGA Active Session History DBA SGA Blocking Session Summary DBA SGA Buffer Cache Object Usage DBA SGA CPU Load (active session history) DBA SGA Memory Allocation DBA SGA SQL Execution Plan History DBA SGA SQL Performance Summary DBA SGA Target Advice DBA SGA Wait Event Summary (active session history) DBA SGA+PGA Memory Configuration DBA Scheduler Jobs DBA Segments DBA Session Longops DBA Table Columns DBA Table Modifications DBA Tablespace Usage DBA Text Search DBA Trace File Contents