DBA AWR Latch Summary

Description:

Summary of latch statistics such as misses and wait times for a specified snapshot time interval

Parameters

Date From, Date To, Level of Detail, Request Id (Time Restriction), Time Restriction, Diagnostic Pack enabled, Container Data

Used tables

dba_hist_snapshot, dba_hist_latch

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 AWR Latch Summary 26-Nov-2018 223201.xlsx

Report SQL

www.enginatics.com/reports/dba-awr-latch-summary/

Blitz Report™ import options

DBA_AWR_Latch_Summary.xml

Executive Summary

The DBA AWR Latch Summary report provides an aggregated view of latch statistics over a specified period. While the “Latch by Time” report shows trends, this report is useful for identifying the “Top N” latches causing the most pain overall. It summarizes misses, sleeps, and wait times to highlight the most contended memory structures.

Business Challenge

Top Contributors: “Which latch is responsible for 80% of our concurrency wait time?”
Tuning Prioritization: Deciding which area to focus on (e.g., Shared Pool vs. Buffer Cache) based on latch statistics.
Efficiency Analysis: High “Misses” but low “Sleeps” might indicate efficient spinning, whereas high “Sleeps” indicates severe contention.

Solution

This report aggregates latch statistics for the selected timeframe.

Key Features:

Gets: Number of times the latch was requested.
Misses: Number of times the latch was not obtained on the first try.
Sleeps: Number of times the process had to yield the CPU while waiting.
Wait Time: Total time spent waiting.

Architecture

The report queries DBA_HIST_LATCH.

Key Tables:

DBA_HIST_LATCH: Historical latch statistics.

Impact

Targeted Optimization: Focuses tuning efforts on the specific memory structures causing bottlenecks.
Configuration Tuning: Can suggest changes to initialization parameters (e.g., increasing SHARED_POOL_SIZE or DB_CACHE_SIZE) to relieve latch pressure.
Code Optimization: Helps identify application patterns (like hard parsing) that stress specific latches.

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.

Blitz Report Pivots

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.

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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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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