DBA AWR Latch by Time

Description:

Latch contention wait time history. Each row shows the system-wide latch contention wait time per latch name of one AWR snapshot interval to identify high latch contention at specific times.

Parameters

Date From, Date To, 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 by Time 26-Nov-2018 201456.xlsx

Report SQL

www.enginatics.com/reports/dba-awr-latch-by-time/

Blitz Report™ import options

DBA_AWR_Latch_by_Time.xml

Executive Summary

The DBA AWR Latch by Time report analyzes low-level serialization mechanisms called “Latches”. Unlike locks (which protect data), latches protect memory structures in the SGA (System Global Area). High latch contention indicates that too many processes are trying to access the same memory structure simultaneously, leading to CPU spikes and “spinning”. This report tracks latch wait times over time.

Business Challenge

CPU Spikes: Latch contention often manifests as high CPU usage because processes “spin” (burn CPU) while waiting for a latch.
Concurrency Bottlenecks: Identifying specific times when memory access becomes a bottleneck (e.g., “Cache Buffers Chains” latch during a batch run).
Scalability Limits: Latch contention is often the limiting factor in how many concurrent users a system can support.

Solution

This report shows the wait time for each latch type per AWR snapshot.

Key Features:

Time-Series View: Shows how latch contention evolves over the day.
Latch Identification: Identifies the specific latch name (e.g., “shared pool”, “library cache”).

Architecture

The report queries DBA_HIST_LATCH.

Key Tables:

DBA_HIST_LATCH: Historical latch statistics.
DBA_HIST_SNAPSHOT: Snapshot timing.

Impact

Deep Tuning: Helps DBAs diagnose complex internal contention issues that standard SQL tuning cannot fix.
Application Design: Can point to design flaws (e.g., lack of bind variables causing “library cache” latch contention).
System Health: Ensures the internal memory management mechanisms are functioning smoothly.

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.

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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