DBA AWR Interconnect Traffic
Description:
Displays information about the usage of an interconnect device by instance in a RAC configuration.
ipq - Parallel query communications dlm - Database lock management cache - Global cache communications
All other values are internal to Oracle and are not expected to have high usage.
Parameters
Date From, Date To, Name, Diagnostic Pack enabled, Container Data
Used tables
dba_hist_snapshot, dba_hist_ic_client_stats
Categories
Related reports
DBA SGA+PGA Memory Configuration
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 Interconnect Traffic 24-Aug-2024 132126.xlsx
Report SQL
www.enginatics.com/reports/dba-awr-interconnect-traffic/
Blitz Report™ import options
DBA_AWR_Interconnect_Traffic.xml
Executive Summary
The DBA AWR Interconnect Traffic report is essential for managing Oracle Real Application Clusters (RAC). In a RAC environment, instances communicate over a private high-speed network (the Interconnect) to share data blocks and manage locks. If this network becomes congested, the entire cluster’s performance suffers. This report monitors the traffic across this critical link.
Business Challenge
- RAC Scalability: “Why does adding a node make the application slower?” (Often due to excessive interconnect traffic).
- Application Design: Identifying “Chatty” applications that constantly move data blocks between instances (Global Cache Transfer).
- Network Sizing: Verifying if the private network bandwidth is sufficient for the workload.
Solution
This report displays traffic statistics for the interconnect.
Key Features:
- Traffic Types: Breaks down traffic by category:
ipq: Parallel Query (often high bandwidth).dlm: Distributed Lock Manager (locking coordination).cache: Global Cache (block transfers).
- Instance View: Shows traffic per instance.
Architecture
The report queries DBA_HIST_IC_CLIENT_STATS.
Key Tables:
DBA_HIST_IC_CLIENT_STATS: Interconnect statistics history.
Impact
- Cluster Stability: Prevents node evictions caused by interconnect saturation.
- Performance Tuning: Highlights the need for “Application Partitioning” (keeping related data on the same node) to reduce traffic.
- Infrastructure Validation: Confirms that the network hardware is performing as expected.
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