RAC Performance Monitoring and Diagnosis using Oracle Enterprise Manager. Kai Yu Senior System Engineer Dell Oracle Solutions Engineering

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1 RAC Performance Monitoring and Diagnosis using Oracle Enterprise Manager Kai Yu Senior System Engineer Dell Oracle Solutions Engineering

2 About Author Kai Yu Senior System Engineer, Dell Oracle Solutions Engineering Lab 15 years Oracle DBA and Solutions Engineering Specialized in Oracle RAC, Oracle EBS and OVM Oracle ACE Director Oracle Technology article author and frequent presenter at OOW and Collaborate conferences IOUG Oracle RAC SIG President Owner of IOUG RAC Tuning BootCamp

3 Agenda Database Performance Monitoring & Diagnosis Tools RAC Performance Monitoring and Diagnosis Monitoring & Diagnosis with Enterprise Manager Examples of RAC Performance Monitoring & Diagnosis QA

4 Database Performance Monitoring & Diagnosis Database Performance Statistics Gathering: Oracle generates cumulative performance statistics Dynamic Performance Views: v$views, gv$views: Automatic Workload Repository: AWR snapshot of statistics on period of times. Active Session history samples current state of all active sessions Database Performance tuning Tools. Oracle Database 11g : clustered or single node database Oracle Diagnostic Pack: Automatic Workload Repository(AWR): AWR snapshot, AWR report Automatic Database Diagnostic Monitor (ADDM) Active Session History (ASH) Enterprise Manager: Database Control and Grid control

5 RAC Performance Monitoring and Diagnosis Multiple Levels: clusterware, cluster database, Instances All single node database performance statistics apply to RAC RAC specific performance statistics: Cluster cache coherency, Global Cache Block Access Latency: Interconnect RAC Wait events: cluster waits: Performance Monitoring & Diagnosis tools for RAC AWR captures data from all active instances of RAC ADDM presents data in cluster wide perspective ASH reports statistics for all active sessions of all active instances Enterprise manager is RAC aware

6 Monitoring & Diagnosis with Enterprise Manager Enterprise manager provides: Web based integrated management solutions, preferred method Integrated AWR, ADDM, ASH: execution and viewing results. Monitoring RAC performance on Cluster, Database &Instances Automatic Monitoring vs Real Time Monitoring Performance monitoring and diagnosis: Proactive performance monitoring and tuning vs Reactive tuning. Monitoring performance over period of time vs diagnose shortlived performance issue.

7 Monitoring & Diagnosis with Enterprise Manager Cluster Database Home: Cluster status & alerts, ADDM findings/analysis

8 Monitoring & Diagnosis with Enterprise Manager Cluster Database Performance Page:Host Load, Global Cache Block Access Latency, Average Active Sessions,throughput

9 Monitoring & Diagnosis with Enterprise Manager Throughput, I/O, etc and additional monitoring links

10 Monitoring & Diagnosis with Enterprise Manager Cluster Cache Coherency Page:

11 Monitoring & Diagnosis with Enterprise Manager Cluster Instance: Instance status & alerts, ADDM findings/analysis

12 Monitoring & Diagnosis with Enterprise Manager Cluster Database Instance Performance Page: real time & historical statistics & ADDM and ASH

13 Monitoring & Diagnosis with Enterprise Manager Cluster Home: Cluster status & alerts, health and workload the cluster

14 Monitoring & Diagnosis with Enterprise Manager Cluster Performance: CPU, Memory, Disk I/O of hosts

15 Monitoring & Diagnosis with Enterprise Manager Interconnect performances

16 Example of RAC Performance Monitoring & Diagnosis Environment 8 node RAC database testdb1 Workload: run PL/SQL script update.sql. Loop for times: select rows of customer table(most copy in other node) update rows to establish the master copy in local node. Insert into customer table using sequence value end loop workload.sh: executes update.sql on all 8 instances at same time Goal Monitor real time performance; diagnose performance issue using historical data Examples of using ADDM, ASH, AWR snapshots in EM

17 Examples of RAC Performance Monitoring & Diagnosis First Run:

18 Examples of RAC Performance Monitoring & Diagnosis Run ADDM

19 Examples of RAC Performance Monitoring & Diagnosis High CPU usage High Cluster Wait

20 Examples of RAC Performance Monitoring & Diagnosis ADDM Tuning Recommendation Implementation: Create an Index on customer table

21 Examples of RAC Performance Monitoring & Diagnosis Second Run

22 Examples of RAC Performance Monitoring & Diagnosis Real Time Monitoring: ADDM Findings

23 Examples of RAC Performance Monitoring & Diagnosis ADDM Tuning Recommendations

24 Examples of RAC Performance Monitoring & Diagnosis ADDM Tuning Recommendations

25 Examples of RAC Performance Monitoring & Diagnosis Third Run: implementing recommendations: alter system set gcs_server_processes = 4 scope = spfile; recreate the sequence by setting cache value 9000

26 Example of RAC Performance Monitoring & Diagnosis Performance Comparisons of three Runs: Throughputs: transactions/sec 1 st : nd : rd : 7000

27 Examples of RAC Performance Monitoring & Diagnosis Performance Comparisons of three runs: Time to complete the tests (mins) Instance# Instance# 1st Run 2nd Run 3 Run Summary: Use EM to monitor and diagnose the RAC database performance Identified the root cause of major waiting time and recommended the tuning solution: improve the performance more than 10times each SQL and database objects tuning can reduce cluster wait time and CPU time.

28 QA

29 Thank you Please complete the survey Speaker: Kai Yu, Title: RAC Performance Monitoring and Diagnosis using Enterprise Manager, #Q354, Visit my Oracle blog:

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