Performance Troubleshooting from Performance Tester Perspective !

Performance Troubleshooting using 1) Jvisualvm 2) MAT 3) JMC

by Tobias Geyer

1) MAT : Memory Analyzer Tool from IBM , to find out cause of out of memory

Lines to generate heap dump for your java program.

-XX:+HeapDumpOnOutOfMemoryError

-XX:HeapDumpPath=C:\heapdumps

2) Jvisualvm : Live Monitoring of java instance with CPU & memory utilization.

3) Java Mission Control : JMC : Capturing java profiling snapshot & analyze it. for more information please refer link : How to Produce Flight Recording

-XX:+UnlockCommercialFeatures

-XX:FlightRecorder

Comments

Explain Plan Vs Execution Plan

Explain Plan DELETE PLAN_TABLE EXPLAIN PLAN FOR SELECT COUNT(*) FROM ARADMIN80.T3293 WHERE ((((T3293.C230000009 = 'MAINCHANGE') AND ((T3293.C301813800 = '20001-Test') OR (T3293.C1000000337 = '20001-Test')) AND (T3293.C1000003561 >= 1) AND (T3293.C1000003561 <= 9)) OR ((T3293.C230000009 = 'MAINHELPDESK') AND (T3293.C301813800 = '20001-Test') AND (T3293.C1000003561 >= 0) AND (T3293.C1000003561 <= 3)) OR ((T3293.C230000009 = 'MAINWORKORDER') AND (T3293.C301813800 = '20001-Test') AND ((T3293.C1000003561 = 0) OR (T3293.C1000003561 = 1) OR (T3293.C1000003561 = 2) OR (T3293.C1000003561 = 3) OR (T3293.C1000003561 = 4))) OR ((T3293.C230000009 = 'MAINKNOWLEDGEDATABASE') AND (T3293.C301813800 = '20001-Test') AND (T3293.C1000003561 >= 4) AND (T3293.C1000003561 <= 4)) OR ((T3293.C230000009 = 'MAINKNOWNERROR') AND (T3293.C301813800 = '20001-Test') AND (T3293.C1000003561 >=...

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Linux Memory Usage

git clone https://github.com/pixelb/ps_mem.git cd ps_mem sudo ./ps_mem.py

Gorakshnath

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