OVERVIEW FOR TRANSACTIONS USED IN PERFORMANCE ANALYSIS,PLEASE CHECK SAP NOTE: 948066 - Performance Analysis: Transactions to use.
Workload Monitoring - ST03/ST03N
You can find more information about Workload Monitor from : Help portal Workload Monitor.
Snapshot Monitoring - SMON
SMON allows for the periodic collection of performance data such as CPU utilization, memory, work process utilization and samples, request queue lengths, and more.
Learn how to configure and schedule SMON: SAP Note 2651881 - How to configure SMON for performance monitoring and analysis
For other information related to SMON, see All About SMON
SMON replaces the older snapshot tool /SDF/MON. We recommend using SMON when possible.
For information on /SDF/MON see SAP Note 2383809 - "How to use the SDF/MON tool to analyse performance issues"
ABAP Performance Trace - ST12
ST05
2482775 - Optimizing Expensive SQL Statements - Guided Answers |
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SE30 and SAT
2327539 - How to create a SE30 Trace for Web Dynpro ABAP Application [VIDEO] |
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STAD - Business Transaction Analysis
Other useful tools and reference