Debugging, Profiling and Performance

Apex ProgrammingDebugging, Profiling and PerformanceFind bugs and bottlenecks in Apex with debug logs, trace flags, the Developer Console, Apex Replay Debugger and the CLI, then make code faster and leaner: CPU and heap optimization, SOQL selectivity, Platform Cache, ApexGuru and production monitoring.Advanced · about 75 minutesWhat you will learn

Configure debug levels and trace flags and read debug logs efficiently

Use the Developer Console log inspector, Execution Overview and Query Plan tool

Debug with Apex Replay Debugger and stream logs with sf apex tail log

Instrument code with the Limits class and optimize CPU time and heap usage

Diagnose non-selective SOQL and know when to request custom indexes or skinny tables

Cache data across transactions with Platform Cache and Cache.CacheBuilder

Monitor production with Apex exception emails, Event Monitoring and ApexGuru

Contents

A debugging workflow

Debug logs

Developer Console

Apex Replay Debugger

Logs from the command line

A System.debug strategy

Instrumenting with the Limits class

Optimizing CPU time

Optimizing heap

SOQL performance

Platform Cache

ApexGuru and Scale Center

Monitoring production

Worked example: profiling a slow trigger

Performance checklist

Best practices

Common pitfalls

Hands-on exercises

Key takeaways