Concurrent Executions: 100 Run Command per account
Session Manager: 100 concurrent sessions
Automation: 100 concurrent executions
Parameter Store Limits
Standard: 10,000 parameters, 4KB size
Advanced: 100,000 parameters, 8KB size
API Rate: 1,000 TPS (higher tier: 10,000 TPS)
Versions: 100 versions per parameter
Run Command
100 concurrent executions
50 targets per command
48 hours max duration
2,400 commands/sec rate
Patch Manager
500 patch baselines
50 patch groups
5 maintenance windows
50 targets per window
Automation
100 concurrent executions
500 documents per account
1,000 steps per document
48 hours max duration
Session Manager
100 concurrent sessions
60 minutes idle timeout
20 hours max duration
S3 log size: 5GB/session
Pricing Overview
Free
EC2 Instances
Most SSM features free for EC2
$0.00695
On-Premises/Month
Per managed instance
$0.002
Automation Step
Per step execution
Monitoring
CloudWatch metrics included
CloudTrail logging free
Standard CloudWatch charges
S3 storage charges apply
Regional
Available in all commercial regions
GovCloud support
China regions supported
Regional service limits
Quota Increases
Request via Service Quotas
Most limits are adjustable
Approval typically within days
Document business justification
Exam Strategy Tip
Remember: Most SSM features are free for EC2 instances. 50,000 managed instances per account/region. Parameter Store Standard tier is free with 10,000 parameters. On-premises instances cost $0.00695/month.