What's changed: Created AZ-120 Chapter 4 (Domain 4 first-half: performance/cost optimization (Azure Advisor recommendations, VM resizing, Reserved Instances vs Savings Plans, storage cost, archiving); network and app/DB optimization (Azure Network Watcher for latency/throughput, proximity/Accelerated Networking/VM size, app-server horizontal/vertical scaling, DB tuning, continuous-improvement cycle)).
4.1Optimizing performance and cost
Understand Azure Advisor performance/cost recommendations, Azure Savings Plans and Reserved Instances, VM resizing, storage cost optimization, and data optimization via archiving.
SAP runs on large VMs and high-performance storage, so costs are significant and workloads vary. Continuously optimize both performance and cost.
4.1.1Azure Advisor and VM resizing
Azure Advisor gives cost/performance/reliability/security recommendations from real telemetry (e.g., resize unused/oversized VMs, suggest reservations). If an SAP VM is over/under-sized, right-size it via VM resizing (within SAP-certified SKUs)—oversize costs money, undersize risks performance/support. Reduce storage cost by revisiting disk type/size and deleting unneeded snapshots. Think "list usage-based optimization recommendations" = Azure Advisor; "right-size the VM" = VM resizing.
4.1.2Commitment discounts and archiving
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