CockroachDB has enhanced its admission control and resource allocation mechanisms to better manage database performance under load, particularly in multi-node transactional databases. The improvements involve hybrid token and slot-based allocation systems that dynamically adjust for CPU and storage resources, along with mechanisms for multi-tenant performance isolation and priority adjustment to minimize priority inversion. CockroachDB addresses challenges like CPU and storage bottlenecks by intercepting CPU-bound work and implementing dynamic slot and token calculation, while an epoch-LIFO queueing system helps manage transaction deadlines. These enhancements shift queuing from the CPU scheduler to admission control queues, maintaining high CPU utilization and reducing latency for high-priority tasks. The system also supports fair resource allocation among tenants and adapts queueing strategies based on observed delays, improving throughput and preventing node failures during overload.