Like hardware hosts, virtual hosts in public and private clouds can develop resource bottlenecks as workloads increase. If you are using and managing InterSystems IRIS instances deployed in public or private clouds, you may have encountered a situation in which addressing performance or other issues requires increasing the capacity of an instance's host (that is, vertically scaling).
One common reason to scale is insufficient memory. As described in Memory Management and Scaling for InterSystems IRIS in the Scalability Guide, providing enough memory for all of the entities running on the host







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