Resource Management
Two managers, one question: who may use how much. Both are documented here from the source, including where each one falls short.
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Chapter 21.1
Resource Groups in Apache Cloudberry, Explained
How resource groups use cgroups to enforce real CPU, memory and IO limits, the capability set that replaced the old names, and what the views report.
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Chapter 21.2
Resource Queues: How the Legacy Manager Works
ACTIVE_STATEMENTS, MAX_COST, MEMORY_LIMIT and PRIORITY explained from the source — and an honest account of why resource groups are replacing them.