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User defined resource pool
I want to know resource pool memory allocation behaviour. Lets say I have three users A, Band C. I have created three user defined pools and allocated maxmemory 80% to each. Now what happens when users A and B are executing their task but C is idle. Does the memory allocated to C is reserved or it will be used by A and B if required. Is it a good approach to define separate pool for every users? If not, then how to overcome this? Suppose the query run by ETL sometimes fail with the error "Insufficient resource to execute on general pool". Next time they run, it gets executed. So I am bit surprised and confused.