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When used in the context of databases, memory refers to RAM directly addressable by the CPU as opposed to going through the I/O subsystem.

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Understanding why MongoDB uses more RAM than the allowed wiredTigerCacheSizeGB

If you run queries, sort things, make connections, etc, those all require memory outside of the cache. … MongoDB uses tcmalloc for memory management, which doesn't immediately release memory back to the OS when the program calls free. …
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