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• shared_memory 

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(Windows only.) Whether the server permits shared-memory connections. 

• shared_memory_base_name 

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(Windows only.) The name of shared memory to use for shared-memory connections. This is useful when running multiple MySQL instances on a single physical machine. The default name is MYSQL . The name is case-sensitive. 

This variable applies only if the server is started with the shared_memory  system variable enabled to support shared-memory connections. 

• show_create_table_skip_secondary_engine 

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