Formula for calculating MySQL’s peak memory

-- Formula for calculating MySQL’s peak memory, when all connections are full:
select

(@@key_buffer_size + @@query_cache_size + @@tmp_table_size
    + @@innodb_buffer_pool_size + @@innodb_additional_mem_pool_size
    + @@innodb_log_buffer_size
    + @@max_connections * (
        @@read_buffer_size + @@read_rnd_buffer_size
        + @@sort_buffer_size+ @@join_buffer_size
        + @@binlog_cache_size + @@thread_stack
    )
)/1024/1024/1024;

-- Memory single connection value calculation 1

select @@read_buffer_size , @@read_rnd_buffer_size
        , @@sort_buffer_size, @@join_buffer_size
        , @@binlog_cache_size, @@thread_stack;

-- Memory single Connection value calculation 2

select @@key_buffer_size , @@query_cache_size , @@tmp_table_size
    , @@innodb_buffer_pool_size , @@innodb_additional_mem_pool_size
    , @@innodb_log_buffer_size;

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