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Variables to adjust:
*** MySQL's maximum memory usage is dangerously high ***
*** Add RAM before increasing MySQL buffer variables ***
query_cache_size (=0)
query_cache_type (=0)
query_cache_limit (> 1M, or use smaller result sets)
tmp_table_size (> 16M)
max_heap_table_size (> 16M)
performance_schema = ON enable PFS
innodb_log_file_size should be (=32M) if possible, so InnoDB total log files size equals to 25% of buffer pool size.