MySQL server memory usage troubleshooting tips: If you are using MyISAM then you need to check for�Key_buffer_size, while using InnoDB, you can check innodb_buffer_pool_size, �innodb_additional_memory_pool_size, innodb_log_buffer_size,��innodb_sort_buffer_size (used only for sorting data while creating index in innodb, introduced from 5.6). max_connections, query_cache_size and table_cache are also important variables to check.�
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