Incorrect key file for table '/tmp/
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Disk space can be low.
Try to tune your mysql with mysqltuner: http://rackerhacker.com/mysqltuner/
Example mysql.cnf configuration:
max_allowed_packet = 256M key_buffer_size=256M key_buffer=258M innodb_buffer_pool_size = 100M query_cache_type=1 query_cache_limit=64M query_cache_size=64M join_buffer_size = 2M tmp_table_size = 512M max_heap_table_size = 512M thread_cache_size = 4 table_cache = 128 log-slow-queries = /var/lib/mysql/slow_query.log log-error=/var/lib/mysql/mysqld.log
/tmp can be full. This can happen with huge sql queries. Try limit them.
This error usually occurs when you got a corrupt table. The best way to solve this is to perform repair. This article might help:
