Useful MySQL commands

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  • show open TABLES WHERE in_use <> 0 - shows tables in used, eventually locked
  • show processlist - shows all processes including the ones locking tables
  • show full processlist - same as above, but with complete statements
  • kill <pid> - kills a process. Useful for unlocking tables locked by lost processes
  • OPTIMIZE TABLE  tbl_name [, tbl_name] ... - Reorganizes the physical storage of table data and associated index data, to reduce storage space and improve I/O efficiency when accessing the table.


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