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    2.         [--start-time TIMESTAMP_IN_MICROSECONDS]
    3.         [--end-time TIMESTAMP_IN_MICROSECONDS] [--retention-days DAYS]
    4.         {show,clean}
    6. Slow Query Diagnosis: Analyse the root cause of slow query
    10. optional arguments:
    11.   -h, --help            show this help message and exit
    12.   -c DIRECTORY, --conf DIRECTORY
    13.                         set the directory of configuration files
    14.   --query SLOW_QUERY    set a slow query you want to retrieve
    16.                         be retrieved
    17.   --end-time TIMESTAMP_IN_MICROSECONDS
    18.                         set the end time of a slow SQL diagnosis result to be
    19.                         retrieved
    20.   --retention-days DAYS
    21.                         clear historical diagnosis results and set the maximum