Re: The location where mysql cluster save the data
The <table_name>.frm files are used by the MySQL Servers - they describe the schema for the tables but do not contain any of the table data.
In your config.ini file you should have defined a "datadir" parameter for your data nodes (ndbd/ndbmtd) - you'll find the files containing the data from the ndb tables there. Note that the sub-directories and file names will not be based on the table names as the data is not organised in that way - look for something like "ndb_4_fs".
Unless you've explicitly turned off checkpointing to disk, you can shut down your cluster and then restart it (*don't start the ndbd/ndbmtd processes with the --initial option*) without losing your data.
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