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["Mike Griffin" <mg@xxxxxxxxxx>]

https://mariadb.com/kb/en/mariadb/documentation/optimization-and-tuning/system-variables/server-system-variables/#table_definition_cache

Default Value: 400
Range: 400 to 64524288

In the code:

VALID_RANGE(TABLE_DEF_CACHE_MIN, 512*1024),



For MySQL:

http://dev.mysql.com/doc/refman/5.6/en/server-system-variables.html#sysvar_table_definition_cache

Default	400
Min Value	400
Max Value	524288