mysql_upgrade — Check and Upgrade MySQL Tables • --character-sets-dir= dir_name • --compress ,  -C • --compression-algorithms= value • --debug[= debug_options ] ,  -# [ debug_options ] • --debug-check • --debug-info ,  -T • --default-auth= plugin • --defaults-extra-file= file_name • --default-character-set= charset_name 409 For additional information about this and other option-file options, see Section 4.2.2.3, “Command-Line Options that Affect Option-File Handling” . Read this option file after the global option file but (on Unix) before the user option file. If the file does not exist or is otherwise inaccessible, an error occurs. If  file_name  is not an absolute path name, it is interpreted relative to the current directory. Use  charset_name  as the default character set. See Section 10.15, “Character Set Configuration” . A hint about which client-side authentication plugin to use. See Section 6.2.17, “Pluggable Authentication” . Print debugging information and memory and CPU usage statistics when the program exits. Print some debugging information when the program exits. Write a debugging log. A typical  debug_options  string is  d:t:o, file_name . The default is  d:t:O,/ tmp/mysql_upgrade.trace . This option was added in MySQL 8.0.18. For more information, see Section 4.2.8, “Connection Compression Control” . The permitted compression algorithms for connections to the server. The available algorithms are the same as for the  protocol_compression_algorithms  system variable. The default value is uncompressed . Compress all information sent between the client and the server if possible. See Section 4.2.8, “Connection Compression Control” . As of MySQL 8.0.18, this option is deprecated. Expect it to be removed in a future version of MySQL. See Configuring Legacy Connection Compression. The directory where character sets are installed. See Section 10.15, “Character Set Configuration” .