If a DATA DIRECTORY or INDEX DIRECTORY table option is used in a CREATE TABLE statement on the master server, the table option is also used on the slave. This can cause problems if no corresponding directory exists in the slave host file system or if it exists but is not accessible to the slave server. As of MySQL 4.0.15, there is an sql_mode option called NO_DIR_IN_CREATE. If the slave server is run with this SQL mode enabled, it ignores the DATA DIRECTORY and INDEX DIRECTORY table options when replicating CREATE TABLE statements. The result is that MyISAM data and index files are created in the table's database directory.