There may be problems replicating from a master server that understands fractional seconds to an older slave that does not:
CREATE TABLEstatements containing columns that have an
fsp(fractional seconds precision) value greater than 0, replication will fail due to parser errors.
Statements that use temporal data types with an
fspvalue of 0 will work for with statement-based logging but not row-based logging. In the latter case, the data types have binary formats and type codes on the master that differ from those on the slave.
Some expression results will differ on master and slave. Examples: On the master, the
timestampsystem variable returns a value that includes a microseconds fractional part; on the slave, it returns an integer. On the master, functions that return a result that includes the current time (such as
UTC_TIMESTAMP()) interpret an argument as an
fspvalue and the return value includes a fractional seconds part of that many digits. On the slave, these functions permit an argument but ignore it.