Specifying the frequency for flushing buffers

Log files are written to buffered data streams. If you are monitoring the log files in real time, alter the frequency with which the server flushes the log file buffers.

By default, log files are flushed every 20 seconds as shown in the following example:
[logging]
flush-time = 20

If you specify a negative value, a flush is forced after each record is written.