You can use the $UNIQUE_DSLOG environment variable to isolate the log output of a given server instance and prevent the sharing of log files resources. When the $UNIQUE_DSLOG variable is set, the designated DataServer log file name becomes a root name. Specifically, it becomes the prefix of a log file name that is followed by the process ID pid of the running server process - which is then suffixed with the familiar .lg extension if the server name is dataserv. This feature can be disabled by unsetting the UNIQUELOG environment variable.
With a unique name, the server executable can manage its own log file copy. However, the DSLOG-MANAGER system handle continues to disallow changes to the log file name or closing of the file at runtime. This restriction ensures that the DataServer always has an open log file to which it can write information. The legacy qt_debug logging mechanism relies on this being the case.
