IBM Cognos User Manual page 210

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Log Files
The following settings control where and how Cognos Transformer writes
information to an ASCII-text log file.
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IBM Cognos Transformer Version 10.1.1: User Guide
The temporary file can be used to recover a suspended model at strategic
checkpoints if severe errors occur during cube creation. This file has the
extension .qy?, where the ? is replaced by the character used in your version of
Cognos Transformer.
<Preference Name="DataWorkDirectory" Value="path1;path2;..."/>
This setting specifies where Cognos Transformer creates temporary work files
when generating cubes. The default path is the "temp" directory in the
installation_location/c10 directory. Cognos Transformer creates multiple files
automatically, and concatenates them into one logical file, regardless of which
drive they are in.
By distributing the files across multiple drives, you can work around size
limitations imposed by your operating system, and reduce disk contention. The
location of the files is determined by the list of paths that you specify. The files
are created in the order specified in the list of paths.
<Preference Name="DataSourceDirectory" Value="path1;path2;..."/>
This setting specifies where Cognos Transformer searches for data source files
other than .iqd files. The default is the installation_location/c10/data directory.
<Preference Name="CubeSaveDirectory" Value="path1;path2;..."/>
This setting specifies where Cognos Transformer saves cubes. On Windows, the
default is the \Transformer\PowerCubes subdirectory under your home
directory. On UNIX and Linux, the default is the temp subdirectory in the
installation_location/c10 directory.
<Preference Name="ModelSaveDirectory" Value="path"/>
This setting specifies where Cognos Transformer saves models. On Windows, the
default is the \Transformer\Models subdirectory under your home directory. On
UNIX and Linux, the default is the temp subdirectory in the
installation_location/c10 directory.
MultiFileCubeThreshold
This setting specifies a value that determines one of the following options:
– the creation of a single cube that is larger than 2 GB
– the threshold at which multiple files are created for a very large cube; for
example, 30,000,000 if your cube is still less than 2 GB or 1,000,000 to create
smaller cubes.
The multifile cube contains one file with the .mdc extension, and one or more
files with the multidimensional partition (.mdp) extension. This type of cube
cannot be compressed.
The default value is 0, which means that multifile cube generation is disabled.
<Preference Name="LogFileDirectory" Value="path"/>
This setting specifies where Cognos Transformer creates the log file. On
Windows, the default is the \Transformer\logs subdirectory under your home
directory. On UNIX and Linux, the default is the temp subdirectory in the
installation_location/c10 directory. If the logs subdirectory does not exist, then the
default is the current working directory.
<Preference Name="LogFileName" Value="file_name"/>