> ### Optionally configuring the FathomTrendDatabase

> After you install Fathom and before you begin the configuration in the Fathom Management console (as described in Chapter 5, "Setting Up Fathom for the First Time"), you can preallocate file system space in the FathomTrendDatabase. This preallocation step is optional; however, it will make the FathomTrendDatabase run more efficiently if you create fixed length extents before the FathomTrendDatabase is created.

> To preallocate file system space:

> 1. Copy the FathomTrendDatabase structure file (`fathom.st`) that exists in the <fathom-install-dir>`/db` to the directory where the database will reside. The default directory is <fathom-install-dir>`/db`.
> 2. Edit the file, and add fixed length data extents to area 7.
> 3. Continue with the configuration as described in Chapter 5, "Setting Up Fathom for the First Time." When the FathomTrendDatabase is created, the database will pick up and use the structure file that exists in the directory where the database is being created.

> For more information about editing `.st` files, see OpenEdge Data Management: Database Administration.

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