A string specifying the reserve size. The default is a null reference (Nothing in Visual Basic).
The values for the reserve size parameter is specified in units of bytes. Use the suffix k or K to indicate units of kilobytes
and the suffix m or M to indicate megabytes.
The reserve_size parameter allows you to pre-allocate the file system space required for your UltraLite database without inserting
any data. Reserving file system space can improve performance slightly and also prevent out of memory failures. By default,
the persistent storage file only grows when required as the application updates the database.
Note that reserve_size reserves file system space, which includes the metadata in the persistent store file, and not just
the raw data. The metadata overhead and data compression must be considered when deriving the required file system space from
the amount of database data.
The reserve_size parameter reserves space by growing the persistent store file to the given reserve size on startup, regardless
of whether the file previously existed. The file is never truncated.
The following parameter string ensures that the persistent store file is at least 2 MB upon startup.