In-Memory Database Guide : Calculating the maximum BLOB size
  
Calculating the maximum BLOB size
One important difference between in-memory tables and disk-based tables is that column values in in-memory tables must fit into a single “page” (the page size is specified in the solid.ini configuration file, and its maximum is 32 KB Therefore, in-memory tables cannot store character or binary files larger than the page size. Smaller binary files, however, are supported.
This appendix shows how to calculate the maximum size of a character or binary column value that will fit in your in-memory tables.
See also
Background
Calculating the space available for BLOB data