New Post: Memory exhausted writing file

I have a simple program that generates a file with 11 columns and more than 1100 rows (so more than 121,000 cells). A simple formatting (bottom border) and that's it. But I have a memory exhausted on my host. On my workstation I can raise memory limit but not at my host.

How can I solve my problem? Can I write the file "on-the-fly"? Can I write the file while adding rows?