> For the complete documentation index, see [llms.txt](https://docs.payfacto.com/payfacto-knowledge/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.payfacto.com/payfacto-knowledge/maitred-pos/maitred/maitred-complete-online-documentation/chap-10-database/reconstruction/btree.md).

# Btree

The Btree reconstruction option fixes the Btree file if it becomes corrupted. Some information may be lost if the Btree is badly corrupted. Use this option as a trouble shooter if you are having system problems. Reconstructing the Btree file may solve the problem.

When you choose this option, the system reconstructs the Btree. A report showing any errors in the Btree file is generated and automatically displays on the screen. If the result displays any errors, contact a PayFacto software support specialist.