Embedded filesystems & databases

Filesystems

General criteria:

• robustness to power cut (journaling)
• different size of write/erase blocks
• efficiency (footprint, overhead…)

Examples:

• LittleFs looks excellent: https://github.com/littlefs-project/littlefs

• FatFs http://elm-chan.org/fsw/ff/00index_e.html

• eefs: https://github.com/nasa/eefs (RTEMS, vxWorks, stand-alone)

• spiffs: https://github.com/pellepl/spiffs (in middle of a rewrite as of 2023)

• larger: YAFFS

Databases

• List
• https://github.com/pmwkaa/sophia: Modern transactional key-value/row storage library.
• https://github.com/symisc/unqlite: An Embedded NoSQL, Transactional Database Engine
• https://github.com/vmxdev/tkvdb: Trie key-value database
• https://github.com/erthink/libmdbx: One of the fastest embeddable key-value ACID database without WAL. libmdbx surpasses the legendary LMDB in terms of reliability, features and performance.
• https://github.com/cruppstahl/upscaledb: A very fast lightweight embedded database engine with a built-in query language.