I'm currently developping a text format called WSL[1]. By nature text files don't have indices, but it is strongly typed, supports standard relational integrity

I'm currently developping a text format called WSL[1]. By nature text files don't have indices, but it is strongly typed, supports standard relational integrity constraints, and indices can be automatically created when reading the file. There is a currently only a simplistic python library which reads databases at about 1MB/s. On the plus side it's dead simple to use, only a single library call to parse a file as schema, tables, and indices. There is also a C library in development which lexes at about 300-600 MB/s in a single thread (depending on how many columns are actually needed and thus have to be written to per-column lexem buffers) and which I hope will have a release next month. [1] http://jstimpfle.de/projects/wsl/main.html http://jstimpfle.de/projects/wsl/main.html