http://www.tcl.tk/community/tcl2007/proceedings/databases/speedtables-paper-2.pdf

Speed tables provides an interface for defining tables containing zero or more
rows, with each row containing one or more fields. The speed table compiler
reads a table definition and generates C code to create and manage corresponding
structures, producing a set of C access routines and a C language extension
for Tcl to create, access and manipulate those tables. It then compiles the extension,
links it as a shared library, and makes it loadable on demand via Tcl's
"package require" mechanism.

Speed tables are well-suited for applications for which this table/row/field abstraction
is useful, with row counts from the dozens to the tens of millions, for
which the performance requirements for access, search and/or update frequency
exceed those of the available SQL database, and the application does not require
“no transaction loss” behavior in the event of a crash.

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Project link: http://sourceforge.net/projects/speedtables 
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