package bank

Bancos, a simple KV-store

bancos is a KV-store, meaning that it can associate a string with a number (which can refer to a value). This KV-store is persistent (meaning that it is saved in a file or block device) and the structure can be manipulated by several programs in parallel:

• the structure used is ROWEX
• persistence comes from P-ART

bancos is therefore the first step in a database system capable of inserting (in parallel) new values or searching (also in parallel) for existing values according to a key.

The implementation of bancos does not depend on any particular scheduler, but we recommend using bancos with miou to enable parallelization of readers and writers.

Tools

A simple example:

$ git clone https://github.com/robur-coop/bancos.git
$ cd bancos
$ opam pin add -yn .
$ opam install --deps-only -t bancos
$ dune exec bin/sdb.exe -- -i rowex.idx -c test/005.cmds
db: 24139 action(s) committed

And 24139 entries were added into the index file rowex.idx. You can check values of them with:

$ dune exec bin/sdb.exe -- -i rowex.idx -c test/006.cmds
"desirous@pandering.us" => 8252    
"consoling@hubbubs.com.au" => 1697
"compulsory@tattooing.info" => 6262
"colloquialisms@exclude.com" => 5158
"penetrates@inefficiencies.com" => 15859
"dedicated@crocks.net" => 9554
"snoops@thud.net" => 16333
"stable@race.org" => 13586
...