X-Git-Url: http://www2.svjatoslav.eu/gitweb/?a=blobdiff_plain;f=doc%2Findex.org;h=a6372c44e97fa0152299dc0a812220fe5fe94431;hb=ea83ab5b7bfde99f3762333a8f8986f96d18454a;hp=caa29aa68ff459f2cf4c98dfb5808582001817b0;hpb=b382105757c3d9a2bb528fa8e4218354feff2429;p=sixth-data.git

diff --git a/doc/index.org b/doc/index.org
index caa29aa..a6372c4 100644
--- a/doc/index.org
+++ b/doc/index.org
@@ -1,31 +1,27 @@
-#+TITLE: Sixth - system for data storage, computation, exploration and interaction
+#+TITLE: Sixth Data - Data storage and computing engine
 
------
-- This is a subproject of [[http://www2.svjatoslav.eu/gitbrowse/sixth/doc/index.html][Sixth]]
+* General
+- This is a subproject of [[http://www3.svjatoslav.eu/projects/sixth/][Sixth]]
 
-- [[http://www2.svjatoslav.eu/gitweb/?p=sixth-data.git;a=snapshot;h=HEAD;sf=tgz][download latest snapshot]]
-
-- This program is free software; you can redistribute it and/or modify
-  it under the terms of version 3 of the [[https://www.gnu.org/licenses/lgpl.html][GNU Lesser General Public
-  License]] or later as published by the Free Software Foundation.
+- This program is free software: you can redistribute it and/or modify
+  it under the terms of the [[https://www.gnu.org/licenses/lgpl.html][GNU Lesser General Public License]] as
+  published by the Free Software Foundation, either version 3 of the
+  License, or (at your option) any later version.
 
 - Program author:
   - Svjatoslav Agejenko
   - Homepage: http://svjatoslav.eu
   - Email: mailto://svjatoslav@svjatoslav.eu
 
-- [[http://www.svjatoslav.eu/programs.jsp][other applications hosted at svjatoslav.eu]]
+- [[http://www.svjatoslav.eu/projects/][Other software projects hosted at svjatoslav.eu]]
 
+** Source code
+- [[http://www2.svjatoslav.eu/gitweb/?p=sixth-data.git;a=snapshot;h=HEAD;sf=tgz][Download latest snapshot in TAR GZ format]]
 
-* (document settings)                                              :noexport:
-** use dark style for TWBS-HTML exporter
-#+HTML_HEAD: <link href="https://bootswatch.com/darkly/bootstrap.min.css" rel="stylesheet">
-#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
-#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.1/js/bootstrap.min.js"></script>"
-#+HTML_HEAD: <style type="text/css">
-#+HTML_HEAD:   footer {background-color: #111 !important;}
-#+HTML_HEAD:   pre {background-color: #111; color: #ccc;}
-#+HTML_HEAD: </style>
+- [[http://www2.svjatoslav.eu/gitweb/?p=sixth-data.git;a=summary][Browse Git repository online]]
+
+- Clone Git repository using command:
+  : git clone http://www2.svjatoslav.eu/git/sixth-data.git
 
 * Vision / goal
   :PROPERTIES:
@@ -36,15 +32,19 @@ data storage engine for the [[http://www2.svjatoslav.eu/gitbrowse/sixth/doc/inde
 
 + Speaking of traditional relational database and object oriented
   business applications:
+
   + I hate object-relational impedance mismatch.
 
   + I don't like to convert data between persistent database and
-  runtime objects for every transaction. How about creating united
-  database/computation engine instead to:
-  + Eliminate constant moving and converting of data between 2 systems.
+    runtime objects for every transaction. How about creating united
+    database/computation engine instead to:
+
+  + Eliminate constant moving and converting of data between 2 systems
+    and make computing happen close to where the data is stored.
+
   + Abstract away difference between RAM VS persistent storage. Let
-  the system decide at runtime which data to keep in what kind of
-  memory.
+    the system decide at runtime which data to keep in what kind of
+    memory.
 
 * Inspiration
 + Relational databases:
@@ -70,7 +70,6 @@ data storage engine for the [[http://www2.svjatoslav.eu/gitbrowse/sixth/doc/inde
   + [[id:5d287158-53ea-44a2-a754-dd862366066a][Distributed comutation and data storage]]
   + [[id:a117c11e-97c1-4822-88b2-9fc10f96caec][Mapping of hyperspace to traditional object-oriented model]]
   + [[id:b6b15bd2-c78b-4c51-a343-72843a515c29][Handling of relations]]
-
 * Ideas
 ** Distributed computation and data storage
    :PROPERTIES:
@@ -130,7 +129,25 @@ Alternatively:
     + Point location along particular (book) dimension corresponds to
       amount of work contributed for book by given author (point).
 
+** Layered architecture
++ layer 1 :: disk / block storage / partition
+
++ layer 2 :: key/value storage. Keys are unique and are dictated by
+             storage engine. Value is arbitrary but limited size byte
+             array. This layer is responsible for handling disk
+             defragmentation and consistency in case of crash
+             recovery.
+
++ layer 3 :: key/value storage. Keys are content hashes. Values are
+             arbitrary but limited size content byte arrays. This
+             layer effectively implements content addressable
+             storage. Content addressible storage enables GIT-like
+             behavior (possibility for competing branches, retaining
+             history, transparent deduplication)
+
++ layer 4 :: Implements arbitrary dimensional multiverse.
 
++ layer 5 :: Distributed computation engine.
 * Current status
 - More or less defined [[id:f6764282-a6f6-44e6-8716-b428074dd093][Vision / goal]].
 
@@ -156,3 +173,13 @@ Interesting or competing projects with good ideas:
 
 + ZetaVM
   + https://github.com/zetavm/zetavm
+
+* (document settings)                                              :noexport:
+** use dark style for TWBS-HTML exporter
+#+HTML_HEAD: <link href="https://bootswatch.com/4/darkly/bootstrap.min.css" rel="stylesheet">
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.1/js/bootstrap.min.js"></script>"
+#+HTML_HEAD: <style type="text/css">
+#+HTML_HEAD:   footer {background-color: #111 !important;}
+#+HTML_HEAD:   pre {background-color: #111; color: #ccc;}
+#+HTML_HEAD: </style>