Free database file system software for linux

All System Info is a system info SuperKaramba theme. Simple english version...
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- System Info
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Alternatives system is an implementation of a Debian alternatives system; a system that allows several programs with the same or similar functions to be installed on a single system at the same time.
This implementation solves some problems and limitations of original implementation.
Alternatives architecture
General engine:
- alternatives-auto - turn into auto mode some alternatives item
- alternatives-manual - turn into manual mode some alternatives item
- alternatives-update - update current state of alternatives symlinks
Special scripts for the packages:
- alternatives-install - register new alternatives config, for use in %post package script
- alternatives-uninstall - unregister some alternatives config, for use in %preun package script
ALT Linux specific:
- alternatives-helper - helper script to use in package scripts
- alternatives-upgrade - tool to upgrade from old config format (XML based) to new.
Directories:
- /usr/bin - all scripts live here
- /etc/alternatives/packages.d - all package configs
- /etc/alternatives/auto - symlinks to registered configs
- /etc/alternatives/manual - list of alternatives in manual mode
- /etc/alternatives/links - for internal use only, alternatives symlinks lives here
- /usr/share/alternatives - directory with some helper functions and scripts
Original Debian alternatives implementation has some limitations and problems, so we (ALT Linux Team) rewrite this subsystem. What changes we have made?
- You dont need to give special generic name for altenatives file. This name is autogenerated now.
- This version is written in shell, awk and sed , so we reduce a number of dependencies, therefore, number of the packages in basesystem.
- We use different update model. Original alternatives system maintains its own database, by creating/removing files in system. In our alternatives (rpm) packages contains its configs and places them into generic directory during package installation. After package removal its config is automatically removed. It works like Debian menu subsystem, and its more stable.
- Now we have not any limitations for master-slave hieracly depth.
- New alternatives system works with no groups, but with each item. You can turn into manual mode any available item. There are only one difference between master and slave: weight calculation algorithm. Slave alternative have same weight as a master alternative.
- alternatives-update script corrects invalid manual alternatives, by switching them into auto mode. In original alternatives was situations with broken symlinks. Also new system doesnt create symlinks if target file does not exist. As a result, we also reduce number of broken symlinks.

Zild Database Library implements a small and easy to use database API with an easy to use API.
Main features:
- ability to connect to multiple database systems
- zero runtime configuration
- ability to connect using a URL scheme
- thread-safe connection pooling.

GNUstep Database Library 2 (GDL2) is a set of libraries to map Objective-C objects to rows of relational database management systems (RDBMS).
GNUstep Database Library 2 aims to be compatible with Enterprise Objects Framework (EOF) as released with WebObjects 4.5 from Apple Inc.
Main features:
- EOControl (gnustep-db2control)
- The fundamental abstraction library which includes many non RDBMS related extensions such as KeyValueCoding extensions and other categories. Most importantly it contains the classes which handle the coordination of object graphs namely EOEditingContext.
- EOAccess (gnustep-db2)
- This library implements the underlying mechanism to retrieve and store data in RDBMS. It defines the abstract classes like EOAdaptor which are subclassed to interface with concrete RDBMS implementations.
- EOInterface
- This library implements classes used to synchronize UI components such as NSTextFields, NSButtons and NSTableViews with the state of objects which an EOEditingContext contains.
- EOAdaptors
- This is a collection of concrete EOAdaptor projects needed to connect to specific databases. GDL2 currently only supplies an Adaptor for the PostgreSQL database. Even though the Adaptor is still called Postgres95 we aim to support PostgreSQL 7.2 and higher API. In fact the Adaptor may very soon be renamed to PostgreSQL.
- DBModeler

Mckoi SQL Database is a full featured SQL-92 relational database management system written in Java.

The software can operate as either a dedicated multi-client, multi-threaded database server, or can be used as an embedded database inside a Java application.

The engine is designed to be easy to use and maintain and versatile for sophisticated database development tasks. The software provides a JDBC 2.0 driver.

To use Mckoi SQL Database, you will need a JavaTM runtime environment version 1.2 or greater. Sun provides Java runtimes for Win32, Solaris and Linux from their website at http://www.javasoft.com/j2se/. IBM also provides various Java runtimes for a number of platforms at http://www.ibm.com/java/jdk/download/.

When Java has been installed on your system, unpack the mckoi distribution file to a directory in your file system. Then you are ready to create a database and develop your database application.

Creating A Database

Before you can begin development of your database application, you will need to create and configure a blank database. The database configuration file describes all of the configurable properties of the database (details of the database configuration file are covered in the next section). The software ships with a default configuration that looks for a database at path ./data in your filesystem.

To create a database using the default configuration with an admin username of admin_user and password aupass00, go to a prompt, change to the Mckoi Database distribution directory and type:

java -jar mckoidb.jar -create "admin_user" "aupass00"

We do not advise using either this username or password in a production system. The user created here has full control over every aspect of the database so choose a username / password carefully.

When the command has completed, a sub-directory called data will have been generated. This directory is used to store data from the database. A sub-directory called log is also generated which stores debugging and query log information.

Database Configuration

When you run the mckoidb.jar package, it looks for a file named db.conf in the current directory. This file contains a number of variables that determine where the database looks for information, as well as other user-definable properties. The configuration file can be renamed and copied to a different location. If you change the configuration file location, you must supply the location when you run the database;

java -jar mckoidb.jar -conf [location of conf file] .....

You can edit the configuration file with a text editor. The default configuration file that ships with the software contains extensive comments on what each variable does.