Looks like Oracle is feeling the pressure from the free DBs like Postgres and MySQL.

From the Oracle webpage: Oracle Database 10g Express Edition (Oracle Database XE) is an entry-level, small-footprint database based on the Oracle Database 10g Release 2 code base that’s free to develop, deploy, and distribute.

Link.

Looks like the maximum DB size is 4GB and it uses only one processor and at most one GB RAM.

Having a free Oracle DB is good for the projects where one is forced to use an Oracle DB.

 SELECT a, b, INTO OUTFILE '/tmp/result.text' FIELDS TERMINATED BY ','
 OPTIONALLY ENCLOSED BY '"' LINES TERMINATED BY '\n' FROM test_table;

 JR> Yes, those are the "certified" Linux releases, but Oracle versions prior to
 JR> 10g could be installed on other distros.  The screenshots seem to indicate
 JR> that the Installer now checks which Linux you're running, which leads me
 JR> back to the original question.

 I haven't tried it myself, but Wim Coekaerts once mentioned
 an "-ignoreSysPrereqs" installer option that would get you
 past that Linux distribution check.

Or suggested by DJ: edit the oraparam.ini file and edit the supported versions section.

Or: run

 runInstaller --help

and actually read it :-)