I am using Windows 2000 Professional and Oracle 8 with Developer 6i. I was comfortable, but after two months I recieved an error while connecting, ORA-01034: "Oracle is not available." I have 20GB of space free, with 256MB of RAM. How I can solve this problem?
You typically receive the ORA-1034 for one reason: your Oracle database is not up and running. This question is one that has been asked and answered numerous times on SearchOracle. Rather than reposting the same answer, I'd like to refer you to the many answers that already exist.
The following URL will direct you to the many questions and answers on this very topic: