"Times of change are upon the database market. The major
established database companies are being challenged by open source
upstarts like MySQL and PostgreSQL. For years, Open Source
Databases (OSDBs) have been quietly increasing their penetration,
but until recently they have lacked the capabilities to seriously
threaten proprietary databases like Oracle, IBM's DB2, and
Microsoft's SQL Server.
"All that has changed. OSDBs now boast the necessary features
and robustness to support commercial databases hundreds of
Gigabytes in size..."