Oracle Corp won unconditional European Union approval on Thursday from the European Commission for its $7 billion takeover of Sun Microsystems, a month post offering public pledges to tranquilize regulatory concerns.

Though the approval in the European Union was a vital step forward for a deal enthusiastically acclaimed by some as transformational for the entire software industry, however, the deal is yet to receive its approval in other jurisdictions, including Russia and China.

The European Commission had initiated a deep investigation of the deal in September, revealing concerns about the competition impact on MySQL.

"I am now satisfied that competition and innovation will be preserved on all the markets concerned. Oracle's acquisition of Sun has the potential to revitalize important assets and create new and innovative products", EU Competition Commissioner Neelie Kroes said in a statement.

The nod for the deal was grabbed by Oracle last month when it made 10 public pledges to MySQL users, developers and customers to support the open source database for the next five years.

Oracle had in August last year fetched the green light from the U. S. Department of Justice for its takeover of Sun, developer of Java software, among the world's most widely used computer languages.