Hewlett-Packard is suing former CEO Mark Hurd to stop him from taking a job at rival Oracle.

The complaint filed Tuesday in a California state court comes a day after Oracle Corp. hired Hurd as co-president to help lead the database software maker as it tries to muscle in on more of Hewlett-Packard Co.'s turf.

The lawsuit shows the growing rancor between the two companies, which are longtime partners that are now competing in the market for computer servers.

HP claims that Hurd wouldn't be able to perform the job at Oracle without spilling HP's trade secrets and violating a confidentiality agreement. Hurd signed such an agreement as part of a severance package from HP that could top $40 million.