SECURITIES AND EXCHANGE COMMISSION

                                WASHINGTON, D.C. 20549


                                       FORM 8-K



                                    CURRENT REPORT



                          PURSUANT TO SECTION 13 OR 15(d) OF
                         THE SECURITIES EXCHANGE ACT OF 1934


                   Date of Report (Date of earliest event reported)
                         January 8, 1999 (December 31, 1998)


                                 INFORMIX CORPORATION
            --------------------------------------------------------------
                (Exact name of registrant as specified in its charter)



                                       DELAWARE
            --------------------------------------------------------------
                    (State or other jurisdiction of incorporation)

              0-15325                                    94-3011736
- -----------------------------------          -----------------------------------
      (Commission File Number)                (IRS Employer Identification No.)
 

                  4100 Bohannon Drive, Menlo Park, California 94025
            --------------------------------------------------------------
            (Address of principal executive offices)           (Zip Code)

          Registrant's telephone number, including area code (650) 926-6300
                                                             --------------



Item 2. ACQUISITION OR DISPOSITION OF ASSETS.

        On October 7, 1998, Informix Corporation, a Delaware corporation (the
"Registrant"), entered into a definitive agreement (the "Merger Agreement")
providing for the merger (the "Merger") of IC Merger Corporation, a Delaware
corporation and wholly-owned subsidiary of the Registrant ("Sub"), with and into
Red Brick Systems, Inc., a Delaware corporation ("Red Brick").  The Merger was
effected on December 31, 1998 (the "Effective Time"), pursuant to a Certificate
of Merger (the "Certificate of Merger") filed by Red Brick with the Secretary of
State of the State of Delaware.  Pursuant to the Certificate of Merger, upon the
Effective Time of the Merger, each outstanding share of Common Stock, $0.0001
par value, of Red Brick ("Red Brick Common Stock"), other than shares held in
the treasury of Red Brick or owned by Sub, the Registrant or any wholly-owned
subsidiary of Red Brick or the Registrant, were converted into the right to
receive 0.6 of a share of the Common Stock, $0.01 par value, of the Registrant
("Registrant Common Stock"), and each outstanding option or right to purchase
Red Brick Common Stock under the Red Brick 1995 Stock Option Plan, the
Supplemental Stock Option Plan, and the Written Compensation Agreements with
Phillip Fernandez and Christopher Erickson were assumed by the Registrant and
became an option or right to purchase Registrant Common Stock, with appropriate
adjustments to be made to the number of shares issuable thereunder and the
exercise price thereof based on the Exchange Ratio.

        The Merger is intended to be a tax-free reorganization under Section
368(a) of the Internal Revenue Code of 1986, as amended, and is intended to be
treated as a purchase for financial reporting purposes in accordance with
generally accepted accounting principles.  The assets of Red Brick were used,
prior to the Effective Time of the Merger, for the design, development,
marketing and support of data warehousing software, a use which the Registrant
intends to continue immediately following the Merger.

Item 7. FINANCIAL STATEMENTS AND EXHIBITS.

        The following financial statements and exhibits are filed as part of
this report, where indicated.

        (a)    Financial statements of business acquired, prepared pursuant to
               Rule 3.05 of Regulation S-X:

               Incorporated by reference to the Registrant's Amendment No.2 to
               the Registration Statement on Form S-4 (File No. 333-67671) filed
               with the Securities and Exchange Commission on December 8, 1998.

        (b)    No pro forma financial information is required pursuant to
               Article 11 of Regulation S-X.


        (c)    Exhibits in accordance with Item 601 of Regulation S-K:


                                         -2-





        Exhibits.
        --------
                
            2.1    Agreement and Plan of Reorganization, dated as of October
                   7, 1998, by and among Informix Corporation, a Delaware
                   corporation, Red Brick Systems, Inc., a Delaware
                   corporation, and IC Merger Corporation, a Delaware
                   corportion.

                   Incorporated by reference to the Registrant's Amendment
                   No. 2 to the Registration Statement on Form S-4 (File No.
                   333-67671) filed with the Securities and Exchange
                   Commission on December 8, 1998.

            2.2    Certificate of Merger by and between IC Merger
                   Corporation, a Delaware corporation, and Red Brick
                   Systems, Inc., a Delaware corporation, dated as of
                   December 31, 1998.



                                         -3-


                                      SIGNATURES

        Pursuant to the requirements of the Securities Exchange Act of 1934,
the Company has duly caused this Current Report to be signed on its behalf by
the undersigned, thereunto duly authorized in the City of Menlo Park, State of
California, on January 8, 1999.





                                        INFORMIX CORPORATION


                                        By:  /s/  Howard A. Bain III
                                           -------------------------------------
                                             Howard A. Bain III
                                             Executive Vice President and
                                             Chief Financial Officer


                                         -4-