INFORMIX CORP
SC 13D/A, 1998-10-30
PREPACKAGED SOFTWARE
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<PAGE>



                                 UNITED STATES
                     SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

                                 SCHEDULE 13D
                                 Amendment #1
                 Under the Securities Exchange Act of 1934


                          RED BRICK SYSTEMS, INC.
- -------------------------------------------------------------------------------
                              (Name of Issuer)

                                COMMON STOCK
- -------------------------------------------------------------------------------
                       (Title of Class of Securities)

                                 756422101
                              (CUSIP Number)


     GARY LLOYD, VICE PRESIDENT, LEGAL, GENERAL COUNSEL AND SECRETARY
                             4100 BOHANNON DRIVE
                       MENLO PARK, CALIFORNIA  94025
                                (650) 926-6300
(Name, Address and Telephone Number of Person Authorized to Receive Notices and 
Communications)

                                October 7, 1998
            (Date of Event which Requires Filing of this Statement)


If the filing person has previously filed a statement on Schedule 13G to report 
the acquisition which is the subject of this Schedule 13D, and is filing this 
schedule because of Rule 13d-1(e), (f) or (g), check the following box.

NOTE:  Schedules filed in paper format shall include a signed original and five 
copies of the Schedule, including all exhibits.  See Rule 13d-1(a) for other 
parties to whom copies are to be sent.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the 
Notes).

<PAGE>

                                 SCHEDULE 13D/A

CUSIP No. 756442                                               Page 2 of 8 Pages
- -------------------------------------------------------------------------------
1  NAME OF REPORTING PERSON
   S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

   Informix Corporation
- -------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                 (a) / /
                                                                     (b) / /
   N/A
- -------------------------------------------------------------------------------
3  SEC USE ONLY

- -------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
   00
- -------------------------------------------------------------------------------

5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
   ITEMS                                                      2(d)or 2(e) / /

   N/A
- -------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION

   STATE OF DELAWARE
- -------------------------------------------------------------------------------
                 7  SOLE VOTING POWER
                    N/A
                 --------------------------------------------------------------
NUMBER OF        8  SHARED VOTING POWER
SHARES              1,433,278
BENEFICIALLY     --------------------------------------------------------------
OWNED BY         9  SOLE DISPOSITIVE POWER
EACH                N/A
REPORTING        --------------------------------------------------------------
PERSON           10 SHARED DISPOSITIVE POWER
WITH                N/A
- -------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
    1,433,278
- -------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*  / /

- -------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
    11.06%
- -------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*
    CO
- -------------------------------------------------------------------------------

                   *SEE INSTRUCTIONS BEFORE FILLING OUT!
           INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7





<PAGE>

                          SCHEDULE 13D/A



Neither the filing of this Schedule 13D nor any of its contents shall be deemed 
to constitute an admission by Informix Corporation that it is the beneficial 
owner of any of the Common Stock referred to herein for purposes of Section 
13(d) of the Securities Exchange Act of 1934, as amended (the "Act"), or for 
any other purpose, and such beneficial ownership is expressly disclaimed.

ITEM 1.     SECURITY AND ISSUER.

            This statement on Schedule 13D relates to the Common Stock of Red 
            Brick Systems, Inc., a Delaware corporation ("RBS" or "Issuer").  
            The principal executive offices of  RBS are located at 485 
            Alberto Way, Los Gatos, California 95032.

ITEM 2.     IDENTITY AND BACKGROUND.

            The name of the corporation filing this statement is Informix 
            Corporation, a Delaware corporation ("Informix").  Informix's 
            principal business is as a provider of information management 
            software products.  The address of the principal executive 
            offices of Informix is 4100 Bohannon Drive, Menlo Park, 
            California 94025.  Set forth in SCHEDULE A is a list of each of 
            Informix's directors and executive officers as of the date 
            hereof, along with the present principal occupation or employment 
            of such directors and executive officers, their respective 
            citizenship and the name, principal business and address of any 
            corporation or other organization other than Informix in which 
            such employment is conducted. 

            During the past five years neither Informix nor, to Informix's 
            knowledge, any person named in SCHEDULE A to this statement, has 
            been convicted in a criminal proceeding (excluding traffic 
            violations or similar misdemeanors).  Also during the past five 
            years neither Informix nor, to Informix's knowledge, any person 
            named in SCHEDULE A to this statement, was a party to a civil 
            proceeding of a judicial or administrative body of competent 
            jurisdiction as a result of which such person was or is subject 
            to a judgment, decree or final order enjoining future violations 
            of, or prohibiting or mandating activity subject to, federal or 
            state securities laws or finding any violation with respect to 
            such laws.  Consequently, neither Informix nor, to Informix's 
            best knowledge, any person named on SCHEDULE A hereto is required 
            to disclose legal proceedings pursuant to Item 2(d) or 2(e) of 
            Schedule 13D.

ITEM 3.     SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

            Pursuant to an Agreement and Plan of Reorganization, dated as of 
            October 7, 1998, (the "Merger Agreement"), among Informix, IC 
            Merger Corporation, a Delaware corporation and a wholly-owned 
            subsidiary of Informix ("Merger Sub"), and RBS, and subject to the 
            conditions set forth therein (including approval by the 
            stockholders of RBS), Merger Sub will merge with and into RBS and 
            RBS will become a wholly-owned subsidiary of Informix (such 
            events constituting the "Merger").  Upon consummation of the 
            Merger, Merger Sub will cease to exist as a corporation and all 
            of the business, assets, liabilities and obligations of Merger 
            Sub will be merged into RBS with RBS remaining as the surviving 
            corporation 

<PAGE>

                                       SCHEDULE 13D/A



            (the "Surviving Corporation").  As a result of the Merger, 
            each outstanding share of RBS Common Stock, other than 
            shares owned by RBS, will be converted into the right to 
            receive 0.600 of a share (the "Exchange Ratio") of Informix 
            Common Stock, and each outstanding option to purchase RBS 
            Common Stock will be assumed by Informix (each, an "Assumed 
            Option"), along with any outstanding warrants to purchase 
            RBS Common Stock (each, an "Assumed Warrant") and will 
            become an option or warrant to purchase that number of 
            shares of Informix Common Stock as is equal (rounded down to 
            the nearest whole share) to the number of shares of RBS 
            Common Stock that was subject to such option or warrant 
            immediately prior to the Merger, multiplied by the Exchange 
            Ratio.  The exercise price of each Assumed Option and 
            Assumed Warrant will be equal to the quotient determined by 
            dividing the exercise price per share of RBS Common Stock at 
            which such Assumed Option or Assumed Warrant was exercisable 
            immediately prior to the effective time of the Merger by the 
            Exchange Ratio, rounded up to the nearest whole cent.  The 
            foregoing summary of the Merger is qualified in its entirety 
            by reference to the copy of the Merger Agreement included as 
            EXHIBIT 99.1 to this Schedule 13D and incorporated herein by 
            reference.

            This statement on Schedule 13D also relates to certain Voting 
            Agreements described in Item 4 below and the Stock Option Agreement
            described in Item 6 below.

ITEM 4.     PURPOSE OF TRANSACTION.

            (a) - (b)  As described in Item 3 above, this statement 
            relates to the Merger of Merger Sub, a wholly-owned 
            subsidiary of Informix, with and into RBS in a statutory 
            merger pursuant to the provisions of the Delaware General 
            Corporation Law.  At the effective time of the Merger, the 
            separate existence of Merger Sub will cease and the 
            existence of RBS will continue as the Surviving Corporation 
            and as a wholly-owned subsidiary of Informix.  Holders of 
            outstanding RBS Common Stock will receive, in exchange for 
            each share of Issuer Common Stock held by them, 0.600 shares 
            of Informix Common Stock (the "Exchange Ratio").  Using the 
            same Exchange Ratio, Informix will also assume (i) all 
            outstanding options to purchase RBS Common Stock and (ii) any 
            outstanding warrants to purchase RBS Common Stock upon 
            consummation of the Merger. 

            As an inducement to Informix to enter into the Merger Agreement, 
            each stockholder of RBS who is a party to a Voting Agreement, 
            dated as of October 7, 1998 (each a "Voting Agreement," and 
            collectively, the "Voting Agreements"), among the parties thereto 
            (each a "Voting Agreement Stockholder," and collectively, the 
            "Voting Agreement Stockholders") with Informix, has, by executing 
            a Voting Agreement, irrevocably appointed directors on the Board 
            of Directors of Informix as his, her or its lawful attorney and 
            proxy.  Such proxies give Informix the limited right to vote the 
            shares of RBS Common Stock beneficially owned by the Voting 
            Agreement Stockholders (including any shares of RBS Common Stock 
            that such stockholders acquire after the time they entered into 
            the Voting Agreements) (collectively, the "Shares").  

<PAGE>

                                      SCHEDULE 13D/A



            The names of the Voting Agreement Stockholders, the number 
            of shares of RBS Common Stock beneficially owned by each 
            such stockholder and the percentage ownership of RBS Common 
            Stock by each such stockholder is set forth in SCHEDULE B 
            hereto which is hereby incorporated by this reference. 

            In exercising its right to vote the Shares as lawful 
            attorney and proxy of the Voting Agreement Stockholders, the 
            Board of Directors of Informix will be limited, at every RBS 
            stockholders meeting and every written consent in lieu of 
            such meeting, to vote the Shares (i) in favor of approval of 
            the Merger and the Merger Agreement and (ii) against 
            approval of any proposal made in opposition to or in 
            competition with the consummation of the Merger and against 
            any merger, consolidation, sale of assets, reorganization or 
            recapitalization with any party other than Informix and any 
            liquidation or winding up of RBS.  Each of the Voting 
            Agreement Stockholders may vote his or her Shares on all 
            other matters.  The Voting Agreements terminate upon the 
            earlier to occur of (i) such date and time as the Merger 
            shall become effective in accordance with the terms and 
            provisions of the Merger Agreement or (ii) such date as the 
            Merger Agreement shall be terminated in accordance with its 
            terms (the "Expiration Date").  Each Voting Agreement 
            Stockholder has agreed not to transfer his or her Shares 
            prior to the Expiration Date.  The foregoing summary of the 
            terms of the Voting Agreement is qualified in its entirety 
            by reference to the form of Voting Agreement included as 
            EXHIBIT 99.2 to this Schedule 13D and incorporated herein by 
            reference.

            (c)     Not applicable.

            (d)     It is anticipated that, upon consummation of the Merger, the
            directors and the initial officers of the Surviving Corporation 
            shall generally be the current directors and officers of Merger 
            Sub (each of whom is an executive officer of Informix), until 
            their respective successors are duly elected or appointed and 
            qualified. 

            (e)     See discussion of Merger in Item 3 above.

            (f)     Other than as a result of the Merger described in Item 3 
            above, not applicable.

            (g)     Upon consummation of the Merger, the Certificate of 
            Incorporation of Merger Sub, as in effect immediately prior to 
            the Merger, shall be the Certificate of Incorporation of the 
            Surviving Corporation until thereafter amended as provided by 
            Delaware Law and such Certificate of Incorporation.  Upon 
            consummation of the Merger, the Bylaws of Merger Sub, as in 
            effect immediately prior to the Merger, shall be the Bylaws of 
            the Surviving Corporation until thereafter amended.

            (h)     Upon consummation of the Merger, RBS Common Stock will 
            be de-listed from The Nasdaq Stock Market.

<PAGE>

                                    SCHEDULE 13D/A



            (i)     Upon consummation of the Merger, RBS Common Stock will be 
            de-registered under the Securities Act pursuant to Section 
            12(g)(4) of the Securities Act by filing a Form 15 with the 
            Securities and Exchange Commission.

            (j)     Other than described above, Informix currently has no 
            plan or proposals which relate to, or may result in, any of the 
            matters listed in Items 4(a) - (i) of Schedule 13D (although 
            Informix reserves the right to develop such plans).

ITEM 5.     INTEREST IN SECURITIES OF THE ISSUER.

            (a) - (b)  As a result and subject to the terms of the Voting 
            Agreements and the irrevocable proxies granted pursuant thereto, 
            Informix has the sole power to vote an aggregate of 1,433,278 
            shares of RBS Common Stock (including an aggregate of 403,991 
            shares subject to options purchasable by the Voting Agreement 
            Stockholders within 60 days of September 30, 1998) for the 
            limited purposes described in Item 4 above.  Such shares 
            constitute approximately 11.06% of the issued and outstanding 
            shares of Issuer Common Stock as of September 30, 1998 (after 
            giving effect to the exercise of all options exercisable within 
            60 days of such date).  Other than with respect to the provisions 
            of the Voting Agreements, Informix does not have the right to 
            vote the Shares on any other matters.  Informix does not share 
            voting power of any additional shares of RBS Common Stock with 
            regard to the limited purposes set forth in Item 4 above or 
            otherwise.  Informix does not have the sole power to vote or to 
            direct the vote or to dispose or direct the disposition of any 
            shares of RBS Common Stock.  To Informix's knowledge, no shares 
            of Issuer Common Stock are beneficially owned by any of the 
            persons named in SCHEDULE A.  

            (c)     Informix has not effected any transaction in Issuer 
            Common Stock during the past 60 days and, to Informix's 
            knowledge, none of the persons named in SCHEDULE A has effected 
            any transaction in Issuer Common Stock during the past 60 days.

            (d)     Not applicable.

            (e)     Not applicable.

ITEM 6.     CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH 
            RESPECT TO SECURITIES OF THE ISSUER.

            Under the terms of a Stock Option Agreement, dated October 7, 
            1998, between Informix and RBS (the "Stock Option Agreement"), 
            RBS granted Informix an option (the "Merger Option") to acquire a 
            number of shares of RBS Common Stock, at the price of $2.40 per 
            share, equal to 19.9% of shares of RBS capital stock issued and 
            outstanding on the date the Merger Option is exercisable.  The 
            Merger Option is exercisable (i) immediately prior to the earlier 
            of a consummation of or the record date for a meeting of RBS 
            stockholders with regard to an acquisition proposal for an 
            acquisition transaction with a party other than 

<PAGE>

                                    SCHEDULE 13D/A



            Informix, (ii) immediately prior to the effectiveness of a change 
            of control of the RBS Board of Directors as a result of an 
            election contest within the meaning of Rule14a-11 of the 
            Securities Exchange Act, or (iii) upon the termination of the 
            Merger Agreement in accordance with its terms.  At any time the 
            Merger Option is exercisable, Informix may deliver a "put" notice 
            (the "Put Notice") to RBS,  requiring RBS to pay Informix the 
            difference between the market price and the exercise price of the 
            Merger Option.  Under the terms of the Stock Option Agreement, 
            any proceeds to Informix in excess of $2,000,000, resulting from 
            the exercise of the Merger Option, will be remitted to RBS, and 
            RBS will not be required to pay Informix more than $2,000,000 in 
            connection with the delivery of a Put Notice.  The foregoing 
            summary of the Stock Option Agreement is qualified in its 
            entirety by reference to the form of Stock Option Agreement 
            included as EXHIBIT 99.3 to this Schedule 13D and incorporated 
            herein by reference. 

            Other than the Merger Agreement, the Voting Agreements and the 
            Stock Option Agreement, to the best knowledge of Informix, there 
            are no contracts, arrangements, understandings or relationships 
            (legal or otherwise) among the persons named in Item 2 and 
            between such persons and any person with respect to any 
            securities of RBS, including but not limited to transfer or 
            voting of any of the securities, finder's fees, joint ventures, 
            loan or option arrangement, puts or calls, guarantees of profits, 
            division of profits or loss, or the giving or withholding of  
            proxies.

ITEM 7.     MATERIALS TO BE FILED AS EXHIBITS.

            The following documents are included as exhibits:

            1.  Agreement and Plan of Reorganization, dated October 7, 1998, 
                by and among Informix Corporation, a Delaware corporation, IC 
                Merger Corporation, a Delaware corporation and a wholly-owned 
                subsidiary of Informix Corporation, and Red Brick Systems, 
                Inc., a Delaware corporation.

            2.  Form of Voting Agreement, dated October 7, 1998, between 
                Informix Corporation, a Delaware corporation, and certain 
                stockholders of Red Brick Systems, Inc., a Delaware 
                corporation.

            3.  Form of Stock Option Agreement, dated October 7, 1998, 
                between Informix Corporation, a Delaware corporation, and Red 
                Brick Systems, Inc., a Delaware corporation.

<PAGE>

                                        SCHEDULE 13D/A



                                         SIGNATURE

         After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and 
correct.


Dated:  October 30, 1998

                                       INFORMIX CORPORATION


                                       By:  /s/ Gary Lloyd
                                          ------------------------------------
                                                Gary Lloyd
                                                Vice President, Legal, General
                                                Counsel and Secretary



<PAGE>

                              SCHEDULE 13D/A

                               SCHEDULE A
                               ----------
                  DIRECTORS AND EXECUTIVE OFFICERS OF
                          INFORMIX CORPORATION

<TABLE>
<CAPTION>
                                  PRESENT PRINCIPAL OCCUPATION
    NAME AND TITLE(1)                  AND NAME OF EMPLOYER            CITIZENSHIP
- ------------------------       -----------------------------------  ----------------
<S>                            <C>                                  <C>
Robert J. Finocchio, Jr.             Informix Corporation             U.S.
Chairman, President, 
and Chief Executive Officer

Jean-Yves Dexmier                   Informix Corporation              U.S.
Executive Vice President 
and Chief Financial Officer

Karen Blasing                       Informix Corporation              U.S.
Vice President, Business 
Development Finance

Susan T. Daniel                     Informix Corporation              U.S.
Vice President, Human Resources

James F. Engle                      Informix Corporation              U.S.
Vice President and Treasurer

Diane L. Fraiman                    Informix Corporation              U.S.
Vice President, 
Corporate Marketing

J.F. Hendrickson, Jr.               Informix Corporation              U.S.
Vice President, Customer 
Services

Stephen E. Hill                     Informix Corporation              U.S.
Vice President and General 
Manager, Tools Business Unit

Donald W. Hunt                      Informix Corporation              U.S.
Vice President, North American
Field Operations

Gary Lloyd                          Informix Corporation              U.S.
Vice President, Legal, 
General Counsel and Secretary

Leonard Palomino                    Informix Corporation              U.S.
Vice President and General
Manager, Data Warehousing

Wesley Raffel                       Informix Corporation              U.S.
Vice President and General
Manager, Web and E-Commerce

Stephanie P. Schwartz               Informix Corporation              U.S.
Vice President and 
Corporate Controller

Michael A. Stonebraker              Informix Corporation              U.S.
Vice President and Chief 
Technology Officer

F. Steven Weick                     Informix Corporation              U.S.
Vice President, Research
& Development
</TABLE>

- --------------------
        (1) The address for each executive officer or director is c/o Informix 
Corporation, 4100 Bohannon Drive, Menlo Park, California 94025.

<PAGE>

                                  SCHEDULE 13D/A

                            SCHEDULE A (Continued)

<TABLE>

<S>                            <C>                                    <C>
Leslie G. Denend                  President (Retired)                 U.S.
Director                       Network Associates, Inc.


Albert F. Knorp, Jr.               General Partner                    U.S.
Director and Assistant          Seaport Ventures, L.P.
Secretary


James L. Koch                        Professor                        U.S.
Director                       Santa Clara University


Thomas A. McDonnell                President, Chief                   U.S.
Director                          Executive Officer
                                    and Director
                                  DST Systems, Inc.


George Reyes                       Vice President and                 U.S.
Director                           Corporate Controller
                                  Sun Microsystems, Inc.


Cyril J. Yansouni               Chief Executive Officer and           U.S.
Director                             Chairman of the 
                                    Board of Directors
                                   Read-Rite Corporation
</TABLE>


<PAGE>

                                    SCHEDULE 13D/A

                                     SCHEDULE B
                                     ----------
                              RED BRICK SYSTEMS, INC.
                           VOTING AGREEMENT STOCKHOLDERS

<TABLE>
<CAPTION>
                                 SHARES OF RBS BENEFICIALLY       PERCENTAGE OF RBS
                                       OWNED BY VOTING       COMMON STOCK BENEFICIALLY
VOTING AGREEMENT STOCKHOLDER        AGREEMENT STOCKHOLDER             OWNED (1)
- -------------------------------  --------------------------  ---------------------------
<S>                              <C>                         <C>
Christopher G. Erickson                  861,522(2)                     6.81%
PRESIDENT, CHIEF EXECUTIVE 
OFFICER AND CHAIRMAN OF 
THE BOARD OF DIRECTORS

Andrew K. Ludwick                         16,000(3)                     0.13%
DIRECTOR

John F. Shoch                            239,874(4)                     1.91%
DIRECTOR

Phillip Fernandez                        195,958(5)                     1.54%
EXECUTIVE VICE PRESIDENT AND
CHIEF OPERATING OFFICER

Ron Barale                                35,380(6)                     0.28%
VICE PRESIDENT, PLATFORM
PRODUCTS GROUP

Peggy DeLeon                              38,464(7)                     0.31%
VICE PRESIDENT OF HUMAN RESOURCES

Andrew W. Priest                          14,798(8)                     0.12%
VICE PRESIDENT, SOLUTION AND 
SERVICES

Paul Rodwick                              31,282(9)                     0.25%
VICE PRESIDENT, MARKETING
</TABLE>

- ---------------------------
(1) Applicable percentage ownership is based on 12,558,738 shares of 
    Common Stock outstanding as of September 30, 1998.   Beneficial 
    ownership is determined in accordance with the rules of the Commission 
    and generally includes voting or investment power with respect to 
    securities, subject to community property laws, where applicable.  
    Shares of Common Stock subject to options that are presently 
    exercisable or exercisable within 60 days of April  30, 1998 are 
    deemed to be beneficially owned by the person holding such options for 
    the purpose of computing the percentage of ownership of such person 
    but are not treated as outstanding for the purpose of computing the 
    percentage of any other person.

(2) Includes 92,152 shares of RBS Common Stock issuable upon exercise of 
    outstanding options which are presently exercisable or will become 
    exercisable within 60 days of September 30, 1998. 


(3) Includes 16,000 shares of RBS Common Stock issuable upon exercise of 
    outstanding options which are presently exercisable or will become 
    exercisable within 60 days of September  30, 1998. 


(4) Includes 17,918 shares owned by Asset Management Associates 1989, L.P. 
    ("Asset"). Dr. Shoch, a director of Red Brick, is a general partner of 
    AMC Partners 89 L.P. ("AMC Partners"), which is the general partner of 
    Asset. Dr. Shoch disclaims beneficial ownership of the shares held by 
    Asset except to the extent of his pecuniary interest therein arising from 
    his interests in Asset and AMC Partners. Dr. Shoch's shares include 2000 
    shares held by his spouse and options exercisable into 16,000 shares of 
    Common Stock.


(5) Includes 171,197 shares of RBS Common Stock issuable upon exercise of 
    outstanding options which are presently exercisable or will become 
    exercisable within 60 days of September  30, 1998. 


(6) Includes 33,480 shares of RBS Common Stock issuable upon exercise of 
    outstanding options which are presently exercisable or will become 
    exercisable within 60 days of September  30, 1998. 

(7) Includes 38,464 shares of RBS Common Stock issuable upon exercise of 
    outstanding options which are presently exercisable or will become 
    exercisable within 60 days of September  30, 1998. 

(8) Includes 10,948  shares of RBS Common Stock issuable upon exercise of 
    outstanding options which are presently exercisable or will become 
    exercisable within 60 days of September  30, 1998. 

(9) Includes 25,750  shares of RBS Common Stock issuable upon exercise of 
    outstanding options which are presently exercisable or will become 
    exercisable within 60 days of September  30, 1998. 

<PAGE>

                                EXHIBIT INDEX

<TABLE>
<CAPTION>

Exhibit No.                    Description
- -----------                    -----------
<S>           <C>
99.1*         AGREEMENT AND PLAN OF REORGANIZATION, dated as of October 7, 
              1998, by and among Informix Corporation, a Delaware corporation 
              ("Parent"), IC Merger Corporation, a Delaware corporation and a 
              wholly-owned subsidiary of Parent ("Merger Sub"), and Red Brick 
              Systems, Inc., a Delaware corporation ("Company").

99.2*         Form of Voting Agreement, dated as of October 7, 1998, a 
              substantially similar version of which has been executed by and
              between Informix Corporation, a Delaware corporation 
              ("Parent"), and the undersigned stockholder ("Stockholder") of 
              Red Brick Systems, Inc., a Delaware corporation (the "Company").

99.3*         Form of STOCK OPTION AGREEMENT, dated as of October 7, 1998, a
              substantially similar version of which has been entered into by 
              and between Red Brick Systems, Inc., a Delaware corporation 
              ("RED BRICK") and Informix Corporation, a Delaware corporation 
              ("INFORMIX").
</TABLE>
- --------------------
*   Previously filed.



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