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month-end closing performance issue

Dear Experts,

     We have met the serious performance issue during month-end closing. It takes more than 48 hours to run CON2 and 30 hour to run CO88. However, there is no any performance issue at the daily system operation. Our basis engineer collects the system information as below:

     SAP component version: EHP4 FOR SAP ERP 6.0 / NW7.01

      Operation system: AIX

      Database: DB6

      DB version: 09.01.0009

     We have only one server for our production system. This server plays both roles as database server and application server.

     During month-end closing, the status of system as following:

     CPU     User%     Kern%     Wait%     Idle%

     ALL        9.7          0.7          10.9         78.6

     Network     KBPS     I-Pack     O-Pack     KB-In     KB-Out

     Total          1379.7     1954.1     1723.8     690.3     689.3

     Disk          Busy%     KBPS     TPS     KB-Read     KB-Write

     Total          100%       16.5K     1015.0     16.5K        12.0

     FileSystem     KBPS     TPS     KB-Read     KB-Write

     Total               16.5K     1.1K     16.5K          12.0

     SAP Memory     Curr.Use %     CurUse[KB]     MaxUse[KB]     In Mem[KB]

     Roll area          10.02               26,261               29,720               131,072

     Page area          1.75               28,028           1,599,992            1,120,000

     Extended mem   0.72          1,921,024           8,384,512         268,435,456

     Heap mem                                      0                       0             2,779,384

     Our basis engineer also collect top 5 tables as following. The total size of database is 686,260,352.

     Table name          Size

     COSS         123,019,562

     COEP           59,508,832

     RESB             6,593,504

     MSEG            4,800,640

     AFRU             3,621,568

     Can anybody tell me what we can do to improve our month-end closing performance? No matter which kind of solutions. Thanks in advance.

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