IBM Support

IC80024: DB2 may encounter 'deadlock' on system catalog SYSIBM.SYSCOLAUTH when performing two DROP TABLE statements simultaneously.

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APAR status

  • Closed as program error.

Error description

  • Deadlocks on system catalog may occur when concurrently perform
    two DROP TABLE statements on two different tables.
    
    To identify the problem, you need to use DB2 event monitor to
    collect detailed information for deadlocks.
    When the deadlock error occurs, in the event monitor output you
    will see the following entries:
    =============================================
      Table of lock waited on      : SYSPLANDEP
      Schema of lock waited on    : SYSIBM
      Type of lock: Row
      Mode of lock: X  - Exclusive
      Mode application requested on lock: S  - Share
        Text    : drop table NEWTON.T1
    
      Table of lock waited on      : SYSCOLAUTH
      Schema of lock waited on    : SYSIBM
      Type of lock: Row
      Mode of lock: U  - Update
      Mode application requested on lock: U   - Update
        Text    : drop table NEWTON.T2
    =============================================
    

Local fix

  • Perform the two DROP TABLE statements sequentially.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All users of version 9.5 on Linux, Unix and Windows          *
    * platforms.                                                   *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * Deadlocks on system catalog may occur when concurrently      *
    * perform two DROP TABLE statements on two different tables.   *
    *                                                              *
    * To identify the problem, you need to use DB2 event monitor   *
    * to collect detailed information for deadlocks.               *
    * When the deadlock error occurs, in the event monitor output  *
    * you will see the following entries:                          *
    * =============================================                *
    *   Table of lock waited on      : SYSPLANDEP                  *
    *   Schema of lock waited on    : SYSIBM                       *
    *   Type of lock: Row                                          *
    *   Mode of lock: X  - Exclusive                               *
    *   Mode application requested on lock: S  - Share             *
    *     Text    : drop table NEWTON.T1                           *
    *                                                              *
    *   Table of lock waited on      : SYSCOLAUTH                  *
    *   Schema of lock waited on    : SYSIBM                       *
    *   Type of lock: Row                                          *
    *   Mode of lock: U  - Update                                  *
    *   Mode application requested on lock: U   - Update           *
    *     Text    : drop table NEWTON.T2                           *
    * =============================================                *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to DB2 LUW Version 9.5 FixPak 9 or higher levels.    *
    ****************************************************************
    

Problem conclusion

  • First fixed in DB2 LUW Version 9.5 FixPak 9.
    

Temporary fix

  • Perform the two DROP TABLE statements sequentially.
    

Comments

APAR Information

  • APAR number

    IC80024

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    950

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-11-28

  • Closed date

    2012-03-12

  • Last modified date

    2012-03-12

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

    IC80424 IC84198

Fix information

  • Fixed component name

    DB2 FOR LUW

  • Fixed component ID

    DB2FORLUW

Applicable component levels

  • R950 PSN

       UP

[{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSEPGG","label":"DB2 for Linux, UNIX and Windows"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"9.5","Edition":"","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
12 March 2012