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IT17909: DB2 COMMANDS AND CONNECTION ATTEMPT HANG WHEN CF SCA STRUCTURE MEMORY IS FULL

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APAR status

  • Closed as program error.

Error description

  • DB2 commands and connection attempt can be hung when CF SCA
    structure memory is full.
    An agent calling SAL_WriteAndRegister went into sleep without
    finishing the call completely.
    This may impact to other agents to wait for latches that this
    agent holds.
    
    db2diag log pattern :
    
    EDUID   : XXXXX               EDUNAME: db2agent (DBNAME_CA0) 0
    FUNCTION: DB2 UDB, Shared Data Structure Abstraction Layer for
    CF,
    SAL_GBP_HANDLE::SAL_WriteAndRegister, probe:25126
    MESSAGE :
    ZRC=0x852700A1=-2061041503=SQLE_SAL_CACHE_STOCLASS_FULL
              "CF CA_CACHE_WAR_STOCLASS_FULL or
    CA_CACHE_WARM_STOCLASS_FULL error."
    DATA #1 : String, 43 bytes
    Giving up retries due to out of SCA memory.
    
    Relevant stack pattern :
    
    _p_nsleep
    nsleep
    nanosleep
    ossSleep
    sqlorest
    SAL_WriteAndRegister
    sqleSCAWrite
    sqlpWriteXaTranToSCA
    ....
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * ALL                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to DB2 11.1 Mod 2 Fix Pack 2 or higher               *
    ****************************************************************
    

Problem conclusion

  • First fixed in DB2 11.1 Mod 2 Fix Pack 2
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT17909

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    B10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-11-10

  • Closed date

    2017-06-23

  • Last modified date

    2017-06-23

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

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

Fix information

  • Fixed component name

    DB2 FOR LUW

  • Fixed component ID

    DB2FORLUW

Applicable component levels

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSEPGG","label":"Db2 for Linux, UNIX and Windows"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"11.1","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
29 June 2020