IC87401: NO DATA PAGE READAHEAD OCCURS WHEN AUTO_READAHEAD IS 0 (OFF) AND RA_PAGES IS PRESENT AND SET

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APAR status

  • Closed as documentation error.

Error description

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * Users of version 11.70xC6 and earlier 11.70 versions         *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * No data page readahead occurs when AUTO_READAHEAD is 0 (off) *
    * and RA_PAGES is present and set.                             *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * If the AUTO_READAHEAD configuration parameter is present in  *
    * your onconfig file, the database server ignores values that  *
    * are set in the RA_PAGES configuration parameter.             *
    *                                                              *
    * If the AUTO_READAHEAD configuration parameter is not present *
    * in the onconfig file, RA_PAGES is used if it is present in   *
    * the onconfig file.                                           *
    ****************************************************************
    

Problem conclusion

  • You can use the RA_PAGES configuration parameter to specify the
    number of disk pages to attempt to read ahead during sequential
    scans of data records. However, if the AUTO_READAHEAD
    configuration parameter is present in your onconfig file, the
    database server ignores values that are set in the RA_PAGES
    configuration parameter.   (AUTO_READAHEAD, when present in the
    onconfig file, takes precedence over other read-ahead
    parameters.)
    
    If the AUTO_READAHEAD configuration parameter is not present in
    the onconfig file, RA_PAGES is used if it is present in the
    onconfig file.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IC87401

  • Reported component name

    INFORMIX SERVER

  • Reported component ID

    5725A3900

  • Reported release

    B70

  • Status

    CLOSED DOC

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-10-22

  • Closed date

    2014-02-26

  • Last modified date

    2014-02-26

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

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

Fix information

Applicable component levels



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Document information


More support for:

Informix Servers

Software version:

B70

Reference #:

IC87401

Modified date:

2014-02-26

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