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DB2 - Problem description

Problem IC67422 Status: Closed

DB2DART FAILS TO IDENTIFY INITIALIZED BUT UNUSED EXTENT MAP PAGES THAT
ARE CORRUPT

product:
DB2 FOR LUW / DB2FORLUW / 950 - DB2
Problem description:
In a DMS tablespace, when a table is created, an entire extent 
of Extent Map Pages (EMP) are initialized. Initially, only the 
first page of this EMP extent is used. If an unused EMP page 
becomes corrupted (due to hardware failure), then db2dart is not 
able to idenitfy this corruption. 
If this corrupt page is ever accessed, either as a result of 
growing the table, reorganizing the table, or dropping the 
table, then the database will crash with a bad page error.
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* all users                                                    * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* In a DMS tablespace, when a table is created, an             * 
* entireextentof Extent Map Pages (EMP) are initialized.       * 
* Initially, onlythefirst page of this EMP extent is used. If  * 
* an unused EMP pagebecomes corrupted (due to hardware         * 
* failure), then db2dart isnotable to idenitfy this            * 
* corruption.If this corrupt page is ever accessed, either as  * 
* a result ofgrowing the table, reorganizing the table, or     * 
* dropping thetable, then the database will crash with a bad   * 
* page error.                                                  * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 9.50.FP6                                      * 
****************************************************************
Local Fix:
Use 'db2 inspect' command instead of db2dart
available fix packs:
DB2 Version 9.5 Fix Pack 6a for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 7 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 8 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 10 for Linux, UNIX, and Windows

Solution
Problem was first fixed in Version 9.5 Fix Pack 6
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
24.03.2010
25.05.2010
25.05.2010
Problem solved at the following versions (IBM BugInfos)
9.5.FP6,
9.50.FP6
Problem solved according to the fixlist(s) of the following version(s)
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