Fixes are available
DB2 Version 9.1 Fix Pack 7 for Linux, UNIX and Windows
DB2 Version 9.1 Fix Pack 5 for Linux, UNIX and Windows
DB2 Version 9.1 Fix Pack 6 for Linux, UNIX and Windows
DB2 Version 9.1 Fix Pack 6a for Linux, UNIX and Windows
DB2 Version 9.1 Fix Pack 7a for Linux, UNIX and Windows
DB2 Version 9.1 Fix Pack 8 for Linux, UNIX and Windows
DB2 Version 9.1 Fix Pack 9 for Linux, UNIX and Windows
DB2 Version 9.1 Fix Pack 10 for Linux, UNIX and Windows
DB2 Version 9.1 Fix Pack 11 for Linux, UNIX and Windows
DB2 Version 9.1 Fix Pack 12 for Linux, UNIX and Windows
APAR status
Closed as program error.
Error description
When a large object (BLOB, CLOB, or DBCLOB data type) object that is associated with a table crosses the 2 terabyte (TB) size boundary, there is a problem in the space allocation algorithm that can lead to corruption of the table space. For example a previously allocated extent might be erroneously reused. One occurrence of this problem resulted in the beginning pages of the LOB table space being overwritten when the LOB object grew larger than 2 terabytes.
Local fix
Use a range partitioned table to split LOBs for a column into separate LOB objects to avoid crossing the 2TB threshold for a single LOB object. The size of the LOB object can be determined using the following command: db2pd -db dbname -tcbstats One of the columns that is generated in this report is LobSize (which is shown as number of pages). A quick calculation (number of pages * page size) will give the size of the LOB object. If the LOB object has already crossed the 2TB boundary just applying the fix will not correct the issue, the table will still need to be rebuilt.
Problem summary
User affected: Any using large > 2TB LOB objects in a table for LOB storage. Problem description: Corruption of the LOB object can occur if it crosses the 2TB size boundary. Problem Summary: see above
Problem conclusion
Problem was first fixed in Version 9.1 FixPak 5 (s080512).
Temporary fix
Use a range partitioned table to split LOBs for a column into separate LOB objects to avoid crossing the 2TB threshold for a single LOB object. Note: If the LOB object has already crossed the 2TB boundary just applying the fix will not correct the issue, the table will still need to be rebuilt.
Comments
APAR Information
APAR number
LI73319
Reported component name
DB2 UDB WSE LIN
Reported component ID
5765F3504
Reported release
910
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt
Submitted date
2008-03-28
Closed date
2008-07-12
Last modified date
2008-09-04
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 UDB WSE LIN
Fixed component ID
5765F3504
Applicable component levels
R910 PSN
UP
Document Information
Modified date:
15 October 2021