DB2 9 & 10 for z/OS Overview

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Migration Planning WorkshopConverged TEMP Space (continued)• IFCID 002 & 343 updated to report usage and exceptions– Make sure to review PK70060 & PK92163• Soft separation of sort workfile and DGTT requests (DB2 Managed Only)• Work files marked unavailable after extents– PM02528• ZParm WFDBSEP for hard separation of workfile and DGTT usage– II14587 – DB2 9 workfile recommendations• Access is virtualized for small amounts of data, eliminating costof work file creation (reduced CPU and I/O)– At runtime, a result fitting in 1 data page does not create a workfile– ORDER BY and FETCH FIRST n ROWS without index support• Uses memory replacement technique if result fits within a 32k page• Sort is avoided204© 2011 IBM Corporation
Migration Planning WorkshopSpanned Workfiles– Spanned workfile records solves problems when sorting > 32Krecords– Records for joins & large sorts can now span pages– Max record length for workfiles is increased to 65,529 bytes– Max length of sort key is increased from 16,000 to 32,704 bytes– Alleviate -670 when length of join is larger than max page size inworkfile db– NFM OnlyWORKFILE TABLESPACE 1PAGE 1 (32k) PAGE 2 (32k)Sort row1Sort row1205© 2011 IBM Corporation
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