DB2 9 & 10 for z/OS Overview

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Migration Planning WorkshopFastest Available In DB2 10: Hash AccessQuery:Unique Key Value1 data page accessDataPages•Key finds the row without index•Reduced:•Page visits•CPU time•Elapsed timeRidPage in buffer poolPage is read fromdisk1 data page disk I/O(Possibly in buffer pool)-Trade-off: extra space used122© 2011 IBM Corporation
Migration Planning WorkshopCreate Objects with Hash Organization1PBG2PBR3TABLESPACE options:-Table space MUST beUTS PBG or PBR-Can be created explicitly-or DB2 creates itimplicitly – 64MB forHASH space1. SYSTABLESPACESTATS.TOTALROWS:Actual number of rows in the table2. SYSTABLESPACESTATS.DATASIZE:Total number of bytes used for rowsOverflow INDEX-DB2 creates it implicitlyNew variation of index object createdto store hash column information.The index will only contain entries to rowsin the overflow area.43. SYSINDEXSPACESTATS.TOTALENTRIES:Number of overflow records with keys in the overflow index123© 2011 IBM Corporation
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DB2 9 & 10 for z/OS Overview

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