DB2 9 & 10 for z/OS Overview

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Migration Planning WorkshopHistory table for SYSTEM TIMEORTo enable SYSTEM TIME you then alter the table:Note:If you need to make changes to the table, you will need to alter the table to dropthe versioning, make the changes, and then alter the table to add versioning.74© 2011 IBM Corporation
Migration Planning WorkshopRow Maintenance with System Time• No temporal syntax for System Time maintenance– Use regular Update, Delete, Insert statements• If the modification impacts existing base table rows–Insert or Update –The base table row(s) are created / updated with a currentSystem Start Time and high value System End Time.–Delete–Update or Delete–Remove the base table row.–Create a “before-image” copy of all qualified base tablerows in the History Table.–If a previous copy of a row exists in the History table•Limit the System timeframe of the previous copy–Set previous copy’s End System Time = copiedrow’s Begin System Time–The newly created History row(s) are added with aSystem End Time equal to the current time (System StartTime of the associated base table row for an update)75© 2011 IBM Corporation
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DB2 9 & 10 for z/OS Overview

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