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Siebel Database Upgrade Guide > Preparing an IBM DB2 Database for a Siebel Upgrade > Identifying IBM DB2 Long Columns for Truncation in a Siebel UpgradeEnvironments: Development, production test, production. In Siebel CRM version 7.7, the maximum length for IBM DB2 long columns with a type of varchar was reduced to 16,350 from 16,383. Upgrading from version 7.5.3 truncates long varchar columns that exceed 16,350. To prevent a data truncation error that might cause transaction processing ( CAUTION: If you do not truncate the data in long varchar columns that exceed the maximum length specified in the following task, then a To identify and reduce the length of long varchar columns
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