Phase 4: Data Migration & Implementation

Phase 4 represents the completion and launch of the application. Data from the existing system is finally and fully migrated into the new system and, after verifying its accuracy, a complete switchover is made.

  • Obtain data sample of complete database for analysis
    • Create data transformation scripts to migrate data from old format to temporary structure
    • Create data migration scripts to migrate data from temporary structure to new system
    • Test migration of sample data, review for accuracy
  • Schedule transition date, off-peak hour preference
    • Lock old system from receiving additional data input or changes
    • Send complete data through transformation process
      • Review data in temporary structure for accuracy of transformation
    • Send data to new system through migration process
      • Review data in new system for accuracy of migration
    • Bring new system online, deactivate old system
  • Client interaction: review system for completeness of data migration

Read on to Phase 5: Support & Maintenance

 

HTMList.com: Synapse Studios' Blog

Is PHP 5.3 Terminal? Well, It's Getting One For Namespaces

A language lives and dies by how easy it is for a person to express something within that language. But the ease in expression is much like the type I and type II error rate in a statistical test: as you adjust one to be nearer to where you want it to be, the other gets farther away. So the architects of a language have to choose between adding more keywords and constructs or having longer, but simpler sequences of existing ones.

PHP is a very easy language to learn and use because it has a syntax that is a simplified sampling from C++/Java and Perl. People who use these languages pick up PHP fast, and people who haven't used any languages often learn PHP with as much ease as they would learn Perl.

Posted on October 27, 2008 by Edgar HasslerRead More »

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