Practical Data Migration

DATA SIZING

Data size Data size is the amount of data to be loaded.

When designing the data migration event, the question of how big it is becomes significant. It is the biggest single determinant of the run times (see below).

Data size is normally expressed in bytes, kilobytes, gigabytes and terabytes as we go up the order of size. However, we can also measure data in terms of the number of records to be read and written. The number to be read is often far more than the number actually written, but reading takes time too. Complex data navigation can involve reading a score of records before a single record is written to the new system.

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