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High precision data determines how large numbers are represented with greater accuracy. The precision attributed to a number includes the scale of the number. For example, the value 11.47 has a precision of 4 and a scale of 2. Large numbers can lose accuracy because of rounding when used in a calculation that produces an overflow. Incorrect results may arise because of a failure to truncate the high precision data.
High precision data values have greater accuracy. Enable high precision if you require accurate values.
You enable high precision on the properties tab of the session. The Integration Service processes high precision data differently for bigint and decimal values.