The INT8 data type stores whole numbers that can range in value from –9,223,372,036,854,775,807 to 9,223,372,036,854,775,807 [or -(263-1) to 263-1], for 18 or 19 digits of precision.

The number –9,223,372,036,854,775,808 is a reserved value that cannot be used. The INT8 data type is typically used to store large counts, quantities, and so on.

IBM® Informix® stores INT8 data in internal format that can require up to 10 bytes of storage.

Arithmetic operations and sort comparisons are performed more efficiently on integer data than on floating-point or fixed-point decimal data, but INT8 cannot store data with absolute values beyond | 263-1 |. If a value exceeds the numeric range of INT8, the database server does not store the value.