immediate value vs bind variable

Hi

I don't know where to start looking in the doc to find the answer / solution to this:

a WHERE TABLE_COLUMN > bind_variable
takes significantly longer than a
WHERE TABLE_COLUMN > 'immediate value'

The TABLE_COLUMN is a CHAR(2)

Whether I declare the bind variable as a char or varchar don't make a difference, it's always longer when using the bind variable. Exapmle: 0.23 seconds (immediate value) compared to 7.67 seconds (bind variable).

Suggestions please!

Thanks

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