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error: "Invalid blob length"

MICROSOFT SQL DRIVER
USING BLOBS GREATER THAN 32K IN SIZE
For tables without a unique index, blobs greater than 32k in 
size cannot be used. For tables with unique indexes this is 
allowed but, under certain circumstances, placing or retrieving 
blobs greater than 32k in size may result in a server error that 
indicates the server is trying to unlock a data page that is 
already unlocked. This is a problem on the server side and not 
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