When trying from creating an index I have the following error.

*** IBPP::SQLException ***
Context: Transaction::Commit

SQL Message : -607
This operation is not defined for system tables.

Engine Code : 335544351
Engine Message :
unsuccessful metadata update
key size exceeds implementation restriction for index "PK_AFTUSUARIO"


Which is the maximun length of the fields for an index?

Thanks
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¦¦ ISMAEL ¦¦
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