Erases the specified portion of the LOB value of this object starting at the specified offset.
The arguments for the method are:
Obtain either a row-level lock or object-level lock before calling this method. The actual number of characters or bytes and the requested number differ if the end of the LOB value is reached before erasing the requested number of characters or bytes. For
BLOB types, erasing means that zero-byte fillers overwrite the existing LOB value. For
CLOB types, erasing means that spaces overwrite the existing LOB value.