ORA-51912
Syntax error in CREATE VECTOR INDEX. Specified quantization rescore factor without specifying the QUANTIZATION clause.
Cause
The CREATE VECTOR INDEX statement specified quantization rescore factor in the PARAMETERS clause without specifying the QUANTIZATION clause.
Action
Specify "QUANTIZATION [SCALAR] COMPRESSION [2/4/8]" to create a quantized index, or remove the quantization field from PARAMETERS.