To Create a Feature of Type Polygon

Create the table with one geometry column and one ID.

CREATE TABLE POLYGON
(ID NUMBER PRIMARY KEY, 
Geometry MDSYS.SDO_GEOMETRY);

Insert the table metadata into the Oracle Spatial metadata.

INSERT INTO USER_SDO_GEOM_METADATA (TABLE_NAME, COLUMN_NAME, DIMINFO, SRID) 
VALUES ('POLYGON', 'Geometry', 
MSYS.SDO_DIM_ARRAY
(MDYS.SDO_DIM_ELEMENT('X', 714099.913898663, 715312.343907550, 0.000000050),  
MDSYSS.DO_DIM_ELEMENT('Y', 4908438.586694972, 4910715.465519385, 0.000000050)), 
82247;

Create the spatial index of type multipolygon to use model multi-geometry objects.

CREATE INDEX POLYGON_IDX ON POLYGON(Geometry) 
INDEXTYPE IS MDSYS.SPATIAL_INDEX_V2 PARAMETERS ('layer_gtype=multipolygon');