More than one SDO_GEOMETRY columns in one Oracle 8i spatial table

Question

I have a spatial table as follows:
CREATE TABLE TEST(
ID VARCHAR2(255) NOT NULL,
POINT MDSYS.SDO_GEOMETRY,
LINE MDSYS.SDO_GEOMETRY,
POLYGON MDSYS.SDO_GEOMETRY,
PRIMARY KEY(ID));
Is it a good practice to have more than one SDO_GEOMETRY columns
in one spatial table? What are the drawbacks if any to have a
spatial with more than one layer?

Answer 1

I have one question about more than one SDO_GEOMETRY columns
in one table in Oracle 8.1.7. When I wanted to create two
spatial indices for this table, every time I got some error.
Can anyone tell me how to figure it out?
Thanks very much,
Fan Fan,
You need to insert metadata record before creating spatial
indices.
Try the following:
REM USER_SDO_GEOM_METADATA :
REM insert a row for the geom layer for TEST TEST2 tables
REM
INSERT INTO USER_SDO_GEOM_METADATA
( TABLE_NAME, COLUMN_NAME, DIMINFO, SRID)
VALUES ('TEST', 'POINT', MDSYS.SDO_DIM_ARRAY
(MDSYS.SDO_DIM_ELEMENT('LON', -180,
180, .000005),MDSYS.SDO_DIM_ELEMENT('LAT', -90, 90, .000005)),
NULL);
INSERT INTO USER_SDO_GEOM_METADATA
( TABLE_NAME, COLUMN_NAME, DIMINFO, SRID)
VALUES ('TEST', 'LINE', MDSYS.SDO_DIM_ARRAY
(MDSYS.SDO_DIM_ELEMENT('LON', -180,
180, .000005),MDSYS.SDO_DIM_ELEMENT('LAT', -90, 90, .000005)),
NULL);
INSERT INTO USER_SDO_GEOM_METADATA
( TABLE_NAME, COLUMN_NAME, DIMINFO, SRID)
VALUES ('TEST', 'POLYGON', MDSYS.SDO_DIM_ARRAY
(MDSYS.SDO_DIM_ELEMENT('LON', -180,
180, .000005),MDSYS.SDO_DIM_ELEMENT('LAT', -90, 90, .000005)),
NULL);
REM create a spatial index based on TRAFFIC.GEOM
REM
REM
CREATE INDEX TEST_G_POINT_IDX ON TEST(POINT) INDEXTYPE IS
MDSYS.SPATIAL_INDEX;
CREATE INDEX TEST_G_LINE_IDX ON TEST(LINE) INDEXTYPE IS
MDSYS.SPATIAL_INDEX;
CREATE INDEX TEST_G_POLYGON_IDX ON TEST(POLYGON) INDEXTYPE IS
MDSYS.SPATIAL_INDEX;