SDO_GEOM.RELATE... speed up!

Question

With 8.1.7, I run the following querry to check if one geometry(GEOM1) is the same as the other geometry(GEOM2).
SELECT MDSYS.SDO_GEOM.RELATE(GEOM1, v_DIMINFO,'EQUAL',GEOM2,v_DIMINFO) INTO v_OUT FROM DUAL;
IF v_OUT='FALSE' THEN
BUT I FOUND it will take TWO OR THREE MINUTES to complete. Because both of these geometries are not indexed, I can not use operator like SDO_RELATE.
Another option is to run the following querry:
IF MDSYS.SDO_GEOM.SDO_XOR(GEOM1, v_DIMINFO, GEOM2, v_DIMINFO IS NOT NULL THEN;
But it took more than FOUR minutes.
Is there any other suggestion to speed it up???
Thanks in advance.
Jerry

Answer 1

Thanks for Dan's help.
I will check the tolerance and the complicity of the geometry.
Now the geometries are both linestrings.
It is what I worry about that the query may take quite long time for complicate geomerties.
Another interesting thing I just found.
Because GEOM2 is always a part or all of the GEOM1. That is, GEOM1 should never be inside GEOM2.
So, If I run the following query:
SELECT MDSYS.SDO_GEOM.RELATE(GEOM1, v_DIMINFO,'EQUAL+INSIDE', GEOM2, v_DIMINFO) INTO v_OUT FROM DUAL;
IF v_OUT='FALSE' THEN.......
The determinant part of the mask is 'equal' and it will do the same thing as the query:
SELECT MDSYS.SDO_GEOM.RELATE(GEOM1, v_DIMINFO,'EQUAL',GEOM2,v_DIMINFO) INTO v_OUT FROM DUAL;
BUT, I found it(equal+inside) faster(+50% improvement!) than just using 'equal' as mask.
Anyone can tell me the reason? Is this cheating safe if I assume GEOM1 is never inside GEOM2??
Thanks in advance!!!