Manipulation of index in Oracle

Create table for testing
DROP TABLE "ATWLAM"."TABLE1";
CREATE TABLE "ATWLAM"."TABLE1" AS SELECT * FROM USER_OBJECTS;

Create Index
CREATE INDEX "ATWLAM"."I_TEST1" ON "ATWLAM"."TABLE1" ("OBJECT_ID") TABLESPACE "ATWLAM_INDEX";

Rebuild Index
ALTER INDEX "ATWLAM"."I_TEST1" REBUILD ONLINE;