TWO MSSQL= ORACLE Migration Problems

Question

I have to migrate a MS SQL Database to ORACLE, but I'm facing two major problems.
1) How do I treat NOCLUSTERED Primary Keys and CLUSTERED Unique-IDs? There is no equivalent in Oracle, is there?
2) What can I do about MS SQL "Uniqueidentifiers"? Please give me some help, I allready read the MigrationGuide and looked in the internet, but I couldn't find any solutions to this...
So how would you translate this MS-SQL table?
CREATE TABLE example (
someid int IDENTITY(1,1),
type varchar(20) NOT NULL,
real uniqueidentifier NOT NULL,
PRIMARY KEY NONCLUSTERED (someid),
UNIQUE CLUSTERED (
real
UNIQUE (
type
Any help will be greatly appreciated!
Thanx in advance,
Mark

Answer 1

First thing when you create a primary key in sql server it is defaulted to clustered index, which is not the case with Oracle.
To retain the identity property of the someid field you would have create sequence for that column which is fired by trigger.
something like this
CREATE SEQUENCE "S_EXAMPLE_ID" INCREMENT BY -1
START WITH -1 MAXVALUE 1.0E27 MINVALUE 0 NOCYCLE
CACHE 30 NOORDER
CREATE OR REPLACE TRIGGER "TRG_EXAMPLE_SEQ"
BEFORE
INSERT ON "EXAMPLE" FOR EACH ROW begin
select S_EXAMPLE_ID.nextval into :new.SOMEID FROM dual;
END;
As for index you have decide which you want to use based on your requirements and clustered indexes in oracle is different from that in Sql Server