sys_guid() not always unique?

Hello

I'm al little bit intrigued by what follows:

> create table test_table (id number (10), guid varchar2 (32));

table TEST_TABLE created.

> insert into test_table (id, guid) values (1, null);

1 inserted rows.

> insert into test_table (id, guid) values (2, null);

1 inserted rows.

> insert into test_table (id, guid) values (3, null);

1 inserted rows.

> update guid = sys_guid (set) test_table;

3 lines to date.

> select * from test_table;

GUID OF THE ID

---------- --------------------------------

1 0006694068E012E1E05383153C0A9B5C

2 0006694068E112E1E05383153C0A9B5C

3 0006694068E212E1E05383153C0A9B5C

> drop table test_table;

table TEST_TABLE deleted.

So why do I get the same GUID of each line? Oracle is lazy by just calling sys_guid() just once and use it for all the lines?

I want unique guid. What is the best solution?

I'm using Oracle XE 11 g on a Windows machine.

You have different GUIDS in each line. Look closely...

1 0006694068E012E1E05383153C0A9B5C

0006694068E1121E05383153C0A9B5C 2

3 0006694068E212th1E05383153C0A9B5C

Tags: Database

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