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SQL Server's Auto Update Statistics Async Option

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I have been trying to tune my SQL Server and I noticed a few database settings for statistics. I also read the previous tip on automatic statistics updates. Could you please describe the Auto Create Statistics Async option? How is this configured and when should I use it and when should I avoid using it?

2013-03-26

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Question of the Day

ORDER BY alias

There is a table tmp_tab: 

CREATE TABLE tmp_tab (
id int,
val int
);
INSERT INTO tmp_tab VALUES
(1, 1),
(2, NULL),
(3, 3),
(4, 4),
(5, 5);
You want to order the rows ids by the following expression: 
    ISNULL(val, id) + 1
Which of the following queries produces the expected ordering and why? (Select all correct)

See possible answers