Availability Group (AG)

Technical Article

Monitoring Availability Group Replica Synchronization

  • Article

If you are deploying SQL Server Availability Groups, one of the important aspects of a successful deployment is monitoring the synchronization of the secondary replica databases with the primary replica - but there are multiple ways to do this. Jonathan Kehayias goes through each, explaining their different benefits and drawbacks.

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2015-09-17

2,771 reads

Technical Article

Are my actual worker threads exceeding the sp_configure 'max worker threads' value?

  • Article

Tom Stringer (@SQLife) was working on some HADR testing for a customer to simulate many availability groups and introduce significant load into the system to measure overhead and such. In his quest to do that he was seeing behavior that he couldn’t really explain and so worked with him to uncover what was happening under the covers.

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2013-07-23

3,177 reads

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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