Technical Article

Finding a table name from a page ID

Imagine you come to work in the morning and notice that some new rows have been entered into the msdb.dbo.suspect_pages table during the night. Usually the first thing you’re going to do is run DBCC CHECKDB, but if your database is a few TB, that could be several hours before you know where the problem is, and which table may have lost data. You want to find out which table is involved as soon as possible so you can explore your disaster recovery options.

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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