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This ambiguous naming convention is not helpful to me; similar to the way the same column can have a different name from one system table to the next. This is not the most efficient aspect of my own personal work. It has become a pattern of trial and error for me. The AutoComplete list has accelerated my learning curve when working against SQL Server 2008. I could look at the catalog views to determine the type, but this is a hard habit to get into when writing code and stumbling upon new views and functions in SQL Server 2008. In a few isolated cases, information that we used to see in system tables has not been carried over to the new DMV structure. I will mention one of these cases briefly when I talk about sys.dm_exec_sessions further on. Thankfully, there is a decent workaround, but I am surprised at this well-publicized omission. It was reported early in the SQL Server 2005 development cycle, and has not been corrected in SQL Server 2008. I don t want to write an entire chapter about the background and underlying concepts behind DMVs. I urge you to peruse the Books Online documentation to learn more about them. The starting point in the documentation, which has both SQL Server 2005 and SQL Server 2008 branches, is at the following URL: http:/ / msdn.microsoft.com/en-us/library/ms188754.aspx.

set myHour to hours of (current date)

What I want to do is to share with you my most-often used DMVs, and some of the neat things you can do with them. First I will list and explain the objects I will use, and then I will show you some sample code that I currently use in my own production environments. I will also indicate which objects are new in SQL Server 2008.

$TRIN (Daily) 129

here:

Here is some background information on the views and functions that I will be using in sample code later in the chapter.

The first DMV I want to mention is sys.dm_os_sys_info, because I use it in many places further on. This view makes it easy to gather data about the underlying system, such as the amount of physical memory installed, the number of CPUs, and the number of buffers in the buffer pool. One of the important columns added in SQL Server 2008 is sqlserver_start_ time, which is useful in determining how much information is there when querying DMVs (because, as previously discussed, all of the data is discarded when the instance is restarted). When I am using SQL Server 2005, an easy workaround is to grab the created date/time of the tempdb database, or the login_time of spid 1 from sys. sysprocesses, both of which are reliable and usually close enough.

set myHour to hours of (current date) if myHour is less than 12 then set myGreeting to "Good morning!" else set myGreeting to "Good afternoon!" end if

under Type, there is a drop-down menu Click and change to Thin Line Click on Update to accept the changes 6 Note: You can also change the time period to three months (Under Range, there is a drop-down menu Change the default to Three Months )

sys.dm_exec_sessions, sys.dm_exec_requests, and sys.dm_exec_connections are a complex replacement for the old system table sysprocesses, the system procedure sp_who, and the famously undocumented and unsupported system procedure sp_who2. sys.dm_exec_sessions returns one row per authenticated session on SQL Server. Long-time DBAs can translate this to mean one row per SPID. Note that what we used to call a SPID is now referred to throughout all of the DMVs as session_id. The information provided here includes login information, host name, program name, status, environment settings, and metrics such as CPU, memory, and I/O used by the session. An important column that has been left out of this view is database_id. We used to be able to get this information for all SPIDs in sysprocesses, but now it is not accessible if the session_id does not have an active request (in which case you can get the information from other DMVs). Because of this, I continue to have to rely on sys.sysprocesses, which is provided for backward compatibility but in my opinion is still an essential view. sys.dm_exec_requests returns data for all of the requests currently active against the server. An important note here is that it is possible to have multiple rows for any given session_id (for example, when executing a query where the degree of parallelism (DOP) > 1). The data includes start time, status, type of command (for example,

distinguish between the afternoon and the evening, as shown in boldface here: