code 128 check digit c# A brief list of my favorite DMVs and DMFs in Visual C#

Encode Code128 in Visual C# A brief list of my favorite DMVs and DMFs

A brief list of my favorite DMVs and DMFs
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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.
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A brief list of my favorite DMVs and DMFs
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Here is some background information on the views and functions that I will be using in sample code later in the chapter.
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sys.dm_os_sys_info
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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.
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sys.dm_exec_sessions, sys.dm_exec_requests, and sys.dm_exec_connections
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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,
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My favorite DMVs, and why
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SELECT), and database information, and provides hooks that make it possible to determine the query being executed (or object being called). The data also includes blocking information, environment settings in place when the request started, and the CPU, memory, and I/O required by the request. Finally, in some scenarios (for example, BACKUP DATABASE) the view exposes how far along the process is, and the estimated completion time. In SQL Server 2008, there is also a group_id column for Resource Governor information, and the same query_plan and query_plan_hash columns that were added to sys.dm_exec_query_text. sys.dm_exec_connections provides details about each connection attached to SQL Server. This includes connection time, protocol information, authentication method, and IP address. Note that sys.sysprocesses is still provided for backward compatibility purposes. As I mentioned before, this is a good thing in certain scenarios, this is the only place where database context is provided. I use these DMVs almost exclusively as a package deal to create stored procedures that allow me to provide relational data about specific things that are going on in my instances that would otherwise require a lot of digging. Later I will show my own version of sp_who, which is much richer than what is provided out of the box.
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