sp_who2 is a undocumented thus unsupported stroed procedure in SQL server, but widely used inststed of sp_who to list processes currently active in SQL Server. Both these procudures are designed to retrive same result set, however sp_who2 adds some extra columns which sp_who does not include.
What is sp_who2 in SQL Server?
sp_who2 also takes a optional parameter of a SPID. If a spid is passed, then the results of sp_who2 only show the row or rows of the executing SPID. There are four main things to look for when when diagnosing slowdowns. Multiple entries for the same SPID representing parallelism.
Why do DBAs run SP_who or sp_who2?
When a user complains about the database performance issue, the first thing DBAs do is run SP_Who or SP_Who2 to see what may be happening in SQL Server. Since the information returned is limited, DBAs use various scripts from other websites to add more misery to the problem.
What is SP_whatnow?
Sp_whatnow? sp_who, sp_who2 and sp_whoisactive are stored procedures that allow you to view current users, sessions, and processes within a SQL Server instance.
How to find out who is running what in SQL Server?
We’ve seen many DBAs scratch their head to find out who is running what in SQL Server. When a user complains about the database performance issue, the first thing DBAs do is run SP_Who or SP_Who2 to see what may be happening in SQL Server.
See 4 key topics from this page & related content
What is SP who2?
The stored procedure sp_who2 lists all current processes connected to a SQL Server : exec sp_who2. A typical resultset from Management Studio is : sp_who2 is one of the most useful and widely used stored procedures, along with its predecessor sp_who.
Why SP is used in SQL Server?
A stored procedure is a prepared SQL code that you can save, so the code can be reused over and over again. So if you have an SQL query that you write over and over again, save it as a stored procedure, and then just call it to execute it.
How do I see who is active in SQL?
Click the "activity monitor" icon in the toolbar. From Thorsten's comment: In SQL Server Management Studio, right click on Server, choose "Activity Monitor" from context menu -or- use keyboard shortcut Ctrl + Alt + A .
What is the use of '@' in SQL?
The @CustID means it's a parameter that you will supply a value for later in your code. This is the best way of protecting against SQL injection. Create your query using parameters, rather than concatenating strings and variables.
Can we join two stored procedure?
Here one stored proc gives one result set and another gives one result set... ( these sps return different columns except one column, one column is similar in both of them). Another alternative might be to convert the stored procedures into table functions -- especially inline table functions.
Why do we write stored procedures?
The main purpose of stored procedures to hide direct SQL queries from the code and improve performance of database operations such as select, update, and delete data.
How do I list all SQL Server Logins?
Answer: In SQL Server, there is a catalog view (ie: system view) called sys. sql_logins. You can run a query against this system view that returns all of the Logins that have been created in SQL Server as well as information about these Logins.
How do I check SQL connections?
How to test SQL server connection?Go to the command prompt window (Run→cmd)Enter sqlcmd and press enter.You now have a trusted connection to the default instance of SQL Server that is running on your computer. ... To end the sqlcmd session, type EXIT at the sqlcmd prompt.
How do I track user activity in SQL Server?
Viewing SQL Server Audit LogsIn SQL Server Management Studio, in the Object Explorer panel, expand Security and.Right-click the audit object that you want to view and select View Audit Logs from the menu.In the Log File Viewer, the logs will be displayed on the right side.More items...•
What is @@ in SQL?
In SQL Server, symbol @@ is prefixed to global variables. The server maintains all the global variables.
What are SQL data types?
Data types in SQL Server are organized into the following categories:Exact numerics. Unicode character strings.Approximate numerics. Binary strings.Date and time. Other data types.Character strings.bigint. numeric.bit. smallint.decimal. smallmoney.int. tinyint.More items...•
What does (*) mean in SQL?
The second part of a SQL query is the name of the column you want to retrieve for each record you are getting. You can obviously retrieve multiple columns for each record, and (only if you want to retrieve all the columns) you can replace the list of them with * , which means "all columns".
What are the two types of stored procedures?
Different Types of stored procedure sql ServerSystem Defined Stored Procedure. These stored procedures are already defined in SQL Server. ... Extended Procedure. Extended procedures provide an interface to external programs for various maintenance activities. ... User-Defined Stored Procedure. ... CLR Stored Procedure.
What is system stored procedure in SQL Server?
SQL Server stored procedure is a batch of statements grouped as a logical unit and stored in the database. The stored procedure accepts the parameters and executes the T-SQL statements in the procedure, returns the result set if any.
How are stored procedures called?
What is a Stored Procedure? A stored procedure is a group of one or more database statements housed in the database's data dictionary and called from either a remote program, another stored procedure, or the command line. We commonly call them SPROCS, or SP's.
What is the difference between a stored procedure and a function?
In a function, it is mandatory to use the RETURNS and RETURN arguments, whereas in a stored procedure is not necessary. In few words, a stored procedure is more flexible to write any code that you want, while functions have a rigid structure and functionality.
What is SQL Server?
Applies to: SQL Server (all supported versions) Provides information about current users, sessions, and processes in an instance of the Microsoft SQL Server Database Engine. The information can be filtered to return only those processes that are not idle, that belong to a specific user, or that belong to a specific session.
What permissions do you need to view SQL Server?
Requires VIEW SERVER STATE permission on the server to see all executing sessions on the instance of SQL Server. Otherwise, the user sees only the current session.
What is SQL Server Database Engine?
Provides information about current users, sessions, and processes in an instance of the Microsoft SQL Server Database Engine. The information can be filtered to return only those processes that are not idle, that belong to a specific user, or that belong to a specific session.
What is SP_Who2?
In general, Microsoft provided two system stored procedures called “sp_who” and “sp_who2” to retrieve all currently running processes on the instance but they lack much useful information that can facilitate the performance monitoring and analysis process, also they show much useless information (system processes).
What is sp_who?
As described in the official documentation, sp_who “provides information about current users, sessions, and processes in an instance of the Microsoft SQL Server Database Engine. The information can be filtered to return only those processes that are not idle, that belong to a specific user, or that belong to a specific session.”
How many sections are there in the help command?
As shown in the image above, the help command contains three sections:
Who is Hadi in SQL?
Hadi is an SQL Server professional with more than 10 years of experience. His main expertise is in data integration. He's one of the top ETL and SQL Server Integration Services contributors at Stackoverflow.com . Also, he published several article series about Biml, SSIS features, Search engines, Hadoop, and many other technologies.
Is SP_Who2 supported?
sp_Who2 is similar to sp_Who but it is not documented nor supported but it returns more information and performance counter from the current processes such as the program name executing the command, Disk IO, CPU Time, last batch execution time.
Can SQL agent jobs be used to periodically save running processes?
If we need to periodically save running processes information for further analysis, and since all output columns data types and name can be found within the procedure embedded documentation, we can create an SQL agent job that periodically executes sp_whoisactive procedure within an INSERT command such as:
What is sp_whatnow?
Sp_whatnow? sp_who, sp_who2 and sp_whoisactive are stored procedures that allow you to view current users, sessions, and processes within a SQL Server instance. You’d want to see this for identifying things like blocking or checking general activity.
What is sp_whoisactive?
sp_whoisactive is definitely one of my favourite stored procedures. Created by Adam Machanic, this tool gives you an instant view of current SQL user process. Similar to sp_who/sp_who2 but doesn’t show system processes and gives you more useful information.
How often does a stored proc run?
Another common use of this stored proc is to have it running as an agent job every 30-60 seconds, storing the results into a table. See my other blog post – Logging sp_whoisactive to a tablefor a run-through on that.
Can you run a select statement in a new query window?
Now run a select statement in a new query window on the same table. The insert has a lock on the table until committed, so it’ll continue to execute as a result of being blocked.
Does sp_whoisactive return results?
On rare occasions I’ve see my own exec sp_whoisactive SPID come back within the results. Likely it’ll depend on performance. You’ll know if your server is burning alive if running sp_whoisactive takes a long time to return results.
