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---------------------------------------------------------------------- Function: Subordinates1, Descendants --- Input : @root INT: Manager id --- Output : @Subs Table: id and level of subordinates of -input manager (empid = @root) in all levels --- Process : * Insert into @Subs row of input manager -* In a loop, while previous insert loaded more than 0 rows -insert into @Subs next level of subordinates --------------------------------------------------------------------USE tempdb; GO IF OBJECT_ID('dbo.Subordinates1') IS NOT NULL DROP FUNCTION dbo.Subordinates1; GO CREATE FUNCTION dbo.Subordinates1(@root AS INT) RETURNS @Subs TABLE ( empid INT NOT NULL PRIMARY KEY NONCLUSTERED, lvl INT NOT NULL, UNIQUE CLUSTERED(lvl, empid) -- Index will be used to filter level ) AS BEGIN DECLARE @lvl AS INT = 0; -- Initialize level counter with 0 -- Insert root node into @Subs INSERT INTO @Subs(empid, lvl) SELECT empid, @lvl FROM dbo.Employees WHERE empid = @root; WHILE @@rowcount > 0 -- while previous level had rows

SET NOCOUNT ON; USE Performance; GO IF OBJECT_ID('dbo.BigSessions') IS NOT NULL DROP TABLE dbo.BigSessions; GO SELECT IDENTITY(int, 1, 1) AS keycol, D.*, DATEADD( second, 1 + ABS(CHECKSUM(NEWID())) % (20*60), starttime) AS endtime INTO dbo.BigSessions FROM ( SELECT 'app' + CAST(1 + ABS(CHECKSUM(NEWID())) % 10 AS VARCHAR(10)) AS app, 'user1' AS usr, 'host1' AS host, DATEADD( second, 1 + ABS(CHECKSUM(NEWID())) % (30*24*60*60), '20040101') AS starttime FROM dbo.Nums WHERE n <= 1000000 ) AS D; ALTER TABLE dbo.BigSessions ADD CONSTRAINT PK_BigSessions PRIMARY KEY(keycol); CREATE INDEX idx_nc_app_st_et ON dbo.BigSessions(app, starttime, endtime);

map_key ----------1 2 3 4 5 6 7 8 map_value ----------------------------------Transaction Cursor Session SharedXactWorkspace ExclusiveXactWorkspace WaitForResultsNotificationObject LockTableIterator LastLockInfoOwner

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-- Insert next level of subordinates to @Subs INSERT INTO @Subs(empid, lvl) SELECT C.empid, @lvl FROM @Subs AS P -- P = Parent JOIN dbo.Employees AS C -- C = Child ON P.lvl = @lvl - 1 -- Filter parents from previous level AND C.mgrid = P.empid; END RETURN; END GO

The function accepts the @root input parameter, which is the ID of the requested subtree s root employee. The function returns the @Subs table variable, with all subordinates of employee with ID = @root in all levels. Besides containing the employee attributes, @Subs also has a column called lvl that keeps track of the level in the subtree (0 for the subtree s root and increasing from there by 1 in each iteration). The function s code keeps track of the current level being handled in the @lvl local variable, which is initialized with zero. The function s code rst inserts into @Subs the row from Employees where empid = @root. Then in a loop, while the last insert affects more than zero rows, the code increments the @lvl variable s value by one and inserts into @Subs the next level of employees in other words, direct subordinates of the managers inserted in the previous level. To insert the next level of employees into @Subs, the query in the loop joins @Subs (representing managers) with Employees (representing subordinates). The lvl column is important because it allows you to isolate the managers that were inserted into @Subs in the last iteration. To return only subordinates of the previously inserted managers, the join condition lters from @Subs only rows where the lvl column is equal to the previous level (@lvl 1). To test the function, run the following code, which returns the subordinates of employee 3:

If you saw the value 2 being returned for a lock owner type, you could examine this view to determine that a cursor owned the lock .

I populated the table with sessions that start at random times over a period of one month and that last up to 20 minutes. I also distributed 10 different application names randomly. Now request an estimated execution plan for the original query and you will get the plan shown in Figure 3-61.

SELECT empid, lvl FROM dbo.Subordinates1(3) AS S;

The final object that we need to be familiar with is the target . Event records are sent to targets . You can see the available targets by executing the following query:

This code generates the following output:

FROM sys.dm_xe_packages AS dxp INNER JOIN sys.dm_xe_objects AS dxo ON dxp.[guid] = dxo.package_guid WHERE dxo.object_type = 'target' ORDER BY Package,TargetName;

Figure 3-61. Estimated execution plan for query against the BigSessions table with adequate sample data

empid ----------3 7 9 11 12 13 14 lvl ----------0 1 2 2 3 3 3

12

This query returns the following list of targets (wrapped for clarity):

You can verify that the output is correct by examining Figure 12-2 and following the subtree of the root employee (ID = 3). To get other attributes of the employees besides just the employee ID, you can either rewrite the function and add those attributes to the @Subs table or simply join the function with the Employees table, like so:

[View full size image]

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