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Note that if you run this query you probably won't get exactly 1000 rows. I'll explain why shortly. You can specify TABLESAMPLE on a table-by-table basis. Following the TABLESAMPLE keyword, you can optionally specify the sampling method to use. Currently, SQL Server supports only the SYSTEM method, which is also the default if no method is specified. In the future, we might see additional algorithms. Per ANSI, the SYSTEM keyword represents an implementation-dependent sampling method. This means that you will find different algorithms implemented in different products when using the SYSTEM method. In SQL Server, the SYSTEM method implements the same sampling algorithm used to sample pages to generate statistics. You can use either the ROWS or the PERCENT keyword to specify how many rows you would like to get back. Based on your inputs, SQL Server will calculate random values to figure out whether or not a page should be returned. Note that the decision of whether or not to read a portion of data is done at the page level. This fact, along with the fashion in which SQL Server determines whether or not to

DECLARE @root AS INT = 3; WITH Subs AS ( -- Anchor member returns root node SELECT empid, empname, 0 AS lvl FROM dbo.Employees WHERE empid = @root UNION ALL -- Recursive member returns next level of children SELECT C.empid, C.empname, P.lvl + 1 FROM Subs AS P JOIN dbo.Employees AS C ON C.mgrid = P.empid ) SELECT * FROM Subs;

CREATE EVENT SESSION High_Logical_Read_Queries ON SERVER ADD EVENT sqlserver.sql_statement_completed (ACTION (sqlserver.database_id, sqlserver.sql_text) WHERE reads > 4000) ADD TARGET package0.asynchronous_file_target (SET filename=N'c:\temp\High_Logical_Read_Queries.xel') WITH (MAX_DISPATCH_LATENCY = 1 SECONDS);

This code generates the following output:

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pick a page based on a random factor, means that you won't necessarily get the exact number of rows that you asked for; rather, you'll get a fairly close value. The more rows you request, the more likely you are to get a result set size close to what you requested. Here's an example for using the TABLESAMPLE clause in a query against the Orders table, requesting 1,000 rows: SET NOCOUNT ON; USE Performance; SELECT * FROM dbo.Orders TABLESAMPLE SYSTEM (1000 ROWS);

We have called our event session High_Logical_Read_Queries and declared that it applies at the SERVER level . This is currently the only allowable level for event sessions . To simulate an event session at the database level, we can filter a server-level session on the database_id column returned by the sqlserver package . To be useful, the event session needs at least one event and at least one target . We have selected the sql_statement_completed event exposed by the sqlserver package . Whenever this event occurs, we need additional actions to occur, as we need more information than is collected in the standard columns . We have requested that the database_id and sql_text columns are also populated, via actions also exposed by the sqlserver package . To avoid excessive event records, we have specified a predicate to limit the records to those with a reads value higher than 4,000 . As shown earlier, there are a number of permissible targets, but for general production use, the asynchronous_file_target exposed by the package0 package is likely to be the most commonly used, because it has minimal impact on the production processing . In this case we have specified that it should write to a file with an .xel extension and that the event data should be written with a maximum latency of 1 second . (Note that the syntax requires the term SECONDS without a singular option .) We can now start our event session by executing the following command:

empid ----------3 7 9 11 12 13 14 empname ------------------------Ina Aaron Rita Gabriel Emilia Michael Didi lvl ----------0 1 2 2 3 3 3

The solution applies very similar logic to the UDF implementation It s simpler in the sense that you don t need to explicitly de ne the returned table or to lter the previous level s managers The rst query in the CTE s body returns the row from Employees for the given root employee It also returns zero as the level of the root employee In a recursive CTE, a query that doesn t have any recursive references is known as an anchor member The second query in the CTE s body (following the UNION ALL set operation) has a recursive reference to the CTE s name This makes it a recursive member, and it is treated in a special manner The recursive reference to the CTE s name (Subs) represents the result set returned previously.

ALTER EVENT SESSION High_Logical_Read_Queries ON SERVER STATE = START;

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