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samples/demos/mssqltiger/Showplan/HashWarning.sql

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+-- Param Sniffing with Hash Spill
+
+-- Setup
+--USE AdventureWorks2014
+USE AdventureWorks2016CTP3
+GO
+DROP TABLE CustomersState
+GO
+CREATE TABLE CustomersState (CustomerID int PRIMARY KEY, [Address] CHAR(200), [State] CHAR(2))
+GO
+INSERT INTO CustomersState (CustomerID, [Address]) 
+SELECT CustomerID, 'Address' FROM Sales.Customer
+GO
+UPDATE CustomersState SET [State] = 'NY' WHERE CustomerID % 100 <> 1
+UPDATE CustomersState SET [State] = 'WA' WHERE CustomerID % 100 = 1
+GO
+
+UPDATE STATISTICS CustomersState WITH FULLSCAN
+GO
+
+CREATE PROCEDURE CustomersByState @State CHAR(2) AS
+BEGIN
+	DECLARE @CustomerID int
+	SELECT @CustomerID = e.CustomerID FROM Sales.Customer e
+	INNER JOIN CustomersState es ON e.CustomerID = es.CustomerID
+	WHERE es.[State] = @State
+	OPTION (MAXDOP 1)
+END
+GO
+
+-- Get Actual Execution Plan
+ 
+-- Execute the stored procedure first with parameter value ‘WA’ – which will select 1% of data. 
+DBCC FREEPROCCACHE
+GO
+EXEC CustomersByState 'WA'
+GO
+
+EXEC CustomersByState 'NY'
+GO
+
+/*
+Observe the type of Spill = Recursion
+Occurs when the build input does not fit into available memory, 
+resulting in the split of input into multiple partitions that are processed separately.	
+
+If any of these partitions still do not fit into available memory, 
+it is split into sub-partitions, which are also processed separately. 
+This splitting process continues until each partition fits into available memory 
+or until the maximum recursion level is reached.
+In this case it stopped at level 1.
+*/

samples/demos/mssqltiger/Showplan/MemoryGrant_Warning.sql

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+-- Mem Grant Warning
+
+-- Added MIN_GRANT_PERCENT for repro on SQL 2014 SP2 and 2016 only, because fix for this scenario is in those releases.
+
+--Execute in 2014 for warning; coming soon for 2016
+USE [memgrants]
+GO
+DBCC FREEPROCCACHE
+GO
+SELECT o.col3, o.col2, d.col2
+FROM orders o
+JOIN orders_detail d ON o.col2 = d.col1
+WHERE o.col3 <= 8000
+OPTION (LOOP JOIN, MAXDOP 1, MIN_GRANT_PERCENT = 20)
+GO
+
+/*
+In SELECT node properties:
+MaxQueryMemory for maximum query memory grant under RG MAX_MEMORY_PERCENT hint
+MaxCompileMemory for maximum query optimizer memory in KB during compile under RG
+*/

samples/demos/mssqltiger/Showplan/MemoryGrant_Warning_Setup.sql

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+USE [master]
+GO
+IF NOT EXISTS (SELECT name FROM sys.databases WHERE name = N'memgrants')
+CREATE DATABASE [memgrants]
+GO
+
+USE [memgrants]
+GO
+
+IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[orders]') AND type in (N'U'))
+BEGIN
+CREATE TABLE [dbo].[orders](
+	[col1] [int] NOT NULL,
+	[col2] [int] NULL,
+	[col3] [int] NULL,
+PRIMARY KEY CLUSTERED 
+(
+	[col1] ASC
+)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
+) ON [PRIMARY]
+END
+GO
+
+SET NOCOUNT ON
+GO
+DECLARE @x int
+SET @x = 0
+WHILE (@x < 10000000)
+BEGIN
+	INSERT INTO [dbo].[orders] VALUES (@x, @x, @x)
+	SET @x = @x + 1
+END
+GO
+
+IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[orders_detail]') AND type in (N'U'))
+BEGIN
+CREATE TABLE [dbo].[orders_detail](
+	[col1] [int] NULL,
+	[col2] [int] NULL,
+	[col3] [char](5000) NOT NULL
+) ON [PRIMARY]
+END
+GO
+
+DECLARE @x int
+DECLARE @y int
+SET @x = 0
+SET @y = 1
+WHILE (@x < 10000)
+BEGIN
+	INSERT INTO [dbo].[orders_detail] VALUES (@x, @y, 'x')
+	IF ((@y % 100) = 0)
+	BEGIN
+		SET @y = 1
+		SET @x = @x + 1
+	END
+	SET @y = @y + 1
+END
+GO
+
+SET NOCOUNT OFF
+GO
+
+IF NOT EXISTS (SELECT * FROM sys.indexes WHERE object_id = OBJECT_ID(N'[dbo].[orders_detail]') AND name = N'od_cl_idx')
+CREATE UNIQUE CLUSTERED INDEX [od_cl_idx] ON [dbo].[orders_detail]
+(
+	[col1] ASC,
+	[col2] ASC
+)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
+GO
+

samples/demos/mssqltiger/Showplan/SortWarning.sql

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+-- Sort Spill
+
+-- Get Actual Execution Plan
+
+USE AdventureWorks2014
+--USE AdventureWorks2016CTP3
+GO 
+--Execute  
+DBCC FREEPROCCACHE
+GO
+SELECT *
+FROM Sales.SalesOrderDetail SOD
+INNER JOIN Production.Product P ON SOD.ProductID = P.ProductID
+ORDER BY Style
+OPTION (QUERYTRACEON 9481)
+GO
+
+/*
+Observe the type of Spill = 1
+Means one pass over the data was enough to complete the sort in the Worktable
+*/