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‎samples/demos/mssqltiger/Showplan/HashWarning.sql‎

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

‎samples/demos/mssqltiger/Showplan/MemoryGrant_Warning.sql‎

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

‎samples/demos/mssqltiger/Showplan/MemoryGrant_Warning_Setup.sql‎

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

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

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