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Pedro Lopes
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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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-- Create xEvent session
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DROP EVENT SESSION [HashSpills] ON SERVER
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GO
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CREATE EVENT SESSION [HashSpills] ON SERVER
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ADD EVENT sqlserver.hash_spill_details(
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ACTION(sqlserver.database_name,sqlserver.is_system,sqlserver.plan_handle,sqlserver.query_hash,sqlserver.query_plan_hash,sqlserver.session_nt_username,sqlserver.sql_text)),
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ADD EVENT sqlserver.hash_warning(
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ACTION(sqlserver.database_name,sqlserver.is_system,sqlserver.plan_handle,sqlserver.query_hash,sqlserver.query_plan_hash,sqlserver.session_nt_username,sqlserver.sql_text))
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--ADD TARGET package0.ring_buffer(SET max_memory=(25600))
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ADD TARGET package0.event_file(SET filename=N'C:\IP\Tiger\TR23\Demos\Demo 1.1 - Spills\HashSpills.xel',max_file_size=(50),max_rollover_files=(2))
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WITH (MAX_MEMORY=4096 KB,EVENT_RETENTION_MODE=ALLOW_SINGLE_EVENT_LOSS,MAX_DISPATCH_LATENCY=30 SECONDS,MAX_EVENT_SIZE=0 KB,MEMORY_PARTITION_MODE=NONE,TRACK_CAUSALITY=OFF,STARTUP_STATE=OFF)
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GO
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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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ALTER EVENT SESSION [HashSpills] ON SERVER STATE = START
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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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ALTER EVENT SESSION [HashSpills] ON SERVER STATE = STOP
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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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*/
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@@ -0,0 +1,38 @@
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-- Mem Grant xEvents
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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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-- Create xEvent session in 2016
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-- Detect inaccurate or insufficient memory grant, when grant is >5MB as minimum
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DROP EVENT SESSION [MemoryGrantXE] ON SERVER
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GO
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CREATE EVENT SESSION [MemoryGrantXE] ON SERVER
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/*
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ADD EVENT sqlserver.query_memory_grant_blocking(
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ACTION(sqlserver.database_name,sqlserver.is_system,sqlserver.plan_handle,sqlserver.query_hash,sqlserver.query_hash_signed,sqlserver.query_plan_hash,sqlserver.query_plan_hash_signed,sqlserver.session_nt_username,sqlserver.sql_text)),
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ADD EVENT sqlserver.query_memory_grant_resource_semaphores(
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ACTION(sqlserver.database_name,sqlserver.is_system,sqlserver.plan_handle,sqlserver.query_hash,sqlserver.query_hash_signed,sqlserver.query_plan_hash,sqlserver.query_plan_hash_signed,sqlserver.session_nt_username,sqlserver.sql_text)),
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ADD EVENT sqlserver.query_memory_grants(
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ACTION(sqlserver.database_name,sqlserver.is_system,sqlserver.plan_handle,sqlserver.query_hash,sqlserver.query_hash_signed,sqlserver.query_plan_hash,sqlserver.query_plan_hash_signed,sqlserver.session_nt_username,sqlserver.sql_text)),
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*/
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ADD EVENT sqlserver.query_memory_grant_usage(
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ACTION(sqlserver.database_name,sqlserver.is_system,sqlserver.plan_handle,sqlserver.query_hash,sqlserver.query_hash_signed,sqlserver.query_plan_hash,sqlserver.query_plan_hash_signed,sqlserver.session_nt_username,sqlserver.sql_text))
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ADD TARGET package0.event_file(SET filename=N'C:\IP\Tiger\TR23\Demos\Demo 1.2 - Memory Grant XE\MemoryGrant.xel',max_file_size=(20))
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WITH (MAX_MEMORY=4096 KB,EVENT_RETENTION_MODE=ALLOW_SINGLE_EVENT_LOSS,MAX_DISPATCH_LATENCY=30 SECONDS,MAX_EVENT_SIZE=0 KB,MEMORY_PARTITION_MODE=NONE,TRACK_CAUSALITY=OFF,STARTUP_STATE=OFF)
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GO
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-- Execute in 2016 for xEvent
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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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ALTER EVENT SESSION [MemoryGrantXE] ON SERVER STATE = START
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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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ALTER EVENT SESSION [MemoryGrantXE] ON SERVER STATE = STOP
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GO
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@@ -0,0 +1,71 @@
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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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@@ -0,0 +1,42 @@
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-- Make sure Optimize for Adhoc Workloads is not active if demo'ing - that is why mt demo failed.
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DROP EVENT SESSION [QueryProfileXE] ON SERVER
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GO
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CREATE EVENT SESSION [QueryProfileXE] ON SERVER
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ADD EVENT sqlserver.query_thread_profile(
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ACTION(sqlos.scheduler_id,sqlserver.database_id,sqlserver.is_system,sqlserver.plan_handle,sqlserver.query_hash_signed,sqlserver.query_plan_hash_signed,sqlserver.server_instance_name,sqlserver.session_id,sqlserver.session_nt_username,sqlserver.sql_text))
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ADD TARGET package0.event_file(SET filename=N'C:\Demos\QueryProfileXE.xel',max_file_size=(50),max_rollover_files=(2))
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--ADD TARGET package0.ring_buffer(SET max_memory=(25600))
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WITH (MAX_MEMORY=4096 KB,EVENT_RETENTION_MODE=ALLOW_SINGLE_EVENT_LOSS,MAX_DISPATCH_LATENCY=30 SECONDS,MAX_EVENT_SIZE=0 KB,MEMORY_PARTITION_MODE=NONE,TRACK_CAUSALITY=OFF,STARTUP_STATE=OFF)
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GO
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-- Get Actual Exec plan to compare to XE
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--USE AdventureWorks2014
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USE AdventureWorks2016CTP3
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GO
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DBCC FREEPROCCACHE
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GO
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ALTER EVENT SESSION [QueryProfileXE] ON SERVER STATE = START
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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 DESC
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OPTION (MAXDOP 1)
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GO
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ALTER EVENT SESSION [QueryProfileXE] ON SERVER STATE = STOP
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GO
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-- After running query, get plan handle and run below to see new columns in DMV
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SELECT * FROM sys.dm_exec_query_stats
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WHERE plan_handle = 0x0600050006F60819800281514E02000001000000000000000000000000000000000000000000000000000000
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GO
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-- And to get the plan from cache
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SELECT * FROM sys.dm_exec_query_plan(0x0600050006F60819800281514E02000001000000000000000000000000000000000000000000000000000000)
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GO
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-- After running query, get new signed query or query plan hash and run below to see new columns in DMV
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SELECT * FROM sys.dm_exec_query_stats
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WHERE CAST(query_hash AS BIGINT) = -5396503127623128976;
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--WHERE CAST(query_plan_hash AS BIGINT) = 3230654061787450360
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@@ -0,0 +1,33 @@
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-- Sort Spill
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-- Create xEvent session
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DROP EVENT SESSION [SortSpills] ON SERVER
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GO
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CREATE EVENT SESSION [SortSpills] ON SERVER
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ADD EVENT sqlserver.sort_warning(
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ACTION(sqlserver.database_name,sqlserver.is_system,sqlserver.plan_handle,sqlserver.query_hash,sqlserver.query_hash_signed,sqlserver.query_plan_hash,sqlserver.query_plan_hash_signed,sqlserver.session_nt_username,sqlserver.sql_text))
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ADD TARGET package0.event_file(SET filename=N'C:\IP\Tiger\TR23\Demos\Demo 1.1 - Spills\SortSpills.xel',max_file_size=(50),max_rollover_files=(2))
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WITH (MAX_MEMORY=4096 KB,EVENT_RETENTION_MODE=ALLOW_SINGLE_EVENT_LOSS,MAX_DISPATCH_LATENCY=30 SECONDS,MAX_EVENT_SIZE=0 KB,MEMORY_PARTITION_MODE=NONE,TRACK_CAUSALITY=OFF,STARTUP_STATE=OFF)
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GO
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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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ALTER EVENT SESSION [SortSpills] ON SERVER STATE = START
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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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ALTER EVENT SESSION [SortSpills] ON SERVER STATE = STOP
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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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