--Find SQL Server Objects which use index force

create table #tmp1 (DBName sysname,object_id int, name sysname, type varchar(3), type_desc varchar(50), OriginalText varchar(max), text varchar(max))

GO

 

insert #tmp1

      select db_name(),sm.object_id,o.name,o.type,o.type_desc

              ,definition as OriginalText

              ,replace(

                  replace(

                        replace(

                              replace(

                                    replace(

                                          replace(replace(upper(definition),' INDEX ','(INDEX')

                                    ,'INDEX ','(INDEX'),'   ','')

                              ,'CHARINDEX','')

                        ,'PATINDEX','')

                  ,'CHARINDEX','')

            ,'PATINDEX','') as text

      from sys.sql_modules sm

      left join sys.objects o on o.object_id=sm.object_id

      where o.type in ('AF','FN','P','IF','FS','FT','PC','RF','TA','TF','TR','V','X')

 

select *

from #tmp1 t

where t.text like '%(Index(%' or t.text like '%(Index=%'

order by t.name

 

To see the result set of the upper query let’s run the below demo.

--create a work database

Create database DBindexForce

GO

use DBindexForce

GO

--create a work table

Create table tblindexForce(col1 int, col2 char(10))

GO

create clustered index IX_1 on tblindexForce (col1)

GO

 

--Create 2 work SPs

--First one uses forced index

create proc mySP1

as

      select * from tblindexForce with(Index = IX_1)

GO

 

create proc mySP2

as

      select * from tblindexForce

GO

 

--Find SQL Server Objects which use index force

create table #tmp1 (DBName sysname,object_id int, name sysname, type varchar(3), type_desc varchar(50), OriginalText varchar(max), text varchar(max))

GO

 

insert #tmp1

      select db_name(),sm.object_id,o.name,o.type,o.type_desc

              ,definition as OriginalText

              ,replace(

                  replace(

                        replace(

                              replace(

                                    replace(

                                          replace(replace(upper(definition),' INDEX ','(INDEX')

                                    ,'INDEX ','(INDEX'),'   ','')

                              ,'CHARINDEX','')

                        ,'PATINDEX','')

                  ,'CHARINDEX','')

            ,'PATINDEX','') as text

      from sys.sql_modules sm

      left join sys.objects o on o.object_id=sm.object_id

      where o.type in ('AF','FN','P','IF','FS','FT','PC','RF','TA','TF','TR','V','X')

 

select *

from #tmp1 t

where t.text like '%(Index(%' or t.text like '%(Index=%'

order by t.name

 

--CleanUp

Use master

GO

drop table #tmp1

GO

drop database DBindexForce

GO

 

/*

Restore Paths Demo

 

Turgay Sahtiyan

Microsoft Senior SQL PFE

www.turgaysahtiyan.com

*/

 

/*

Backups have been taken in this order

 

Timeline    Backup Type       Backup Name

--------    -----------       -----------

t1                Full Backup       F1

t2                Diff Backup       D1

t3                TLog Backup       T1

t4                TLog Backup       T2

t5                Full Backup       F2

t6                Diff Backup       D2

t7                TLog Backup       T3

t8                TLog Backup       T4

t9                Diff Backup       D3

t10               TLog Backup       T5

t11               TLog Backup       T6

 

Valid Restore Paths

------------------------

Restore Path 1 : F2-D3-T5-T6

Restore Path 2 : F2-D2-T3-T4-T5-T6

Restore Path 3 : F2-T3-T4-T5-T6

Restore Path 4 : F1-D1-T1-T2-T3-T4-T5-T6

Restore Path 5 : F1-T1-T2-T3-T4-T5-T6

 

Some Invalid Restore Paths

-------------------------

F1-D3-T5-T6 (Because D3 differential backup needs F2 full backup)

F2-D3-T6 (Because T6 log backup needs T5 log backup)

 

*/

 

USE [master]

GO

 

--Create a folder (C:\SQLData) to store the databases

--Create a folder (C:\SQLBackup) to store the backup files

 

--Create Work Database

CREATE DATABASE db_RestorePath

GO

ALTER DATABASE db_RestorePath SET RECOVERY FULL

GO

USE db_RestorePath

GO

CREATE TABLE tbl_work(TimeLine char(3))

GO

 

--t1 - Full Backup - F1

INSERT tbl_work VALUES('t1')

GO

BACKUP DATABASE db_RestorePath TO DISK = 'C:\SQLBackup\F1.bak'

WITH INIT, NAME = 'F1'

GO

 

--t2 - Diff Backup - D1

INSERT tbl_work VALUES('t2')

GO

BACKUP DATABASE db_RestorePath TO DISK = 'C:\SQLBackup\D1.bak'

WITH  DIFFERENTIAL, INIT, NAME = 'D1'

GO

 

--t3 - TLog Backup - T1

INSERT tbl_work VALUES('t3')

GO

BACKUP LOG db_RestorePath TO DISK = 'C:\SQLBackup\T1.trn'

WITH INIT, NAME = 'T1'

GO

 

--t4 - TLog Backup - T2

INSERT tbl_work VALUES('t4')

GO

BACKUP LOG db_RestorePath TO DISK = 'C:\SQLBackup\T2.trn'

WITH INIT, NAME = 'T2'

GO

 

--t5 - Full Backup - F2

INSERT tbl_work VALUES('t5')

GO

BACKUP DATABASE db_RestorePath TO DISK = 'C:\SQLBackup\F2.bak'

WITH INIT, NAME = 'F2'

GO

 

--t6 - Diff Backup - D2

INSERT tbl_work VALUES('t6')

GO

BACKUP DATABASE db_RestorePath TO DISK = 'C:\SQLBackup\D2.bak'

WITH  DIFFERENTIAL, INIT, NAME = 'D2'

GO

 

--t7 - TLog Backup - T3

INSERT tbl_work VALUES('t7')

GO

BACKUP LOG db_RestorePath TO DISK = 'C:\SQLBackup\T3.trn'

WITH INIT, NAME = 'T3'

GO

 

--t8 - TLog Backup - T4

INSERT tbl_work VALUES('t8')

GO

BACKUP LOG db_RestorePath TO DISK = 'C:\SQLBackup\T4.trn'

WITH INIT, NAME = 'T4'

GO

 

--t9 - Diff Backup - D3

INSERT tbl_work VALUES('t9')

GO

BACKUP DATABASE db_RestorePath TO DISK = 'C:\SQLBackup\D3.bak'

WITH  DIFFERENTIAL, INIT, NAME = 'D3'

GO

 

--t10 - TLog Backup - T5

INSERT tbl_work VALUES('t10')

GO

BACKUP LOG db_RestorePath TO DISK = 'C:\SQLBackup\T5.trn'

WITH INIT, NAME = 'T5'

GO

 

--t11 - TLog Backup - T6

INSERT tbl_work VALUES('t11')

GO

BACKUP LOG db_RestorePath TO DISK = 'C:\SQLBackup\T6.trn'

WITH INIT, NAME = 'T6'

GO

 

-------------------------------

-----Valid Restore Paths-------

-------------------------------

 

--Restore Path 1

--Shortest Path

--Restore below backups

--F2-D3-T5-T6

USE [master]

RESTORE DATABASE [db_RestorePath1] FROM  DISK = N'C:\SQLBackup\F2.bak'

      WITH  MOVE N'db_RestorePath' TO N'C:\SQLData\db_RestorePath1.mdf'

            , MOVE N'db_RestorePath_log' TO N'C:\SQLData\db_RestorePath1_log.ldf'

            , NORECOVERY

RESTORE DATABASE [db_RestorePath1] FROM  DISK = N'C:\SQLBackup\D3.bak'

      WITH  NORECOVERY

RESTORE LOG [db_RestorePath1] FROM  DISK = N'C:\SQLBackup\T5.trn'

      WITH  NORECOVERY

RESTORE LOG [db_RestorePath1] FROM  DISK = N'C:\SQLBackup\T6.trn'

GO

--

USE db_RestorePath1

GO

select * from tbl_work

 

 

--Restore Path 2

--If you lost D3 differential backup, you can skip it

--Restore below backups

--F2-D2-T3-T4-T5-T6

USE [master]

RESTORE DATABASE [db_RestorePath2] FROM  DISK = N'C:\SQLBackup\F2.bak'

      WITH  MOVE N'db_RestorePath' TO N'C:\SQLData\db_RestorePath2.mdf'

            , MOVE N'db_RestorePath_log' TO N'C:\SQLData\db_RestorePath2_log.ldf'

            , NORECOVERY

RESTORE DATABASE [db_RestorePath2] FROM  DISK = N'C:\SQLBackup\D2.bak'

      WITH  NORECOVERY

RESTORE LOG [db_RestorePath2] FROM  DISK = N'C:\SQLBackup\T3.trn'

      WITH  NORECOVERY

RESTORE LOG [db_RestorePath2] FROM  DISK = N'C:\SQLBackup\T4.trn'

      WITH  NORECOVERY

RESTORE LOG [db_RestorePath2] FROM  DISK = N'C:\SQLBackup\T5.trn'

      WITH  NORECOVERY

RESTORE LOG [db_RestorePath2] FROM  DISK = N'C:\SQLBackup\T6.trn'

GO

--

USE db_RestorePath2

GO

select * from tbl_work

 

 

--Restore Path 3

--if you lost both D2 and D3 differential backups

--Restore below backups

--F2-T3-T4-T5-T6

USE [master]

RESTORE DATABASE [db_RestorePath3] FROM  DISK = N'C:\SQLBackup\F2.bak'

      WITH  MOVE N'db_RestorePath' TO N'C:\SQLData\db_RestorePath3.mdf'

            , MOVE N'db_RestorePath_log' TO N'C:\SQLData\db_RestorePath3_log.ldf'

            , NORECOVERY

RESTORE LOG [db_RestorePath3] FROM  DISK = N'C:\SQLBackup\T3.trn'

      WITH  NORECOVERY

RESTORE LOG [db_RestorePath3] FROM  DISK = N'C:\SQLBackup\T4.trn'

      WITH  NORECOVERY

RESTORE LOG [db_RestorePath3] FROM  DISK = N'C:\SQLBackup\T5.trn'

      WITH  NORECOVERY

RESTORE LOG [db_RestorePath3] FROM  DISK = N'C:\SQLBackup\T6.trn'

GO

--

USE db_RestorePath3

GO

select * from tbl_work

 

 

--Restore Path 4

--if you lost F2 Full backup

--Restore below backups

--F1-D1-T1-T2-T3-T4-T5-T6

USE [master]

RESTORE DATABASE [db_RestorePath4] FROM  DISK = N'C:\SQLBackup\F1.bak'

      WITH  MOVE N'db_RestorePath' TO N'C:\SQLData\db_RestorePath4.mdf'

            , MOVE N'db_RestorePath_log' TO N'C:\SQLData\db_RestorePath4_log.ldf'

            , NORECOVERY

RESTORE DATABASE [db_RestorePath4] FROM  DISK = N'C:\SQLBackup\D1.bak'

      WITH  NORECOVERY

RESTORE LOG [db_RestorePath4] FROM  DISK = N'C:\SQLBackup\T1.trn'

      WITH  NORECOVERY

RESTORE LOG [db_RestorePath4] FROM  DISK = N'C:\SQLBackup\T2.trn'

      WITH  NORECOVERY

RESTORE LOG [db_RestorePath4] FROM  DISK = N'C:\SQLBackup\T3.trn'

      WITH  NORECOVERY

RESTORE LOG [db_RestorePath4] FROM  DISK = N'C:\SQLBackup\T4.trn'

      WITH  NORECOVERY

RESTORE LOG [db_RestorePath4] FROM  DISK = N'C:\SQLBackup\T5.trn'

      WITH  NORECOVERY

RESTORE LOG [db_RestorePath4] FROM  DISK = N'C:\SQLBackup\T6.trn'

GO

--

USE db_RestorePath4

GO

select * from tbl_work

 

--Restore Path 5

--if you lost both F2 Full backup and D1 Differential backup

--Restore below backups

--F1-T1-T2-T3-T4-T5-T6

USE [master]

RESTORE DATABASE [db_RestorePath5] FROM  DISK = N'C:\SQLBackup\F1.bak'

      WITH  MOVE N'db_RestorePath' TO N'C:\SQLData\db_RestorePath5.mdf'

            , MOVE N'db_RestorePath_log' TO N'C:\SQLData\db_RestorePath5_log.ldf'

            , NORECOVERY

RESTORE LOG [db_RestorePath5] FROM  DISK = N'C:\SQLBackup\T1.trn'

      WITH  NORECOVERY

RESTORE LOG [db_RestorePath5] FROM  DISK = N'C:\SQLBackup\T2.trn'

      WITH  NORECOVERY

RESTORE LOG [db_RestorePath5] FROM  DISK = N'C:\SQLBackup\T3.trn'

      WITH  NORECOVERY

RESTORE LOG [db_RestorePath5] FROM  DISK = N'C:\SQLBackup\T4.trn'

      WITH  NORECOVERY

RESTORE LOG [db_RestorePath5] FROM  DISK = N'C:\SQLBackup\T5.trn'

      WITH  NORECOVERY

RESTORE LOG [db_RestorePath5] FROM  DISK = N'C:\SQLBackup\T6.trn'

GO

--

USE db_RestorePath5

GO

select * from tbl_work

 

 

 

 

-------------------------------

-----Invalid Restore Paths-------

-------------------------------

--F1-D3-T5-T6

--D3 differential backup needs F2 full backup

USE [master]

RESTORE DATABASE [db_RestorePath6] FROM  DISK = N'C:\SQLBackup\F1.bak'

      WITH  MOVE N'db_RestorePath' TO N'C:\SQLData\db_RestorePath6.mdf'

            , MOVE N'db_RestorePath_log' TO N'C:\SQLData\db_RestorePath6_log.ldf'

            , NORECOVERY

RESTORE DATABASE [db_RestorePath6] FROM  DISK = N'C:\SQLBackup\D3.bak'

      WITH  NORECOVERY

RESTORE LOG [db_RestorePath6] FROM  DISK = N'C:\SQLBackup\T5.trn'

      WITH  NORECOVERY

RESTORE LOG [db_RestorePath6] FROM  DISK = N'C:\SQLBackup\T6.trn'

GO

--Analyze the error message

--This differential backup cannot be restored because the database

--has not been restored to the correct earlier state.

 

 

--F2-D3-T6

--T6 log backup needs T5 log backup

USE [master]

RESTORE DATABASE [db_RestorePath7] FROM  DISK = N'C:\SQLBackup\F2.bak'

      WITH  MOVE N'db_RestorePath' TO N'C:\SQLData\db_RestorePath7.mdf'

            , MOVE N'db_RestorePath_log' TO N'C:\SQLData\db_RestorePath7_log.ldf'

            , NORECOVERY

RESTORE DATABASE [db_RestorePath7] FROM  DISK = N'C:\SQLBackup\D3.bak'

      WITH  NORECOVERY

RESTORE LOG [db_RestorePath7] FROM  DISK = N'C:\SQLBackup\T6.trn'

GO

--Analyze the error message

--The log in this backup set begins at LSN 31000000025100001, which is

--too recent to apply to the database. An earlier log backup that includes

--LSN 31000000025000001 can be restored.

 

 

----Drop Work Databases

--DROP DATABASE db_RestorePath

--DROP DATABASE db_RestorePath1

--DROP DATABASE db_RestorePath2

--DROP DATABASE db_RestorePath3

--DROP DATABASE db_RestorePath4

--DROP DATABASE db_RestorePath5

--DROP DATABASE db_RestorePath6

--DROP DATABASE db_RestorePath7

 

 

Use AdventureWorks2012

GO

 

--DO NOT RUN this script on Production environment

--Clear the plan cache

dbcc freeproccache

 

--Use EXEC to execute a TSQL string

declare @str varchar(max)='',

            @param1 varchar(50)='',

            @param2 varchar(50)=''

set @param1='1'

set @param2='2'

set @str='select * from Person.Address where AddressID in ('+@param1+','+@param2+')'

exec(@str)

 

--Execute the same query with different paramaters

declare @str varchar(max)='',

            @param1 varchar(50)='',

            @param2 varchar(50)=''

set @param1='3'

set @param2='4'

set @str='select * from Person.Address where AddressID in ('+@param1+','+@param2+')'

exec(@str)

 

--Look at the cached query plans

select st.text,*

from sys.dm_exec_cached_plans cp

cross apply sys.dm_exec_sql_text(cp.plan_handle) st

where (st.text like '%select * from Person.Address%')

and st.text not like '%select st.text%'

 

--Let's do same example with sp_executesql

 

Use AdventureWorks2012

GO

 

--DO NOT RUN this script on Production environment

--Clear the plan cache

dbcc freeproccache

 

--sp_executesql 1

declare @param1 int,

          @param2 int

set @param1=1

set @param2=2

exec sp_executesql N'select * from Person.Address where AddressID in (@1,@2)'

            ,N'@1 int, @2 int'

            ,@param1, @param2

           

--sp_executesql 2

declare @param1 int,

          @param2 int

set @param1=3

set @param2=4

exec sp_executesql N'select * from Person.Address where AddressID in (@1,@2)'

            ,N'@1 int, @2 int'

            ,@param1, @param2

           

--Look at the cached query plans

select st.text,*

from sys.dm_exec_cached_plans cp

cross apply sys.dm_exec_sql_text(cp.plan_handle) st

where (st.text like '%select * from Person.Address%')

and st.text not like '%select st.text%'       

  

/*

Turgay Sahtiyan - Microsoft SQL Server Premier Field Engineer

 

Blog : www.turgaysahtiyan.com

Twitter : @turgaysahtiyan

 

*/

 

--Data Mismatch on Where Clause

 

--Create a work database

create database DBDataMismatch

GO

use DBDataMismatch

GO

 

--Create a work table

create table tblDataMismatch(ID int identity(1,1),Col1 varchar(10))

GO

 

--Populate it with 10.000 records

declare @i int=0

while @i<10000 begin

  insert tblDataMismatch

    select cast(@i as varchar(10))

  set @i=@i+1

end

 

--Create a clustered index on ID column

Create Clustered Index CI_1 on tblDataMismatch(ID)

 

--Create a nonclustered index on col1 column

Create NonClustered Index IX_1 on tblDataMismatch(Col1)

 

 

--Work table is ready

select * from tblDataMismatch

 

--This query does index seek

select * from tblDataMismatch

Where Col1 = '111'

 

--But this one does index scan because there is a data mismatch and col1 is selected to convert

select * from tblDataMismatch

Where Col1 = 111

 

--This also does index scan

declare @value NVarchar(10)='111'

 

select * from tblDataMismatch

Where Col1 = @Value

 

--Drop work database

use master

go

drop database DBDataMismatch

 

/*

Turgay Sahtiyan - Microsoft SQL Server Premier Field Engineer

 

Blog : www.turgaysahtiyan.com

Twitter : @turgaysahtiyan

 

*/

 

--Applying Functions on Where Clause Columns

 

--Create a work database with Latin1_General_CI_AS Collation

Create Database DBCollate COLLATE Latin1_General_CI_AS

GO

Use DBCollate

GO

 

--Create a work table

create table tbl1(a varchar(37), b char(400))

GO

 

--Populate it with 10.000 records

declare @i int=0

declare @a char(37)

while @i<10000 begin

  select @a=CAST(NEWID() as CHAR(37))

  insert tbl1

    select @a,REPLICATE('b',400)   

  set @i=@i+1

end

 

--Create a clustered index on column a

Create Clustered Index CX_1 on tbl1(a)

 

 

use DBCollate

GO

 

/*****************************************

--Sample 1 : Collate

*****************************************/

 

--Compare the query plans of the below queries

--CTRL+M

 

--Query 1 - index seek

select * from tbl1

where a = 'F0166605-4683-44AB-A859-0A98FFD337B9'

--Query 2 - index scan

select * from tbl1

where a = 'F0166605-4683-44AB-A859-0A98FFD337B9' COLLATE TURKISH_CI_AS

 

 

/*****************************************

Sample 2 : LTRIM - RTRIM

*****************************************/

 

--This query normally does index seek

select * from tbl1

where a ='F0166605-4683-44AB-A859-0A98FFD337B9'

 

--LTRIM : Index Scan

select * from tbl1

where LTRIM(a) ='F0166605-4683-44AB-A859-0A98FFD337B9'

 

--RTRIM : Index Scan

select * from tbl1

where RTRIM(a) ='F0166605-4683-44AB-A859-0A98FFD337B9'

 

 

/*****************************************

Sample 3 : Substring - Left

*****************************************/

--Substring : Index Scan

select * from tbl1

where substring(a,1,1) ='F'

 

--Substring : Index Scan

select * from tbl1

where left(a,1) ='F'

 

--Below query is exactly same with the substring one.

--But this guy does index seek

select * from tbl1

where a  like 'F%'

 

--drop work database

use master

go

drop database DBCollate