List indexes with keys by table

Note: Code borrowed from:

https://stackoverflow.com/questions/765867/list-of-all-index-index-columns-in-sql-server-db

... and modified to suit my needs.

SELECT
  schema_name(schema_id) as SchemaName, OBJECT_NAME(si.object_id) as TableName, si.name as IndexName,
  (CASE is_primary_key WHEN 1 THEN 'PK' ELSE '' END) as PK,
  (CASE is_unique WHEN 1 THEN '1' ELSE '0' END)+' '+
  (CASE si.type WHEN 1 THEN 'C' WHEN 3 THEN 'X' ELSE 'B' END)+' '+  -- B=basic, C=Clustered, X=XML
  (CASE INDEXKEY_PROPERTY(si.object_id,index_id,1,'IsDescending') WHEN 0 THEN 'A' WHEN 1 THEN 'D' ELSE '' END)+
  (CASE INDEXKEY_PROPERTY(si.object_id,index_id,2,'IsDescending') WHEN 0 THEN 'A' WHEN 1 THEN 'D' ELSE '' END)+
  (CASE INDEXKEY_PROPERTY(si.object_id,index_id,3,'IsDescending') WHEN 0 THEN 'A' WHEN 1 THEN 'D' ELSE '' END)+
  (CASE INDEXKEY_PROPERTY(si.object_id,index_id,4,'IsDescending') WHEN 0 THEN 'A' WHEN 1 THEN 'D' ELSE '' END)+
  (CASE INDEXKEY_PROPERTY(si.object_id,index_id,5,'IsDescending') WHEN 0 THEN 'A' WHEN 1 THEN 'D' ELSE '' END)+
  (CASE INDEXKEY_PROPERTY(si.object_id,index_id,6,'IsDescending') WHEN 0 THEN 'A' WHEN 1 THEN 'D' ELSE '' END)+
  '' as 'Type',
  INDEX_COL(schema_name(schema_id)+'.'+OBJECT_NAME(si.object_id),index_id,1) as Key1,
  INDEX_COL(schema_name(schema_id)+'.'+OBJECT_NAME(si.object_id),index_id,2) as Key2,
  INDEX_COL(schema_name(schema_id)+'.'+OBJECT_NAME(si.object_id),index_id,3) as Key3,
  INDEX_COL(schema_name(schema_id)+'.'+OBJECT_NAME(si.object_id),index_id,4) as Key4,
  INDEX_COL(schema_name(schema_id)+'.'+OBJECT_NAME(si.object_id),index_id,5) as Key5,
  INDEX_COL(schema_name(schema_id)+'.'+OBJECT_NAME(si.object_id),index_id,6) as Key6
FROM sys.indexes as si
LEFT JOIN sys.objects as so on so.object_id=si.object_id
WHERE index_id>0 -- omit the default heap
  and OBJECTPROPERTY(si.object_id,'IsMsShipped')=0 -- omit system tables
  and not (schema_name(schema_id)='dbo' and OBJECT_NAME(si.object_id)='sysdiagrams') -- omit sysdiagrams
ORDER BY SchemaName ,TableName , Key1, Key2, Key3, Key4, Key5, Key6

This version excludes tables with only one index:

SELECT

  schema_name(schema_id) as SchemaName, OBJECT_NAME(si.object_id) as TableName, si.name as IndexName,

  (CASE is_primary_key WHEN 1 THEN 'PK' ELSE '' END) as PK,

  (CASE is_unique WHEN 1 THEN '1' ELSE '0' END)+' '+

  (CASE si.type WHEN 1 THEN 'C' WHEN 3 THEN 'X' ELSE 'B' END)+' '+  -- B=basic, C=Clustered, X=XML

  (CASE INDEXKEY_PROPERTY(si.object_id,index_id,1,'IsDescending') WHEN 0 THEN 'A' WHEN 1 THEN 'D' ELSE '' END)+

  (CASE INDEXKEY_PROPERTY(si.object_id,index_id,2,'IsDescending') WHEN 0 THEN 'A' WHEN 1 THEN 'D' ELSE '' END)+

  (CASE INDEXKEY_PROPERTY(si.object_id,index_id,3,'IsDescending') WHEN 0 THEN 'A' WHEN 1 THEN 'D' ELSE '' END)+

  (CASE INDEXKEY_PROPERTY(si.object_id,index_id,4,'IsDescending') WHEN 0 THEN 'A' WHEN 1 THEN 'D' ELSE '' END)+

  (CASE INDEXKEY_PROPERTY(si.object_id,index_id,5,'IsDescending') WHEN 0 THEN 'A' WHEN 1 THEN 'D' ELSE '' END)+

  (CASE INDEXKEY_PROPERTY(si.object_id,index_id,6,'IsDescending') WHEN 0 THEN 'A' WHEN 1 THEN 'D' ELSE '' END)+

  '' as 'Type',

  INDEX_COL(schema_name(schema_id)+'.'+OBJECT_NAME(si.object_id),index_id,1) as Key1,

  INDEX_COL(schema_name(schema_id)+'.'+OBJECT_NAME(si.object_id),index_id,2) as Key2,

  INDEX_COL(schema_name(schema_id)+'.'+OBJECT_NAME(si.object_id),index_id,3) as Key3,

  INDEX_COL(schema_name(schema_id)+'.'+OBJECT_NAME(si.object_id),index_id,4) as Key4,

  INDEX_COL(schema_name(schema_id)+'.'+OBJECT_NAME(si.object_id),index_id,5) as Key5,

  INDEX_COL(schema_name(schema_id)+'.'+OBJECT_NAME(si.object_id),index_id,6) as Key6

FROM sys.indexes as si

LEFT JOIN sys.objects as so on so.object_id=si.object_id

WHERE index_id>0 -- omit the default heap

  and OBJECTPROPERTY(si.object_id,'IsMsShipped')=0 -- omit system tables

  and not (schema_name(schema_id)='dbo' and OBJECT_NAME(si.object_id)='sysdiagrams') -- omit sysdiagrams

  and so.object_id in (select object_id  from sys.indexes group by object_id having count(object_id) > 1)

ORDER BY SchemaName ,TableName , Key1, Key2, Key3, Key4, Key5, Key6

Excessive compile times

This code was brought to my attention by an associate, Valentin Iamandi, who mentioned it was from Jonathan Kehayias ... we have a client who may be victim of a SQL Server compilation bug (3 seconds compile time, 75ms execution time, this is to identify other potential victims.

-- Find high compile resource plans in the plan cache

SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;

WITH XMLNAMESPACES 

(DEFAULT 'http://schemas.microsoft.com/sqlserver/2004/07/showplan')

SELECT TOP 10

CompileTime_ms,

CompileCPU_ms,

CompileMemory_KB,

qs.execution_count,

qs.total_elapsed_time/1000 AS duration_ms,

qs.total_worker_time/1000 as cputime_ms,

(qs.total_elapsed_time/qs.execution_count)/1000 AS avg_duration_ms,

(qs.total_worker_time/qs.execution_count)/1000 AS avg_cputime_ms,

qs.max_elapsed_time/1000 AS max_duration_ms,

qs.max_worker_time/1000 AS max_cputime_ms,

SUBSTRING(st.text, (qs.statement_start_offset / 2) + 1,

(CASE qs.statement_end_offset

WHEN -1 THEN DATALENGTH(st.text)

ELSE qs.statement_end_offset

END - qs.statement_start_offset) / 2 + 1) AS StmtText,

query_hash,

query_plan_hash

FROM

(

SELECT 

c.value('xs:hexBinary(substring((@QueryHash)[1],3))', 'varbinary(max)') AS QueryHash,

c.value('xs:hexBinary(substring((@QueryPlanHash)[1],3))', 'varbinary(max)') AS QueryPlanHash,

c.value('(QueryPlan/@CompileTime)[1]', 'int') AS CompileTime_ms,

c.value('(QueryPlan/@CompileCPU)[1]', 'int') AS CompileCPU_ms,

c.value('(QueryPlan/@CompileMemory)[1]', 'int') AS CompileMemory_KB,

qp.query_plan

FROM sys.dm_exec_cached_plans AS cp

CROSS APPLY sys.dm_exec_query_plan(cp.plan_handle) AS qp

CROSS APPLY qp.query_plan.nodes('ShowPlanXML/BatchSequence/Batch/Statements/StmtSimple') AS n(c)

) AS tab

JOIN sys.dm_exec_query_stats AS qs

ON tab.QueryHash = qs.query_hash

CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS st

ORDER BY CompileTime_ms DESC

OPTION(RECOMPILE, MAXDOP 1);

Unused indexes -- updated script

DECLARE @cmd VARCHAR(6000)

DECLARE @TempIndexDrop TABLE (
       [Database_Name] [nvarchar](128) NULL,
       [Object_Name] [nvarchar](128) NULL,
       [Index_Name] [sysname] NULL,
       [Drop_Statement] [nvarchar](283) NULL,
       [user_seeks] [bigint]  NULL,
       [user_scans] [bigint]  NULL,
       [user_lookups] [bigint]  NULL,
       [SpaceSavedMeg] decimal (12,2)  null
) 

SET @cmd = 'USE [?] ;
select db_name(database_id) as ''Database_Name'', object_name(i.object_id) as ''Object_Name'',
i.name as ''Index_Name''
, ''USE ['' + db_name(database_id) + '']; drop index [''  + i.name + ''] on ['' + sch.name + ''].['' + obj.name + '']'' as ''Drop_Statement'',
user_seeks, user_scans, user_lookups,
(select sum(s.used_page_count)*8./1024. from sys.dm_db_partition_stats s where i.object_id = s.object_id and i.index_id = s.index_id)
from sys.dm_db_index_usage_stats ius join sys.indexes i
on ius.index_id = i.index_id and ius.object_id = i.object_id join sys.objects obj
on ius.object_id = obj.object_id join            sys.schemas sch
on            obj.schema_id = sch.schema_id
where      
database_id = db_id(''?'') and
user_seeks + user_scans + user_lookups = 0
and i.name not like ''pk%''
and ''?'' not in (''master'', ''model'',''tempdb'',''msdb'')

order by       object_name(i.object_id),       i.name'

INSERT INTO @TempIndexDrop 
(
[Database_Name]
,[Object_Name]
,[Index_Name] 
,[Drop_Statement] 
,[user_seeks]
,[user_scans]
,[user_lookups]
,[SpaceSavedMeg]
)
Exec sp_msforeachdb @cmd

SELECT SUM(SpaceSavedMeg) as 'Potential Storage Savings' FROM  @TempIndexDrop

SELECT *
FROM @TempIndexDrop
ORDER BY [Database_Name], [Object_Name]

Missing indexes -- revised script

Thanks to Darren Myher (https://DarrenMyher.com) for a few intelligent tweaks as well as some useful formatting for this revised version. 

UPDATED 12/9/24 for SQL Azure

UPDATED 4/23/2025 because people have WEIRD naming conventions

--Use this SQL Script to identify indexes that if added could help improve performance.

--IMPORTANT: Do not BLINDLY implement the script recommendations.  For example, if the SAME TABLE is mentioned multiple times, then

--           it may be better to COMBINE the recommendations of multiple statements into a single one.

--           see later posting on this blog for detail

DECLARE @Edition varchar(50)

SET @Edition = CONVERT(varchar(50), SERVERPROPERTY('Edition'))

DECLARE @bEnterpriseEdition bit

IF LEFT(@Edition, 9) in ('Enterpris', 'Developer', 'SQL Azure')  

SET @bEnterpriseEdition = 1

SELECT

      'CREATE INDEX [IX_'

            + REPLACE(obj.Name, ' ', '') +'_'

            + replace(replace(replace (equality_columns, '[', ''),']',''),', ','_')

            + '] ON '

            + sch.name COLLATE SQL_Latin1_General_CP1_CI_AS + '.' + QuoteName(obj.name)

            + ' ('

            + equality_columns

            + CASE WHEN inequality_columns IS NULL

                   THEN ''

                   ELSE ',' +  inequality_columns

              END

            + ')'

            + CASE WHEN included_columns IS NOT NULL

                   THEN ' INCLUDE (' + ISNULL(included_columns,'') + ') '

                   ELSE ''

              END

            + CASE WHEN @bEnterpriseEdition = 1

                   THEN ' WITH (online = ON)'

                   ELSE ''

              END

            + ' -- ' + CONVERT (varchar, avg_user_impact) + '% anticipated impact'

      FROM sys.dm_db_missing_index_details mid

        JOIN sys.dm_db_missing_index_groups mig

            ON mid.index_handle = mig.index_handle

        JOIN sys.dm_db_missing_index_group_stats migs

            ON migs.group_handle = mig.index_group_handle

        JOIN sys.objects obj

            ON obj.object_id = mid.object_id

        JOIN sys.schemas sch

            ON obj.schema_id = sch.schema_id

      WHERE

        database_id = db_id()

        AND avg_user_impact > 60

        AND equality_columns IS NOT NULL

      ORDER BY

        obj.name

        , equality_columns

        , inequality_columns

        , datalength(included_columns)

What's going on right now?

Got the following code from the site I'm at today, I'll be using it for a while. The first chunk of code grabs current query plans; the second chunk looks at how memory is being used. Enjoy.

EXEC dbo.sp_WhoIsActive

@filter = '', -- varchar(128)

@filter_type = 'session', -- varchar(10)

@not_filter = '', -- varchar(128)

@not_filter_type = 'session', -- varchar(10)

@show_own_spid = 1, -- bit

@show_sleeping_spids = 0, -- tinyint

@get_full_inner_text = 1, -- bit

@get_plans = 1, -- tinyint

@get_outer_command = 1, -- bit

@get_task_info = 0, -- tinyint

@get_locks = 0, -- bit

@get_avg_time = 0, -- bit

@find_block_leaders = 1 -- bit

SELECT OBJECT_NAME(p.[object_id]) AS [ObjectName],

p.index_id, COUNT(*)/128 AS [Buffer size(MB)],  COUNT(*) AS [BufferCount],

p.data_compression_desc AS [CompressionType], a.type_desc, p.[rows]

FROM sys.allocation_units AS a WITH (NOLOCK)

INNER JOIN sys.dm_os_buffer_descriptors AS b WITH (NOLOCK)

ON a.allocation_unit_id = b.allocation_unit_id

INNER JOIN sys.partitions AS p WITH (NOLOCK)

ON a.container_id = p.partition_id

WHERE b.database_id = CONVERT(int,DB_ID())

AND p.[object_id] > 100

GROUP BY p.[object_id], p.index_id, p.data_compression_desc, a.type_desc, p.[rows]

ORDER BY [BufferCount] DESC OPTION (RECOMPILE);

Fixing VLF issues for all databases on a server

/*Note: This script presumes that databases are in SIMPLE recovery mode (as it was at this client site at the time). It reduces log file size to minimum, then increases it to what it was before it was shrunk, in one big alter. At the same time, it changes autogrowth to 10% across the board.*/

DECLARE @cmd VARCHAR(6000)

SET @cmd = 'USE [?] ;

declare @filename varchar(1000), @dbcc varchar(2000), @alter varchar(1000), @size int

select @filename = name, @size = (size+127)/128 from sys.sysfiles where filename like ''%ldf''

print db_name()

print @filename

set @dbcc = ''dbcc shrinkfile (xx, 2)''

set @dbcc = REPLACE(@dbcc, ''xx'' ,@filename)

set @alter = ''ALTER DATABASE ['' + db_name() +

''] MODIFY FILE ( NAME = xx, SIZE = '' + convert(varchar, @size ) + ''MB, FILEGROWTH = 10%)''

set @alter = REPLACE(@alter, ''xx'' ,@filename)

print @dbcc

print @alter

exec (@dbcc)

exec (@alter)

'

Exec sp_msforeachdb @cmd

How big are the tables in my databases?

I stole (and slightly modified) this code, and put it here so that I could find it. Have fun.

SELECT
t.NAME AS TableName,
s.Name AS SchemaName,
sum(p.rows) AS RowCounts,
SUM(a.total_pages) * 8 AS TotalSpaceKB,
SUM(a.used_pages) * 8 AS UsedSpaceKB,
(SUM(a.total_pages) - SUM(a.used_pages)) * 8 AS UnusedSpaceKB
FROM
sys.tables t
INNER JOIN
sys.indexes i ON t.OBJECT_ID = i.object_id
INNER JOIN
sys.partitions p ON i.object_id = p.OBJECT_ID AND i.index_id = p.index_id
INNER JOIN
sys.allocation_units a ON p.partition_id = a.container_id
LEFT OUTER JOIN
sys.schemas s ON t.schema_id = s.schema_id
WHERE
t.NAME NOT LIKE 'dt%'
AND t.is_ms_shipped = 0
AND i.OBJECT_ID > 255
GROUP BY
t.Name, s.Name 
ORDER BY
TotalSpaceKB desc



-- t.Name