Suggestion on Missing Index Creation The Next CEO of Stack OverflowHow does SQL Server determine key column order in missing index requests?SQL Server: index creation dateDynamic temporary index creationParent-Child Tree Hierarchical ORDERAdding index to large mysql tablesFirebird Index Creation FailsMySQL Index Creation Internalsdeteriorating stored procedure running timesClustered Index Creationsp_BlitzIndex finding “Unknown” indexClustered index scan appears to be costed too low with row count spool
Is it okay to majorly distort historical facts while writing a fiction story?
Compensation for working overtime on Saturdays
Is there a rule of thumb for determining the amount one should accept for a settlement offer?
Can a PhD from a non-TU9 German university become a professor in a TU9 university?
Shortening a title without changing its meaning
pgfplots: How to draw a tangent graph below two others?
Why can't we say "I have been having a dog"?
Upgrading From a 9 Speed Sora Derailleur?
Arity of Primitive Recursive Functions
How to compactly explain secondary and tertiary characters without resorting to stereotypes?
Read/write a pipe-delimited file line by line with some simple text manipulation
How can I separate the number from the unit in argument?
Can I cast Thunderwave and be at the center of its bottom face, but not be affected by it?
How can a day be of 24 hours?
MT "will strike" & LXX "will watch carefully" (Gen 3:15)?
Calculating discount not working
Ising model simulation
What did the word "leisure" mean in late 18th Century usage?
Is it a bad idea to plug the other end of ESD strap to wall ground?
Arrows in tikz Markov chain diagram overlap
A hang glider, sudden unexpected lift to 25,000 feet altitude, what could do this?
Is the offspring between a demon and a celestial possible? If so what is it called and is it in a book somewhere?
Why did the Drakh emissary look so blurred in S04:E11 "Lines of Communication"?
Traveling with my 5 year old daughter (as the father) without the mother from Germany to Mexico
Suggestion on Missing Index Creation
The Next CEO of Stack OverflowHow does SQL Server determine key column order in missing index requests?SQL Server: index creation dateDynamic temporary index creationParent-Child Tree Hierarchical ORDERAdding index to large mysql tablesFirebird Index Creation FailsMySQL Index Creation Internalsdeteriorating stored procedure running timesClustered Index Creationsp_BlitzIndex finding “Unknown” indexClustered index scan appears to be costed too low with row count spool
1
I have been using sp_blitzindex and it is very very helpful(Thanks to Brent Ozar and Team). I executed this procedure against my database and below is the finding for one table falling in Indexaphobia group:
below is definition of underlying table:
CREATE TABLE [dbo].[table_name](
[L] [int] IDENTITY(1,1) NOT NULL,
[R] [varchar](15) NOT NULL,
[A] [int] NOT NULL,
[VAR32_01] [varchar](32) NULL,
[VAR32_02] [varchar](32) NULL,
[VAR32_03] [varchar](32) NULL,
[VAR32_04] [varchar](32) NULL,
[VAR32_05] [varchar](32) NULL,
[VAR32_06] [varchar](32) NULL,
[VAR32_07] [varchar](32) NULL,
[VAR32_08] [varchar](32) NULL,
[VAR32_09] [varchar](32) NULL,
[VAR32_10] [varchar](32) NULL,
[VAR32_11] [varchar](32) NULL,
[VAR32_12] [varchar](32) NULL,
[VAR32_13] [varchar](32) NULL,
[VAR32_14] [varchar](32) NULL,
[VAR32_15] [varchar](32) NULL,
[VAR32_16] [varchar](32) NULL,
[VAR32_17] [varchar](32) NULL,
[VAR32_18] [varchar](32) NULL,
[VAR32_19] [varchar](32) NULL,
[VAR32_20] [varchar](32) NULL,
[VAR32_21] [varchar](32) NULL,
[VAR32_22] [varchar](32) NULL,
[VAR32_23] [varchar](32) NULL,
[VAR32_24] [varchar](32) NULL,
[VAR32_25] [varchar](32) NULL,
[VAR32_26] [varchar](32) NULL,
[VAR32_27] [varchar](32) NULL,
[VAR32_28] [varchar](32) NULL,
[VAR32_29] [varchar](32) NULL,
[VAR32_30] [varchar](32) NULL,
[VAR32_31] [varchar](32) NULL,
[VAR32_32] [varchar](32) NULL,
[VAR32_33] [varchar](32) NULL,
[VAR32_34] [varchar](32) NULL,
[VAR32_35] [varchar](32) NULL,
[VAR32_36] [varchar](32) NULL,
[VAR32_37] [varchar](32) NULL,
[VAR32_38] [varchar](32) NULL,
[VAR32_39] [varchar](32) NULL,
[VAR32_40] [varchar](32) NULL,
[VAR32_41] [varchar](32) NULL,
[VAR32_42] [varchar](32) NULL,
[VAR32_43] [varchar](32) NULL,
[VAR32_44] [varchar](32) NULL,
[VAR32_45] [varchar](32) NULL,
[VAR32_46] [varchar](32) NULL,
[VAR32_47] [varchar](32) NULL,
[VAR32_48] [varchar](32) NULL,
[VAR32_49] [varchar](32) NULL,
[VAR32_50] [varchar](32) NULL,
[VAR32_51] [varchar](32) NULL,
[VAR32_52] [varchar](32) NULL,
[VAR32_53] [varchar](32) NULL,
[VAR32_54] [varchar](32) NULL,
[VAR32_55] [varchar](32) NULL,
[VAR32_56] [varchar](32) NULL,
[VAR32_57] [varchar](32) NULL,
[VAR32_58] [varchar](32) NULL,
[VAR32_59] [varchar](32) NULL,
[VAR32_60] [varchar](32) NULL,
[VAR32_61] [varchar](32) NULL,
[VAR32_62] [varchar](32) NULL,
[VAR32_63] [varchar](32) NULL,
[VAR32_64] [varchar](32) NULL,
[VAR64_01] [varchar](64) NULL,
[VAR64_02] [varchar](64) NULL,
[VAR64_03] [varchar](64) NULL,
[VAR64_04] [varchar](64) NULL,
[VAR64_05] [varchar](64) NULL,
[VAR64_06] [varchar](64) NULL,
[VAR64_07] [varchar](64) NULL,
[VAR64_08] [varchar](64) NULL,
[VAR64_09] [varchar](64) NULL,
[VAR64_10] [varchar](64) NULL,
[VAR64_11] [varchar](64) NULL,
[VAR64_12] [varchar](64) NULL,
[VAR64_13] [varchar](64) NULL,
[VAR64_14] [varchar](64) NULL,
[VAR64_15] [varchar](64) NULL,
[VAR64_16] [varchar](64) NULL,
[VAR64_17] [varchar](64) NULL,
[VAR64_18] [varchar](64) NULL,
[VAR64_19] [varchar](64) NULL,
[VAR64_20] [varchar](64) NULL,
[VAR64_21] [varchar](64) NULL,
[VAR64_22] [varchar](64) NULL,
[VAR64_23] [varchar](64) NULL,
[VAR64_24] [varchar](64) NULL,
[VAR64_25] [varchar](64) NULL,
[VAR64_26] [varchar](64) NULL,
[VAR64_27] [varchar](64) NULL,
[VAR64_28] [varchar](64) NULL,
[VAR64_29] [varchar](64) NULL,
[VAR64_30] [varchar](64) NULL,
[VAR64_31] [varchar](64) NULL,
[VAR64_32] [varchar](64) NULL,
[VAR128_01] [varchar](128) NULL,
[VAR128_02] [varchar](128) NULL,
[VAR128_03] [varchar](128) NULL,
[VAR128_04] [varchar](128) NULL,
[VAR128_05] [varchar](128) NULL,
[VAR128_06] [varchar](128) NULL,
[VAR128_07] [varchar](128) NULL,
[VAR128_08] [varchar](128) NULL,
[VAR128_09] [varchar](128) NULL,
[VAR128_10] [varchar](128) NULL,
[VAR128_11] [varchar](128) NULL,
[VAR128_12] [varchar](128) NULL,
[VAR128_13] [varchar](128) NULL,
[VAR128_14] [varchar](128) NULL,
[VAR128_15] [varchar](128) NULL,
[VAR128_16] [varchar](128) NULL,
[VAR256_01] [varchar](256) NULL,
[VAR256_02] [varchar](256) NULL,
[VAR256_03] [varchar](256) NULL,
[VAR256_04] [varchar](256) NULL,
[VAR256_05] [varchar](256) NULL,
[VAR256_06] [varchar](256) NULL,
[VAR256_07] [varchar](256) NULL,
[VAR256_08] [varchar](256) NULL,
[VAR512_01] [varchar](512) NULL,
[VAR512_02] [varchar](512) NULL,
[VAR512_03] [varchar](512) NULL,
[VAR512_04] [varchar](512) NULL,
[VAR1024_01] [varchar](1024) NULL,
[VAR1024_02] [varchar](1024) NULL,
[E] [varchar](20) NULL,
[M] [varchar](40) NULL,
[E] [varchar](50) NULL,
[N] [varchar](40) NULL,
[TN] [int] NULL,
[T] [numeric](1, 0) NULL,
[D] [numeric](1, 0) NULL,
CONSTRAINT [XPKtable_name] PRIMARY KEY NONCLUSTERED
(
[L] ASC,
[R] ASC
)
Following these missing index details, I am planning to create index with below definition:
create nonclustered index table_name_incl(A,VAR32_02) include(L,R,E,T,D,VAR32_10,VAR32_18,VAR32_19,VAR32_20,VAR64_11,VAR64_02,VAR32_42,VAR32_39,VAR32_38,VAR32_35,VAR32_39,VAR32_24,VAR32_25,VAR32_27)
I have arrived at above columns based on the number of occurrences of these columns in all 6 missing index stats.
As you can see from table definition, this is a heap and doesn't have clustered index on this table.
Appreciate your guidance or any assistance on this.
Version: Microsoft SQL Server 2014 (SP3) (KB4022619) - 12.0.6024.0 (X64) Sep 7 2018 01:37:51 Enterprise Edition: Core-based Licensing (64-bit) on Windows NT 6.3 (Build 9600: ) (Hypervisor)
sql-server index sp-blitzindex
asked Mar 25 at 12:53
Learning_DBAdminLearning_DBAdmin
416214
|
show 4 more comments
1
I have been using sp_blitzindex and it is very very helpful(Thanks to Brent Ozar and Team). I executed this procedure against my database and below is the finding for one table falling in Indexaphobia group:
below is definition of underlying table:
CREATE TABLE [dbo].[table_name](
[L] [int] IDENTITY(1,1) NOT NULL,
[R] [varchar](15) NOT NULL,
[A] [int] NOT NULL,
[VAR32_01] [varchar](32) NULL,
[VAR32_02] [varchar](32) NULL,
[VAR32_03] [varchar](32) NULL,
[VAR32_04] [varchar](32) NULL,
[VAR32_05] [varchar](32) NULL,
[VAR32_06] [varchar](32) NULL,
[VAR32_07] [varchar](32) NULL,
[VAR32_08] [varchar](32) NULL,
[VAR32_09] [varchar](32) NULL,
[VAR32_10] [varchar](32) NULL,
[VAR32_11] [varchar](32) NULL,
[VAR32_12] [varchar](32) NULL,
[VAR32_13] [varchar](32) NULL,
[VAR32_14] [varchar](32) NULL,
[VAR32_15] [varchar](32) NULL,
[VAR32_16] [varchar](32) NULL,
[VAR32_17] [varchar](32) NULL,
[VAR32_18] [varchar](32) NULL,
[VAR32_19] [varchar](32) NULL,
[VAR32_20] [varchar](32) NULL,
[VAR32_21] [varchar](32) NULL,
[VAR32_22] [varchar](32) NULL,
[VAR32_23] [varchar](32) NULL,
[VAR32_24] [varchar](32) NULL,
[VAR32_25] [varchar](32) NULL,
[VAR32_26] [varchar](32) NULL,
[VAR32_27] [varchar](32) NULL,
[VAR32_28] [varchar](32) NULL,
[VAR32_29] [varchar](32) NULL,
[VAR32_30] [varchar](32) NULL,
[VAR32_31] [varchar](32) NULL,
[VAR32_32] [varchar](32) NULL,
[VAR32_33] [varchar](32) NULL,
[VAR32_34] [varchar](32) NULL,
[VAR32_35] [varchar](32) NULL,
[VAR32_36] [varchar](32) NULL,
[VAR32_37] [varchar](32) NULL,
[VAR32_38] [varchar](32) NULL,
[VAR32_39] [varchar](32) NULL,
[VAR32_40] [varchar](32) NULL,
[VAR32_41] [varchar](32) NULL,
[VAR32_42] [varchar](32) NULL,
[VAR32_43] [varchar](32) NULL,
[VAR32_44] [varchar](32) NULL,
[VAR32_45] [varchar](32) NULL,
[VAR32_46] [varchar](32) NULL,
[VAR32_47] [varchar](32) NULL,
[VAR32_48] [varchar](32) NULL,
[VAR32_49] [varchar](32) NULL,
[VAR32_50] [varchar](32) NULL,
[VAR32_51] [varchar](32) NULL,
[VAR32_52] [varchar](32) NULL,
[VAR32_53] [varchar](32) NULL,
[VAR32_54] [varchar](32) NULL,
[VAR32_55] [varchar](32) NULL,
[VAR32_56] [varchar](32) NULL,
[VAR32_57] [varchar](32) NULL,
[VAR32_58] [varchar](32) NULL,
[VAR32_59] [varchar](32) NULL,
[VAR32_60] [varchar](32) NULL,
[VAR32_61] [varchar](32) NULL,
[VAR32_62] [varchar](32) NULL,
[VAR32_63] [varchar](32) NULL,
[VAR32_64] [varchar](32) NULL,
[VAR64_01] [varchar](64) NULL,
[VAR64_02] [varchar](64) NULL,
[VAR64_03] [varchar](64) NULL,
[VAR64_04] [varchar](64) NULL,
[VAR64_05] [varchar](64) NULL,
[VAR64_06] [varchar](64) NULL,
[VAR64_07] [varchar](64) NULL,
[VAR64_08] [varchar](64) NULL,
[VAR64_09] [varchar](64) NULL,
[VAR64_10] [varchar](64) NULL,
[VAR64_11] [varchar](64) NULL,
[VAR64_12] [varchar](64) NULL,
[VAR64_13] [varchar](64) NULL,
[VAR64_14] [varchar](64) NULL,
[VAR64_15] [varchar](64) NULL,
[VAR64_16] [varchar](64) NULL,
[VAR64_17] [varchar](64) NULL,
[VAR64_18] [varchar](64) NULL,
[VAR64_19] [varchar](64) NULL,
[VAR64_20] [varchar](64) NULL,
[VAR64_21] [varchar](64) NULL,
[VAR64_22] [varchar](64) NULL,
[VAR64_23] [varchar](64) NULL,
[VAR64_24] [varchar](64) NULL,
[VAR64_25] [varchar](64) NULL,
[VAR64_26] [varchar](64) NULL,
[VAR64_27] [varchar](64) NULL,
[VAR64_28] [varchar](64) NULL,
[VAR64_29] [varchar](64) NULL,
[VAR64_30] [varchar](64) NULL,
[VAR64_31] [varchar](64) NULL,
[VAR64_32] [varchar](64) NULL,
[VAR128_01] [varchar](128) NULL,
[VAR128_02] [varchar](128) NULL,
[VAR128_03] [varchar](128) NULL,
[VAR128_04] [varchar](128) NULL,
[VAR128_05] [varchar](128) NULL,
[VAR128_06] [varchar](128) NULL,
[VAR128_07] [varchar](128) NULL,
[VAR128_08] [varchar](128) NULL,
[VAR128_09] [varchar](128) NULL,
[VAR128_10] [varchar](128) NULL,
[VAR128_11] [varchar](128) NULL,
[VAR128_12] [varchar](128) NULL,
[VAR128_13] [varchar](128) NULL,
[VAR128_14] [varchar](128) NULL,
[VAR128_15] [varchar](128) NULL,
[VAR128_16] [varchar](128) NULL,
[VAR256_01] [varchar](256) NULL,
[VAR256_02] [varchar](256) NULL,
[VAR256_03] [varchar](256) NULL,
[VAR256_04] [varchar](256) NULL,
[VAR256_05] [varchar](256) NULL,
[VAR256_06] [varchar](256) NULL,
[VAR256_07] [varchar](256) NULL,
[VAR256_08] [varchar](256) NULL,
[VAR512_01] [varchar](512) NULL,
[VAR512_02] [varchar](512) NULL,
[VAR512_03] [varchar](512) NULL,
[VAR512_04] [varchar](512) NULL,
[VAR1024_01] [varchar](1024) NULL,
[VAR1024_02] [varchar](1024) NULL,
[E] [varchar](20) NULL,
[M] [varchar](40) NULL,
[E] [varchar](50) NULL,
[N] [varchar](40) NULL,
[TN] [int] NULL,
[T] [numeric](1, 0) NULL,
[D] [numeric](1, 0) NULL,
CONSTRAINT [XPKtable_name] PRIMARY KEY NONCLUSTERED
(
[L] ASC,
[R] ASC
)
Following these missing index details, I am planning to create index with below definition:
create nonclustered index table_name_incl(A,VAR32_02) include(L,R,E,T,D,VAR32_10,VAR32_18,VAR32_19,VAR32_20,VAR64_11,VAR64_02,VAR32_42,VAR32_39,VAR32_38,VAR32_35,VAR32_39,VAR32_24,VAR32_25,VAR32_27)
I have arrived at above columns based on the number of occurrences of these columns in all 6 missing index stats.
As you can see from table definition, this is a heap and doesn't have clustered index on this table.
Appreciate your guidance or any assistance on this.
Version: Microsoft SQL Server 2014 (SP3) (KB4022619) - 12.0.6024.0 (X64) Sep 7 2018 01:37:51 Enterprise Edition: Core-based Licensing (64-bit) on Windows NT 6.3 (Build 9600: ) (Hypervisor)
sql-server index sp-blitzindex
asked Mar 25 at 12:53
Learning_DBAdminLearning_DBAdmin
416214
1
Silly question: why not create a clustered index? it looks like if you created one onA, it would solve a few different problems? Is the identity column a nonclustered primary key?
– Erik Darling
Mar 25 at 13:04
@ErikDarling Trying to learn from many experts in the forum. Apologies for silly question.I wish, I could have been in the position to create clustered index. Since, its a vendor supported code, don't have much room for change. Yes, primary key is created as non-clustered column.
– Learning_DBAdmin
Mar 25 at 13:53
I didn't mean your question was silly, I meant mine was. I understand the pain of supporting a vendor database. But to get things right, you can create nonclustered indexes, but not clustered indexes?
– Erik Darling
Mar 25 at 13:57
@ErikDarling Clustered index poses many constraints like null, duplicates etc whereas non-clustered doesn't pose any risk for vendor and they agree on it easily. I have tried many times for clustered index creation however have faced so much resistance from them.I will try once again with them to create clustered index on A column, I would also see if we can have clustered index on L & A; this would be safer for them(I guess).
– Learning_DBAdmin
Mar 25 at 14:01
1
No, clustered indexes don't do that. See my demo here.
– Erik Darling
Mar 25 at 14:35
|
show 4 more comments
1
1
1
I have been using sp_blitzindex and it is very very helpful(Thanks to Brent Ozar and Team). I executed this procedure against my database and below is the finding for one table falling in Indexaphobia group:
below is definition of underlying table:
CREATE TABLE [dbo].[table_name](
[L] [int] IDENTITY(1,1) NOT NULL,
[R] [varchar](15) NOT NULL,
[A] [int] NOT NULL,
[VAR32_01] [varchar](32) NULL,
[VAR32_02] [varchar](32) NULL,
[VAR32_03] [varchar](32) NULL,
[VAR32_04] [varchar](32) NULL,
[VAR32_05] [varchar](32) NULL,
[VAR32_06] [varchar](32) NULL,
[VAR32_07] [varchar](32) NULL,
[VAR32_08] [varchar](32) NULL,
[VAR32_09] [varchar](32) NULL,
[VAR32_10] [varchar](32) NULL,
[VAR32_11] [varchar](32) NULL,
[VAR32_12] [varchar](32) NULL,
[VAR32_13] [varchar](32) NULL,
[VAR32_14] [varchar](32) NULL,
[VAR32_15] [varchar](32) NULL,
[VAR32_16] [varchar](32) NULL,
[VAR32_17] [varchar](32) NULL,
[VAR32_18] [varchar](32) NULL,
[VAR32_19] [varchar](32) NULL,
[VAR32_20] [varchar](32) NULL,
[VAR32_21] [varchar](32) NULL,
[VAR32_22] [varchar](32) NULL,
[VAR32_23] [varchar](32) NULL,
[VAR32_24] [varchar](32) NULL,
[VAR32_25] [varchar](32) NULL,
[VAR32_26] [varchar](32) NULL,
[VAR32_27] [varchar](32) NULL,
[VAR32_28] [varchar](32) NULL,
[VAR32_29] [varchar](32) NULL,
[VAR32_30] [varchar](32) NULL,
[VAR32_31] [varchar](32) NULL,
[VAR32_32] [varchar](32) NULL,
[VAR32_33] [varchar](32) NULL,
[VAR32_34] [varchar](32) NULL,
[VAR32_35] [varchar](32) NULL,
[VAR32_36] [varchar](32) NULL,
[VAR32_37] [varchar](32) NULL,
[VAR32_38] [varchar](32) NULL,
[VAR32_39] [varchar](32) NULL,
[VAR32_40] [varchar](32) NULL,
[VAR32_41] [varchar](32) NULL,
[VAR32_42] [varchar](32) NULL,
[VAR32_43] [varchar](32) NULL,
[VAR32_44] [varchar](32) NULL,
[VAR32_45] [varchar](32) NULL,
[VAR32_46] [varchar](32) NULL,
[VAR32_47] [varchar](32) NULL,
[VAR32_48] [varchar](32) NULL,
[VAR32_49] [varchar](32) NULL,
[VAR32_50] [varchar](32) NULL,
[VAR32_51] [varchar](32) NULL,
[VAR32_52] [varchar](32) NULL,
[VAR32_53] [varchar](32) NULL,
[VAR32_54] [varchar](32) NULL,
[VAR32_55] [varchar](32) NULL,
[VAR32_56] [varchar](32) NULL,
[VAR32_57] [varchar](32) NULL,
[VAR32_58] [varchar](32) NULL,
[VAR32_59] [varchar](32) NULL,
[VAR32_60] [varchar](32) NULL,
[VAR32_61] [varchar](32) NULL,
[VAR32_62] [varchar](32) NULL,
[VAR32_63] [varchar](32) NULL,
[VAR32_64] [varchar](32) NULL,
[VAR64_01] [varchar](64) NULL,
[VAR64_02] [varchar](64) NULL,
[VAR64_03] [varchar](64) NULL,
[VAR64_04] [varchar](64) NULL,
[VAR64_05] [varchar](64) NULL,
[VAR64_06] [varchar](64) NULL,
[VAR64_07] [varchar](64) NULL,
[VAR64_08] [varchar](64) NULL,
[VAR64_09] [varchar](64) NULL,
[VAR64_10] [varchar](64) NULL,
[VAR64_11] [varchar](64) NULL,
[VAR64_12] [varchar](64) NULL,
[VAR64_13] [varchar](64) NULL,
[VAR64_14] [varchar](64) NULL,
[VAR64_15] [varchar](64) NULL,
[VAR64_16] [varchar](64) NULL,
[VAR64_17] [varchar](64) NULL,
[VAR64_18] [varchar](64) NULL,
[VAR64_19] [varchar](64) NULL,
[VAR64_20] [varchar](64) NULL,
[VAR64_21] [varchar](64) NULL,
[VAR64_22] [varchar](64) NULL,
[VAR64_23] [varchar](64) NULL,
[VAR64_24] [varchar](64) NULL,
[VAR64_25] [varchar](64) NULL,
[VAR64_26] [varchar](64) NULL,
[VAR64_27] [varchar](64) NULL,
[VAR64_28] [varchar](64) NULL,
[VAR64_29] [varchar](64) NULL,
[VAR64_30] [varchar](64) NULL,
[VAR64_31] [varchar](64) NULL,
[VAR64_32] [varchar](64) NULL,
[VAR128_01] [varchar](128) NULL,
[VAR128_02] [varchar](128) NULL,
[VAR128_03] [varchar](128) NULL,
[VAR128_04] [varchar](128) NULL,
[VAR128_05] [varchar](128) NULL,
[VAR128_06] [varchar](128) NULL,
[VAR128_07] [varchar](128) NULL,
[VAR128_08] [varchar](128) NULL,
[VAR128_09] [varchar](128) NULL,
[VAR128_10] [varchar](128) NULL,
[VAR128_11] [varchar](128) NULL,
[VAR128_12] [varchar](128) NULL,
[VAR128_13] [varchar](128) NULL,
[VAR128_14] [varchar](128) NULL,
[VAR128_15] [varchar](128) NULL,
[VAR128_16] [varchar](128) NULL,
[VAR256_01] [varchar](256) NULL,
[VAR256_02] [varchar](256) NULL,
[VAR256_03] [varchar](256) NULL,
[VAR256_04] [varchar](256) NULL,
[VAR256_05] [varchar](256) NULL,
[VAR256_06] [varchar](256) NULL,
[VAR256_07] [varchar](256) NULL,
[VAR256_08] [varchar](256) NULL,
[VAR512_01] [varchar](512) NULL,
[VAR512_02] [varchar](512) NULL,
[VAR512_03] [varchar](512) NULL,
[VAR512_04] [varchar](512) NULL,
[VAR1024_01] [varchar](1024) NULL,
[VAR1024_02] [varchar](1024) NULL,
[E] [varchar](20) NULL,
[M] [varchar](40) NULL,
[E] [varchar](50) NULL,
[N] [varchar](40) NULL,
[TN] [int] NULL,
[T] [numeric](1, 0) NULL,
[D] [numeric](1, 0) NULL,
CONSTRAINT [XPKtable_name] PRIMARY KEY NONCLUSTERED
(
[L] ASC,
[R] ASC
)
Following these missing index details, I am planning to create index with below definition:
create nonclustered index table_name_incl(A,VAR32_02) include(L,R,E,T,D,VAR32_10,VAR32_18,VAR32_19,VAR32_20,VAR64_11,VAR64_02,VAR32_42,VAR32_39,VAR32_38,VAR32_35,VAR32_39,VAR32_24,VAR32_25,VAR32_27)
I have arrived at above columns based on the number of occurrences of these columns in all 6 missing index stats.
As you can see from table definition, this is a heap and doesn't have clustered index on this table.
Appreciate your guidance or any assistance on this.
Version: Microsoft SQL Server 2014 (SP3) (KB4022619) - 12.0.6024.0 (X64) Sep 7 2018 01:37:51 Enterprise Edition: Core-based Licensing (64-bit) on Windows NT 6.3 (Build 9600: ) (Hypervisor)
sql-server index sp-blitzindex
asked Mar 25 at 12:53
Learning_DBAdminLearning_DBAdmin
416214
I have been using sp_blitzindex and it is very very helpful(Thanks to Brent Ozar and Team). I executed this procedure against my database and below is the finding for one table falling in Indexaphobia group:
below is definition of underlying table:
CREATE TABLE [dbo].[table_name](
[L] [int] IDENTITY(1,1) NOT NULL,
[R] [varchar](15) NOT NULL,
[A] [int] NOT NULL,
[VAR32_01] [varchar](32) NULL,
[VAR32_02] [varchar](32) NULL,
[VAR32_03] [varchar](32) NULL,
[VAR32_04] [varchar](32) NULL,
[VAR32_05] [varchar](32) NULL,
[VAR32_06] [varchar](32) NULL,
[VAR32_07] [varchar](32) NULL,
[VAR32_08] [varchar](32) NULL,
[VAR32_09] [varchar](32) NULL,
[VAR32_10] [varchar](32) NULL,
[VAR32_11] [varchar](32) NULL,
[VAR32_12] [varchar](32) NULL,
[VAR32_13] [varchar](32) NULL,
[VAR32_14] [varchar](32) NULL,
[VAR32_15] [varchar](32) NULL,
[VAR32_16] [varchar](32) NULL,
[VAR32_17] [varchar](32) NULL,
[VAR32_18] [varchar](32) NULL,
[VAR32_19] [varchar](32) NULL,
[VAR32_20] [varchar](32) NULL,
[VAR32_21] [varchar](32) NULL,
[VAR32_22] [varchar](32) NULL,
[VAR32_23] [varchar](32) NULL,
[VAR32_24] [varchar](32) NULL,
[VAR32_25] [varchar](32) NULL,
[VAR32_26] [varchar](32) NULL,
[VAR32_27] [varchar](32) NULL,
[VAR32_28] [varchar](32) NULL,
[VAR32_29] [varchar](32) NULL,
[VAR32_30] [varchar](32) NULL,
[VAR32_31] [varchar](32) NULL,
[VAR32_32] [varchar](32) NULL,
[VAR32_33] [varchar](32) NULL,
[VAR32_34] [varchar](32) NULL,
[VAR32_35] [varchar](32) NULL,
[VAR32_36] [varchar](32) NULL,
[VAR32_37] [varchar](32) NULL,
[VAR32_38] [varchar](32) NULL,
[VAR32_39] [varchar](32) NULL,
[VAR32_40] [varchar](32) NULL,
[VAR32_41] [varchar](32) NULL,
[VAR32_42] [varchar](32) NULL,
[VAR32_43] [varchar](32) NULL,
[VAR32_44] [varchar](32) NULL,
[VAR32_45] [varchar](32) NULL,
[VAR32_46] [varchar](32) NULL,
[VAR32_47] [varchar](32) NULL,
[VAR32_48] [varchar](32) NULL,
[VAR32_49] [varchar](32) NULL,
[VAR32_50] [varchar](32) NULL,
[VAR32_51] [varchar](32) NULL,
[VAR32_52] [varchar](32) NULL,
[VAR32_53] [varchar](32) NULL,
[VAR32_54] [varchar](32) NULL,
[VAR32_55] [varchar](32) NULL,
[VAR32_56] [varchar](32) NULL,
[VAR32_57] [varchar](32) NULL,
[VAR32_58] [varchar](32) NULL,
[VAR32_59] [varchar](32) NULL,
[VAR32_60] [varchar](32) NULL,
[VAR32_61] [varchar](32) NULL,
[VAR32_62] [varchar](32) NULL,
[VAR32_63] [varchar](32) NULL,
[VAR32_64] [varchar](32) NULL,
[VAR64_01] [varchar](64) NULL,
[VAR64_02] [varchar](64) NULL,
[VAR64_03] [varchar](64) NULL,
[VAR64_04] [varchar](64) NULL,
[VAR64_05] [varchar](64) NULL,
[VAR64_06] [varchar](64) NULL,
[VAR64_07] [varchar](64) NULL,
[VAR64_08] [varchar](64) NULL,
[VAR64_09] [varchar](64) NULL,
[VAR64_10] [varchar](64) NULL,
[VAR64_11] [varchar](64) NULL,
[VAR64_12] [varchar](64) NULL,
[VAR64_13] [varchar](64) NULL,
[VAR64_14] [varchar](64) NULL,
[VAR64_15] [varchar](64) NULL,
[VAR64_16] [varchar](64) NULL,
[VAR64_17] [varchar](64) NULL,
[VAR64_18] [varchar](64) NULL,
[VAR64_19] [varchar](64) NULL,
[VAR64_20] [varchar](64) NULL,
[VAR64_21] [varchar](64) NULL,
[VAR64_22] [varchar](64) NULL,
[VAR64_23] [varchar](64) NULL,
[VAR64_24] [varchar](64) NULL,
[VAR64_25] [varchar](64) NULL,
[VAR64_26] [varchar](64) NULL,
[VAR64_27] [varchar](64) NULL,
[VAR64_28] [varchar](64) NULL,
[VAR64_29] [varchar](64) NULL,
[VAR64_30] [varchar](64) NULL,
[VAR64_31] [varchar](64) NULL,
[VAR64_32] [varchar](64) NULL,
[VAR128_01] [varchar](128) NULL,
[VAR128_02] [varchar](128) NULL,
[VAR128_03] [varchar](128) NULL,
[VAR128_04] [varchar](128) NULL,
[VAR128_05] [varchar](128) NULL,
[VAR128_06] [varchar](128) NULL,
[VAR128_07] [varchar](128) NULL,
[VAR128_08] [varchar](128) NULL,
[VAR128_09] [varchar](128) NULL,
[VAR128_10] [varchar](128) NULL,
[VAR128_11] [varchar](128) NULL,
[VAR128_12] [varchar](128) NULL,
[VAR128_13] [varchar](128) NULL,
[VAR128_14] [varchar](128) NULL,
[VAR128_15] [varchar](128) NULL,
[VAR128_16] [varchar](128) NULL,
[VAR256_01] [varchar](256) NULL,
[VAR256_02] [varchar](256) NULL,
[VAR256_03] [varchar](256) NULL,
[VAR256_04] [varchar](256) NULL,
[VAR256_05] [varchar](256) NULL,
[VAR256_06] [varchar](256) NULL,
[VAR256_07] [varchar](256) NULL,
[VAR256_08] [varchar](256) NULL,
[VAR512_01] [varchar](512) NULL,
[VAR512_02] [varchar](512) NULL,
[VAR512_03] [varchar](512) NULL,
[VAR512_04] [varchar](512) NULL,
[VAR1024_01] [varchar](1024) NULL,
[VAR1024_02] [varchar](1024) NULL,
[E] [varchar](20) NULL,
[M] [varchar](40) NULL,
[E] [varchar](50) NULL,
[N] [varchar](40) NULL,
[TN] [int] NULL,
[T] [numeric](1, 0) NULL,
[D] [numeric](1, 0) NULL,
CONSTRAINT [XPKtable_name] PRIMARY KEY NONCLUSTERED
(
[L] ASC,
[R] ASC
)
Following these missing index details, I am planning to create index with below definition:
create nonclustered index table_name_incl(A,VAR32_02) include(L,R,E,T,D,VAR32_10,VAR32_18,VAR32_19,VAR32_20,VAR64_11,VAR64_02,VAR32_42,VAR32_39,VAR32_38,VAR32_35,VAR32_39,VAR32_24,VAR32_25,VAR32_27)
I have arrived at above columns based on the number of occurrences of these columns in all 6 missing index stats.
As you can see from table definition, this is a heap and doesn't have clustered index on this table.
Appreciate your guidance or any assistance on this.
Version: Microsoft SQL Server 2014 (SP3) (KB4022619) - 12.0.6024.0 (X64) Sep 7 2018 01:37:51 Enterprise Edition: Core-based Licensing (64-bit) on Windows NT 6.3 (Build 9600: ) (Hypervisor)
sql-server index sp-blitzindex
sql-server index sp-blitzindex
asked Mar 25 at 12:53
Learning_DBAdminLearning_DBAdmin
416214
asked Mar 25 at 12:53
Learning_DBAdminLearning_DBAdmin
416214
asked Mar 25 at 12:53
Learning_DBAdminLearning_DBAdmin
416214
asked Mar 25 at 12:53
Learning_DBAdminLearning_DBAdmin
416214
asked Mar 25 at 12:53
Learning_DBAdminLearning_DBAdmin
416214
416214
1
Silly question: why not create a clustered index? it looks like if you created one onA, it would solve a few different problems? Is the identity column a nonclustered primary key?
– Erik Darling
Mar 25 at 13:04
@ErikDarling Trying to learn from many experts in the forum. Apologies for silly question.I wish, I could have been in the position to create clustered index. Since, its a vendor supported code, don't have much room for change. Yes, primary key is created as non-clustered column.
– Learning_DBAdmin
Mar 25 at 13:53
I didn't mean your question was silly, I meant mine was. I understand the pain of supporting a vendor database. But to get things right, you can create nonclustered indexes, but not clustered indexes?
– Erik Darling
Mar 25 at 13:57
@ErikDarling Clustered index poses many constraints like null, duplicates etc whereas non-clustered doesn't pose any risk for vendor and they agree on it easily. I have tried many times for clustered index creation however have faced so much resistance from them.I will try once again with them to create clustered index on A column, I would also see if we can have clustered index on L & A; this would be safer for them(I guess).
– Learning_DBAdmin
Mar 25 at 14:01
1
No, clustered indexes don't do that. See my demo here.
– Erik Darling
Mar 25 at 14:35
|
show 4 more comments
1
Silly question: why not create a clustered index? it looks like if you created one onA, it would solve a few different problems? Is the identity column a nonclustered primary key?
– Erik Darling
Mar 25 at 13:04
@ErikDarling Trying to learn from many experts in the forum. Apologies for silly question.I wish, I could have been in the position to create clustered index. Since, its a vendor supported code, don't have much room for change. Yes, primary key is created as non-clustered column.
– Learning_DBAdmin
Mar 25 at 13:53
I didn't mean your question was silly, I meant mine was. I understand the pain of supporting a vendor database. But to get things right, you can create nonclustered indexes, but not clustered indexes?
– Erik Darling
Mar 25 at 13:57
@ErikDarling Clustered index poses many constraints like null, duplicates etc whereas non-clustered doesn't pose any risk for vendor and they agree on it easily. I have tried many times for clustered index creation however have faced so much resistance from them.I will try once again with them to create clustered index on A column, I would also see if we can have clustered index on L & A; this would be safer for them(I guess).
– Learning_DBAdmin
Mar 25 at 14:01
1
No, clustered indexes don't do that. See my demo here.
– Erik Darling
Mar 25 at 14:35
1
1
Silly question: why not create a clustered index? it looks like if you created one on
A, it would solve a few different problems? Is the identity column a nonclustered primary key?– Erik Darling
Mar 25 at 13:04
Silly question: why not create a clustered index? it looks like if you created one on
A, it would solve a few different problems? Is the identity column a nonclustered primary key?– Erik Darling
Mar 25 at 13:04
@ErikDarling Trying to learn from many experts in the forum. Apologies for silly question.I wish, I could have been in the position to create clustered index. Since, its a vendor supported code, don't have much room for change. Yes, primary key is created as non-clustered column.
– Learning_DBAdmin
Mar 25 at 13:53
@ErikDarling Trying to learn from many experts in the forum. Apologies for silly question.I wish, I could have been in the position to create clustered index. Since, its a vendor supported code, don't have much room for change. Yes, primary key is created as non-clustered column.
– Learning_DBAdmin
Mar 25 at 13:53
I didn't mean your question was silly, I meant mine was. I understand the pain of supporting a vendor database. But to get things right, you can create nonclustered indexes, but not clustered indexes?
– Erik Darling
Mar 25 at 13:57
I didn't mean your question was silly, I meant mine was. I understand the pain of supporting a vendor database. But to get things right, you can create nonclustered indexes, but not clustered indexes?
– Erik Darling
Mar 25 at 13:57
@ErikDarling Clustered index poses many constraints like null, duplicates etc whereas non-clustered doesn't pose any risk for vendor and they agree on it easily. I have tried many times for clustered index creation however have faced so much resistance from them.I will try once again with them to create clustered index on A column, I would also see if we can have clustered index on L & A; this would be safer for them(I guess).
– Learning_DBAdmin
Mar 25 at 14:01
@ErikDarling Clustered index poses many constraints like null, duplicates etc whereas non-clustered doesn't pose any risk for vendor and they agree on it easily. I have tried many times for clustered index creation however have faced so much resistance from them.I will try once again with them to create clustered index on A column, I would also see if we can have clustered index on L & A; this would be safer for them(I guess).
– Learning_DBAdmin
Mar 25 at 14:01
1
1
No, clustered indexes don't do that. See my demo here.
– Erik Darling
Mar 25 at 14:35
No, clustered indexes don't do that. See my demo here.
– Erik Darling
Mar 25 at 14:35
|
show 4 more comments
1 Answer
1
active
oldest
votes
5
sp_BlitzIndex is just taking SQL Server's recommendations straight from sys.dm_db_missing_index_details, which have a lot of gotchas:
- They'll recommend indexes similar to indexes that already exist
- They have minimal concern about the speed of delete/update/insert (DUI) operations, and will recommend so many indexes that your DUIs will slow down
- They'll recommend indexes that are way too large (too many fields) that your hardware may not be able to support
- The fields aren't necessarily in the order - the missing index recommendation key order is driven by field order in the table
- They won't recommend clustered indexes
With all that in mind, sp_BlitzIndex is a tool to be used with training, just like any other tool. You're on the right track by thinking about a clustered index first - I'd start there before adding nonclustered indexes.
answered Mar 25 at 13:05
Brent OzarBrent Ozar
35.7k19109241
add a comment |
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "182"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
draft saved
draft discarded
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fdba.stackexchange.com%2fquestions%2f233020%2fsuggestion-on-missing-index-creation%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
5
sp_BlitzIndex is just taking SQL Server's recommendations straight from sys.dm_db_missing_index_details, which have a lot of gotchas:
- They'll recommend indexes similar to indexes that already exist
- They have minimal concern about the speed of delete/update/insert (DUI) operations, and will recommend so many indexes that your DUIs will slow down
- They'll recommend indexes that are way too large (too many fields) that your hardware may not be able to support
- The fields aren't necessarily in the order - the missing index recommendation key order is driven by field order in the table
- They won't recommend clustered indexes
With all that in mind, sp_BlitzIndex is a tool to be used with training, just like any other tool. You're on the right track by thinking about a clustered index first - I'd start there before adding nonclustered indexes.
answered Mar 25 at 13:05
Brent OzarBrent Ozar
35.7k19109241
add a comment |
5
sp_BlitzIndex is just taking SQL Server's recommendations straight from sys.dm_db_missing_index_details, which have a lot of gotchas:
- They'll recommend indexes similar to indexes that already exist
- They have minimal concern about the speed of delete/update/insert (DUI) operations, and will recommend so many indexes that your DUIs will slow down
- They'll recommend indexes that are way too large (too many fields) that your hardware may not be able to support
- The fields aren't necessarily in the order - the missing index recommendation key order is driven by field order in the table
- They won't recommend clustered indexes
With all that in mind, sp_BlitzIndex is a tool to be used with training, just like any other tool. You're on the right track by thinking about a clustered index first - I'd start there before adding nonclustered indexes.
answered Mar 25 at 13:05
Brent OzarBrent Ozar
35.7k19109241
add a comment |
5
5
5
sp_BlitzIndex is just taking SQL Server's recommendations straight from sys.dm_db_missing_index_details, which have a lot of gotchas:
- They'll recommend indexes similar to indexes that already exist
- They have minimal concern about the speed of delete/update/insert (DUI) operations, and will recommend so many indexes that your DUIs will slow down
- They'll recommend indexes that are way too large (too many fields) that your hardware may not be able to support
- The fields aren't necessarily in the order - the missing index recommendation key order is driven by field order in the table
- They won't recommend clustered indexes
With all that in mind, sp_BlitzIndex is a tool to be used with training, just like any other tool. You're on the right track by thinking about a clustered index first - I'd start there before adding nonclustered indexes.
answered Mar 25 at 13:05
Brent OzarBrent Ozar
35.7k19109241
sp_BlitzIndex is just taking SQL Server's recommendations straight from sys.dm_db_missing_index_details, which have a lot of gotchas:
- They'll recommend indexes similar to indexes that already exist
- They have minimal concern about the speed of delete/update/insert (DUI) operations, and will recommend so many indexes that your DUIs will slow down
- They'll recommend indexes that are way too large (too many fields) that your hardware may not be able to support
- The fields aren't necessarily in the order - the missing index recommendation key order is driven by field order in the table
- They won't recommend clustered indexes
With all that in mind, sp_BlitzIndex is a tool to be used with training, just like any other tool. You're on the right track by thinking about a clustered index first - I'd start there before adding nonclustered indexes.
answered Mar 25 at 13:05
Brent OzarBrent Ozar
35.7k19109241
answered Mar 25 at 13:05
Brent OzarBrent Ozar
35.7k19109241
answered Mar 25 at 13:05
Brent OzarBrent Ozar
35.7k19109241
answered Mar 25 at 13:05
Brent OzarBrent Ozar
35.7k19109241
35.7k19109241
add a comment |
add a comment |
draft saved
draft discarded
Thanks for contributing an answer to Database Administrators Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
draft saved
draft discarded
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fdba.stackexchange.com%2fquestions%2f233020%2fsuggestion-on-missing-index-creation%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
1
Silly question: why not create a clustered index? it looks like if you created one on
A, it would solve a few different problems? Is the identity column a nonclustered primary key?– Erik Darling
Mar 25 at 13:04
@ErikDarling Trying to learn from many experts in the forum. Apologies for silly question.I wish, I could have been in the position to create clustered index. Since, its a vendor supported code, don't have much room for change. Yes, primary key is created as non-clustered column.
– Learning_DBAdmin
Mar 25 at 13:53
I didn't mean your question was silly, I meant mine was. I understand the pain of supporting a vendor database. But to get things right, you can create nonclustered indexes, but not clustered indexes?
– Erik Darling
Mar 25 at 13:57
@ErikDarling Clustered index poses many constraints like null, duplicates etc whereas non-clustered doesn't pose any risk for vendor and they agree on it easily. I have tried many times for clustered index creation however have faced so much resistance from them.I will try once again with them to create clustered index on A column, I would also see if we can have clustered index on L & A; this would be safer for them(I guess).
– Learning_DBAdmin
Mar 25 at 14:01
1
No, clustered indexes don't do that. See my demo here.
– Erik Darling
Mar 25 at 14:35