{"id":106,"date":"2012-06-23T14:49:34","date_gmt":"2012-06-23T14:49:34","guid":{"rendered":"http:\/\/www.developercookies.net\/?p=106"},"modified":"2020-12-26T09:33:29","modified_gmt":"2020-12-26T09:33:29","slug":"non-clustered-on-sequential-unique-identifier-vs-non-sequential-unique-identifier","status":"publish","type":"post","link":"https:\/\/www.developercookies.net\/de\/non-clustered-on-sequential-unique-identifier-vs-non-sequential-unique-identifier\/","title":{"rendered":"Non clustered index on NON-SEQUENTIAL unique identifier vs. SEQUENTIAL unique identifier"},"content":{"rendered":"<p>If you have a non clustered index on unique identifier you might have identified a serious&nbsp;performance problem.<\/p>\n<p>The SQL server creates for each non clustered index a separate table. By inserting a unique identifier with &#8220;NEWUID() stored procedure&#8221; each new data row has to be inserted somewhere within the table which needs a lot of performance and creates fragmentation of the table. In this case you need a function to be sure the insertion process will be made at the end of the table.<\/p>\n<p><!--more-->In real life you should prevent creating a non clustered index on an unique identifier but on the SQL Server side you have the option to use the &#8220;NEWSEQUENTIALID() stored procedure&#8221;. It generates an sequencial unique id based of the Windows restarting time. With this procedure you might to reach almost the same inserting performance like a non clustered index on a INT IDENTITY column. Regarding to the sequencial ascendending numbers it has the advantage that the SQL Server inserts the new rows at the end of the table.<\/p>\n<p>In my example I could reduce the performance costs over 60% (see image TableIXIDReferenceTime vs. TableIXIDReferenceSequencialTime)!<\/p>\n<p><a href=\"http:\/\/www.developercookies.net\/wp-content\/uploads\/2012\/06\/sample_messages.jpg\"><img decoding=\"async\" class=\"alignnone size-full wp-image-109\" title=\"sample_messages\" src=\"http:\/\/www.developercookies.net\/wp-content\/uploads\/2012\/06\/sample_messages.jpg\" alt=\"\" width=\"557\" height=\"62\" srcset=\"https:\/\/www.developercookies.net\/wp-content\/uploads\/2012\/06\/sample_messages.jpg 557w, https:\/\/www.developercookies.net\/wp-content\/uploads\/2012\/06\/sample_messages-300x33.jpg 300w, https:\/\/www.developercookies.net\/wp-content\/uploads\/2012\/06\/sample_messages-500x55.jpg 500w\" sizes=\"(max-width: 557px) 100vw, 557px\" \/><\/a><\/p>\n<p>Below you find the SQL-Query-Scripts which I used for the performance tests.<\/p>\n<p>Creating Tables:<\/p>\n<pre class=\"brush:sql\">Create Table Test.Table_Heap\r\n(\r\n  ID int IDENTITY(1,1),\r\n  FirstName nvarchar(100),\r\n  LastName nvarchar(100),\r\n  Comments nvarchar(400),\r\n  IDReference uniqueidentifier );\r\nGO\r\n\r\nCreate Table Test.Table_IX_ID\r\n(\r\n  ID int IDENTITY(1,1),\r\n  FirstName nvarchar(100),\r\n  LastName nvarchar(100),\r\n  Comments nvarchar(400),\r\n  IDReference uniqueidentifier\r\n);\r\nGO\r\nCREATE CLUSTERED INDEX IX_ID\r\n  ON Test.Table_IX_ID(ID);\r\n GO\r\n\r\nCREATE Table Test.Table_IX_IDReference\r\n(\r\n  ID int IDENTITY(1,1),\r\n  FirstName nvarchar(100),\r\n  LastName nvarchar(100),\r\n  Comments nvarchar(400),\r\n  IDReference uniqueidentifier\r\n);\r\nGO\r\nCREATE CLUSTERED INDEX IX_IDReference\r\n  ON Test.Table_IX_IDReference(IDReference);\r\nGO\r\n\r\nCREATE Table Test.Table_IX_IDReferenceSequential\r\n(\r\n  ID int IDENTITY(1,1),\r\n  FirstName nvarchar(100),\r\n  LastName nvarchar(100),\r\n  Comments nvarchar(400),\r\n  IDReference uniqueidentifier DEFAULT NEWSEQUENTIALID()\r\n);\r\nGO\r\nCREATE CLUSTERED INDEX IX_IDReferenceSequential\r\n  ON Test.Table_IX_IDReferenceSequential(IDReference);\r\nGO<\/pre>\n<p>Inserting Data:<\/p>\n<pre class=\"brush:sql\">DECLARE @Counter INT;\r\nDECLARE @StartTime DATETIME2;\r\nDECLARE @StopTableHeapTime DATETIME2;\r\nDECLARE @StopTableIXIDTime DATETIME2;\r\nDECLARE @StopTableIXIDReferenceTime DATETIME2;\r\nDECLARE @StopTableIXIDReferenceSequentialTime DATETIME2;\r\n\r\nSET NOCOUNT ON;\r\n\r\nSET @StartTime = SYSDATETIME();\r\nPRINT 'Loading Table_Heap...';\r\nSET  @Counter = 0; WHILE (@COUNTER &lt; 300000)\r\nBEGIN\r\n  INSERT INTO Test.Table_Heap\r\n  (\"FirstName\", \"LastName\", \"Comments\", \"IDReference\")\r\n  VALUES   ('A','B','C',NEWID())\r\n    SET @Counter +=1;\r\nEND\r\nPRINT 'Table_Heap loaded.';\r\nSET @StopTableHeapTime = SYSDATETIME();\r\n\r\nPRINT 'Loading Table_IX_ID...';\r\nSET  @Counter = 0; WHILE (@COUNTER &lt; 300000)\r\nBEGIN\r\n  INSERT INTO Test.Table_IX_ID\r\n   (\"FirstName\", \"LastName\", \"Comments\", \"IDReference\")\r\n  VALUES   ('A','B','C',NEWID())\r\n    SET @Counter +=1;\r\nEND\r\nPRINT 'Table_IX_ID loaded.';\r\n\r\nSET @StopTableIXIDTime = SYSDATETIME();\r\nPRINT 'Loading Table_IX_IDReference...';\r\nSET  @Counter = 0; WHILE (@COUNTER &lt; 300000)\r\nBEGIN\r\n  INSERT INTO Test.Table_IX_IDReference\r\n   (\"FirstName\", \"LastName\", \"Comments\", \"IDReference\")\r\n  VALUES\r\n   ('A','B','C',NEWID())\r\n    SET @Counter +=1;\r\nEND\r\nPRINT 'Table_IX_IDReference loaded.';\r\n\r\nSET @StopTableIXIDReferenceTime = SYSDATETIME();\r\nPRINT 'Loading Table_IX_IDReferenceSequential...';\r\nSET  @Counter = 0;\r\nWHILE (@COUNTER &lt; 300000)\r\nBEGIN\r\n  INSERT INTO Test.Table_IX_IDReferenceSequential\r\n   (\"FirstName\", \"LastName\", \"Comments\")\r\n  VALUES\r\n   ('A','B','C')\r\n    SET @Counter +=1;\r\nEND\r\nPRINT 'Table_IX_IDReferenceSequential loaded.';\r\n\r\nSET @StopTableIXIDReferenceSequentialTime = SYSDATETIME();\r\n\r\nSELECT DATEDIFF(second,@StartTime, @StopTableHeapTime) AS \"TableHeapTime\",\r\n  DATEDIFF(second,@StopTableHeapTime, @StopTableIXIDTime) AS \"TableIXIDTime\",\r\n  DATEDIFF(second,@StopTableIXIDTime, @StopTableIXIDReferenceTime) AS \"TableIXIDReferenceTime\",\r\n  DATEDIFF(second,@StopTableIXIDReferenceTime, @StopTableIXIDReferenceSequentialTime) AS TableIXIDReferenceSequencialTime;<\/pre>","protected":false},"excerpt":{"rendered":"<p>If you have a non clustered index on unique identifier you might have identified a serious&nbsp;performance problem. The SQL server creates for each non clustered index a separate table. By inserting a unique identifier with &#8220;NEWUID() stored procedure&#8221; each new data row has to be inserted somewhere within the table which needs a lot of [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":579,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ngg_post_thumbnail":0,"footnotes":""},"categories":[26],"tags":[37],"class_list":["post-106","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sql-server","tag-featured"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Non clustered index on NON-SEQUENTIAL unique identifier vs. SEQUENTIAL unique identifier - Developer Cookies Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.developercookies.net\/de\/non-clustered-on-sequential-unique-identifier-vs-non-sequential-unique-identifier\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Non clustered index on NON-SEQUENTIAL unique identifier vs. SEQUENTIAL unique identifier - Developer Cookies Blog\" \/>\n<meta property=\"og:description\" content=\"If you have a non clustered index on unique identifier you might have identified a serious&nbsp;performance problem. 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