{"id":5864,"date":"2015-10-14T08:47:50","date_gmt":"2015-10-14T06:47:50","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/how-to-be-sure-that-tempdb-size-is-good-to-run-a-dbcc-checkdb\/"},"modified":"2015-10-14T08:47:50","modified_gmt":"2015-10-14T06:47:50","slug":"how-to-be-sure-that-tempdb-size-is-good-to-run-a-dbcc-checkdb","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/how-to-be-sure-that-tempdb-size-is-good-to-run-a-dbcc-checkdb\/","title":{"rendered":"How to be sure that tempdb size is good to run a DBCC CHECKDB?"},"content":{"rendered":"

In many blogs or forums, you can read that the answer is to use the option: WITH ESTIMATEONLY.
\nWith this option, you can easily have the space estimation needed to check the database in tempdb. But be careful, only since SQL Server 2014, this estimation has been good<\/strong>!<\/p>\n

See the PS from Paul Randal’s blog for this information, here<\/a><\/p>\n

But between SQL server 2008, 2012 and 2014…and 2016, the result of this query changed! \ud83d\ude15<\/p>\n

<\/p>\n

This article is to give you a generic script to estimate the size of the tempdb for a DBCC CHECKDB.<\/p>\n

Option ESTIMATEONLY for DBCC CHECKDB<\/h3>\n

SQL Server 2008 & SQL Server 2008R2<\/h4>\n

In SQL Server 2008\/R2, the result is 2 tables.<\/p>\n

The first table is the estimated tempdb space needed for CHECKALLOC and the second for CHECKTABLES.<\/p>\n

I don’t need to add both to have the space required. I need to have the greater value.<\/p>\n

\"DBCC<\/a><\/p>\n

SQL Server 2012<\/h4>\n

In SQL Server 2012, the result is just a message (no tables).<\/p>\n

\"DBCC<\/a><\/p>\n

SQL Server 2014<\/h4>\n

In SQL server 2014, the result is the same as SQL Server 2012<\/p>\n

\"DBCC<\/a><\/p>\n

SQL Server 2016<\/h4>\n

In SQL server 2016, the result is the same as SQL Server 2014\u2026No changes!<\/p>\n

\"DBCC<\/a><\/p>\n

Option TABLERESULT for DBCC CHECKDB<\/h3>\n

For SQL Server 2008\/R2, the result doesn\u2019t change. I have the 2 tables without this option.<\/p>\n

SQL Server 2008<\/h4>\n

\"DBCC<\/a><\/p>\n

But for SQL Server 2012, the table result is 2 rows with an error number.
\nThe information that I need is in the row with the error Number 5281<\/strong> in the column Message Text<\/p>\n

SQL Server 2012<\/h4>\n

\"DBCC<\/a><\/p>\n

And for SQL Server 2014 and SQL Server 2016, the result is just one row with the error 5281. It’s good, it’s an useful row! \ud83d\ude42<\/p>\n

SQL Server 2014<\/h4>\n

\"DBCC<\/a><\/p>\n

SQL Server 2016<\/h4>\n

\"DBCC<\/a><\/p>\n

I checked the result for the latest versions of SQL Server, the difference is between 2008 and 2012\/2014\/2016. To create my script, I’m based to SQL Server 2012 and later.<\/p>\n

Generic script for SQL server 2012, 2014 and 2016<\/h3>\n

I create a temporary table to store the result and I will just select all user databases (dbid>4).
\nI use the store procedure sp_MSforeachdb to run the DBCC CHECKDB through all user databases.<\/p>\n

SQL Server 2012<\/h4>\n

\"Script<\/a><\/p>\n

SQL Server 2014 & SQL Server 2016<\/h4>\n

\"Script<\/a><\/p>\n

Then I select only the line with the error number 5281 to be compatible with SQL Server 2012, and I parse the message_text column to have the estimated tempdb space in an integer format.
\n\"Script<\/a><\/p>\n

CHARINDEX('=',message_texte)+1<\/pre>\n
is to have position before the number<\/p>\n
CHARINDEX('.',message_texte)-CHARINDEX('=',message_texte)-1<\/pre>\n
is to have the length between the ‘=’ and the ‘.’<\/p>\n
Then I have the substring and I cast the result in an integer to have the size value in KB.
\nI apply the T-SQL Command MAX() to have the value of the estimated tempdb space<\/p>\n
\"Script<\/a><\/p>\n
I test with SQL Server 2014 and its running good!
\nDon’t forget that it has worked only fine since SQL Server 2014!<\/strong> \ud83d\ude09
\nPerhaps, with luck, in the next CU or SP, SQL Server 2012 will have a correction but I hear nothing for the moment…
\nFinally, I give you my generic script:<\/p>\n
CREATE Table #checkdb_result\n(\n\terror int,       \n\tlevel int,\n\tstate int,\n\tmessage_texte varchar(7000), \n\trepair_level int,\n\tstatus int,\n\tdb_id int,\n\tdb_frag_id int,\n\tobject_id int,\n\tindex_id int,\n\tpartition_id int,\n\talloc_unit_id int,\n\trid_db_id int,\n\trid_prud_id int,\n\tfile_id int,\n\tpage int,\n\tslot int,\n\tref_db_id int,      \n\tref_prud_id int,\n\tref_file int,\n\tref_page int,\n\tref_slot int,\n\tallocation int \n)\n\nEXEC sp_MSforeachdb\n'IF(DB_ID(N''?'')>4) INSERT INTO #checkdb_result EXEC (''DBCC CHECKDB([?]) WITH ESTIMATEONLY, TABLERESULTS'')'\n\nSELECT MAX (CAST(SUBSTRING(message_texte, CHARINDEX('=',message_texte)+1,CHARINDEX('.',message_texte)-CHARINDEX('=',message_texte)-1)AS INT)) AS max_estimated_tempdb_space_KB \nFROM #checkdb_result WHERE error=5281\n\nDROP TABLE #checkdb_result<\/pre>\n","protected":false},"excerpt":{"rendered":"
In many blogs or forums, you can read that the answer is to use the option: WITH ESTIMATEONLY. With this option, you can easily have the space estimation needed to check the database in tempdb. But be careful, only since SQL Server 2014, this estimation has been good! See the PS from Paul Randal’s blog […]<\/p>\n","protected":false},"author":15,"featured_media":5877,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[229,198],"tags":[49,51,265,54,52,566],"type_dbi":[],"class_list":["post-5864","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-database-administration-monitoring","category-database-management","tag-microsoft","tag-sql-server","tag-sql-server-2008","tag-sql-server-2012","tag-sql-server-2014","tag-sql-server-2016"],"acf":[],"yoast_head":"\nHow to be sure that tempdb size is good to run a DBCC CHECKDB? - dbi Blog<\/title>\n<meta name=\"description\" content=\"I propose to have a script to put the result of the DBCC CHECKDB with the option ESTIMATEONLY in a table and compare this result to the size of the tempb.\" \/>\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.dbi-services.com\/blog\/how-to-be-sure-that-tempdb-size-is-good-to-run-a-dbcc-checkdb\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to be sure that tempdb size is good to run a DBCC CHECKDB?\" \/>\n<meta property=\"og:description\" content=\"I propose to have a script to put the result of the DBCC CHECKDB with the option ESTIMATEONLY in a table and compare this result to the size of the tempb.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.dbi-services.com\/blog\/how-to-be-sure-that-tempdb-size-is-good-to-run-a-dbcc-checkdb\/\" \/>\n<meta property=\"og:site_name\" content=\"dbi Blog\" \/>\n<meta property=\"article:published_time\" content=\"2015-10-14T06:47:50+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/CheckDB01-1.png\" \/>\n\t<meta property=\"og:image:width\" content=\"701\" \/>\n\t<meta property=\"og:image:height\" content=\"247\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"St\u00e9phane Haby\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"St\u00e9phane Haby\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/how-to-be-sure-that-tempdb-size-is-good-to-run-a-dbcc-checkdb\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/how-to-be-sure-that-tempdb-size-is-good-to-run-a-dbcc-checkdb\/\"},\"author\":{\"name\":\"St\u00e9phane Haby\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/d0bfb7484ae81c8980fc2b11334f803b\"},\"headline\":\"How to be sure that tempdb size is good to run a DBCC CHECKDB?\",\"datePublished\":\"2015-10-14T06:47:50+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/how-to-be-sure-that-tempdb-size-is-good-to-run-a-dbcc-checkdb\/\"},\"wordCount\":497,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/how-to-be-sure-that-tempdb-size-is-good-to-run-a-dbcc-checkdb\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/CheckDB01-1.png\",\"keywords\":[\"Microsoft\",\"SQL Server\",\"SQL Server 2008\",\"SQL Server 2012\",\"SQL Server 2014\",\"SQL Server 2016\"],\"articleSection\":[\"Database Administration & Monitoring\",\"Database management\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.dbi-services.com\/blog\/how-to-be-sure-that-tempdb-size-is-good-to-run-a-dbcc-checkdb\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/how-to-be-sure-that-tempdb-size-is-good-to-run-a-dbcc-checkdb\/\",\"url\":\"https:\/\/www.dbi-services.com\/blog\/how-to-be-sure-that-tempdb-size-is-good-to-run-a-dbcc-checkdb\/\",\"name\":\"How to be sure that tempdb size is good to run a DBCC CHECKDB? 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