From f8c6c6d6cc07471fe2cbed91d71ece2896027d3f Mon Sep 17 00:00:00 2001
From: Brent Ozar <brento@brentozar.com>
Date: Sat, 18 Oct 2025 06:44:20 -0700
Subject: [PATCH] #3721 sp_Blitz TempDB RG

Check to see if TempDB config will support RG config for SQL 2025. Closes #3721.
---
 Documentation/sp_Blitz_Checks_by_Priority.md |  5 +-
 sp_Blitz.sql                                 | 60 ++++++++++++++++++++
 2 files changed, 63 insertions(+), 2 deletions(-)

diff --git a/Documentation/sp_Blitz_Checks_by_Priority.md b/Documentation/sp_Blitz_Checks_by_Priority.md
index d59eeb85..af9d6c66 100644
--- a/Documentation/sp_Blitz_Checks_by_Priority.md
+++ b/Documentation/sp_Blitz_Checks_by_Priority.md
@@ -6,8 +6,8 @@ Before adding a new check, make sure to add a Github issue for it first, and hav
 
 If you want to change anything about a check - the priority, finding, URL, or ID - open a Github issue first. The relevant scripts have to be updated too.
 
-CURRENT HIGH CHECKID: 270.
-If you want to add a new one, start at 271.
+CURRENT HIGH CHECKID: 271.
+If you want to add a new one, start at 272.
 
 | Priority | FindingsGroup | Finding | URL | CheckID |
 |----------|-----------------------------|---------------------------------------------------------|------------------------------------------------------------------------|----------|
@@ -131,6 +131,7 @@ If you want to add a new one, start at 271.
 | 170 | File Configuration | High VLF Count | https://www.BrentOzar.com/go/vlf | 69 |
 | 170 | File Configuration | Multiple Log Files on One Drive | https://www.BrentOzar.com/go/manylogs | 41 |
 | 170 | File Configuration | System Database on C Drive | https://www.BrentOzar.com/go/drivec | 24 |
+| 170 | File Configuration | TempDB Governor Config Problem | https://www.BrentOzar.com/go/tempdbrg | 271 |
 | 170 | File Configuration | TempDB Has >16 Data Files | https://www.BrentOzar.com/go/tempdb | 175 |
 | 170 | File Configuration | TempDB Only Has 1 Data File | https://www.BrentOzar.com/go/tempdb | 40 |
 | 170 | File Configuration | TempDB Unevenly Sized Data Files | https://www.BrentOzar.com/go/tempdb | 183 |
diff --git a/sp_Blitz.sql b/sp_Blitz.sql
index 102cbdc2..f011e706 100644
--- a/sp_Blitz.sql
+++ b/sp_Blitz.sql
@@ -6752,6 +6752,66 @@ IF @ProductVersionMajor >= 10
 					END;
 
 
+
+				IF NOT EXISTS ( SELECT  1
+								FROM    #SkipChecks
+								WHERE   DatabaseName IS NULL AND CheckID = 271 )
+					AND EXISTS (SELECT * FROM sys.all_columns WHERE name = 'group_max_tempdb_data_percent')
+						AND EXISTS (SELECT * FROM sys.all_columns WHERE name = 'group_max_tempdb_data_mb')
+					BEGIN
+						
+						IF @Debug IN (1, 2) RAISERROR('Running CheckId [%d].', 0, 1, 271) WITH NOWAIT;
+						
+						IF EXISTS (SELECT * FROM sys.resource_governor_workload_groups
+									WHERE group_max_tempdb_data_percent <> 0
+									  AND group_max_tempdb_data_mb IS NULL)
+							BEGIN
+							DECLARE @TempDBfiles TABLE (config VARCHAR(50), data_files INT)
+							/* Valid configs */
+							INSERT INTO @TempDBfiles
+								SELECT 'Fixed predictable growth' AS config, SUM(1) AS data_files
+									FROM master.sys.master_files
+									WHERE database_id = DB_ID('tempdb')
+									  AND type = 0 /* data */
+									  AND max_size <> -1 /* only limited ones */
+									  AND growth <> 0 /* growth is set */
+									HAVING SUM(1) > 0
+								UNION ALL
+								SELECT 'Growth turned off' AS config, SUM(1) AS data_files
+									FROM master.sys.master_files
+									WHERE database_id = DB_ID('tempdb')
+									  AND type = 0 /* data */
+									  AND max_size = -1 /* unlimited */
+									  AND growth = 0
+									HAVING SUM(1) > 0;
+
+							IF 1 <> (SELECT COUNT(*) FROM @TempDBfiles)
+								OR (SELECT SUM(data_files) FROM @TempDBfiles) <> 
+									(SELECT SUM(1)
+										FROM master.sys.master_files
+										WHERE database_id = DB_ID('tempdb')
+										  AND type = 0 /* data */)
+								BEGIN
+									INSERT INTO #BlitzResults
+										( CheckID ,
+										  Priority ,
+										  DatabaseName ,
+										  FindingsGroup ,
+										  Finding ,
+										  URL ,
+										  Details
+										)														
+									SELECT 271 AS CheckID,
+										   170 AS Priority,
+										   'tempdb',
+										   'File Configuration' AS FindingsGroup,
+										   'TempDB Governor Config Problem' AS Finding,
+										   'https://www.BrentOzar.com/go/tempdbrg' AS URL,
+										   'Resource Governor is configured to cap TempDB usage by percent, but the TempDB file configuration will not allow that to take effect.' AS details
+								END
+							END
+					END
+
 				IF @CheckUserDatabaseObjects = 1
 					BEGIN