{"id":920,"date":"2009-03-17T16:19:00","date_gmt":"2009-03-17T16:19:00","guid":{"rendered":"\/blogs\/paul\/post\/FILESTREAM-directory-structure-where-do-the-GUIDs-come-from.aspx"},"modified":"2017-06-22T06:11:42","modified_gmt":"2017-06-22T13:11:42","slug":"filestream-directory-structure-where-do-the-guids-come-from","status":"publish","type":"post","link":"https:\/\/www.sqlskills.com\/blogs\/paul\/filestream-directory-structure-where-do-the-guids-come-from\/","title":{"rendered":"FILESTREAM directory structure – where do the GUIDs come from?"},"content":{"rendered":"

I’m teaching the Microsoft Certified Masters – Database qualification this week here in Redmond, and in part of day one I discuss the FILESTREAM directory structure. I was asked the question where do the directory name GUIDs come from?<\/em> so I started digging around in the system tables while Kimberly was lecturing. Take a look at my previous blog post (FILESTREAM directory structure<\/a>) from last week to see the database schema I’m working with. I recreated it again and wrote some queries to find where the GUIDs are stored, as they have to be stored in the database somewhere.<\/p>\n

Here’s the query to find all the FILESTREAM directory names, for both levels of directory (and you have to run this through the DAC as it’s accessing undocumented, hidden system tables):<\/p>\n

\r\nSELECT\r\n    [o].[name] AS [Table],\r\n    [cp].[name] AS [Column],\r\n    [p].[partition_number] AS [Partition],\r\n    [r].[rsguid] AS [Rowset GUID],\r\n    [rs].[colguid] AS [Column GUID]\r\nFROM sys.sysrowsets [r] CROSS APPLY sys.sysrscols [rs]\r\nJOIN sys.partitions [p]\r\n    ON [rs].[rsid] = [p].[partition_id]\r\nJOIN sys.objects [o]\r\n    ON [o].[object_id] = [p].[object_id]\r\nJOIN sys.syscolpars [cp]\r\n    ON [cp].[colid] = [rs].[rscolid]\r\nWHERE [rs].[colguid] IS NOT NULL\r\n    AND [o].[object_id] = [cp].[id]\r\n    AND [r].[rsguid] IS NOT NULL\r\n    AND [r].[rowsetid] = [rs].[rsid];\r\nGO\r\n<\/pre>\n
See below for a screenshot of this using my scenario.<\/p>\n
\"\"<\/p>\n
You can see that I’m connected through the admin connection in SSMS and that the top-level directory name is derived from the rowset GUID, with the column-level directory name is derived from the column GUID. Note that some parts are byte-reversed, but they’re definitely the right GUIDs.<\/p>\n
Enjoy!<\/p>\n","protected":false},"excerpt":{"rendered":"
I’m teaching the Microsoft Certified Masters – Database qualification this week here in Redmond, and in part of day one I discuss the FILESTREAM directory structure. I was asked the question where do the directory name GUIDs come from? so I started digging around in the system tables while Kimberly was lecturing. Take a look […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[41,86,100],"tags":[],"class_list":["post-920","post","type-post","status-publish","format-standard","hentry","category-filestream","category-sql-server-2008","category-undocumented-commands"],"yoast_head":"\nFILESTREAM directory structure - where do the GUIDs come from? - Paul S. 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