{"id":612,"date":"2010-02-04T11:47:00","date_gmt":"2010-02-04T11:47:00","guid":{"rendered":"\/blogs\/bobb\/post\/Filestreams-transactions-and-SQL-Server-2008-R2.aspx"},"modified":"2014-01-20T12:18:34","modified_gmt":"2014-01-20T20:18:34","slug":"filestreams-transactions-and-sql-server-2008-r2","status":"publish","type":"post","link":"https:\/\/www.sqlskills.com\/blogs\/bobb\/filestreams-transactions-and-sql-server-2008-r2\/","title":{"rendered":"Filestreams, transactions and SQL Server 2008 R2"},"content":{"rendered":"<p>\nI was under the impression that the database engine\/programming model changes in SQL Server 2008 R2 were minimal and could be counted on one hand. Today I was running an old demo that I had, having to do with filestreams on the R2 Nov CTP. Usually I run this one line-by-line, but I was in a hurry and ran the whole thing. Funny&#8230;I didn&#39;t remember this few errors caused by limitations when using filestream. Hmmm&#8230;\n<\/p>\n<p>\nIn SQL Server 2008 R2, filestream storage now support snapshots transaction isolation levels. Both flavors, read-committed snapshot and snapshot. This should expand the possibilities for using this feature because, in SQL Server 2008 (non-R2), you can&#39;t even enable either of these isolation levels at the database level if you have a filestream filegroup\/column. Now, you can not only enable the levels, but the filestream goes&nbsp;exhibits the transactional semantics.\n<\/p>\n<p>\nThis is actually&nbsp;doc&#39;d in the SQL Server 2008 R2 BOL, <a href=\"http:\/\/msdn.microsoft.com\/en-us\/library\/ms173763(SQL.105).aspx\">right here<\/a>.&nbsp; BTW, although the chart in the BOL lists the streaming access doesn&#39;t support ReadUncommitted, RepeatableRead, or Serializable iso levels, in my experiments, you don&#39;t use an error using these iso levels with streaming. The stream just doesn&#39;t exhibit the expected transactional semantics.\n<\/p>\n<p>\nSo you can count &#39;em on one hand, &#39;eh? Between this enhancement and the perf improvements blogged <a href=\"http:\/\/blogs.msdn.com\/b\/sqlserverstorageengine\/archive\/2010\/02\/03\/performance-improvement-by-orders-of-magnitude-when-merging-partitions-in-sql-server-2008r2.aspx\" class=\"broken_link\">about<\/a> <a href=\"http:\/\/blogs.msdn.com\/b\/sqlserverstorageengine\/archive\/2010\/01\/18\/improvement-in-minimizing-lockhash-key-collisions-in-sql-server-2008r2-and-its-impact-on-concurrency.aspx\" class=\"broken_link\">recently<\/a>&nbsp;on the SQL Server Storage Engine blog, maybe I&#39;ll need another hand.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I was under the impression that the database engine\/programming model changes in SQL Server 2008 R2 were minimal and could be counted on one hand. Today I was running an old demo that I had, having to do with filestreams on the R2 Nov CTP. Usually I run this one line-by-line, but I was in [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16,30],"tags":[],"class_list":["post-612","post","type-post","status-publish","format-standard","hentry","category-filestream-storage","category-sql-server-2008-r2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.9.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Filestreams, transactions and SQL Server 2008 R2 - Bob Beauchemin<\/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.sqlskills.com\/blogs\/bobb\/filestreams-transactions-and-sql-server-2008-r2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Filestreams, transactions and SQL Server 2008 R2 - Bob Beauchemin\" \/>\n<meta property=\"og:description\" content=\"I was under the impression that the database engine\/programming model changes in SQL Server 2008 R2 were minimal and could be counted on one hand. Today I was running an old demo that I had, having to do with filestreams on the R2 Nov CTP. 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