{"id":1108,"date":"2008-01-09T10:26:58","date_gmt":"2008-01-09T10:26:58","guid":{"rendered":"\/blogs\/paul\/post\/SQL-Server-2008-Backup-Compression-CPU-Cost.aspx"},"modified":"2013-01-01T21:12:17","modified_gmt":"2013-01-02T05:12:17","slug":"sql-server-2008-backup-compression-cpu-cost","status":"publish","type":"post","link":"https:\/\/www.sqlskills.com\/blogs\/paul\/sql-server-2008-backup-compression-cpu-cost\/","title":{"rendered":"SQL Server 2008: Backup Compression CPU Cost"},"content":{"rendered":"


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Back in September last year I blogged about the native Backup Compression that is in SQL Server 2008 (see here<\/a>) and promised to blog more when CTP-5 came out and I ran some tests. Well, it’s here and I have so here’s some data for you.<\/P>
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I expanded the AdventureWorks database to be 322Mb (random size, but big enough to get a decent sized run-time on my server). I used System Monitor to capture %user-mode CPU time, plus backup\/restore throughput for a compressed and uncompressed backup operation, and then restores.<\/P>
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<\/P>
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1) For the uncompressed backup the average CPU was 5% (the green line at the bottom), the run-time was 39.5s, and, of course, it took 322Mb to store the backup.<\/P>
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<\/P>
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2) For the compressed backup the average CPU was way higher at 25%, BUT the run-time was 21.6s (a 45% improvement), and the backup was stored in 76.7MB (a 4.2x compression ratio). Very cool.<\/P>
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<\/P>
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3) For the restore of the uncompressed backup the average CPU was 8%, and the run-time was 71.0s.<\/P>
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<\/P>
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4) For the restore of the compressed backup the average CPU was 14.5%, and the run-time was 36s (a 50% improvement).<\/P>
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So – to summarize, turning on compression means more CPU and smaller run-times – just what was expected. Note that if you try this on your database you will see different results – the compression ratio and CPU usage is entirely dependent on the data being compressed.<\/P><\/FONT><\/FONT><\/p>\n","protected":false},"excerpt":{"rendered":"

Back in September last year I blogged about the native Backup Compression that is in SQL Server 2008 (see here) and promised to blog more when CTP-5 came out and I ran some tests. Well, it’s here and I have so here’s some data for you. I expanded the AdventureWorks database to be 322Mb (random […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13,66,86],"tags":[],"class_list":["post-1108","post","type-post","status-publish","format-standard","hentry","category-backuprestore","category-performance-tuning","category-sql-server-2008"],"yoast_head":"\nSQL Server 2008: Backup Compression CPU Cost - Paul S. Randal<\/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\/paul\/sql-server-2008-backup-compression-cpu-cost\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SQL Server 2008: Backup Compression CPU Cost - Paul S. Randal\" \/>\n<meta property=\"og:description\" content=\"Back in September last year I blogged about the native Backup Compression that is in SQL Server 2008 (see here) and promised to blog more when CTP-5 came out and I ran some tests. Well, it’s here and I have so here’s some data for you. 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