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SQL Server 2008 and Data Compression


SQL Server 2008 and Data Compression

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Nicholas Cain
Nicholas Cain
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Comments posted to this topic are about the item SQL Server 2008 and Data Compression



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ddoyle
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Thank you for your article. I'd like to know if anyone uses synonyms that point to a different database. I was thinking about moving all of my 'Fact' tables from the general database into a separate database and creating synonyms that point from the general database to the tables in the 'Fact' database. My rationale for this is that I could easily separate and manage the 'Master' tables from the 'Fact' tables and then I could set up the 'Fact' database with compression and leave the general database intact. Has anyone else done anything like this and if so what were your results?
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compression works at the "table" level why would you care to move it out of the database?


* Noel
ddoyle
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Good point. I was thinking it was at the database level. I have other reasons for moving it into a separate database but it appears that compression is irrelevant. Thanks.
Steve Jones
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It doesn't make sense to move fact tables out. As mentioned above, compression works at the table level, and also at the index level. You can compress a table and not the indexes, or vice versa, or compress both.

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hm, good .sql, but is biggest, rsrs i'm never look one this...
because i'm amateur, rsrs
John Rowan
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Good article. It was helpful to know about the allocation units. I am in the process of designing a data mart type application DB where we'll be storing billions of rows in some of our fact tables. I have been looking forward to testing out the performance benefits of data compression. Your timing for this article could not have been better. Thanks for sharing.....

John Rowan

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Nicholas Cain
Nicholas Cain
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The performance benefits and the space savings. I've always found it difficult to get additional storage on our SAN, so compression gives me a lot more leeway from a time perspective to get the disk space I need.

One of the things I neglected to mention was that compressed tables are still compressed further as a part of the SQL Server 2008 compressed backup (or third party backup solution), so your backups could actually be an order of magnitude than what they are currently. This is especially useful when you need to refresh development or test environments from those backups (provided that your dev and test are running a SQL Server edition that supports compression).



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Nice article...Smile



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Great article and I especially like all the links to the references. A good follow-up article might be on how compression improves the performance of applications because more data can reside in buffers in memory instead of disk. Microsoft claims data warehouse performance can be increased by up to 40% due to less disk I/O. See the page compression sections of these articles:

Scaling Up Your Data Warehouse with SQL Server 2008

Best Practices for Data Warehousing with SQL Server 2008




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