SQL Server Backup and Restore - Simple Talk

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Large data volumes Chapter 4: Restoring From Full Backup As noted previously, full database restores can be a time-consuming process for large databases, and can quickly eat away at disk space, or even fill up a disk completely. In disaster recovery situations where only a small subset of data has been lost, it often feels frustrating to have to go through a long, full restore process in order to extract what might be only a few rows of data. However, when using only native SQL Server tools, there is no real alternative. If you have licenses for third-party backup and/or data comparison tools, it's worth investigating the possibility of performing what is termed object-level restore. In the case of Red Gate tools, the ones with which I am familiar, their backup products (both SQL Backup and Hyperbac), and SQL Data Compare, offer this functionality. With them, you can compare a backup file directly to a live database, and then restore only the missing object and data, rather than the whole database. Furthermore, Red Gate also offers a different kind of tool to accommodate these large database restore situations, namely SQL Virtual Restore. This tool allows you to mount compressed backups as databases without going through the entire restore process. Since I've yet to use this tool in a production scenario, I won't be including any examples in this book. However, to learn more, check out Brad McGehee's article on Simple Talk, at www.simple-talk.com/sql/sql-tools/brads-sure-guide-to-sql-virtual-restore-/. Restoring databases containing sensitive data If we simply go ahead and perform a full database restore of a production database onto one of our development or testing instances, we could inadvertently be breaking a lot of rules. It's possible that the production instance stores sensitive data and we do not want every developer in the company accessing social security numbers and bank account information, which would be encrypted in production, on their development machines! 118
Chapter 4: Restoring From Full Backup It would only take one rogue employee to steal a list of all clients and their sensitive information to sell to a competitor or, worse, a black market party. If you work at a financial institution, you may be dealing on a daily basis with account numbers, passwords and financial transaction, as well as sensitive user information such as social security numbers and addresses. Not only will this data be subject to strict security measures in order to keep customers' information safe, it will also be the target of government agencies and their compliance audits. More generally, while the production servers receive the full focus of attempts to deter and foil hackers, security can be a little lacking in non-production environments. This is why development and QA servers are a favorite target of malicious users, and why having complete customer records on such servers can cause big problems, if a compromise occurs. So, what's the solution? Obviously, for development purposes, we need the database schemas in our development and test servers to be initially identical to the schema that exists in production, so it's common practice, in such situations, to copy the schema but not the data. There are several ways to do this. • Restore the full database backup, but immediately truncate all tables, purging all sensitive data. You may then need to shrink the development copy of your database; you don't want to have a 100 GB database shell if that space is never going to be needed. Note that, after a database shrink, you should always rebuild your indexes, as they will get fragmented as a result of such an operation. • Use a schema comparison tool, to synch only the objects of the production and development databases. • Wipe the database of all user tables and use SSIS to perform a database object transfer of all required user objects. This can be set up to transfer objects only and to ignore any data included in the production system. 119
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The Red Gate Guide SQL Server Backu
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Copyright April 2012 ISBN 978-1-906
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Maintenance plan backups __________
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Preparing for Log Backups _________
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Log Backups _______________________
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About the author Shawn McGehee Shaw
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Introduction jobs scheduled to back
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Introduction backups, to file and e
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Introduction • Chapters 5 and 6 c
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Chapter 1: Basics of Backup and Res
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SQL Server and .NET Tools from Red
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SQL Prompt Pro Write, edit, and exp
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SQL Monitor SQL Server performance
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SQL Toolbelt The essential SQL Serv
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.NET Reflector ® Decompile, browse
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Brad's Sure Guide to SQL Server Mai
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