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Using Third-Party Backup Services
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There are backup solutions that not only back up data, but also re-import the data for you Some of these currently will, or promise future versions that will, also import data for you Each has some peculiarities, but the support is very responsiveThe two currently available services that do SimpleDB backups are SimpleBackr and BackupSDB SimpleBackr is a free SimpleDB backup service hosted at SimpleBackrcom SimpleBackr examines your domains and enables you to start a backup process that saves all the data from all of your domainsThe backup files are saved in JSON format to a bucket in your S3 accountThe bucket structure matches the calendar date on which the backup was taken, and each domain gets its own JSON backup file Figure 5-1 shows a screenshot of SimpleBackrcom
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Figure 5-1
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BackupSDBcom is another website that offers a backup service for SimpleDB domains BackupSDB enables you to select individual domains for backup and individual backups for restore It maintains a detailed backup and restore history log of all your activity on the siteWhen backing up a domain, the data is saved to a set of XML files with 1,000 records per fileThese files are then zipped up into a master backup file BackupSDB is a paid service that also has a free service tier that limits the number of items backed up Figure 5-2 shows a screenshot of the BackupSDB website
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Writing Your Own Backup Tool
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If you decide to write your own backup tool, there are a few things to consider First, and this is true of all SimpleDB backups, there is no way to lock the domainA backup is not going to be a snapshot of the entire domain at one instance in time if changes to your data occur during the backupThe only way around this is if you are able to stop all writes to the domain during the backup However, SimpleDB is designed around data consistency at the item level, and this is maintained in any backup you take SimpleDB is not relational, but you can still have one item reference another However, if you have a relationship between two items that will break if they are not updated atomically, not only do you have a backup problem, but you also have a consistency problem One feature that can be beneficial is a backup verification routine that checks for orphaned items or bad referencesThis function would need access to some minimal knowledge of your data layout, but in return, you would be able to confirm the consistency of your backup or resolve any issues As a mechanism to download your data, use a Select call requesting all attributes and page through the entire domain Setting a sort criterion may be helpful if your SimpleDB usage supports itAs the backup process pages through the data, updates to items you have already fetched will not make it into the backup, whereas updates to items appearing in upcoming pages may make it in If you arrange the sort criteria such that the data most likely to be updated appears in the final pages, you will end up with a backup that is closer to a snapshot in time If most of your updates involve new items with item name
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values that are strictly increasing, use a sort on itemName() If each of your items has a time stamp indicating that last modification time, use that as a sort criterion Be aware that it may take some time for a backup of a large domain to completeTo mitigate this, run the backup from an EC2 instance in the same region to minimize round-trip request latenciesAn obvious step is to run the backup during an off-peak time, and if possible, suspend writes to that domainThat is not always practical, but if it is, it will improve both the speed of the backup and the consistency of the data within the backup file Choose a backup file format that is convenient for restoring Because you are writing your own backup code, and you have to choose a file format of some kind, you might as well make it as easy as possible Keep in mind how you want to be able to restore the data If you want the ability to insert the data into SimpleDB as well as other databases, that will lead you to a different file format than data meant only for SimpleDB If your restore procedure involves multiple simultaneous upload processes, consider saving your data into multiple files
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