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#WHY DOES CLOUDBERRY BACKUP TAKE SO SLOW FULL#
Here’s a list of things you can do to make restoring a full backup go faster: This will be even more so if there are a very large number of virtual log files (thousands) in the transaction log, as that hugely slows down the mechanism that rolls back uncommitted transactions. Phase 5 above might be the longest phase in the restore process if there were any long-running, uncommitted transactions when the backup was performed. This is done as a separate phase rather than being done in parallel with phases 1 and 2, and for a deep investigation of this, see Bob Ward’s recent blog post. Phase 3 above can often be the longest phase in the restore process, and is proportional to the size of the transaction log. (Optionally test all page checksums during phase 2, perform decompression if the backup is compressed, and perform decryption if the backup is encrypted.).Copy transaction log from the backup to the log file.Create the log file and zero initialize it. The log file must always be zero initialized when created (see this post for more details).Copy data from the backup to the data files.Create the data files (and zero initialize them if instant file initialization is not enabled).
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(Optionally test all page checksums, optionally perform backup compression, and optionally perform backup encryption).Ī full restore has the following main phases:.This is necessary so the database can be recovered to a consistent point in time during the restore process (see this post for more details). Read all transaction log from the start of the oldest uncommitted transaction as of the initial checkpoint up to the time that phase 2 finished.The main reason is this: Although most vendors offered unlimited storage, it was only Crashplan who offered unlimited storage AND unlimited bandwidth. Read all in-use data from the data files (technically, reading all allocated extents, regardless of whether all 8 pages in the extent are in use). Answer: After spending a month researching different cloud backup products for home users, I decided to go with Crashplan.The answer is that in cases like that, there’s more work to do during the restore process.Ī full backup has the following main phases: One question I get asked every so often is why it can sometimes take longer to restore a database from a full backup than it took to perform the backup in the first place. If you want to find all of our SQLskills SQL101 blog posts, check out /help/SQL101. We’ll all be blogging about things that we often see done incorrectly, technologies used the wrong way, or where there are many misunderstandings that lead to serious problems.
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For example, they can keep multiple versions of files and can retain deleted files for a period of time to allow recovery.As Kimberly blogged about recently, SQLskills is embarking on a new initiative to blog about basic topics, which we’re calling SQL101. They are much more reliable, and offer more capabilities, than doing it yourself.
#WHY DOES CLOUDBERRY BACKUP TAKE SO SLOW HOW TO#
This allows use of the S3 interface and the Deep Archive storage class is actually cheaper than Glacier itself! You can also use the AWS CLI to upload backups, which is much easier than working with a Glacier Vault.īy the way, if you are purely wanting to use S3/Glacier for "backups", I would highly recommend using traditional backup tools that know how to use S3. However, a much simpler way to use Glacier is to store files in Amazon S3 and then select the Glacier or Glacier Deep Archive storage class. I would recommend that you use tools such as Cloudberry Backup that know how to talk directly to Glacier. You can certainly access Amazon Glacier directly, but it would be via API calls to the Glacier Endpoint. This even makes it slow to list the contents of a Vault. It offers low-cost storage, but it is only accessible via API (not much can be done in the Management Console) and it is very slow because all requests are processed as jobs. When originally released, Amazon Glacier was only accessible directly (rather than via Amazon S3).