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You can find out more information about the Carbonite Unlimited Cloud Backup: 1-Yr Subscription over at our deals store at the link below. You’ll notice here we aren’t using the Retrieve method but the CreateQuery which will allow you to construct and execute queries with LINQ.  There are limitations to CreateQuery as it has been specifically optimized for working with Azure Table Storage, but you can review all the supported LINQ operations available. Although we are specifying a Partition Key as part of our query, because this is crossing Partition boundaries, this has the potential of being a fairly inefficient queries depending on the number of entities per partition as well as the number of partitions involved. This is only a high level view of some of the Azure Storage architecture, but a detailed paper is available for ground level details.
All our queries up to now have all either required the Partition Key, Row Key or both.  But the Partition and Row Key are usually not the only two properties on a table entity.
Including a Partition Key with every query can drastically help with performance.  This is even more noticeable for data under heavy load. Exponential Retry Policy will force the period of time between retries to grow exponentially in such a way that the above example will fire the first retry at 5 seconds, 10 seconds between the next retry, then 20 seconds, and so on, until the max number of attempts has been reached. A common question asked is how to know if a operation failed and a retry was attempted?  There are a few options available.  One is to use Microsoft’s Enterprise Transient Fault Application Block easily accessible through Nuget and attach to its event handling and built in ability to know about transient faults when they occur.


The problem with this approach is the readability of the code itself being that all execution is handled by the RetryPolicy.  The good news is that we can create a custom policy by implementing the IRetryPolicy Interface that will allow you to handle how you want a retry to occur or extra logic such as logging. The current retry policies available do not retry on HTTP status codes 4xx, 306, 501, 505.  Therefore, if you do write your own custom retry policy you will want to make sure to handle these as well.
Azure has provided a helpful write up on Concurrency for their Storage Services, including some suggestions if requiring a pessimistic concurrency mechanism for your table. As a refresher for those that didn’t read all the intricate details found in the previous article on Blob Storage, a Shared Access Signature is an HMAC SHA-256 hash composed from a number of query string parameters that specify details such as the specific resources, expiration time of the granted access and the permissions granted, just to name a few. The client then could use this Shared Access Signature to ultimately create a CloudTableClient which would be operating under the restrictions placed by the Shared Access Signature. To learn more about our services please speak to one of our solutions consultants on 020 7287 9928 or contact us click here. Click Messaging history, and then click the check box at the very top of your message list. If you meet all of these requirements, you are ready to use the connection wizard to connect to QuickBooks. Shortly, we’ll talk more about how to handle partition sizes as well as some of the requirements for queries that cross server partitions, such as use of continuation tokens.


As soon as you started writing queries that utilize the entity properties you will have moved into the realm of inefficient queries. This is defined as the first constructor’s parameter deltaBackoff.  In addition, we can specify the maximum number of retries.
This will continue to apply for all Skype, Facebook Chat, and Google Talk messages, if you have connected these services to your Microsoft account. Carbonite automatically backs up your files to the Cloud so you can safely restore them after a crash, even if you forgot to back them up. Better yet, on a day to day basis, you can use Carbonite to get your files from any internet-connected computer or mobile device.



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