Hi,There are two types of blobs that can be stored in Windows Azure Storage: block and page blobs. This new feature uses Page blobs, which can be up to 1TB in size, and are more efficient when ranges of bytes in a file are modified frequently. You can access Blobs using the following URL format: http://storageaccount.blob.core.windows.net/<container>/<blob>.
Please refer https://msdn.microsoft.com/en-us/library/dn385720.aspx?f=255&MSPPError=-2147217396
Thanks
Abhishek
Its Microsoft recommendation that when copying the data files to Windows Azure Storage, always create a page blob not a block blob. Otherwise, ALTER Database will fail.
Review the instructions given in Lesson 7 in Tutorial: SQL Server Data Files in Windows Azure Storage service.
For your understanding Azure Storage offers three types of blobs:
- Block blobs,
- Page blobs, and
- Append blobs.
Block blobs are ideal for storing text or binary files, such as documents and media files.
Append blobs are similar to block blobs in that they are made up of blocks, but they are optimized for append operations, so they are useful for logging scenarios. A single block blob or append blob can contain up to 50,000 blocks of up to 4 MB each, for a total size of slightly more than 195 GB (4 MB X 50,000).
Page blobs can be up to 1 TB in size, and are more efficient for frequent read/write operations. Azure Virtual Machines use page blobs as OS and data disks.
For more information about blobs, see Understanding Block Blobs, Page Blobs, and Append Blobs.
@Rachit, it means that read only database copies can be stored on block blob but if need read/write operations then page blob is recommended. Or for Databases only Block Blob is recommended?
@Rachit, it means that read only database copies can be stored on block blob but if need read/write operations then page blob is recommended. Or for Databases only Block Blob is recommended?
Yes, Page BLOBs seem to be targeted at BLOBs that you need random access read or write.
- Block blobs are for your discrete storage objects like jpg's, log files, etc. that you'd typically view as a file in your local OS. Max. size 200GB.
- Page blobs are for random read/write storage, such as VHD's (in fact, page blobs are what's used for Azure Virtual Machine disks). Max. size 1TB. Supported by the new Azure Premium Storage offering.
Any file type can be stored in the Windows Azure BLOB Storage service, such as Image files, database files, text files, or virtual hard drive files. However, when they are uploaded to the service they are stored as either a Page BLOB or a Block BLOB depending on how you plan on using that file or the size of the file you need to work with.
Page BLOBs are optimized for random reads and writes so they are most commonly used when storing virtual hard drive files for virtual machines.
The majority of files that you upload would benefit from being stored as Block BLOBs, which are written to the storage account as a series of blocks and then committed into a single file. We can create a large file by breaking it into blocks, which can be uploaded concurrently and then then committed together into a single file in one operation. This provides us with faster upload times and better throughput. The client storage libraries manage this process by uploading files of less than 64 MB in size in a single operation, and uploading larger files across multiple operations by breaking down the files and running the concurrent uploads. A Block BLOB has a maximum size of 200 GB.
Refer for more details: https://www.simple-talk.com/cloud/cloud-data/an-introduction-to-windows-azure-blob-storage-/
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