Storage Types in Windows Azure
The windows Azure platform
offers different mechanisms to store data permanently. In this article I would
like to introduce the storage types of Windows Azure.
If you want to store data in
Windows Azure you can choose from four different data sources:
Windows Azure Queues:
The Queue service stores message
that may be read by any client who has access to the storage account. A queue
can contain an unlimited number of messages, each of which can be up to 64KB in
size using version 2011 – 08 – 18 or newer. For previous versions, the maximum
size of a message is 8KB. Messages are generally added to the end of the queue
and retrieved from the front of the queue.
If you need to store messages
larger than 64KB, you can store message data as a blob or in a table, and then
store a reference to the data as a message in a queue.
The Queue service exposes the
following resources via the REST API:
Account: The storage account is a uniquely
identified entity within the storage system. The account is the parent namespace
for the Queue service. All queues are associated with an account.
Queue: A queue stores messages that may
be retrieved by a client application or service.
Messages: Messages are XML-compliant and
may be up to 8 KB in size.
Windows Azure Blobs:
The Blob service stores text and
binary data. The Blob service offers the following resources: the storage
account, containers, and blobs. Within your storage account, containers provide
a way to organize sets of blobs.
You can store text and binary
data in either of two types of blobs:
Block blobs, which are optimized for streaming.
Page blobs, which are optimized for random read/write operations and which
provide the ability to write to a range of bytes in a blob.
SQL Azure delivers cloud
database services which enable you to focus on your application, instead of
building, administering and maintaining databases. It is built on SQL Server
technologies and is a component of Windows Azure platform.
The beauty of SQL Azure is that
you as a developer can work with SQL Azure just like you work with your SQL
Server. SQL Azure supports the majority of programming features that you are
used to. You can access it using ADO.NET, Entity Framework or any other data
access technology that you want.
Table Storage in Windows Azure:
In windows azure we can use
Table service API to create tables for structured storage, and to insert,
update, delete, and query data. The Table service API is a REST API for working
with table and the data that they contain.
The Table service API is
compliant with the REST API provided by ADO.NET Data Services, with some
differences. The Table Service API restricts some functionality that is defined
in the ADO.NET Data Services Framework. The API also provides some additional
functionality that is not available through ADO.NET Data Services.
The table service offers
structured storage in the forms of tables. Tables store data as collection of
entities. Entities are similar to rows. An entity has a primary key and set of
properties. A property is a name, typed-value pair, similar to a column.