TAILIEUCHUNG - Introducing Windows Azure- P7

Introducing Windows Azure- P7:The cloud platform is getting more and more attractive to the computing world. Today, service-oriented architecture (SOA) and aspect-oriented programming (AOP) techniques are widely used in enterprise solutions. A question an IT management team or a software development team may ask is, what is the next trend going to be? Cloud computing seems to be the right answer. | CHAPTER 1 CREATE CLOUD TABLE STORAGE Table 1-1. Value Types Supported by Cloud Table Entity Properties Property Type Details Binary An array of bytes up to 64 KB Bool A Boolean value DateTime A 64-bit value expressed as UTC time range is 1 1 1600 to 12 31 9999 Double A 64-bit floating point value GUID A 128-bit globally unique identifier Int A 32-bit integer Int64 A 64-bit integer String A UTF-16-encoded value may be up to 64 KB PartitionKey. Every table has a special property called PartitionKey. Since the actual data of table storage is physically distributed to many storage nodes which may cross many storage servers running in the cloud the cloud storage system uses this key to manage the storage nodes distribution. RowKey. RowKey is the second key property defined for each table storage. This is the unique ID of the entity and an entity can be identified using the combination of the PartitionKey and RowKey in a table. Timestamp The Timestamp indicates the time a table is created. Partition The Partition is a logical set of entities defined in a table with the same PartitionKey value. Sort Order. A single index is provided for all entities in a table. Data entities are sorted by PartitionKey and then RowKey. This makes queries specifying these keys more efficient. A Closer Look at Entities It s worth having a closer look at entities before we go any further Number of properties The maximum number of properties an entity can define is 255 including PartitionKey RowKey and Timestamp. Type PartitionKey and RowKey are of string type. Timestamp Timestamp is a read-only property. 3 CHAPTER 1 CREATE CLOUD TABLE STORAGE Schema There is no schema stored in Windows Azure tables. The data storage model for properties is a name and typed value pair. A table can not have two entities with the same name but it may have two properties with the same name because they belong to different parent entities. Size ofan entity. The size limit for an entity is 1 MB. This size is the .

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