tailieunhanh - Introducing Windows Azure- P10

Introducing Windows Azure- P10: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 Listing 1-8. The Context Query Class Derived from TableStorageDataServiceContext Implemented in a Data Table Storage public class UserDataContext TableStorageDataServiceContext . public DataServiceOuery Address AddressTable get CreateOuery Address AddressTable . Note The compiler does not provide detailed information about why the data storage generation failed. Hopefully the information will be available from Microsoft in future releases. Using PartitionKey and RowKey to Organize the Data to be Distributed In order to support load balancing tables and therefore entities in the cloud are partitioned across storage nodes which may be physically located in different servers. Each partition holds a consecutive range of entities that have the same partition key value which is how partitions are organized. As noted above we specify the partition key as the PartitionKey property in a table and it must be unique to allow for consecutive ordering into partitions. This sounds familiar because the partition key forms part of an entity s primary key in combination with RowKey. The data can be organized based on the usage of PartitionKey and RowKey for each data table entity. By design the values for both PartitionKey and RowKey could be empty strings whereas null values are not allowed. Table 1-2 below shows possible combinations of PartitionKey and RowKey. Table 1-2. UsingPartitionKey andRowKey to Organize the Table Structures PartitionKey RowKey Usage Conditions Empty string Empty string One partition or one row Has value Empty string Multiple partitions or one row Empty string Has value One partition or multiple rows per a partition Has value Has value Multiple partitions of multiple rows for each partition 18 CHAPTER 1 CREATE CLOUD TABLE STORAGE Create Cloud Data Storage with Relational Data Structure Migrating existing relational data storage from an on-premises system to a cloud environment is a .

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