Compaq Reliable Transaction Router manual 19 Bank Partitioning Example TR

	RTR Server Types
Partition	When working with database systems, partitioning the database
	can be essential to ensuring smooth and untrammeled
	performance with a minimum of bottlenecks. When you
	partition your database, you locate different parts of your
	database on different disk drives to spread both the physical
	storage of your database onto different physical media and to
	balance access traffic across different disk controllers and drives.
	For example, in a banking environment, you could partition
	your database by account number, as shown in Figure 1–19. A
	partition is a segment of your database.

Figure 1–19 Bank Partitioning Example

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Accts	Accts	Accts	Accts	Accts
	20,000-	40,000-	70,000-	90,000-
1-19,999	39,999	69,999	89,999	99,999
				LKG-11213-98WI
Key range	Once you have decided to partition your database, you use key
	ranges in your application to specify how to route transactions
	to the appropriate database partition. A key range is the
	range of data held in each partition. For example, the key

range for the first partition in the bank partitioning example goes from 00001 to 19999. You can assign a partition name in your application program or have it set by the system manager. Note that sometimes the terms key range and partition are used as synonyms in code examples and samples with RTR,

Introduction 1–21