2.6 Placing data on a specific EADS server (grouping keys)

EADS allows you to group multiple keys together so that related data resides on the same EADS server. This is called grouping keys.

If keys are not grouped, the data is distributed among the EADS servers in the cluster. When data needs to be manipulated for purposes such as obtaining totals, data distributed throughout the cluster must be accessed. Communication is required each time data is acquired from each EADS server.

If you know the keys that will need to be processed and group those keys together, you can place related data on the same EADS server. This enables processing using user functions to be performed on groups, thus improving the efficiency of data processing.

For details about user functions, see 2.7 Efficient data processing using user functions.

Figure 2‒19: Placing data on a specific EADS server (grouping keys)

Organization of this section

• 2.6.1 Grouping keys

• 2.6.2 Data distribution with grouped keys

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