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This allows for distributed data changes while simultaneously ensuring that information is kept synchronized However, since Subscribers can update information only when they have access to the Publisher, you must ensure that you are working over a reliable network connection Merge replication Designed for situations in which you must allow multiple databases to be updated independently but still be kept synchronized This is ideal, for example, if you have unreliable or slow network connections In this scenario, you want users to be able to update their local copies of databases and then reconcile these updates with other servers That s exactly the purpose of merge replication A major challenge in merge replication is determining who wins if a conflict arises For example, consider the situation in which the same database row is updated on two different servers.

When the hierarchy itself changes, preservation of its history can be achieved by following the same steps used to carry out a type 2 change: 1. Create new rows in the dimension table for all members of the hierarchy that is changing. 2. Create new rows in the bridge table reflecting the new status of the hierarchy. If a change involves a member leaving one hierarchy and entering another, both hierarchies will require this processing.

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When this type of conflict occurs, SQL Server automatically resolves it based on a predefined set of rules Either time-based replication can be used or certain servers can be given higher priorities than others In all cases, however, the conflicts are managed and the data is kept consistent on all servers..

Once again, you might be tempted to avoid the ripple Suppose, for example, that a company at the bottom of a hierarchy, Company H, is sold It might appear that this company can be assigned a new key Rows in the bridge table will still associate the old version of the company with the hierarchy but not the new version Figure 10-17 illustrates this state of affairs graphically While all this is true, remember that looking down and looking up require being able to identify a point in the hierarchy to start from Since this will be a natural key, the solution in Figure 10-17 is not sufficient Looking up from Company H, for example, will identify two bottom-level rows: H and H-1 The bridge table still contains rows that associate H with F, E, and A, and these companies are still generating transactions in the fact table.

Figure 8-4 plots data independence vs. data consistency for various types of replication operations. Notice how the latency between updates differs between them.

SQL is also a database language used by programmers to write applications that access a database. The same SQL statements are used for both interactive and programmatic access, so the database access parts of a program can be tested first with interactive SQL and then embedded into the program. In contrast, traditional databases provided one set of tools for programmatic access and a separate query facility for ad hoc requests, without any synergy between the two modes of access.

These orders will be picked up by the query, even if they took place after the change The same would happen A in a looking-down configuration The user cannot be expected to specify a company by its surrogate key, avoiding H but selecting H-1, so an alternative solution is required B E Future transactions with F, E, and A can be disassociated with any version of Company H by following the standard process of putting all C D F members of the hierarchy through a type 2 change, as described earlier New rows are added to the bridge table to reflect the post-change state of affairs In this case, the bridge table will reflect three G H H-1 hierarchies, as shown in Figure 10-18.

NOTE: In some situations, it is perfectly valid to combine different types of replication. The ultimate decision will be based on your business requirements and your technical and physical constraints.

One is the original hierarchy, one is a new hierarchy that does Company H not include any incarnation of Company H, and the Figure 10-17 A relationship change last is the new hierarchy that Company H has joined..

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Now that we ve seen the various operations that might be required to set up and carry out replication, let s look at the actual processes that meet these requirements.