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You may have observed that the problem of double-counting in Figure 10-16 can be avoided if the query is qualified for a single version of Company E Why not make this a simple requirement for analysis Unfortunately, this is highly impractical Selecting one version of Company E would be easy if you knew the surrogate key values that distinguish the two versions Unfortunately, surrogate keys are meaningless sequence numbers The only way to distinguish the versions would be to qualify on the natural key for Company E and every type 2 attribute, which is highly impractical Unless the dimension is time-stamped, there is no easy way to qualify for a single version of Company E If the dimension is time-stamped, date qualifications must be added to every query that involves the bridge It is far safer to ripple the type 2 change..

point to remember with snapshot replication is that all information from a publication is sent to the client with each refresh Although this reduces the processing overhead required, it can place much greater burdens on bandwidth and networking infrastructure s Transactional replication Used to monitor and record all information about INSERT, UPDATE, and DELETE statements, which is useful if strong data consistency between servers is required Changes to the data contained within databases can be sent to the necessary Subscribers either immediately or at predefined intervals, which ensures that information is kept up-to-date at all Subscribers, but places greater demands on network availability An important feature of transactional replication is that a given piece of information should have only one Publisher Therefore, this method is best for databases in which the information is already logically partitioned.

In this situation, you cannot conclusively state whether there is a value produced by the subquery for which the comparison test holds; there may be or there may not be, depending on the "correct" values for the NULL (unknown) data The ANY comparison operator can be very tricky to use in practice, especially in conjunction with the inequality (<>) comparison operator Here is an example that shows the problem: List the names and ages of all the people in the sales force who do not manage an office It's tempting to express this query as shown on the following page SELECT NAME, AGE FROM SALESREPS WHERE EMPL_NUM <> ANY (SELECT MGR FROM OFFICES) The subquery: SELECT MGR FROM OFFICES obviously produces the employee numbers of the managers, and therefore the query seems to be saying: Find each salesperson who is not the manager of any office.

Having worked through the mechanics of a type 2 change to a dimension with a hierarchy bridge, the process of responding to a change in the hierarchy itself will not be surprising. It is virtually identical.

For example, for a company with multiple store locations, each of which modifies its own sales data only, information can easily be collected at a corporate office Immediate-Updating Subscribers Allows Subscribers to update information and transfer any changes back to the Publisher immediately In the simplest configuration of snapshot or transactional replication, the data transfer will be one-way That is, information will be modified at a Publisher, and these changes will then be transferred to Subscribers However, various business requirements might require Subscribers to be able to update their copies of information In this case, the Immediate-Updating Subscribers option can be used You can enable this option when articles are created for replication Immediate-Updating Subscribers can allow modifications of their local information as long as the Publisher is updated at the same time All other Subscribers to the publication are then updated with the next scheduled update.

But that's not what the query says! What it does say is this: Find each salesperson who, for some office, is not the manager of that office Of course for any given salesperson, it's possible to find some office where that salesperson is not the manager The query results would include all the salespeople and therefore fail to answer the question that was posed! The correct query is: SELECT NAME, AGE FROM SALESREPS WHERE NOT (EMPL_NUM = ANY (SELECT MGR FROM OFFICES)) NAME -------------Mary Jones AGE --31.

As before, a simple relationship change will require putting all members of the hierarchy through a type 2 change. This is necessary to properly isolate new facts from the member that has been removed, since users will be using natural keys to look up or down the hierarchy. Once again, you can skip the explanation if you want, but be sure you understand the mechanics first.