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If we have a REPEATABLE READ isolation, the results from a given query must be consistent with respect to some point in time. Most databases (not Oracle) achieve repeatable reads via the use of row-level shared read locks. A shared read lock prevents other sessions from modifying data that we have read. This, of course, decreases concurrency. Oracle opted for the more concurrent, multi-versioning model to provide read-consistent answers. In Oracle, using multi-versioning, we get an answer that is consistent with respect to the point in time the query began execution. In other databases, using shared read locks, we get an answer that is consistent with respect to the point in time the query completes that is, when we can get the answer at all (more on this in a moment). In a system that employs a shared read lock to provide repeatable reads, we would observe rows in a table getting locked as the query processed them. So, using the earlier example, as our query reads the ACCOUNTS table, it would leave shared read locks on each row, as shown in Table 7-5. Table 7-5. Timeline 1 in Non-Oracle Database Using READ REPEATABLE Isolation

Many of the interaction patterns that occur between software processes are similar to those that occur in the hardware world. When deciding which type of pattern to use, you should first determine whether you need a push or pull interaction. This decision usually depends on who has control of the interaction the caller or the callee. The timing of the interaction (synchronous or asynchronous) is probably the second-most important decision. When creating asynchronous interactions, remember that it is usually better to handle the asynchrony on the caller side than the callee side.

The labels on your pivot chart, a pie chart type, are hidden by the field buttons, and you want to make them visible.

Reads row 1. Sum = $500.00 so far. Block 1 has a shared read lock on it. Reads row 2. Sum = $740.25 so far. Block 2 has a shared read lock on it.

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f you look at lots of different types of software systems, you soon realize that they have certain things in common On the surface, a financial-planning system might not seem to have anything in common with an elevator-control system; a washing-machine program might not seem to have anything in common with a data-decryption system However, if you step back a bit and look at the broader picture, similarities start to emerge For example, all software systems need an initialization process before they can perform their main task Many software systems have a shutdown process when they are terminated All useful software systems must implement some level of business logic The expression business logic is used in the broadest sense and includes the rules of whatever domain the software system is designed for For example, in a temperature-control system, the business rules relate to heating and cooling laws.

Attempts to update row 1 but is blocked. Transaction is suspended until it can obtain an exclusive lock. Reads row N. Sum = . . .

In a flight-control system, the rules relate to controlling the attitude1 and heading of an aircraft according to the laws of aerodynamics In an accounting system, the rules might describe how to calculate a person s withholdings from his gross salary Among the many similarities across software systems, functional roles are important A functional role, often called simply a role, denotes what function a part has in relationship to the rest of the system A part might be an object or a component It is interesting to note that decoupled parts can often operate in a functional role without knowing how the rest of the system works For example, an accounting system part that computes a person s withholdings could do so without knowing why its calculations were needed or where.

Updates row 1 and puts an exclusive lock on this block. Row 1 now has $100.00. Updates row 342,023 and puts an exclusive lock on this block. Row 342,023 now has $500.00. Commits transaction.

If you create a pivot chart that s a pie chart, some of the labels may be hidden by the pivot buttons. To solve the problem, you can hide the PivotChart field buttons, change the angle of the first slice, or reposition the data labels.

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