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In Script Editor in Leopard and earlier versions of Mac OS X, the General preferences pane contains only the Default Language pop-up menu and the Show inherited items in dictionary viewer check box The other controls appear in AppleScript Utility, discussed in the section Putting the Script Menu on the Menu Bar in Leopard, later in this chapter

Depending on your workload and I/O capacity, it may take some time for the principal and mirror databases to get fully synchronized after you initially establish a database mirror. If you have less I/O capacity on the mirror side, you will see the

Compactness An obvious asset of IC design is economy of space They are far more compact than equivalent circuits made from discrete components A corollary to this is the fact that more complex circuits can be built, and kept down to a reasonable size, using ICs as compared with discrete components High Speed The interconnections among the components within an IC are physically tiny, making high switching speeds possible Electric currents travel fast, but not instantaneously The less time charge carriers need to get from component X to component Y, in general, the more computations are possible within a given span of time, and the less time is needed for complex operations Low Power Consumption Another advantage of ICs is the fact that they use less power than equivalent discrete-component circuits This is crucial if batteries are to be used for operation Because ICs use so little current, they produce less heat than their discrete-component equivalents This translates into better efficiency It also minimizes the problems that bedevil equipment that gets hot with use, such as frequency drift and generation of internal noise

Summary

Figure 2-3

unrestored log size grow on the mirror side if you are watching in Database Mirroring Monitor Eventually it should catch up, and allow the two databases to become fully synchronized After the databases are synchronized, you are ready to fail over from the principal to the mirror In order to fail over seamlessly, you need to make sure that you have the correct failover partner information added to all of your application connection strings When you are ready, you can switch to high-safety mode and fail over the database After your expected 10 15-second outage, your applications will be running against the principal database on the new server and SAN, in the new location Next, you can remove mirroring from the database, and you will have moved the data, with a brief outage.

Here s what you need to know:

Reliability Integrated circuits fail less often, per component-hour of use, than systems that use discrete components This is because all the component interconnections are sealed within the IC case, preventing corrosion or the intrusion of dust The reduced failure rate translates into less downtime, or time during which the equipment is out of service for repairs Ease of Maintenance Integrated-circuit technology lowers maintenance costs Repair procedures are simplified when failures occur Many appliances use sockets for ICs, and replacement is simply a matter of finding the faulty IC, unplugging it, and plugging in a new one Special desoldering equipment is used with appliances having ICs soldered directly to the circuit boards Modular Construction Modern IC appliances use modular construction In this scheme, individual ICs perform defined functions within a circuit board; the circuit board or card, in turn, fits into a socket and has a specific purpose Computers, programmed with customized software, are used by repair technicians to locate the faulty card in an appliance The whole card can be pulled and replaced, getting the appliance back to the consumer in the shortest possible time Then a computer can be used to troubleshoot the faulty card, getting the card ready for use in the next appliance that happens to come along with a failure in the same card