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Units of Power The standard unit of power is the watt, abbreviated W A watt is equivalent to a joule per second ( J/s) Sometimes power is given as kilowatts (kW or thousands of watts), megawatts (MW or millions of watts), or gigawatts (GW or billions of watts) It is also sometimes expressed as milliwatts (mW or thousandths of watts), microwatts ( W or millionths of watts), or nanowatts (nW or billionths of watts) Volt-Amperes In dc circuits, and also in ac circuits having no reactance, power can be defined this way: Power is the product of the voltage across a circuit or component and the current through that same circuit or component Mathematically this is written P = EI If E is in volts and I is in amperes, then P is in volt-amperes (VA) This translates into watts when there is no reactance in the circuit (Fig 17-1) The root-mean-square (rms) values for voltage and current are always used to derive the effective, or average, power Volt-amperes, also called VA power or apparent power, can take various forms A resistor converts electrical energy into heat energy, at a rate that depends on the value of the resistance and the current through it A light bulb converts electricity into light and heat A radio antenna converts high265

Let s imagine that you ve got a new line of business application up and running smoothly. You re extending your disaster recovery plan to include this new application. For database, you re thinking along the lines of log shipping until you read the documentation provided by the vendor: The installation program installs SQL Server 2005 Express Edition. Log shipping is a high availability solution of SQL Server, in which the SQL Server Agent automates the process of generating transaction log backups of the source database, copying them over to a remote SQL Server instance, and restoring them in either no-recovery or read-only, standby mode. It has gained popularity as a high availability solution because of the option to use different hardware for a standby server and the licensing options available for setting it up. This feature is available in the Enterprise Edition for SQL Server 2000, whereas even the Standard and Workgroup Editions of SQL Server 2005 and 2008 have it. But for those who are using editions other than those specified, there are no other options except to do it outside of the supported scenarios. Many third-party applications use editions such as Express and the old Microsoft SQL Server Desktop Engine (MSDE) including those from Microsoft, such as Office SharePoint Server 2007, with its default installation option. This chapter will discuss how to implement log shipping even when Microsoft says it cannot be done. It is important to understand what log shipping does so that we can come up with a process that can implement a similar mechanism. Process is more important than the technology itself. Log shipping consists of three steps:

Show Computer Scripts Select this check box if you want the scripts stored in your Mac s /Library/Scripts/ folder to appear in the Script menu Having these scripts appear is usually helpful at first, especially when you re learning to use AppleScript, so select this check box Later, when you ve stuffed the Script menu with essential scripts you ve created, you may want to suppress the display of the computer scripts so that the Script menu is easy to use

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reactance in an ac component, the power P is the product of the voltage E across the component and the current I through the component

The /Library/Scripts/ folder is referred to either as the computer scripts folder or the local scripts folder Your own scripts folder is the user scripts folder

Back up the transaction log within a specified interval, say every 15 minutes. Copy the log backup from the primary server to the standby server. Restore the copied log backup while leaving the database in either norecovery or read-only, standby mode.

Because we ll be dealing with SQL Server 2005 and 2008 Express Edition (or even SQL Server 2000 editions that do not support log shipping), defining a primary and a standby server could mean working with nonserver operating systems such as Windows 2000 Professional, Windows XP, or even Windows Vista or Windows 7. References to these terms throughout the chapter should not be confused with using Windows server operating systems. Understanding these steps will help you create an automated job that involves all of these processes. First, you need to create a full backup of the database that you will be configuring for log shipping, and restore the backup on the standby SQL Server. Make sure that the restore options for the database should either be read-only and standby or with no recovery (the T-SQL script for this is defined in listing 5, which shows restoreLOG.vbs). This ensures that we can restore additional transaction logs later in the process. After we restore the database backup on the standby server, we are now ready to configure log shipping. The following items are needed:

frequency ac into radio waves A speaker converts low-frequency ac into sound waves The power in these forms is a measure of the intensity of the heat, light, radio waves, or sound waves