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If you ask ten database administrators (DBAs) what their job roles are, you ll get ten different answers. For example, one organization may need a DBA to manage the day-to-day administration of SQL Server instances, whereas another organization may want a DBA to write both Transact-SQL (T-SQL) and C# code. Another organization might want a DBA who specializes in SQL Server Integration Services (SSIS) packages, whereas another organization may want a DBA who specializes in database design. The job of DBA encompasses many different roles (and often job titles), and these vary widely from one organization to the next. In short, there is no standard job description for a DBA. This is partly because the job title doesn t have a long history (relational databases were first used in the 1970s, and Microsoft SQL Server Version 4.21 was released in 1993) and partly because the DBA role is quickly evolving as new technologies are released. Because there is no commonly-accepted definition of a DBA, the goal of this chapter is to describe the types of tasks and roles that DBAs commonly perform, with the aim of explaining to those new to the profession what DBAs do day-in and dayout. The first section of this chapter describes many of the tasks DBAs commonly perform. The second section classifies these tasks into specialty roles, as you will rarely find a DBA who performs all of these tasks all the time. Throughout this chapter, I try to answer the question: What does it mean to be a DBA

When you need to tell the same application or object to take two or more actions, as your script does with the Finder, you can use a tell block rather than a series of tell statements A tell block is simply an easier way of giving a sequence of commands to the same application or object

DBAs perform so many different tasks that it is hard to categorize them all. The alphabetized list that follows outlines the common DBA tasks. This list is by no

because the market and the indicator are going in different directions, you have to question whether the market is as strong as it appears Keep in mind that in a bull market you may see an expansion of new highs, while in a bear market, more stocks might be making new lows

Most organizations use some combination of in-house and third-party applications; and few of these applications work in isolation. Therefore, DBAs often have to make disparate applications talk to one another, using a database as the means of sharing data. DBAs commonly get involved in figuring out the best way to integrate applications, and often perform the integration themselves.

A tell block starts with the tell verb and the application or object to which you re giving the instructions, and ends with the statement end tell:

Data grows over time and can become costly to store and difficult to manage. In addition, increased data tends to exacerbate performance problems. DBAs are often responsible for monitoring data size and growth, and determining the best way to store it. In some cases, this may include archiving seldom-used data in another database, or it might mean purging data that is no longer needed. Often, choices are limited, as company policy and government regulations can restrict how and where data is stored.

Between the tell statement and the end tell statement, you enter each command on its own line You ve already told AppleScript which application or object you re working with, so you don t need to tell it again You also don t need to include the to part of the instruction For example, this tell block tells the Finder to open a window showing the contents of your Documents folder and then tells it to close every Finder window:

Another clue traders look for is whether the new highs and new lows have reached extreme levels Of course it s positive if many stocks are making new highs But if too many stocks are making new highs, that could also be a sign that the market is overbought (ie, there is excessive buying) If the market does get overbought, you could see more and more stocks dropping off the new high list Stocks that were once in charge are suddenly losing their leadership If too many stocks drop off the new high list, a change in the trend may be imminent And in a market that is oversold (ie, there is excessive selling), eventually you may see more and more stocks dropping off the new low list This often signals a short-term bottom It is also suggested that you look at the volume bars at the bottom of the chart to confirm whether the market is rising or falling on increased volume Volume is discussed in more detail in Part Three, Understanding Volume

ATTENDING MEETINGS Most DBAs hate attending meetings because it detracts from work time. Meetings are a

fact of working life and, if used wisely, aren t necessarily a waste of time. With correct planning and preparation, meetings are great opportunities for improving communications. The responsibilities of the DBA are often unknown or misunderstood by coworkers, so DBAs should always take advantage of opportunities, such as meetings, to share with others what they do.

Often, it s handy to turn a tell statement into a tell block by pressing RETURN after the name of the application or object and then adding the end tell statement at the end If AppleScript Editor gives the message Syntax Error: Expected end of line but found end of script when you try to compile or run a script, it usually means you ve missed out an end tell statement