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arrange style Use this parameter to tell Excel how to arrange the windows Table 15-6 explains your options active workbook Set this parameter to with active workbook to arrange only the windows of the active workbook This parameter is most useful when you re synchronizing the scrolling of the workbook s windows, as described next, but you can also use it when you want to affect only the active workbook Set this parameter to without active workbook, or simply omit it, to arrange the windows of all the open workbooks sync horizontal This parameter applies only when you re using with active workbook Then you can set this parameter to with sync horizontal (giving you with active workbook and sync horizontal) to synchronize horizontal scrolling in the windows, allowing you to scroll two or more windows in tandem sync vertical This parameter applies only when you re using with active workbook Then you can set this parameter to with sync vertical (giving you with active workbook and sync vertical or with active workbook, sync horizontal and sync vertical) to synchronize vertical scrolling in the windows

ome of the old volume rules may not work as they once did Perhaps the biggest change is the increasing use of algorithmic trading among computers, done at the speed of nanoseconds, primarily done at private hedge funds and trading desks at large banks Insiders at these firms call these strategies statistical arbitrage Everyone else calls it high-frequency trading, or HFT You ll be hearing more about HFT as the US Securities and Exchange Commission (SEC) and Congress try to understand exactly how these high-end, well-guarded strategies affect Wall Street Basically, computers are programmed to place millions of trades, playing havoc with volume, and then canceling them in seconds Unfortunately, as a result of HFT, the reported volume that you see may not have the same meaning as it did in the past Put another way, stock market volume statistics can be misleading If you are going to survive and thrive, you have to be flexible and adjust to the ever-evolving market Reportedly, HFT volume has risen as high as 70 percent on some days What does this mean to you It means that looking only at the total day s volume is not necessarily a reliable indication of market strength In addition, during the next market correction, computer-generated trades with preprogrammed algorithms could turn a correction into a severe crash To try and prevent future flash crashes, the SEC installed new circuit-breaker rules to halt or slow down trades if a stock moves

Summary

What is the solution Consider how long the locks are held and how much is being locked. The default isolation level for SQL Server, READ COMMITTED, will generally only lock one row at a time when it fetches rows. Even inside a transaction, you can get different results for the same query depending on the transaction isolation level. (Only the highest transaction isolation level, serializable, will prevent other users from changing or adding rows that your query has viewed; snapshot isolation level will let your results stay constant by saving changes temporarily for your queries.) However, transaction isolation assumes that the server can discern your actions from the structure of your database. For example, consider the following:

Arranges the windows in an overlapping cascade so that you can see part of each window This command doesn t work at this writing Arranges the windows horizontally for example, one at the top of the screen and one at the bottom Tiles the windows, sharing the screen space as equally as possible among them This is the default arrangement if you don t use the arrange style parameter Arranges the windows vertically for example, one on the left of the screen and one on the right

If I asked you how many rows needed to be locked, you would immediately assume one, right That depends on the indexing of tableNameKey If there is no index, an update will scan every row, and the lock taken could lock all readers out of the table Many locking issues fall into this category, where the query processor has to lock many more rows than would be necessary if it knew that only one row would be affected by this query In SQL Server 2005, Microsoft added in something called SNAPSHOT isolation level In SNAPSHOT isolation level, when you start a transaction, all the data you read will look exactly as it did when you started the transaction Currently executing processes don t lock you out; they maintain the previous version for anyone who wants to see it.

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For example, the following statement tiles all open windows: