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Deadlocks are typically caused by long-running transactions, or different transactions accessing the same objects in an inconsistent order. A lack of useful indexes, poorly written code, and hardware bottlenecks can all cause transactions to run longer than they should, resulting in locks held for longer than necessary. If statements in different stored procedures access tables in different orders (for example, one procedure first updates Table1 and then updates Table2, whereas another procedure first updates Table2 and then Table1), it s possible for two transactions to be holding a lock on the one object and wanting a lock on the other, resulting in a deadlock. Isolation levels higher than the default (Read Committed) can also cause frequent deadlocks, as the locks are held longer, or more intrusive locks are held. This is true with the Serializable isolation level.

sending and receiving messages using electromagnetic fields Gradually, the terminology changed, and wireless became known as radio, television, and electromagnetic communications In the 1980s and 1990s, the term wireless emerged again, this time in a consumer context

A deadlock graph is a representation of the processes involved in a deadlock, the locks that they held, and the resources that they were using. Deadlock graphs contain all the information needed to diagnose the cause of the deadlock, though not necessarily in a form that s easy to understand. You may get a deadlock graph on SQL Server 2005 and SQL Server 2008 in three main ways. SQL Profiler includes a deadlock graph event, and there are two trace flags: 1204 and 1222. Of these, only trace flag 1204 was available on SQL Server 2000.

In this example, you create a subroutine for trimming any leading spaces or trailing spaces off a string of text As mentioned in 5, trimming off spaces is useful when you need to make sure that a string of text you use doesn t start or end with a space for example, to avoid layout problems in documents or errors in sorting To create the subroutine, follow these steps:

Trace flag 1204 is one of the oldest ways to view a deadlock graph, and is the only method available on SQL Server 2000 or earlier.

Wireless telephone sets are used in a specialized communications system called cellular Originally, the cellular communications network was used mainly by traveling business people Nowadays, many people regard cell phones as necessities, and some of them come equipped with extra features such as text messaging, Web browsing, and digital cameras

To produce the deadlock graph, the trace flag needs to be enabled server-wide either using the DBCC TRACEON command (DBCC TRACEON (1204,-1)), or by adding the trace flag to SQL Server s startup parameters (-T1204).

1 In AppleScript Editor, press z-N or choose File | New to create a new script 2 Create the variable myString and assign to it the word agriculture with several leading

Trace flag 1222 works much the same as 1204 does, in that it writes deadlock information into the error log. The results produced by 1222 are far more detailed and easier to read than those produced by 1204. As such, it s preferred over 1204 for producing deadlock information on SQL Server 2005 or 2008. Trace flag 1222 is enabled the same way as 1204 is, by using the TRACEON command (DBCC TRACEON (1222,-1)), or by adding the trace flag to the startup parameters (-T1222).

How Cellular Systems Work A cell phone looks like a cross between a cordless telephone receiver and a walkie-talkie, but smaller The unit contains a radio transmitter and receiver combination called a transceiver Transmission and reception take place on different frequencies, so you can talk and listen at the same time, and easily interrupt the other party if necessary This capability is known as full duplex In an ideal cellular network, all the transceivers are always within range of at least one repeater The repeaters pick up the transmissions from the portable units and retransmit the signals to the telephone network and to other portable units The region of coverage for any repeater (also known as a base station) is called a cell When a cell phone is in motion, say in a car or on a boat, the set goes from cell to cell in the network This situation is shown in Fig 32-1 The curved, dashed line is the path of the vehicle Base stations (dots) transfer access to the cell phone This is called handoff The hexagons show the limits of the transmission/reception range for each base station All the base stations are connected to the regional telephone system This makes it possible for the user of the portable unit to place

set myString to " agriculture "

Despite popular belief, trace flag 3605 doesn t have to be enabled with 1204 or 1222 to write a deadlock graph into the error log.