Pressure: The force per unit area.
The SI unit for pressure is the pascal, which equals one newton per square
meter (P N/m2).
It is very easy to confuse pressure with force. While force is a push or a
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The FROM FILEargument is the path and name of the public key certi-cate
that the dboof the Traderinstance has received somehow from the dbo of the
DMBrokerinstance. The dboof the DMBrokerinstance does the same with the
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Theoretically, we should now be able to exchange messages between
services on these two machines (if the necessary message types, contracts,
queues, and services are set up). However, at this stage, if we tried, no messages
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own using managed code and optionally a COM wrapper API.
As an application developer, you must dene the following:
Incoming events that may provide the fodder for your notications What
types of notications your users will be
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With an event-driven notication pattern, events are written into event tables
on a fairly continuous basis, as congured by the application ad-ministrator.
Every so often the SQLNS generator wakes up and looks for batches of
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Any Functionality at Any Tier
The most interesting thing (and scary, for those of us who want homogeneous, cut-and-paste solutions) is that this functionality can be split across
any tier. There are almost too many choices. Using
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Some of the more interesting options are as follows.
SERVICE_NAMEThe name of the service this route points to.
The name is case sensitive and collation independent. Notice that
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developed and used. Examples of custom protocols are p
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In addition to writing the notications to the notications table, the notication function
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DeliveryChannelNameThe name of the delivery channel used by the
DeviceAddressThe address of the device
DeviceNameThe name of the dev
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4. Grant the user CONNECTrights in the local database and SENDrights on
The need for the user is because in full security, operations in the re-mote
database run as that particular user. For this purpose, REMOTESERV
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Event Stored Procedures
These are the stored procedures that have been created to write events to
NSBeginEventBatch<EventClassName>Creates a new event batch and
returns an ID for the batch.
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changes of stock prices. The events can come from a variety of sources:
The rest of this chapter consists of a series of tutorials that show develop-ing
a sample Notication Services application step by step. We be
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There is a new management interface for NSControloperations in
SQLServer Management Studio.
The application-dependent Notify()function has been replaced with
SQLINSERTINTO.SELECTsyntax to improve security.
There is 64-bit s
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The difference between these three types is the level of trust between the
initiator and the target of the dialog and what user the connection on each
side runs as.
In full secur
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Create a stored procedure in the broker/trader database that functions as the
service program for messages on the tradeAckQueue. You can see an
example of this in Listing 15-19. Note that you need to add some code to
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Application Definition File
The ADF stores all metadata about a particular SQLNS application. The le
ApplicationDefinitionFileSchema.xsdschema. Also, the nodes and elements in
the le must be pr
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feeds, changes of rows in database tables, news feeds, le directory
changes, and so on. Event
Items of subscriber information used to personalize
3. Decide how events cause notications:
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16. Notification Services
SERVICES is another example of how SQL Server becomes a
more visible part of a multitier service-based application architecture. This
chapter is a brief introduction to Notication Services
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required that the master dat