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the object in memory on the client. All the other channel proxies use network communication to interact with the server-side object.

other technology and the statement will remain true This is a fact: it is easier to write applications that perform poorly than it is to write applications that perform well If you don t know what you re doing, you may find that you ve managed to build a single-user system in the world s most scalable database! The database is a tool, and the improper use of any tool can lead to disaster Would you use a nutcracker as if it were a hammer to smash walnuts You could, but it would not be a proper use of that tool, and the result would be messy (and probably involve some seriously damaged fingers) Similar effects can be achieved by remaining ignorant of your database For example, I was called into a project recently The developers were experiencing massive performance issues it seemed that their system was serializing many transactions.

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The data portal will also allow you to create your own proxy/host combination so you can support network channels other than the three implemented in this chapter.

namespace I2CTemperatureSensorSample { /// <summary> /// Managed driver for the TMP100 temperature sensor chip /// from Texas Instruments on the I2C bus. /// </summary> public class TMP100Sensor { #region constants private const byte clockRateKHz = 59; private const byte REGISTER_Control = 0x01; //command to configure sensor private const byte REGISTER_Temperature = 0x00; //command to request result private const byte CONTROL_EnergyModeShutdown = 0x01; private const byte CONTROL_DataLengthTwelveBits = 0x60; private const byte CONTROL_OneShot = 0x80; //ms The maximum time needed by the sensor to convert 12 bits private const int conversionTime = 600; private const int transactionTimeout = 1000; //ms #endregion private readonly byte address; private readonly I2CDevice device; public TMP100Sensor(byte address) { this.address = address; I2CDevice.Configuration config = new I2CDevice.Configuration(address, clockRateKHz); this.device = new I2CDevice(config); } public float Temperature() { //write to one shot bit in control register to trigger measurement, //that means telling the sensor to capture the data.

Instead of many people working concurrently, everyone was getting into a really long line and waiting for those in front of them to complete before they could proceed The application architects walked me through the architecture of their system the classic three-tier approach They would have a web browser talk to a middle-tier application server running JavaServer Pages (JSP) The JSPs would in turn use another layer, Enterprise JavaBeans (EJB), that did all of the SQL The SQL in the EJBs was generated by some third-party tool and was done in a database-independent fashion Now, in this system it was very hard to diagnose anything, because none of the code was instrumented or traceable.

Table 4-1 lists the types required to implement the channel adapter portion of the data portal. Table 4-1. Types Required for the Channel Adapter

Instrumenting code is the fine art of making every other line of developed code be debug code, something that allows you to trace the execution of your application so that when you are faced with performance, capacity, or even logic issues, you can track down exactly where the problem is In this case, we could only say for sure that the problem was somewhere in between the browser and the database In other words, the entire system was suspect Fortunately, the Oracle database is heavily instrumented, but unfortunately, the application needs to be able to turn the instrumentation on and off at appropriate points an ability that this application did not have So, we were faced with trying to diagnose a performance issue with not too many details, just what we could glean from the database itself Normally, an application-level trace would be preferred for investigating an application performance issue.

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