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Even when you connect to an instance running on your local machine, you still use Oracle Net All Oracle sessions use a network protocol to implement the separation of user code from server code, but for a local connection the protocol is IPC: this is the protocol provided by your operating system that will allow processes to communicate within the host machine This is the only type of connection that does not require a database listener; indeed, local connections do not require any configuration at all The only information needed is to tell your user process which instance you want to connect to Remember that there could be several instances running on your local computer You give the process this information through an environment variable Figure 4-2 shows examples of this on Linux, and Figure 4-3 shows how to connect to a local database on Windows

use Fcntl; open(DATA,"ls|") or die "Couldn't open pipe, $!"; if ((fcntl(DATA,&F_GETFL,0) & O_NONBLOCK) != O_NONBLOCK) { die "Can't set non-blocking status" unless fcntl(DATA,&F_SETFL,(fcntl(DATA,&F_GETFL,0) & ~O_NONBLOCK)); } else { die "Couldn't get non-blocking status"; }

Remember that the only difference between platforms is the syntax for setting environment variables, as demonstrated in Figures 4-2 and 4-3

7:

To help prevent collisions between namespaces and classes provided by different companies, you should name namespaces using the CompanyName.TechnologyName convention. For example, the full name of a class to control an X-ray laser would be something like this: AppliedEnergy.XRayLaser.Controller

This method is called when the tie function is used to associate an array It is the constructor for the array object and, as such, accepts the class name and should return an object reference The method can also accept additional arguments, used as required See the TIESCALAR method in the Tying Scalars section earlier

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When connecting using Oracle Net, the first stage is to work out exactly what it is you want to connect to This is the process of name resolution If your connect statement includes the connect string @orcl11g , Oracle Net has to work out what is meant by orcl11g This means that the string has to be resolved into certain pieces of information: the protocol you want to use (assume that this is TCP), the IP address on which the database listener is running, the port that the listener is monitoring for incoming connection requests, and the name of the instance (which need not be the same as the connect string) to which you wish to connect There are variations: rather than an IP address, the connect string can include a hostname, which then gets further resolved to an IP address by a DNS server Rather than specifying an instance by name, the connect string can include the name of a service, which (in a RAC environment) could be made up of a number of instances In a single-instance environment, services can

This method will be called each time an array element is accessed The INDEX argument is the element number within the array that should be returned

Figure 4-3

10:

This method is called each time an array element is assigned a value The INDEX argument specifies the element within the array that should be assigned, and VALUE is the corresponding value to be assigned

still be used perhaps to assist with tracking the workload imposed on the database by different groups of users You can configure a number of ways of resolving connect strings to address and instance names, but one way or another the name resolution process gives your user process enough information to go across the network to a database listener and request a connection to a particular instance PART I

Hashes are the obvious (and most complete) of the supported tie implementations This is because the tie system was developed to provide more convenient access to DBM files, which themselves operate just like hashes

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