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Another alternative is to use a separate file with a lck or similar extension and check for that during execution This only works if all processes are aware of the method of locking you are using Both flock and fcntl have the advantage that they are operating system functions, so the information and locks are shared across the whole operating system In theory this means that a C program that uses file locking will also be aware of the locks imposed by a Perl script It also means that all the operating system commands will also be aware of the locks imposed on different files Of course, the exact system you use will often rely on the supported options for the platform you are using; fcntl is the most supported cross-platform solution

The Easy Connect name resolution method was introduced with release 10g It is very easy to use it requires no configuration at all But it is limited to one protocol: TCP The other name resolution methods can use any of the other supported protocols, such as TCP with secure sockets, or Named Pipes Another limitation is that Easy Connect cannot be used with any of Oracle Net s more advanced capabilities, such as load balancing or connect-time failover across different network routes It is fair to say that Easy Connect is a method you as the DBA will find very handy to use, but that it is not a method of much use for your end users Easy Connect is enabled by default You invoke it with connect string syntax such as

8

$result = 3+4; $ftoc = (212-32)*(5/9); $square = 16*2;

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In this example, SQL*Plus will use TCP to go to port 1522 on the IP address to which the hostname resolves Then if there is a listener running on that port and address, it will ask the listener to spawn a server process against an instance that is part of the service called ocp11g Easy Connect can be made even easier:

Beyond these basic operators, Perl also supports a number of functions that fill in the gaps Without exception, all of these functions automatically use the value of $_ if you fail to specify a variable on which to operate

This syntax will also work, but only if the listener running on this hostname is using port 1521, and the service name registered with the listener is jwlnx1bplccoza, the same as the computer name

When you are concerned only with magnitude for example, when comparing the size of two objects the designation of negative or positive is not required You can use the abs function to return the absolute value of a number:

CHAPTER 38 DEEPER INTO C#

print abs(-1295476);

With local naming the user supplies an alias, known as an Oracle Net service alias, for the connect string, and the alias is resolved by a local file into the full network address (protocol, address, port, and service or instance name) This local file is the infamous tnsnamesora file, which has caused DBAs much grief over the years Consider this example of a tnsnamesora file:

The core numerical ability of Perl is supported through the standard operators that you should be familiar with For example, all of the following expressions return the sort of values you would expect:

ocp11g = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = jwlnx1bplccoza)(PORT = 1522)) ) (CONNECT_DATA = (service_name = ocp11g) ) ) test = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = serv2bplccoza)(PORT = 1521)) ) (CONNECT_DATA =

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