.net barcode reader sdk The postgresqlconf File in .NET

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The postgresqlconf File
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The postgresqlconf file is the main configuration file for PostgreSQL It controls how each of the features of PostgreSQL behaves on your system The configuration file consists of records that define each PostgreSQL feature The format of a feature record is
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featurename = value
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While this is the formal definition of a feature record, in reality, the equal sign (=) is optional As long as the value item is separated from the featurename item using white space (either one or more spaces or tabs), PostgreSQL will understand what you mean Comments are preceded by a pound sign (#), which can be either at the start of a line to comment the entire line, or after a valid feature definition to add a comment to a feature line
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The PostgreSQL Files and Programs
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When you view the postgresconf file, you will see that there are lots of feature entries that are commented out When a feature is commented out from the configuration file, PostgreSQL assumes the default value for the feature The configuration file shows the default value within the commented line In the sample postgresqlconf file created by the PostgreSQL installer, similar features are grouped together into sections, but this is not a requirement Feature records can be placed anywhere in the configuration file You can view and modify the contents of the postgresqlconf file by choosing Start | Programs | PostgreSQL 82 | Configuration Files | Edit postgresqlconf The configuration file contains entries for all of the features available to modify, along with their default values The following sections describe the different configuration file sections and the features that can be modified In each section, the feature entries are shown with their default values, followed by a description of what the feature is used for
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The first section in the postgresqlconf configuration file is the File Locations section This section contains features that define where the Data Dictionary and other PostgreSQL configuration files are located
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data_directory = 'ConfigDir'
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The data_directory feature value is somewhat misleading On the surface, it appears to point to the location where the PostgreSQL data directory is located However, the location of the database cluster directory that PostgreSQL uses is specified on the command line when the PostgreSQL system starts This location is automatically placed in the ConfigDir variable when the PostgreSQL system starts, which is then used in the configuration file You cannot just enter the location of the data directory in this feature value and expect PostgreSQL to be able to find the file to read it
hba_file = 'ConfigDir/pg_hbaconf'
This feature is used to reference the location of the pg_hbaconf configuration file By default, it is located in the database cluster directory You can elect to move the file to an alternative location on your system
ident_file = 'ConfigDir/pg_identconf'
Similarly, this feature allows you to relocate the pg_identconf configuration file
external_pid_file = '(none)'
By default, PostgreSQL maintains a file that contains the system process ID (PID) of the currently running PostgreSQL system This file is used by PostgreSQL utilities to track the current PostgreSQL running process You can define an additional copy of that file by using the external_pid_file feature The default location is always kept for internal PostgreSQL use
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Connections and Authentication Section
The Connections and Authentication section contains several features that define how the PostgreSQL system interacts with clients across the network The first group contains features that handle how the PostgreSQL system allows remote clients to connect to the server:
listen_addresses = 'localhost'
The listen_addresses option defines what network interfaces PostgreSQL will accept connections on The keyword localhost specifies that PostgreSQL will accept connections only from applications running on the same system as the server If you checked the Listen on All Addresses box during the installation, you will see an asterisk (*) value here This specifies that PostgreSQL will accept connections from all network interfaces on the system You can also specify individual network connections by their IP addresses If there is more than one network interface on the system, you can determine which network interfaces PostgreSQL will accept connections on by placing their IP addresses in a comma-separated list
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