The PostgreSQL Files and Programs in Visual Studio .NET

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The PostgreSQL Files and Programs
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Message Severity DEBUG INFO NOTICE WARNING ERROR LOG FATAL PANIC
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Description Program information for developers Information requested by a database user from a database command Information that may be useful to the database user regarding a submitted command Information about possible problems in a user session A minor error that caused a user command to abort Information of interest for the administrator related to the PostgreSQL system A major error that caused a user session to abort A major error that caused the PostgreSQL system to abort
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Table 3-3 PostgreSQL Log Message Levels
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As you can see from the example entries above, there are lots of events that are logged in the log file On a busy system, it does not take long for the log file to get rather large You can configure how PostgreSQL handles system logging using the PostgreSQL configuration file (discussed in the next section) You have lots of options of how to handle log files, such as setting the level at which PostgreSQL logs messages (the NOTICE level is the default), and setting the log file to automatically roll over to a new file if it gets past a preset size This helps you to sift through the log file looking for problems among the normal messages It is always a good idea to keep an eye on the PostgreSQL log files If you let them go on for too long, they will consume the entire available disk space on your system, and cause the PostgreSQL server to stop Most database administrators institute a policy on when to delete old log files, and whether or not to save them before deletion
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CONFIGURATION FILES
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How PostgreSQL behaves on your system is controlled by three separate configuration files While the PostgreSQL install process creates standard configuration file values for the system to operate, knowing how to fine-tune your PostgreSQL configuration values can be a necessity for large installations There are plenty of advanced features that you can turn on or off via the configuration files
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The PostgreSQL configuration files are standard text files, located in the database cluster directory, described earlier Since they are standard text files, you can use the Windows Notepad application to view and modify them On a Windows PostgreSQL installation, there is an easy way for you to edit the configuration files The PostgreSQL menu area on the Windows Start | Programs menu (called PostgreSQL 82 on my installation) contains links to edit each of the three configuration files: postgresqlconf pg_hbaconf pg_identconf All you need to do is click the appropriate link to bring the configuration file up in a standard Windows Notepad session You can change configuration file values at any time while the system is running However, the new changes will not take effect until either the system is restarted or you use the reload feature located on the PostgreSQL menu (or manually use the pg_ctl reload command, discussed later in this chapter) When working with the configuration files, there are a few things to keep in mind Each entry in the configuration files is on a separate line Lines that start with a hash mark (#) are comments and not processed by the PostgreSQL system (a hash mark can be added at the end of an entry to add a comment on the entry line) If a configuration line is commented out, PostgreSQL uses the default value for that entry You can change the default value to another value by removing the comment symbol from the line and reloading or restarting the PostgreSQL system However, if you want to revert to the default value for an entry, you cannot just put the comment symbol back and reload the PostgreSQL system You must stop and restart the PostgreSQL system for the default value to take effect This is a big gotcha for many novice PostgreSQL administrators The following sections describe the entries in the three configuration files and walk through the settings that can be controlled within the configuration files
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