DATABASE CLUSTER DIRECTORY in .NET framework

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There is a wide assortment of files and directories that are stored in the database cluster directory Table 3-2 describes the directories located in the database cluster directory
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The PostgreSQL Files and Programs
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Directory bin data doc include jdbc lib npgsql PgAdmin III share
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Description The PostgreSQL main programs, utilities, and library files PostgreSQL Data Dictionary, log files, and the transaction log Documentation on contrib modules, PgOleDb, and psqlODBC C program header files for developing C programs for PostgreSQL (if the Development package was installed) Java JDBC library files for developing Java programs for PostgreSQL (if the JDBC package was installed) PostgreSQL library files for the executable programs Microsoft NET library files for developing NET programs for PostgreSQL (if the npgsql package was installed) The pgAdmin III program documentation Contrib modules and timezone information for PostgreSQL
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Table 3-1 PostgreSQL Directories
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Directory base global pg_clog pg_log pg_multixact pg_subtrans pg_tblspc pg_twophase pg_xlog
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Description Contains a directory for each database Contains system tables for the Data Dictionary Contains status files on transaction commits Contains PostgreSQL system log files Contains multitransaction status information used for row locking Contains subtransaction status information Contains links to database tables Contains phase files for the two-phase transaction commit process Contains the transaction log files
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Table 3-2 The PostgreSQL Database Cluster Directories
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PostgreSQL 8 for Windows
The base directory contains subdirectories for each database created on the PostgreSQL system (creating databases is described in 4) PostgreSQL names the directory after the object ID (OID) assigned to the database in the PostgreSQL Data Dictionary As a normal PostgreSQL user, you will not have to worry about these files, because PostgreSQL takes care of them behind the scenes As a PostgreSQL administrator, one area you should become familiar with is the pg_log directory This is the place where the PostgreSQL system maintains system log files These log files track events that occur in the database using text messages stored in the log file As the administrator, it is your job to watch these log files for any problems that appear Each time the PostgreSQL system is started, a new log file is created The default format of the log filename is
postgresl-year-month-day-timelog
You can change the filename format using features in the postgresqlconf file (discussed in The postgresqlconf File section later in this chapter) Each major event that happens in the PostgreSQL system is logged in the system log file The default format shows a timestamp and the event that occurred Some sample entries from a log file are given here:
2006-06-29 20:13:45 FATAL: database "test" does not exist 2006-06-29 20:24:01 LOG: transaction ID wrap limit is 2147484148, limited by database "postgres" 2006-06-29 20:25:05 LOG: autovacuum: processing database "Test" 2006-06-29 20:26:05 LOG: autovacuum: processing database "template1" 2006-06-29 20:27:05 LOG: autovacuum: processing database "postgres" 2006-06-29 20:28:18 NOTICE: ALTER TABLE / ADD PRIMARY KEY will create implicit index "ItemID" for table "test" 2006-06-29 20:28:46 ERROR: syntax error at or near "connect" at character 1 2006-06-29 20:30:35 LOG: autovacuum: processing database "postgres" 2006-06-29 20:31:35 LOG: autovacuum: processing database "Test" 2006-06-29 20:32:35 LOG: autovacuum: processing database "template1" 2006-06-29 20:33:18 ERROR: duplicate key violates unique constraint "ItemID" 2006-06-29 20:33:52 ERROR: column "itemid" does not exist 2006-06-29 20:34:34 LOG: autovacuum: processing database "postgres" 2006-06-29 20:35:34 LOG: autovacuum: processing database "Test" 2006-06-29 20:35:40 ERROR: syntax error at or near "1" at character 36
You can change the format of the log file entries (this is also discussed in The postgresqlconf File section) You may notice that after the timestamp on each line is a keyword, which describes the severity of the event, followed by a short description of the event There are a few different levels of information logged in the system log file, each one signified by a special keyword Table 3-3 describes the different information levels stored in the log in order of severity
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