PostgreSQL 8 for Windows
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as CREATE, ALTER, and DROP, mod to log data definition SQL statements and data modification SQL statements such as INSERT, UPDATE, DELETE, and TRUNCATE, and all, which logs all SQL statements
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log_hostname = off
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This feature allows you to record the hostname of all client connections in the system log file
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Runtime Statistics Section
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The Runtime Statistics section allows you to configure PostgreSQL to log database performance statistics These features allow you to view internal PostgreSQL statistics These features are discussed in more detail in 10
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log_parser_stats = off log_planner_stats = off log_executor_stats = off log_statement_stats = off stats_start_collector = on stats_command_string = off stats_block_level = off stats_row_level = on stats_reset_on_server_start = off
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Autovacuum Parameters Section
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In a DBMS, deleted records are not really removed from the database at the time you execute a delete command Instead, deleted records are just marked for deletion and kept in the database This feature enables you to restore any deleted records if you (or your customers) change your mind The downside to this feature is that deleted records take up space in the database Depending on the amount of updates and deletes performed on data, over time this extra space can add up and have a negative impact on database performance To accommodate this problem, PostgreSQL allows you to remove database records marked for deletion This process is called vacuuming Besides manually vacuuming a database, you can allow PostgreSQL to automatically vacuum the database at preset times The autovacuum feature in PostgreSQL is controlled by this section
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autovacuum = on
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This value enables or disables (off) the database autovacuum feature within PostgreSQL
autovacuum_naptime = 60
The PostgreSQL Files and Programs
This value sets the amount of time (in seconds) that PostgreSQL will run the autovacuum feature
autovacuum_vacuum_threshold = 1000 autovacuum_analyze_threshold = 500 autovacuum_vacuum_scale_factor = 04 autovacuum_analyze_scale_factor = 02 autovacuum_vacuum_cost_delay = -1 autovacuum_vacuum_cost_limit = -1
Once the autovacuum feature is enabled, these features control when tables are autovacuumed, based on the number of transactions (vacuum threshold), or when tables are analyzed, based on the number of transactions (analyze threshold) If any of these parameters are met before the configured autovacuum_naptime value, the autovacuum is performed
Client Connection Defaults Section
This section allows you to specify special parameters for how data is handled in client connections
search_path = '$user,public'
Defines the default order in which database schemas (described in 4) are searched when an object is referenced without a schema By default, the user s own schema is searched first, followed by the public schema
default_tablespace = ''
This value specifies the default tablespace (described in 4) where PostgreSQL creates objects The default value is for PostgreSQL to use the tablespace where the database is located
check_function_bodies = on
This value instructs PostgreSQL to check new functions as they are created by users to ensure the functions will work within the database tables
default_transaction_isolation = 'read committed'
This value defines the default isolation level used by PostgreSQL for transactions (described in 7)
default_transaction_read_only = off
This value, when enabled, prevents transactions from altering tables
statement_timeout = 0
PostgreSQL 8 for Windows
This value provides the time, in milliseconds, that PostgreSQL allows an SQL statement to run The default value of 0 disables this feature, which allows SQL statements to take as long as they need to process The next group of features defines how times, dates, and characters are formatted within PostgreSQL
datestyle = 'iso, mdy'
This value specifies the format used to display dates The default value displays dates using the ISO format, using the month/day/year style Other styles available are DMY and YMD
timezone = unknown
This value sets the default time zone for displaying times The default of unknown forces PostgreSQL to use the system settings
australian_timezones = off
When enabled, PostgreSQL interprets the ACST, CST, EST, and SAT time zones as Australian instead of North American
extra_float_digits = 0
This value specifies the number of extra digits displayed for floating-point numbers
client_encoding = sql_ascii
This value specifies the client-side data encoding method used by the PostgreSQL client The default value is the database encoding
lc_messages = 'C' lc_monetary = 'C' lc_numeric = 'C' lc_time = 'C'
These features set the language locale used for messages, money values, number formatting, and time formatting The default is set in the PostgreSQL installer program (see 2) The C value formats all values using the ISO C format, which assumes that the local operating system controls language formatting