Provided by: pgbouncer_1.3-1_i386 bug


       pgbouncer - Lightweight connection pooler for PostgreSQL.


       db = ...



       Config file is in "ini" format. Section names are between " and ".
       Lines starting with ";" or "" are taken as comment and ignored. The
       characters ";" and "" are not recognized when they appear later in the


   Generic settings
           Specifies log file. Log file is kept open so after rotation kill
           -HUP or on console RELOAD; should be done. Note: The windows
           environment by a stop and start with a service property.

           Default: not set.

           Specifies pid file. Without pidfile, the daemonization is not

           Default: not set.

           Specifies IPv4 address, where to listen for TCP connections. Or *
           meaning "listen on all addresses". When not set, only unix socket
           connections are allowed.

           Default: not set

           On which port to listen on. Applies to both TCP and Unix sockets.

           Default: 6432

           Specifies location for Unix sockets. Applies to both listening
           socket and server connections. If set to empty string, Unix sockets
           are disabled. Note: Did not support in the windows environment.

           Default: /tmp

           If set, specifies UNIX user to change to. Work only if started as
           root or user is same as current user. Note: Did not support in the
           windows environment.

           Default: not set

           Load user names and passwords from this file. File format used is
           same as for PostgreSQL pg_auth/pg_pwd file, so can be pointed
           directly to backend file.

           Default: not set.

           How to authenticate users.

               Use MD5-based password check.  auth_file may contain both
               md5-encrypted or plain-text passwords. Default.

               Use crypt(3) based bassword check.  auth_file must contain
               plain-text passwords.

               Clear-text password is sent over wire.

               No authentication is done. Username must still exists in

               Like trust but username given is ignored. Requires that all
               databases have configured to log in as specific user.

           Specifies when server connection is tagged as reusable for other

               Server is released back to pool after client disconnects.

               Server is released back to pool after transaction finishes.

               Server is released back to pool after query finishes. Long
               transactions spanning multiple statements are disallowed in
               this mode.

           Maximum number of client connections allowed. When increased then
           the file descriptor limits should also be increased. Note that
           actual number of file descriptiors used is more that
           max_client_conn. Theoretical maximum used is:

               max_client_conn + (max_pool_size * total_databases * total_users)

           if each user connects under it’s own username to server. If
           database user is specified in connect string (all users connect
           under same username), the theoretical maximum is:

               max_client_conn + (max_pool_size * total_databases)

           The theoretical maximum should be never reached, unless somebody
           deliberately crafts special load for it. Still, it means you should
           give fds liberately.

           Search for ulimit in your favourite shell man page. Note: ulimit
           can’t be held in the windows environment for now.

           Default: 100

           How many server connection to allow per user/database pair. Can be
           overrided in per-database config.

           Default: 20

           How many additional connections to allow to a pool.

           How many server connection to allow per user/database pair. Can be
           overrided in per-database config. 0 disables.

           Default: 0 (disabled)

           If a client has not been services in this many seconds, pgbouncer
           enables use of additional connections from reserve pool. 0

           Default: 5

           By default, pgbouncer reuses server connections in LIFO manner, so
           that few connections get the most load. This gives best performance
           if you have single server serving a database. But if there is TCP
           round-robin behind a database IP then it’s better if pgbouncer also
           uses connections in that manner, thus achieving uniform load.

           Default: 0

           By default, PgBouncer allows only parameters it can keep track of
           in startup packets - client_encoding, datestyle, timezone and

           All others raise error. To allow others too, they can be specified
           here, so that pgbouncer knows that they are handled by admin and it
           can ignore them.

           Default: empty

   Log settings
           Toggles syslog on/off As for windows environment, eventlog is used
           for substitution.

           Default: 0

           Under what facility to send log to syslog. Possibilities: auth,
           authpriv, daemon, user, local0-7

           Default: daemon

           Log successful logins.

           Default: 1

           Log disconnections with reasons.

           Default: 1

           Log error messaged pooler sends to clients.

           Default: 1

   Console access control
           Comma-separted list of database users that are allowed to connect
           and run all commands on console.

           Default: empty

           Comma-separated list of database users that are allowed to connect
           and run read-only queries on console. Thats means all SHOW commands
           except SHOW FDS.

           Default: empty.

   Connection sanity checks, timeouts
           Query send to server on connection release, before making it
           available to other clients. At that moment no transaction is in
           progress so it should not include ABORT or ROLLBACK.

           Good choice for 8.2 and below is:

               server_reset_query = RESET ALL; SET SESSION AUTHORIZATION DEFAULT;

           for 8.3 and above its enough to do:

               server_reset_query = DISCARD ALL;

           How long to keep released immidiately available, without running
           sanity-check query on it. If 0 then the query is ran always.

           Default: 30

           Simple do-nothing query to check if server connection is alive.

           If empty string, then sanity checking is disabled.

           Default: SELECT 1;

           Pooler tries to close server connections that are been connected
           longer than this. Setting it to 0 means the connection is to be
           used only once, then closed.

           Default: 3600

           If server connection has been idle more than this then there’s too
           many connections in the pool and this one can be dropped.

           Default: 600

           If connection and login wont finish in this time, the connection
           will be closed.

           Default: 15

           If login failed, because of failure from connect() or
           authentication that pooler waits this much before retrying to

           Default: 15

           If client connect but does not manage to login in this time, it
           will be disconnected. Mainly needed to avoid dead connections
           stalling SUSPEND and thus online restart.

           Default: 60

           If the automatically created (vie "*") database pools have been
           unused this many seconds, they are freed. The negative aspect of
           that is that their statistics is also forgotten.

           Default: 3600

   Dangerous timeouts
       Setting following timeouts cause unexpected errors.

           Queries running longer than that are canceled. This should be used
           only with slightly smaller server-side statement_timeout, to apply
           only for network problems. [seconds]

           Default: 0 (disabled)

           Client connections idling longer than that are closed. This should
           be larger then client-side connection lifetime settings, to apply
           only for network problems. [seconds]

           Default: 0 (disabled)

   Low-level network settings
           Internal buffer size for packets. Affects size of TCP packets sent
           and general memory usage. Actual libpq packets can be larger than
           this so no need to set it large.

           Default: 2048

           How many times to process data on one connection, before
           proceeding. Without limit, one connection with big resultset can
           stall pgbouncer for a long time. One loop processes one pkt_buf
           amount of data. 0 means no limit.

           Default: 5

           Details about following options should be looked from man 7 tcp.

           Default: 45 on Linux, otherwise 0

           Default: not set

           Default: not set

           Default: not set

           Default: not set

           Default: not set


       This contains key=value pairs where key will be taken as database name
       and value as libpq-connstring style list of key=value pairs. As actual
       libpq is not used, so not all features from libpq can be used
       (service=, quoting).

       Database name can contain characters [0-9A-Za-z_.-] without quoting.
       Names that contain other chars need to be quoted with standard SQL
       ident quoting: double quotes where "" is taken as single quote.

       "\*" acts as fallback database: if the exact name does not exist, it’s
       value is taken as connect string for requested database. Such
       automatically created database entries are cleaned up if they stay idle
       longer then the time specified in autodb_idle_timeout parameter.

   Location parameters
           Destination database name.

           Default: same as client-side database name.

           IP-address to connect to.

           Default: not set, meaning to use unix-socket.

           Default: 5432

       user, password
           If user= is set, all connections to destination database will be
           done with that user, meaning that there will be only one pool for
           this database.

           Otherwise pgbouncer tries to log into destination database with
           client username, meaning that there will be one pool per user.

   Pool configuration
           Set maximum size of pools for this database. If not set, the
           default_pool_size is used.

           Query to be executed after connecttion is established, but before
           taking the connection into use by clients. If the query raises
           errors, they are logged but ignored otherwise.

   Extra parameters
       They allow setting default parameters on server connection.

       Note that since version 1.1 PgBouncer tracks client changes for their
       values, so their use in pgbouncer.ini is deprecated now.

           Ask specific client_encoding from server.

           Ask specific datestyle from server.

           Ask specific timezone from server.


       PgBouncer needs its own user database. The users are loaded from text
       file that should be in same format as PostgreSQL’s pg_auth/pg_pwd file.

           "username1" "password" ...
           "username2" "md5abcdef012342345" ...

       There shoud be at least 2 fields, surrounded by double quotes. First is
       username and second either plain-text or md5-hashed password. PgBouncer
       ignores rest of the line.

       Such file format allows to direct PgBouncer directly to PostgreSQL user
       file under data directory.


   Minimal config
           template1 = host= dbname=template1

           pool_mode = session
           listen_port = 6543
           listen_addr =
           auth_type = md5
           auth_file = users.txt
           logfile = pgbouncer.log
           pidfile =
           admin_users = someuser
           stats_users = stat_collector

   Database defaults

           ; foodb over unix socket
           foodb =

           ; redirect bardb to bazdb on localhost
           bardb = host= dbname=bazdb

           ; acceess to dest database will go with single user
           forcedb = host= port=300 user=baz password=foo client_encoding=UNICODE datestyle=ISO


       pgbouncer(1) - manpage for general usage, console commands.

[FIXME: source]                   05/05/2009                      PGBOUNCER(5)