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DISCARD(7)              PostgreSQL 14.23 Documentation              DISCARD(7)

NAME
       DISCARD - discard session state

SYNOPSIS
       DISCARD { ALL | PLANS | SEQUENCES | TEMPORARY | TEMP }

DESCRIPTION
       DISCARD releases internal resources associated with a database session.
       This command is useful for partially or fully resetting the session's
       state. There are several subcommands to release different types of
       resources; the DISCARD ALL variant subsumes all the others, and also
       resets additional state.

PARAMETERS
       PLANS
           Releases all cached query plans, forcing re-planning to occur the
           next time the associated prepared statement is used.

       SEQUENCES
           Discards all cached sequence-related state, including
           currval()/lastval() information and any preallocated sequence
           values that have not yet been returned by nextval(). (See CREATE
           SEQUENCE (CREATE_SEQUENCE(7)) for a description of preallocated
           sequence values.)

       TEMPORARY or TEMP
           Drops all temporary tables created in the current session.

       ALL
           Releases all temporary resources associated with the current
           session and resets the session to its initial state. Currently,
           this has the same effect as executing the following sequence of
           statements:

               CLOSE ALL;
               SET SESSION AUTHORIZATION DEFAULT;
               RESET ALL;
               DEALLOCATE ALL;
               UNLISTEN *;
               SELECT pg_advisory_unlock_all();
               DISCARD PLANS;
               DISCARD TEMP;
               DISCARD SEQUENCES;

NOTES
       DISCARD ALL cannot be executed inside a transaction block.

COMPATIBILITY
       DISCARD is a PostgreSQL extension.

PostgreSQL 14.23                     2026                           DISCARD(7)
DISCARD(8postfix)                                            DISCARD(8postfix)

NAME
       discard - Postfix discard mail delivery agent

SYNOPSIS
       discard [generic Postfix daemon options]

DESCRIPTION
       The  Postfix discard(8) delivery agent processes delivery requests from
       the queue manager. Each request specifies a queue file,  a  sender  ad-
       dress,  a  next-hop  destination that is treated as the reason for dis-
       carding the mail, and recipient information.  The reason  may  be  pre-
       fixed with an RFC 3463-compatible detail code.  This program expects to
       be run from the master(8) process manager.

       The discard(8) delivery agent pretends to deliver all recipients in the
       delivery  request,  logs  the  "next-hop" destination as the reason for
       discarding the mail, updates the queue file, and either  marks  recipi-
       ents  as  finished or informs the queue manager that delivery should be
       tried again at a later time.

       Delivery status reports are sent to the trace(8) daemon as appropriate.

SECURITY
       The discard(8) mailer is not security-sensitive. It does  not  talk  to
       the network, and can be run chrooted at fixed low privilege.

STANDARDS
       RFC 3463 (Enhanced Status Codes)

DIAGNOSTICS
       Problems and transactions are logged to syslogd(8) or postlogd(8).

       Depending  on the setting of the notify_classes parameter, the postmas-
       ter is notified of bounces and of other trouble.

CONFIGURATION PARAMETERS
       Changes to main.cf are picked up automatically as discard(8)  processes
       run for only a limited amount of time. Use the command "postfix reload"
       to speed up a change.

       The text below provides only a parameter summary. See  postconf(5)  for
       more details including examples.

       config_directory (see 'postconf -d' output)
              The  default  location of the Postfix main.cf and master.cf con-
              figuration files.

       daemon_timeout (18000s)
              How much time a Postfix daemon process may take to handle a  re-
              quest before it is terminated by a built-in watchdog timer.

       delay_logging_resolution_limit (2)
              The  maximal  number of digits after the decimal point when log-
              ging sub-second delay values.

       double_bounce_sender (double-bounce)
              The sender address of postmaster notifications that  are  gener-
              ated by the mail system.

       ipc_timeout (3600s)
              The  time limit for sending or receiving information over an in-
              ternal communication channel.

       max_idle (100s)
              The maximum amount of time that an idle Postfix  daemon  process
              waits for an incoming connection before terminating voluntarily.

       max_use (100)
              The maximal number of incoming connections that a Postfix daemon
              process will service before terminating voluntarily.

       process_id (read-only)
              The process ID of a Postfix command or daemon process.

       process_name (read-only)
              The process name of a Postfix command or daemon process.

       queue_directory (see 'postconf -d' output)
              The location of the Postfix top-level queue directory.

       syslog_facility (mail)
              The syslog facility of Postfix logging.

       syslog_name (see 'postconf -d' output)
              A prefix that  is  prepended  to  the  process  name  in  syslog
              records, so that, for example, "smtpd" becomes "prefix/smtpd".

       Available in Postfix 3.3 and later:

       service_name (read-only)
              The master.cf service name of a Postfix daemon process.

SEE ALSO
       qmgr(8), queue manager
       bounce(8), delivery status reports
       error(8), Postfix error delivery agent
       postconf(5), configuration parameters
       master(5), generic daemon options
       master(8), process manager
       postlogd(8), Postfix logging
       syslogd(8), system logging

LICENSE
       The Secure Mailer license must be distributed with this software.

HISTORY
       This service was introduced with Postfix version 2.2.

AUTHOR(S)
       Victor Duchovni
       Morgan Stanley

       Based on code by:
       Wietse Venema
       IBM T.J. Watson Research
       P.O. Box 704
       Yorktown Heights, NY 10598, USA

       Wietse Venema
       Google, Inc.
       111 8th Avenue
       New York, NY 10011, USA

                                                             DISCARD(8postfix)