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-.\" This is -*-nroff-*-
-.\" XXX standard disclaimer belongs here....
-.\" $Header: /cvsroot/pgsql/src/man/Attic/postgres.1,v 1.16 1999/05/22 17:47:47 tgl Exp $
-.TH POSTGRESQL UNIX 05/19/99 PostgreSQL PostgreSQL
-.SH NAME
-postgres - the Postgres backend server
-.SH SYNOPSIS
-.BR "postgres"
-[\c
-.BR "-B"
-n_buffers]
-[\c
-.BR "-C"
-]
-[\c
-.BR "-D"
-data_directory]
-[\c
-.BR "-E"
-]
-[\c
-.BR "-F"
-]
-[\c
-.BR "-O"
-]
-[\c
-.BR "-Q"
-]
-[\c
-.BR "-S kbytes"
-]
-[\c
-.BR "-d"
-debug_level]
-[\c
-.BR "-e"
-]
-[\c
-.BR "-o"
-output_file]
-[\c
-.BR "-s"
-]
-[\c
-.BR "-v protocol"
-]
-[dbname]
-.in -5n
-.SH DESCRIPTION
-The Postgres backend server can be executed directly from the user shell.
-This should be done only while debugging by the DBA, and should not be
-done while other Postgres backends are being managed by a
-.IR postmaster
-on this set of databases.
-.PP
-Some of the switches explained in this man page can be passed to the backend
-through the "database options" field of a connection request, and thus can be
-set for a particular backend without going to the trouble of restarting the
-postmaster.  This is particularly handy for debugging-related switches.
-.PP
-The optional argument
-.IR dbname
-specifies the name of the database to be accessed.
-.IR Dbname
-defaults to the value of the
-.SM USER
-environment variable.
-.PP
-The 
-.IR postgres
-server understands the following command-line options:
-.TP
-.BR "-B" " n_buffers"
-If the backend is running under the 
-.IR postmaster ,
-.IR "n_buffers"
-is the number of shared-memory buffers that the
-.IR "postmaster"
-has allocated for the backend server processes that it starts.  If the
-backend is running standalone, this specifies the number of buffers to
-allocate.  This value defaults to 64 buffers, where each buffer is 8k bytes
-(or whatever BLCKSZ is set to in config.h).
-.TP
-.BR "-C"
-Do not show server version number.
-.TP
-.BR "-D" " data_directory"
-This option specifies the pathname of the directory that contains the
-database system data (the tables, the catalogs, etc.).  If you don't 
-specify this option, Postgres uses the value of the PGDATA environment
-variable.  You must either specify a -D option or set PGDATA.
- 
-The data directory pathname for a database system is normally determined when
-the database system is created with
-.IR initdb ,
-with a --pgdata option to
-.IR initdb .
-.TP
-.BR "-E"
-Echo all queries.
-.TP
-.BR "-F"
-Disable automatic fsync() call after each transaction.
-This option improves performance, but an operating system crash
-while a transaction is in progress will probably cause data loss.
-.TP
-.BR "-O"
-Override restrictions, so system table structures can be modified(pg_*).
-.TP
-.BR "-Q"
-Specifies \*(lqquiet\*(rq mode.
-.TP
-.BR "-S" " kbytes"
-Specifies the amount of memory to be used by internal sorts and hashes
-before resorting to temporary disk files.  The value is specified in
-kilobytes, and defaults to 512 kilobytes.  Note that for a complex query,
-several sorts and/or hashes might be running in parallel, and each one
-will be allowed to use as much as -S kilobytes before it starts to put
-data into temporary files.
-.TP
-.BR "-e"
-The
-.IR "-e"
-option controls how dates are input to and output from the database.
-.IP
-If the
-.IR "-e"
-option is supplied, then all dates passed to and from the frontend
-processes will be assumed to be in
-.IR "European"
-format ie.
-.IR "DD-MM-YYYY"
-otherwise dates are input and output in
-.IR "American"
-format ie.
-.IR "MM-DD-YYYY"
-.TP
-.BR "-d" " debug_level"
-Turns on debugging at the numeric level
-.IR "debug_level" .
-Turning on debugging will cause query, parse trees, and query plans to
-be displayed.
-.TP
-.BR "-o" " output_file"
-Sends all debugging and error output to 
-.IR output_file .
-If the backend is running under the 
-.IR postmaster ,
-error messages are still sent to the frontend process as well as to
-.IR output_file ,
-but debugging output is sent to the controlling tty of the
-.IR postmaster
-(since only one file descriptor can be sent to an actual file).
-.TP
-.BR "-s"
-Print time information and other statistics at the end of each query.
-This is useful for benchmarking or for use in tuning the number of
-buffers.
-.TP
-.BR "-v" " protocol"
-Specifies the number of the frontend/backend protocol to be used for this
-particular session.
-.SH "DEVELOPER COMMAND OPTIONS"
-There are several other options that may be specified, used mainly
-for debugging purposes.  These are listed here only for the use by
-Postgres system developers.
-.BR "Use of any of these options is highly discouraged" .
-Furthermore, any of these options may disappear or change at any time.
-.TP
-.BR "-A" "n|r|b|Q\fIn\fP|X\fIn\fP"
-.IP
-This option generates a tremendous amount of output.
-.TP
-.BR "-L"
-Turns off the locking system.
-.TP
-.BR "-N"
-Disables use of newline as a query delimiter.
-.TP
-.BR "-f"
-Forbids the use of particular scan and join methods:
-.IR s " and " i
-disable sequential and index scans respectively, while
-.IR n ", " m " and " h
-disable nested-loop, merge and hash joins respectively.
-(Neither sequential scans nor nested-loop joins can be disabled completely;
-the -fs and -fn options simply discourage the optimizer from using those
-plan types if it has any other alternative.)
-.TP
-.BR "-i"
-Prevents query execution, but shows the plan tree.
-.TP
-.BR "-p" " databasename"
-Indicates to the backend server that it has been started by a 
-.IR postmaster
-and make different assumptions about buffer pool management, file
-descriptors, etc.  Switches following -p are restricted to those
-considered "secure".
-.TP
-.BR "-t" "pa[rser]|pl[anner]|e[xecutor]"
-Print timing statistics for each query relating to each of the major
-system modules.  This option cannot be used with
-.BR "-s" .
-.SH "SEE ALSO"
-ipcclean(1),
-psql(1), 
-postmaster(1).
-.SH "DIAGNOSTICS"
-Of the nigh-infinite number of error messages you may see when you
-execute the backend server directly, the most common will probably be:
-.TP
-.BR "semget: No space left on device"
-If you see this message, you should run the
-.IR ipcclean
-command.  After doing this, try starting
-.IR postgres
-again.  If this still doesn't work, you probably need to configure
-your kernel for shared memory and semaphores as described in the
-installation notes.