PG_DUMP(1) PostgreSQL 15.7 Documentation PG_DUMP(1)
NAME
pg_dump - extract a PostgreSQL database into a script file or other
archive file
SYNOPSIS
pg_dump [connection-option...] [option...] [dbname]
DESCRIPTION
pg_dump is a utility for backing up a PostgreSQL database. It makes
consistent backups even if the database is being used concurrently.
pg_dump does not block other users accessing the database (readers or
writers).
pg_dump only dumps a single database. To back up an entire cluster, or
to back up global objects that are common to all databases in a cluster
(such as roles and tablespaces), use pg_dumpall(1).
Dumps can be output in script or archive file formats. Script dumps are
plain-text files containing the SQL commands required to reconstruct
the database to the state it was in at the time it was saved. To
restore from such a script, feed it to psql(1). Script files can be
used to reconstruct the database even on other machines and other
architectures; with some modifications, even on other SQL database
products.
The alternative archive file formats must be used with pg_restore(1) to
rebuild the database. They allow pg_restore to be selective about what
is restored, or even to reorder the items prior to being restored. The
archive file formats are designed to be portable across architectures.
When used with one of the archive file formats and combined with
pg_restore, pg_dump provides a flexible archival and transfer
mechanism. pg_dump can be used to backup an entire database, then
pg_restore can be used to examine the archive and/or select which parts
of the database are to be restored. The most flexible output file
formats are the “custom” format (-Fc) and the “directory” format (-Fd).
They allow for selection and reordering of all archived items, support
parallel restoration, and are compressed by default. The “directory”
format is the only format that supports parallel dumps.
While running pg_dump, one should examine the output for any warnings
(printed on standard error), especially in light of the limitations
listed below.
OPTIONS
The following command-line options control the content and format of
the output.
dbname
Specifies the name of the database to be dumped. If this is not
specified, the environment variable PGDATABASE is used. If that is
not set, the user name specified for the connection is used.
-a
--data-only
Dump only the data, not the schema (data definitions). Table data,
large objects, and sequence values are dumped.
This option is similar to, but for historical reasons not identical
to, specifying --section=data.
-b
--blobs
Include large objects in the dump. This is the default behavior
except when --schema, --table, or --schema-only is specified. The
-b switch is therefore only useful to add large objects to dumps
where a specific schema or table has been requested. Note that
blobs are considered data and therefore will be included when
--data-only is used, but not when --schema-only is.
-B
--no-blobs
Exclude large objects in the dump.
When both -b and -B are given, the behavior is to output large
objects, when data is being dumped, see the -b documentation.
-c
--clean
Output commands to DROP all the dumped database objects prior to
outputting the commands for creating them. This option is useful
when the restore is to overwrite an existing database. If any of
the objects do not exist in the destination database, ignorable
error messages will be reported during restore, unless --if-exists
is also specified.
This option is ignored when emitting an archive (non-text) output
file. For the archive formats, you can specify the option when you
call pg_restore.
-C
--create
Begin the output with a command to create the database itself and
reconnect to the created database. (With a script of this form, it
doesn't matter which database in the destination installation you
connect to before running the script.) If --clean is also
specified, the script drops and recreates the target database
before reconnecting to it.
With --create, the output also includes the database's comment if
any, and any configuration variable settings that are specific to
this database, that is, any ALTER DATABASE ... SET ... and ALTER
ROLE ... IN DATABASE ... SET ... commands that mention this
database. Access privileges for the database itself are also
dumped, unless --no-acl is specified.
This option is ignored when emitting an archive (non-text) output
file. For the archive formats, you can specify the option when you
call pg_restore.
-e pattern
--extension=pattern
Dump only extensions matching pattern. When this option is not
specified, all non-system extensions in the target database will be
dumped. Multiple extensions can be selected by writing multiple -e
switches. The pattern parameter is interpreted as a pattern
according to the same rules used by psql's \d commands (see
Patterns), so multiple extensions can also be selected by writing
wildcard characters in the pattern. When using wildcards, be
careful to quote the pattern if needed to prevent the shell from
expanding the wildcards.
Any configuration relation registered by pg_extension_config_dump
is included in the dump if its extension is specified by
--extension.
Note
When -e is specified, pg_dump makes no attempt to dump any
other database objects that the selected extension(s) might
depend upon. Therefore, there is no guarantee that the results
of a specific-extension dump can be successfully restored by
themselves into a clean database.
-E encoding
--encoding=encoding
Create the dump in the specified character set encoding. By
default, the dump is created in the database encoding. (Another way
to get the same result is to set the PGCLIENTENCODING environment
variable to the desired dump encoding.) The supported encodings are
described in Section 24.3.1.
-f file
--file=file
Send output to the specified file. This parameter can be omitted
for file based output formats, in which case the standard output is
used. It must be given for the directory output format however,
where it specifies the target directory instead of a file. In this
case the directory is created by pg_dump and must not exist before.
-F format
--format=format
Selects the format of the output. format can be one of the
following:
p
plain
Output a plain-text SQL script file (the default).
c
custom
Output a custom-format archive suitable for input into
pg_restore. Together with the directory output format, this is
the most flexible output format in that it allows manual
selection and reordering of archived items during restore. This
format is also compressed by default.
d
directory
Output a directory-format archive suitable for input into
pg_restore. This will create a directory with one file for each
table and blob being dumped, plus a so-called Table of Contents
file describing the dumped objects in a machine-readable format
that pg_restore can read. A directory format archive can be
manipulated with standard Unix tools; for example, files in an
uncompressed archive can be compressed with the gzip tool. This
format is compressed by default and also supports parallel
dumps.
t
tar
Output a tar-format archive suitable for input into pg_restore.
The tar format is compatible with the directory format:
extracting a tar-format archive produces a valid
directory-format archive. However, the tar format does not
support compression. Also, when using tar format the relative
order of table data items cannot be changed during restore.
-j njobs
--jobs=njobs
Run the dump in parallel by dumping njobs tables simultaneously.
This option may reduce the time needed to perform the dump but it
also increases the load on the database server. You can only use
this option with the directory output format because this is the
only output format where multiple processes can write their data at
the same time.
pg_dump will open njobs + 1 connections to the database, so make
sure your max_connections setting is high enough to accommodate all
connections.
Requesting exclusive locks on database objects while running a
parallel dump could cause the dump to fail. The reason is that the
pg_dump leader process requests shared locks (ACCESS SHARE) on the
objects that the worker processes are going to dump later in order
to make sure that nobody deletes them and makes them go away while
the dump is running. If another client then requests an exclusive
lock on a table, that lock will not be granted but will be queued
waiting for the shared lock of the leader process to be released.
Consequently any other access to the table will not be granted
either and will queue after the exclusive lock request. This
includes the worker process trying to dump the table. Without any
precautions this would be a classic deadlock situation. To detect
this conflict, the pg_dump worker process requests another shared
lock using the NOWAIT option. If the worker process is not granted
this shared lock, somebody else must have requested an exclusive
lock in the meantime and there is no way to continue with the dump,
so pg_dump has no choice but to abort the dump.
To perform a parallel dump, the database server needs to support
synchronized snapshots, a feature that was introduced in PostgreSQL
9.2 for primary servers and 10 for standbys. With this feature,
database clients can ensure they see the same data set even though
they use different connections. pg_dump -j uses multiple database
connections; it connects to the database once with the leader
process and once again for each worker job. Without the
synchronized snapshot feature, the different worker jobs wouldn't
be guaranteed to see the same data in each connection, which could
lead to an inconsistent backup.
-n pattern
--schema=pattern
Dump only schemas matching pattern; this selects both the schema
itself, and all its contained objects. When this option is not
specified, all non-system schemas in the target database will be
dumped. Multiple schemas can be selected by writing multiple -n
switches. The pattern parameter is interpreted as a pattern
according to the same rules used by psql's \d commands (see
Patterns below), so multiple schemas can also be selected by
writing wildcard characters in the pattern. When using wildcards,
be careful to quote the pattern if needed to prevent the shell from
expanding the wildcards; see Examples below.
Note
When -n is specified, pg_dump makes no attempt to dump any
other database objects that the selected schema(s) might depend
upon. Therefore, there is no guarantee that the results of a
specific-schema dump can be successfully restored by themselves
into a clean database.
Note
Non-schema objects such as blobs are not dumped when -n is
specified. You can add blobs back to the dump with the --blobs
switch.
-N pattern
--exclude-schema=pattern
Do not dump any schemas matching pattern. The pattern is
interpreted according to the same rules as for -n. -N can be given
more than once to exclude schemas matching any of several patterns.
When both -n and -N are given, the behavior is to dump just the
schemas that match at least one -n switch but no -N switches. If -N
appears without -n, then schemas matching -N are excluded from what
is otherwise a normal dump.
-O
--no-owner
Do not output commands to set ownership of objects to match the
original database. By default, pg_dump issues ALTER OWNER or SET
SESSION AUTHORIZATION statements to set ownership of created
database objects. These statements will fail when the script is run
unless it is started by a superuser (or the same user that owns all
of the objects in the script). To make a script that can be
restored by any user, but will give that user ownership of all the
objects, specify -O.
This option is ignored when emitting an archive (non-text) output
file. For the archive formats, you can specify the option when you
call pg_restore.
-R
--no-reconnect
This option is obsolete but still accepted for backwards
compatibility.
-s
--schema-only
Dump only the object definitions (schema), not data.
This option is the inverse of --data-only. It is similar to, but
for historical reasons not identical to, specifying
--section=pre-data --section=post-data.
(Do not confuse this with the --schema option, which uses the word
“schema” in a different meaning.)
To exclude table data for only a subset of tables in the database,
see --exclude-table-data.
-S username
--superuser=username
Specify the superuser user name to use when disabling triggers.
This is relevant only if --disable-triggers is used. (Usually, it's
better to leave this out, and instead start the resulting script as
superuser.)
-t pattern
--table=pattern
Dump only tables with names matching pattern. Multiple tables can
be selected by writing multiple -t switches. The pattern parameter
is interpreted as a pattern according to the same rules used by
psql's \d commands (see Patterns below), so multiple tables can
also be selected by writing wildcard characters in the pattern.
When using wildcards, be careful to quote the pattern if needed to
prevent the shell from expanding the wildcards; see Examples below.
As well as tables, this option can be used to dump the definition
of matching views, materialized views, foreign tables, and
sequences. It will not dump the contents of views or materialized
views, and the contents of foreign tables will only be dumped if
the corresponding foreign server is specified with
--include-foreign-data.
The -n and -N switches have no effect when -t is used, because
tables selected by -t will be dumped regardless of those switches,
and non-table objects will not be dumped.
Note
When -t is specified, pg_dump makes no attempt to dump any
other database objects that the selected table(s) might depend
upon. Therefore, there is no guarantee that the results of a
specific-table dump can be successfully restored by themselves
into a clean database.
-T pattern
--exclude-table=pattern
Do not dump any tables matching pattern. The pattern is interpreted
according to the same rules as for -t. -T can be given more than
once to exclude tables matching any of several patterns.
When both -t and -T are given, the behavior is to dump just the
tables that match at least one -t switch but no -T switches. If -T
appears without -t, then tables matching -T are excluded from what
is otherwise a normal dump.
-v
--verbose
Specifies verbose mode. This will cause pg_dump to output detailed
object comments and start/stop times to the dump file, and progress
messages to standard error. Repeating the option causes additional
debug-level messages to appear on standard error.
-V
--version
Print the pg_dump version and exit.
-x
--no-privileges
--no-acl
Prevent dumping of access privileges (grant/revoke commands).
-Z 0..9
--compress=0..9
Specify the compression level to use. Zero means no compression.
For the custom and directory archive formats, this specifies
compression of individual table-data segments, and the default is
to compress at a moderate level. For plain text output, setting a
nonzero compression level causes the entire output file to be
compressed, as though it had been fed through gzip; but the default
is not to compress. The tar archive format currently does not
support compression at all.
--binary-upgrade
This option is for use by in-place upgrade utilities. Its use for
other purposes is not recommended or supported. The behavior of the
option may change in future releases without notice.
--column-inserts
--attribute-inserts
Dump data as INSERT commands with explicit column names (INSERT
INTO table (column, ...) VALUES ...). This will make restoration
very slow; it is mainly useful for making dumps that can be loaded
into non-PostgreSQL databases. Any error during restoring will
cause only rows that are part of the problematic INSERT to be lost,
rather than the entire table contents.
--disable-dollar-quoting
This option disables the use of dollar quoting for function bodies,
and forces them to be quoted using SQL standard string syntax.
--disable-triggers
This option is relevant only when creating a data-only dump. It
instructs pg_dump to include commands to temporarily disable
triggers on the target tables while the data is restored. Use this
if you have referential integrity checks or other triggers on the
tables that you do not want to invoke during data restore.
Presently, the commands emitted for --disable-triggers must be done
as superuser. So, you should also specify a superuser name with -S,
or preferably be careful to start the resulting script as a
superuser.
This option is ignored when emitting an archive (non-text) output
file. For the archive formats, you can specify the option when you
call pg_restore.
--enable-row-security
This option is relevant only when dumping the contents of a table
which has row security. By default, pg_dump will set row_security
to off, to ensure that all data is dumped from the table. If the
user does not have sufficient privileges to bypass row security,
then an error is thrown. This parameter instructs pg_dump to set
row_security to on instead, allowing the user to dump the parts of
the contents of the table that they have access to.
Note that if you use this option currently, you probably also want
the dump be in INSERT format, as the COPY FROM during restore does
not support row security.
--exclude-table-data=pattern
Do not dump data for any tables matching pattern. The pattern is
interpreted according to the same rules as for -t.
--exclude-table-data can be given more than once to exclude tables
matching any of several patterns. This option is useful when you
need the definition of a particular table even though you do not
need the data in it.
To exclude data for all tables in the database, see --schema-only.
--extra-float-digits=ndigits
Use the specified value of extra_float_digits when dumping
floating-point data, instead of the maximum available precision.
Routine dumps made for backup purposes should not use this option.
--if-exists
Use DROP ... IF EXISTS commands to drop objects in --clean mode.
This suppresses “does not exist” errors that might otherwise be
reported. This option is not valid unless --clean is also
specified.
--include-foreign-data=foreignserver
Dump the data for any foreign table with a foreign server matching
foreignserver pattern. Multiple foreign servers can be selected by
writing multiple --include-foreign-data switches. Also, the
foreignserver parameter is interpreted as a pattern according to
the same rules used by psql's \d commands (see Patterns below), so
multiple foreign servers can also be selected by writing wildcard
characters in the pattern. When using wildcards, be careful to
quote the pattern if needed to prevent the shell from expanding the
wildcards; see Examples below. The only exception is that an empty
pattern is disallowed.
Note
When --include-foreign-data is specified, pg_dump does not
check that the foreign table is writable. Therefore, there is
no guarantee that the results of a foreign table dump can be
successfully restored.
--inserts
Dump data as INSERT commands (rather than COPY). This will make
restoration very slow; it is mainly useful for making dumps that
can be loaded into non-PostgreSQL databases. Any error during
restoring will cause only rows that are part of the problematic
INSERT to be lost, rather than the entire table contents. Note that
the restore might fail altogether if you have rearranged column
order. The --column-inserts option is safe against column order
changes, though even slower.
--load-via-partition-root
When dumping data for a table partition, make the COPY or INSERT
statements target the root of the partitioning hierarchy that
contains it, rather than the partition itself. This causes the
appropriate partition to be re-determined for each row when the
data is loaded. This may be useful when restoring data on a server
where rows do not always fall into the same partitions as they did
on the original server. That could happen, for example, if the
partitioning column is of type text and the two systems have
different definitions of the collation used to sort the
partitioning column.
--lock-wait-timeout=timeout
Do not wait forever to acquire shared table locks at the beginning
of the dump. Instead fail if unable to lock a table within the
specified timeout. The timeout may be specified in any of the
formats accepted by SET statement_timeout. (Allowed formats vary
depending on the server version you are dumping from, but an
integer number of milliseconds is accepted by all versions.)
--no-comments
Do not dump comments.
--no-publications
Do not dump publications.
--no-security-labels
Do not dump security labels.
--no-subscriptions
Do not dump subscriptions.
--no-sync
By default, pg_dump will wait for all files to be written safely to
disk. This option causes pg_dump to return without waiting, which
is faster, but means that a subsequent operating system crash can
leave the dump corrupt. Generally, this option is useful for
testing but should not be used when dumping data from production
installation.
--no-table-access-method
Do not output commands to select table access methods. With this
option, all objects will be created with whichever table access
method is the default during restore.
This option is ignored when emitting an archive (non-text) output
file. For the archive formats, you can specify the option when you
call pg_restore.
--no-tablespaces
Do not output commands to select tablespaces. With this option, all
objects will be created in whichever tablespace is the default
during restore.
This option is ignored when emitting an archive (non-text) output
file. For the archive formats, you can specify the option when you
call pg_restore.
--no-toast-compression
Do not output commands to set TOAST compression methods. With this
option, all columns will be restored with the default compression
setting.
--no-unlogged-table-data
Do not dump the contents of unlogged tables and sequences. This
option has no effect on whether or not the table and sequence
definitions (schema) are dumped; it only suppresses dumping the
table and sequence data. Data in unlogged tables and sequences is
always excluded when dumping from a standby server.
--on-conflict-do-nothing
Add ON CONFLICT DO NOTHING to INSERT commands. This option is not
valid unless --inserts, --column-inserts or --rows-per-insert is
also specified.
--quote-all-identifiers
Force quoting of all identifiers. This option is recommended when
dumping a database from a server whose PostgreSQL major version is
different from pg_dump's, or when the output is intended to be
loaded into a server of a different major version. By default,
pg_dump quotes only identifiers that are reserved words in its own
major version. This sometimes results in compatibility issues when
dealing with servers of other versions that may have slightly
different sets of reserved words. Using --quote-all-identifiers
prevents such issues, at the price of a harder-to-read dump script.
--rows-per-insert=nrows
Dump data as INSERT commands (rather than COPY). Controls the
maximum number of rows per INSERT command. The value specified must
be a number greater than zero. Any error during restoring will
cause only rows that are part of the problematic INSERT to be lost,
rather than the entire table contents.
--section=sectionname
Only dump the named section. The section name can be pre-data,
data, or post-data. This option can be specified more than once to
select multiple sections. The default is to dump all sections.
The data section contains actual table data, large-object contents,
and sequence values. Post-data items include definitions of
indexes, triggers, rules, and constraints other than validated
check constraints. Pre-data items include all other data definition
items.
--serializable-deferrable
Use a serializable transaction for the dump, to ensure that the
snapshot used is consistent with later database states; but do this
by waiting for a point in the transaction stream at which no
anomalies can be present, so that there isn't a risk of the dump
failing or causing other transactions to roll back with a
serialization_failure. See Chapter 13 for more information about
transaction isolation and concurrency control.
This option is not beneficial for a dump which is intended only for
disaster recovery. It could be useful for a dump used to load a
copy of the database for reporting or other read-only load sharing
while the original database continues to be updated. Without it the
dump may reflect a state which is not consistent with any serial
execution of the transactions eventually committed. For example, if
batch processing techniques are used, a batch may show as closed in
the dump without all of the items which are in the batch appearing.
This option will make no difference if there are no read-write
transactions active when pg_dump is started. If read-write
transactions are active, the start of the dump may be delayed for
an indeterminate length of time. Once running, performance with or
without the switch is the same.
--snapshot=snapshotname
Use the specified synchronized snapshot when making a dump of the
database (see Table 9.92 for more details).
This option is useful when needing to synchronize the dump with a
logical replication slot (see Chapter 49) or with a concurrent
session.
In the case of a parallel dump, the snapshot name defined by this
option is used rather than taking a new snapshot.
--strict-names
Require that each extension (-e/--extension), schema (-n/--schema)
and table (-t/--table) qualifier match at least one
extension/schema/table in the database to be dumped. Note that if
none of the extension/schema/table qualifiers find matches, pg_dump
will generate an error even without --strict-names.
This option has no effect on -N/--exclude-schema,
-T/--exclude-table, or --exclude-table-data. An exclude pattern
failing to match any objects is not considered an error.
--use-set-session-authorization
Output SQL-standard SET SESSION AUTHORIZATION commands instead of
ALTER OWNER commands to determine object ownership. This makes the
dump more standards-compatible, but depending on the history of the
objects in the dump, might not restore properly. Also, a dump using
SET SESSION AUTHORIZATION will certainly require superuser
privileges to restore correctly, whereas ALTER OWNER requires
lesser privileges.
-?
--help
Show help about pg_dump command line arguments, and exit.
The following command-line options control the database connection
parameters.
-d dbname
--dbname=dbname
Specifies the name of the database to connect to. This is
equivalent to specifying dbname as the first non-option argument on
the command line. The dbname can be a connection string. If so,
connection string parameters will override any conflicting command
line options.
-h host
--host=host
Specifies the host name of the machine on which the server is
running. If the value begins with a slash, it is used as the
directory for the Unix domain socket. The default is taken from the
PGHOST environment variable, if set, else a Unix domain socket
connection is attempted.
-p port
--port=port
Specifies the TCP port or local Unix domain socket file extension
on which the server is listening for connections. Defaults to the
PGPORT environment variable, if set, or a compiled-in default.
-U username
--username=username
User name to connect as.
-w
--no-password
Never issue a password prompt. If the server requires password
authentication and a password is not available by other means such
as a .pgpass file, the connection attempt will fail. This option
can be useful in batch jobs and scripts where no user is present to
enter a password.
-W
--password
Force pg_dump to prompt for a password before connecting to a
database.
This option is never essential, since pg_dump will automatically
prompt for a password if the server demands password
authentication. However, pg_dump will waste a connection attempt
finding out that the server wants a password. In some cases it is
worth typing -W to avoid the extra connection attempt.
--role=rolename
Specifies a role name to be used to create the dump. This option
causes pg_dump to issue a SET ROLE rolename command after
connecting to the database. It is useful when the authenticated
user (specified by -U) lacks privileges needed by pg_dump, but can
switch to a role with the required rights. Some installations have
a policy against logging in directly as a superuser, and use of
this option allows dumps to be made without violating the policy.
ENVIRONMENT
PGDATABASE
PGHOST
PGOPTIONS
PGPORT
PGUSER
Default connection parameters.
PG_COLOR
Specifies whether to use color in diagnostic messages. Possible
values are always, auto and never.
This utility, like most other PostgreSQL utilities, also uses the
environment variables supported by libpq (see Section 34.15).
DIAGNOSTICS
pg_dump internally executes SELECT statements. If you have problems
running pg_dump, make sure you are able to select information from the
database using, for example, psql(1). Also, any default connection
settings and environment variables used by the libpq front-end library
will apply.
The database activity of pg_dump is normally collected by the
cumulative statistics system. If this is undesirable, you can set
parameter track_counts to false via PGOPTIONS or the ALTER USER
command.
NOTES
If your database cluster has any local additions to the template1
database, be careful to restore the output of pg_dump into a truly
empty database; otherwise you are likely to get errors due to duplicate
definitions of the added objects. To make an empty database without any
local additions, copy from template0 not template1, for example:
CREATE DATABASE foo WITH TEMPLATE template0;
When a data-only dump is chosen and the option --disable-triggers is
used, pg_dump emits commands to disable triggers on user tables before
inserting the data, and then commands to re-enable them after the data
has been inserted. If the restore is stopped in the middle, the system
catalogs might be left in the wrong state.
The dump file produced by pg_dump does not contain the statistics used
by the optimizer to make query planning decisions. Therefore, it is
wise to run ANALYZE after restoring from a dump file to ensure optimal
performance; see Section 25.1.3 and Section 25.1.6 for more
information.
Because pg_dump is used to transfer data to newer versions of
PostgreSQL, the output of pg_dump can be expected to load into
PostgreSQL server versions newer than pg_dump's version. pg_dump can
also dump from PostgreSQL servers older than its own version.
(Currently, servers back to version 9.2 are supported.) However,
pg_dump cannot dump from PostgreSQL servers newer than its own major
version; it will refuse to even try, rather than risk making an invalid
dump. Also, it is not guaranteed that pg_dump's output can be loaded
into a server of an older major version — not even if the dump was
taken from a server of that version. Loading a dump file into an older
server may require manual editing of the dump file to remove syntax not
understood by the older server. Use of the --quote-all-identifiers
option is recommended in cross-version cases, as it can prevent
problems arising from varying reserved-word lists in different
PostgreSQL versions.
When dumping logical replication subscriptions, pg_dump will generate
CREATE SUBSCRIPTION commands that use the connect = false option, so
that restoring the subscription does not make remote connections for
creating a replication slot or for initial table copy. That way, the
dump can be restored without requiring network access to the remote
servers. It is then up to the user to reactivate the subscriptions in a
suitable way. If the involved hosts have changed, the connection
information might have to be changed. It might also be appropriate to
truncate the target tables before initiating a new full table copy. If
users intend to copy initial data during refresh they must create the
slot with two_phase = false. After the initial sync, the two_phase
option will be automatically enabled by the subscriber if the
subscription had been originally created with two_phase = true option.
EXAMPLES
To dump a database called mydb into an SQL-script file:
$ pg_dump mydb > db.sql
To reload such a script into a (freshly created) database named newdb:
$ psql -d newdb -f db.sql
To dump a database into a custom-format archive file:
$ pg_dump -Fc mydb > db.dump
To dump a database into a directory-format archive:
$ pg_dump -Fd mydb -f dumpdir
To dump a database into a directory-format archive in parallel with 5
worker jobs:
$ pg_dump -Fd mydb -j 5 -f dumpdir
To reload an archive file into a (freshly created) database named
newdb:
$ pg_restore -d newdb db.dump
To reload an archive file into the same database it was dumped from,
discarding the current contents of that database:
$ pg_restore -d postgres --clean --create db.dump
To dump a single table named mytab:
$ pg_dump -t mytab mydb > db.sql
To dump all tables whose names start with emp in the detroit schema,
except for the table named employee_log:
$ pg_dump -t 'detroit.emp*' -T detroit.employee_log mydb > db.sql
To dump all schemas whose names start with east or west and end in gsm,
excluding any schemas whose names contain the word test:
$ pg_dump -n 'east*gsm' -n 'west*gsm' -N '*test*' mydb > db.sql
The same, using regular expression notation to consolidate the
switches:
$ pg_dump -n '(east|west)*gsm' -N '*test*' mydb > db.sql
To dump all database objects except for tables whose names begin with
ts_:
$ pg_dump -T 'ts_*' mydb > db.sql
To specify an upper-case or mixed-case name in -t and related switches,
you need to double-quote the name; else it will be folded to lower case
(see Patterns below). But double quotes are special to the shell, so in
turn they must be quoted. Thus, to dump a single table with a
mixed-case name, you need something like
$ pg_dump -t "\"MixedCaseName\"" mydb > mytab.sql
SEE ALSO
pg_dumpall(1), pg_restore(1), psql(1)
PostgreSQL 15.7 2024 PG_DUMP(1)
Generated by dwww version 1.15 on Sat Jun 29 02:14:59 CEST 2024.