pg_dumpall — extract a PostgreSQL database cluster into a script file
pg_dumpall is a utility for writing out (“dumping”) all PostgreSQL databases of a cluster into one script file. The script file contains SQL commands that can be used as input to psql to restore the databases. It does this by calling pg_dump for each database in the cluster. pg_dumpall also dumps global objects that are common to all databases, that is, database roles and tablespaces. (pg_dump does not save these objects.)
Since pg_dumpall reads tables from all databases you will most likely have to connect as a database superuser in order to produce a complete dump. Also you will need superuser privileges to execute the saved script in order to be allowed to add roles and create databases.
The SQL script will be written to the standard output. Use the
--file option or shell operators to redirect it into a file.
pg_dumpall needs to connect several times to the PostgreSQL server (once per database). If you use password authentication it will ask for a password each time. It is convenient to have a
~/.pgpass file in such cases. See Section 34.15 for more information.
The following command-line options control the content and format of the output.
Dump only the data, not the schema (data definitions).
Include SQL commands to clean (drop) databases before recreating them.
DROP commands for roles and tablespaces are added as well.
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.)
Send output to the specified file. If this is omitted, the standard output is used.
Dump only global objects (roles and tablespaces), no databases.
Dump object identifiers (OIDs) as part of the data for every table. Use this option if your application references the OID columns in some way (e.g., in a foreign key constraint). Otherwise, this option should not be used.
Do not output commands to set ownership of objects to match the original database. By default, pg_dumpall issues
ALTER OWNER or
SET SESSION AUTHORIZATION statements to set ownership of created schema elements. 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
Dump only roles, no databases or tablespaces.
Dump only the object definitions (schema), not data.
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.)
Dump only tablespaces, no databases or roles.
Specifies verbose mode. This will cause pg_dumpall to output start/stop times to the dump file, and progress messages to standard error. It will also enable verbose output in pg_dump.
Print the pg_dumpall version and exit.
Prevent dumping of access privileges (grant/revoke commands).
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.
Dump data as
INSERT commands with explicit column names (
INSERT INTO ). This will make restoration very slow; it is mainly useful for making dumps that can be loaded into non-PostgreSQL databases.
column, ...) VALUES ...
This option disables the use of dollar quoting for function bodies, and forces them to be quoted using SQL standard string syntax.
This option is relevant only when creating a data-only dump. It instructs pg_dumpall 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.
Use conditional commands (i.e., add an
IF EXISTS clause) to drop databases and other objects. This option is not valid unless
--clean is also specified.
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. Note that the restore might fail altogether if you have rearranged column order. The
--column-inserts option is safer, though even slower.
When dumping data for a table partition, make the
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.
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 values vary depending on the server version you are dumping from, but an integer number of milliseconds is accepted by all versions since 7.3. This option is ignored when dumping from a pre-7.3 server.
Do not dump comments.
Do not dump publications.
Do not dump passwords for roles. When restored, roles will have a null password, and password authentication will always fail until the password is set. Since password values aren't needed when this option is specified, the role information is read from the catalog view
pg_roles instead of
pg_authid. Therefore, this option also helps if access to
pg_authid is restricted by some security policy.
Do not dump security labels.
Do not dump subscriptions.
pg_dumpall will wait for all files to be written safely to disk. This option causes
pg_dumpall 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.
Do not output commands to create tablespaces nor select tablespaces for objects. With this option, all objects will be created in whichever tablespace is the default during restore.
Do not dump the contents of unlogged tables. This option has no effect on whether or not the table definitions (schema) are dumped; it only suppresses dumping the table data.
Force quoting of all identifiers. This option is recommended when dumping a database from a server whose PostgreSQL major version is different from pg_dumpall's, or when the output is intended to be loaded into a server of a different major version. By default, pg_dumpall 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.
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.
Show help about pg_dumpall command line arguments, and exit.
The following command-line options control the database connection parameters.
Specifies parameters used to connect to the server, as a connection string; these will override any conflicting command line options.
The option is called
--dbname for consistency with other client applications, but because pg_dumpall needs to connect to many databases, the database name in the connection string will be ignored. Use the
-l option to specify the name of the database used for the initial connection, which will dump global objects and discover what other databases should be dumped.
Specifies the host name of the machine on which the database 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.
Specifies the name of the database to connect to for dumping global objects and discovering what other databases should be dumped. If not specified, the
postgres database will be used, and if that does not exist,
template1 will be used.
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.
User name to connect as.
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.
Force pg_dumpall to prompt for a password before connecting to a database.
This option is never essential, since pg_dumpall will automatically prompt for a password if the server demands password authentication. However, pg_dumpall 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.
Note that the password prompt will occur again for each database to be dumped. Usually, it's better to set up a
~/.pgpass file than to rely on manual password entry.
Specifies a role name to be used to create the dump. This option causes pg_dumpall to issue a
rolename command after connecting to the database. It is useful when the authenticated user (specified by
-U) lacks privileges needed by pg_dumpall, 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.
Default connection parameters
This utility, like most other PostgreSQL utilities, also uses the environment variables supported by libpq (see Section 34.14).
Since pg_dumpall calls pg_dump internally, some diagnostic messages will refer to pg_dump.
--clean option can be useful even when your intention is to restore the dump script into a fresh cluster. Use of
--clean authorizes the script to drop and re-create the built-in
template1 databases, ensuring that those databases will retain the same properties (for instance, locale and encoding) that they had in the source cluster. Without the option, those databases will retain their existing database-level properties, as well as any pre-existing contents.
Once restored, it is wise to run
ANALYZE on each database so the optimizer has useful statistics. You can also run
vacuumdb -a -z to analyze all databases.
The dump script should not be expected to run completely without errors. In particular, because the script will issue
CREATE ROLE for every role existing in the source cluster, it is certain to get a “role already exists” error for the bootstrap superuser, unless the destination cluster was initialized with a different bootstrap superuser name. This error is harmless and should be ignored. Use of the
--clean option is likely to produce additional harmless error messages about non-existent objects, although you can minimize those by adding
pg_dumpall requires all needed tablespace directories to exist before the restore; otherwise, database creation will fail for databases in non-default locations.
To dump all databases:
pg_dumpall > db.out
To restore database(s) from this file, you can use:
psql -f db.out postgres
It is not important to which database you connect here since the script file created by pg_dumpall will contain the appropriate commands to create and connect to the saved databases. An exception is that if you specified
--clean, you must connect to the
postgres database initially; the script will attempt to drop other databases immediately, and that will fail for the database you are connected to.
Check pg_dump for details on possible error conditions.
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