pg_recvlogical — control PostgreSQL logical decoding streams
pg_recvlogical controls logical
decoding replication slots and streams data from such replication
pg_recvlogical has no equivalent to
the logical decoding SQL interface's peek and get modes. It sends
replay confirmations for data lazily as it receives it and on clean
exit. To examine pending data on a slot without consuming it, use
At least one of the following options must be specified to select an action:
Create a new logical replication slot with the name specified by
--slot, using the output plugin
--plugin, for the database
Drop the replication slot with the name specified by
--slot, then exit.
Begin streaming changes from the logical replication slot
--slot, continuing until
terminated by a signal. If the server side change stream ends with
a server shutdown or disconnect, retry in a loop unless
--no-loop is specified.
The stream format is determined by the output plugin specified when the slot was created.
The connection must be to the same database used to create the slot.
--start can be specified together.
--drop-slot cannot be combined with another
The following command-line options control the location and format of the output and other replication behavior:
--start mode, automatically stop
replication and exit with normal exit status 0 when receiving
reaches the specified LSN. If specified when not in
--start mode, an error is raised.
If there's a record with LSN exactly equal to
lsn, the record will be output.
--endpos option is not aware of
transaction boundaries and may truncate output partway through a
transaction. Any partially output transaction will not be consumed
and will be replayed again when the slot is next read from.
Individual messages are never truncated.
Write received and decoded transaction data into this file. Use
- for stdout.
Specifies how often pg_recvlogical should issue
fsync() calls to ensure the output file is safely
flushed to disk.
The server will occasionally request the client to perform a flush and report the flush position to the server. This setting is in addition to that, to perform flushes more frequently.
Specifying an interval of
altogether, while still reporting progress to the server. In this
case, data could be lost in the event of a crash.
Do not error out when
is specified and a slot with the specified name already exists.
When the connection to the server is lost, do not retry in a loop, just exit.
Pass the option
to the output plugin with, if specified, the option value
value. Which options
exist and their effects depends on the used output plugin.
When creating a slot, use the specified logical decoding output plugin. See Chapter 48. This option has no effect if the slot already exists.
This option has the same effect as the option of the same name in pg_receivewal. See the description there.
--start mode, use the existing
logical replication slot named
--create-slot mode, create the slot with this name.
--drop-slot mode, delete the slot
with this name.
Enables verbose mode.
The following command-line options control the database connection parameters.
The database to connect to. See the description of the actions for what this means in detail. This can be a libpq connection string; see Section 33.1.1 for more information. Defaults to user name.
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.
Specifies the TCP port or local Unix domain socket file
extension on which the server is listening for connections.
Defaults to the
variable, if set, or a compiled-in default.
User name to connect as. Defaults to current operating system user name.
Never issue a password prompt. If the server requires password
authentication and a password is not available by other means such
.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_recvlogical to prompt for a password before connecting to a database.
This option is never essential, since pg_recvlogical will automatically prompt for a
password if the server demands password authentication. However,
pg_recvlogical will waste a
connection attempt finding out that the server wants a password. In
some cases it is worth typing
avoid the extra connection attempt.
The following additional options are available:
Print the pg_recvlogical version and exit.
Show help about pg_recvlogical command line arguments, and exit.
This utility, like most other PostgreSQL utilities, uses the environment variables supported by libpq (see Section 33.14).
See Section 48.1 for an example.
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