pgbouncer-admin

Description

The PgBouncer Adminstration Console is available via . Connect to the PgBouncer port and the virtual database named pgbouncer to log in to the console.

Users listed in the pgbouncer.ini configuration parameters admin_users and stats_users have privileges to log in to the PgBouncer Administration Console.

You can control connections between PgBouncer and Greenplum Database from the console. You can also set PgBouncer configuration parameters.

-p port

The PgBouncer port number.

Command Syntax

pgbouncer=# SHOW help;
NOTICE:  Console usage
DETAIL:  
    SHOW HELP|CONFIG|DATABASES|POOLS|CLIENTS|SERVERS|VERSION
    SHOW FDS|SOCKETS|ACTIVE_SOCKETS|LISTS|MEM
    SHOW DNS_HOSTS|DNS_ZONES
    SHOW STATS|STATS_TOTALS|STATS_AVERAGES
    SET key = arg
    RELOAD
    PAUSE [<db>]
    RESUME [<db>]
    DISABLE <db>
    ENABLE <db>
    KILL <db>
    SUSPEND
    SHUTDOWN

The following PgBouncer administration commands control the running pgbouncer process.

PAUSE [db]

If no database is specified, PgBouncer tries to disconnect from all servers, first waiting for all queries to complete. The command will not return before all queries are finished. This command is to be used to prepare to restart the database.

If a database name is specified, PgBouncer pauses only that database.

If you run a command, and then a PAUSE command to pause all databases, you must execute two RESUME commands, one for all databases, and one for the named database.

SUSPEND

All socket buffers are flushed and PgBouncer stops listening for data on them. The command will not return before all buffers are empty. To be used when rebooting PgBouncer online.

RESUME [ db ]

If a database was specified for the PAUSE command, the database must also be specified with the RESUME command.

After pausing all databases with the PAUSE command, resuming a single database with RESUME db is not supported.

DISABLE db

Reject all new client connections on the database.

ENABLE db

Allow new client connections on the database.

KILL db

Immediately drop all client and server connections to the named database.

SHUTDOWN

Stop PgBouncer process. To exit from the psql command line session, enter \q.

RELOAD

The PgBouncer process reloads the current configuration file and updates the changeable settings.

SET key = value

SHOW Command

The SHOW category command displays different types of PgBouncer information. You can specify one of the following categories:

ACTIVE_SOCKETS
DATABASES
DNS_ZONES
POOLS
SOCKETS
STATS_TOTALS
LISTS
USERS

CLIENTS

Column	Description
type	C, for client.
user	Client connected user.
database	Database name.
state	State of the client connection, one of `active`, `used`, `waiting` or `idle`.
addr	IP address of client, or `unix` for a socket connection.
port	Port client is connected to.
local_addr	Connection end address on local machine.
local_port	Connection end port on local machine.
connect_time	Timestamp of connect time.
request_time	Timestamp of latest client request.
wait	Time waiting.
wait_us	Time waiting (microseconds).
ptr	Address of internal object for this connection. Used as unique ID.
link	Address of server connection the client is paired with.
remote_pid	Process ID, if client connects with Unix socket and the OS supports getting it.
tls	Client TLS context.

CONFIG

List of current PgBouncer parameter settings

Column	Description
key	Configuration variable name
value	Configuration value
changeable	Either `yes` or `no`. Shows whether the variable can be changed while running. If , the variable can be changed only at boot time.

DATABASES

Column	Description
name	Name of configured database entry.
host	Host pgbouncer connects to.
port	Port pgbouncer connects to.
database	Actual database name pgbouncer connects to.
force_user	When user is part of the connection string, the connection between pgbouncer and the database server is forced to the given user, whatever the client user.
pool_size	Maximum number of server connections.
reserve_pool	The number of additional connections that can be created if the pool reaches `pool_size`.
pool_mode	The database’s override `pool_mode` or NULL if the default will be used instead.
max_connections	Maximum number of connections for all pools for this database.
current_connections	The total count of connections for all pools for this database.
paused	Paused/unpaused state of the database.
deactivated	Enabled/deactivated state of the database.

DNS_HOSTS

Column	Description
zonename	Zone name
serial	Current DNS serial number
count	Hostnames belonging to this zone

FDS

SHOW FDS is an internal command used for an online restart, for example when upgrading to a new PgBouncer version. It displays a list of file descriptors in use with the internal state attached to them. This command blocks the internal event loop, so it should not be used while PgBouncer is in use.

When the connected user has username “pgbouncer”, connects through a Unix socket, and has the same UID as the running process, the actual file descriptors are passed over the connection.

Column	Description
fd	File descriptor numeric value.
task	One of `pooler`, `client`, or `server`.
user	User of the connection using the file descriptor.
database	Database of the connection using the file descriptor.
addr	IP address of the connection using the file descriptor, “unix” if a Unix socket is used.
port	Port used by the connection using the file descriptor.
cancel	Cancel key for this connection.
link	File descriptor for corresponding server/client. NULL if idle.
client_encoding	Character set used for the database.
std_strings	This controls whether ordinary string literals (‘…’) treat backslashes literally, as specified in the SQL standard.
datestyle	Display format for date and time values.
timezone	The timezone for interpreting and displaying time stamps.
password	`auth_user`‘s password.

LISTS

Shows the following PgBouncer statistcs in two columns: the item label and value.

Item	Description
databases	Count of databases.
users	Count of users.
pools	Count of pools.
free_clients	Count of free clients.
used_clients	Count of used clients.
login_clients	Count of clients in `login` state.
free_servers	Count of free servers.
used_servers	Count of used servers.
dns_names	Count of DNS names.
dns_zones	Count of DNS zones.
dns_queries	Count of DNS queries.
dns_pending	Count of in-flight DNS queries.

MEM

Shows cache memory information for these PgBouncer caches:

user_cache
db_cache
pool_cache
server_cache
client_cache
iobuf_cache

POOLS

A new pool entry is made for each pair of (database, user).

Column	Description
database	Database name.
user	User name.
cl_active	Client connections that are linked to server connection and can process queries.
cl_waiting	Client connections have sent queries but have not yet got a server connection.
sv_active	Server connections that linked to client.
sv_idle	Server connections that are unused and immediately usable for client queries.
sv_used	Server connections that have been idle more than `server_check_delay`. The `server_check_query` query must be run on them before they can be used.
sv_tested	Server connections that are currently running either `server_reset_query` or `server_check_query`.
sv_login	Server connections currently in process of logging in.
maxwait	How long the first (oldest) client in the queue has waited, in seconds. If this begins to increase, the current pool of servers does not handle requests fast enough. The cause may be either an overloaded server or the `pool_size` setting is too small.
maxwait_us	`max_wait` (microseconds).
pool_mode	The pooling mode in use.

Column	Description
type	S, for server.
user	User ID that `pgbouncer` uses to connect to server.
database	Database name.
state	State of the pgbouncer server connection, one of `active`, `used`, or `idle`.
addr	IP address of the Greenplum or PostgreSQL server.
port	Port of the Greenplum or PostgreSQL server.
local_addr	Connection start address on local machine.
local_port	Connection start port on local machine.
connect_time	When the connection was made.
request_time	When the last request was issued.
wait	Time waiting.
wait_us	Time waiting (microseconds).
ptr	Address of the internal object for this connection. Used as unique ID.
link	Address of gthe client connection the server is paired with.
remote_pid	Pid of backend server process. If the connection is made over Unix socket and the OS supports getting process ID info, it is the OS pid. Otherwise it is extracted from the cancel packet the server sent, which should be PID in case server is PostgreSQL, but it is a random number in case server is another PgBouncer.
tls	TLS context.

STATS

Shows statistics.

Column	Description
database	Statistics are presented per database.
total_xact_count	Total number of SQL transactions pooled by PgBouncer.
total_query_count	Total number of SQL queries pooled by PgBouncer.
total_received	Total volume in bytes of network traffic received by `pgbouncer`.
total_sent	Total volume in bytes of network traffic sent by `pgbouncer`.
total_xact_time	Total number of microseconds spent by PgBouncer when connected to Greenplum Database in a transaction, either idle in transaction or executing queries.
total_query_time	Total number of microseconds spent by `pgbouncer` when actively connected to the database server.
total_wait_time	Time spent (in microseconds) by clients waiting for a server.
avg_xact_count	Average number of SQL transactions pooled by PgBouncer.
avg_query_count	Average queries per second in last stats period.
avg_recv	Average received (from clients) bytes per second.
avg_sent	Average sent (to clients) bytes per second.
avg_xact_time	Average transaction duration in microseconds.
avg_query_time	Average query duration in microseconds.
avg_wait_time	Time spent by clients waiting for a server in microseconds (average per second).

STATS_AVERAGES

Subset of SHOW STATS showing the average values for selected statistics.

STATS_TOTALS

Subset of showing the total values for selected statistics.

USERS

Display PgBouncer version information.

Note: This reference documentation is based on the PgBouncer 1.8.1 documentation.

, pgbouncer.ini