[pgpool-general: 5248] Re: PGPOOL lb issue
ahmad milani
milani.ahmad at gmail.com
Mon Jan 16 23:59:39 JST 2017
Hi Lazaro,
pgpool can connect to the postgresql dbs with user pgpool and pass:
psql -U pgpool -W --dbname=postgres --host pgdb2 -c "\l"
Password for user pgpool:
List of databases
Name | Owner | Encoding | Collate | Ctype | Access
privileges
-----------+------------+----------+-------------+-------------+-----------------------
postgres | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 |
repmgr | repmgr | UTF8 | en_US.UTF-8 | en_US.UTF-8 |
template0 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 |
=c/postgres +
| | | | |
postgres=CTc/postgres
template1 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 |
=c/postgres +
test2 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 |
test3 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 |
Im doing an insert query.
Ty
On Mon, Jan 16, 2017 at 6:01 PM, Lazaro Garcia <lazaro3487 at gmail.com> wrote:
> What about postgresql node info in pgpool ?
>
>
>
> Can pgpool connect to postgresql servers throw pgpool user with pool
> password?
>
>
>
> sr_check_user = 'pgpool'
>
> # Streaming replication check user
>
> # This is neccessary even if you
> disable streaming
>
> # replication delay check by
> sr_check_period = 0
>
> sr_check_password = 'pool'
>
>
>
> Is the write query an Insert, Update or Delete? The write query is any
> select over an store procedure?
>
>
>
> Regards.
>
>
>
> *De:* pgpool-general-bounces at pgpool.net [mailto:pgpool-general-
> bounces at pgpool.net] *En nombre de *ahmad milani
> *Enviado el:* lunes, 16 de enero de 2017 5:32
> *Para:* pgpool-general at pgpool.net
> *Asunto:* [pgpool-general: 5235] PGPOOL lb issue
>
>
>
> Hi,
>
>
> I have in issue with pgpool2 and cannot figure out why!!!! my setup is as
> follows:
>
> singe pgpool to do LB for me
>
> master slave postgress
>
> The issue is as follows, when i send read queries via the pgpool
> everything is fine, load get distributed between and master and salve.
>
> but when im doing a query that writes to the database the pgpool again
> uses both slave and master and it yeilds error on queries sent to slave.
>
> I have installed 96 on centos.
>
>
>
> # ----------------------------
>
> # pgPool-II configuration file
>
> # ----------------------------
>
> #
>
> # This file consists of lines of the form:
>
> #
>
> # name = value
>
> #
>
> # Whitespace may be used. Comments are introduced with "#" anywhere on a
> line.
>
> # The complete list of parameter names and allowed values can be found in
> the
>
> # pgPool-II documentation.
>
> #
>
> # This file is read on server startup and when the server receives a SIGHUP
>
> # signal. If you edit the file on a running system, you have to SIGHUP the
>
> # server for the changes to take effect, or use "pgpool reload". Some
>
> # parameters, which are marked below, require a server shutdown and
> restart to
>
> # take effect.
>
> #
>
>
>
>
>
> #-----------------------------------------------------------
> -------------------
>
> # CONNECTIONS
>
> #-----------------------------------------------------------
> -------------------
>
>
>
> # - pgpool Connection Settings -
>
>
>
> listen_addresses = '*'
>
> # Host name or IP address to listen on:
>
> # '*' for all, '' for no TCP/IP
> connections
>
> # (change requires restart)
>
> port = 5432
>
> # Port number
>
> # (change requires restart)
>
> socket_dir = '/tmp'
>
> # Unix domain socket path
>
> # The Debian package defaults to
>
> # /var/run/postgresql
>
> # (change requires restart)
>
>
>
>
>
> # - pgpool Communication Manager Connection Settings -
>
>
>
> pcp_listen_addresses = '*'
>
> # Host name or IP address for pcp
> process to listen on:
>
> # '*' for all, '' for no TCP/IP
> connections
>
> # (change requires restart)
>
> pcp_port = 9898
>
> # Port number for pcp
>
> # (change requires restart)
>
> pcp_socket_dir = '/tmp'
>
> # Unix domain socket path for pcp
>
> # The Debian package defaults to
>
> # /var/run/postgresql
>
> # (change requires restart)
>
> listen_backlog_multiplier = 2
>
> # Set the backlog parameter of
> listen(2) to
>
> # num_init_children * listen_backlog_multiplier.
>
> # (change requires restart)
>
> serialize_accept = off
>
> # whether to serialize accept() call to
> avoid thundering herd problem
>
> # (change requires restart)
>
>
>
> # - Backend Connection Settings -
>
>
>
> backend_hostname0 = 'pgdb1'
>
> # Host name or IP address to connect to
> for backend 0
>
> backend_port0 = 5432
>
> # Port number for backend 0
>
> backend_weight0 = 1
>
> # Weight for backend 0 (only in load
> balancing mode)
>
> backend_data_directory0 = '/var/lib/pgsql/9.5/data'
>
> # Data directory for backend 0
>
> backend_flag0 = 'ALLOW_TO_FAILOVER'
>
> # Controls various backend behavior
>
> # ALLOW_TO_FAILOVER or
> DISALLOW_TO_FAILOVER
>
> backend_hostname1 = 'pgdb2'
>
> backend_port1 = 5432
>
> backend_weight1 = 1
>
> backend_data_directory1 = '/var/lib/pgsql/9.5/data'
>
> backend_flag1 = 'ALLOW_TO_FAILOVER'
>
>
>
> # - Authentication -
>
>
>
> enable_pool_hba = on
>
> # Use pool_hba.conf for client
> authentication
>
> pool_passwd = 'pool_passwd'
>
> # File name of pool_passwd for md5
> authentication.
>
> # "" disables pool_passwd.
>
> # (change requires restart)
>
> authentication_timeout = 60
>
> # Delay in seconds to complete client
> authentication
>
> # 0 means no timeout.
>
>
>
> # - SSL Connections -
>
>
>
> ssl = off
>
> # Enable SSL support
>
> # (change requires restart)
>
> #ssl_key = './server.key'
>
> # Path to the SSL private key file
>
> # (change requires restart)
>
> #ssl_cert = './server.cert'
>
> # Path to the SSL public certificate
> file
>
> # (change requires restart)
>
> #ssl_ca_cert = ''
>
> # Path to a single PEM format file
>
> # containing CA root certificate(s)
>
> # (change requires restart)
>
> #ssl_ca_cert_dir = ''
>
> # Directory containing CA root
> certificate(s)
>
> # (change requires restart)
>
>
>
>
>
> #-----------------------------------------------------------
> -------------------
>
> # POOLS
>
> #-----------------------------------------------------------
> -------------------
>
>
>
> # - Concurrent session and pool size -
>
>
>
> num_init_children = 32
>
> # Number of concurrent sessions allowed
>
> # (change requires restart)
>
> max_pool = 4
>
> # Number of connection pool caches per
> connection
>
> # (change requires restart)
>
>
>
> # - Life time -
>
>
>
> child_life_time = 300
>
> # Pool exits after being idle for this
> many seconds
>
> child_max_connections = 0
>
> # Pool exits after receiving that many
> connections
>
> # 0 means no exit
>
> connection_life_time = 0
>
> # Connection to backend closes after
> being idle for this many seconds
>
> # 0 means no close
>
> client_idle_limit = 0
>
> # Client is disconnected after being
> idle for that many seconds
>
> # (even inside an explicit
> transactions!)
>
> # 0 means no disconnection
>
>
>
>
>
> #-----------------------------------------------------------
> -------------------
>
> # LOGS
>
> #-----------------------------------------------------------
> -------------------
>
>
>
> # - Where to log -
>
>
>
> log_destination = 'stderr'
>
> # Where to log
>
> # Valid values are combinations of
> stderr,
>
> # and syslog. Default to stderr.
>
>
>
> # - What to log -
>
>
>
> log_line_prefix = '%t: pid %p: ' # printf-style string to output at
> beginning of each log line.
>
>
>
> log_connections = off
>
> # Log connections
>
> log_hostname = off
>
> # Hostname will be shown in ps status
>
> # and in logs if connections are logged
>
> log_statement = off
>
> # Log all statements
>
> log_per_node_statement = off
>
> # Log all statements
>
> # with node and backend informations
>
> log_standby_delay = 'if_over_threshold'
>
> # Log standby delay
>
> # Valid values are combinations of
> always,
>
> # if_over_threshold, none
>
>
>
> # - Syslog specific -
>
>
>
> syslog_facility = 'LOCAL0'
>
> # Syslog local facility. Default to
> LOCAL0
>
> syslog_ident = 'pgpool'
>
> # Syslog program identification string
>
> # Default to 'pgpool'
>
>
>
> # - Debug -
>
>
>
> debug_level = 0
>
> # Debug message verbosity level
>
> # 0 means no message, 1 or more mean
> verbose
>
>
>
> #log_error_verbosity = default # terse, default, or verbose
> messages
>
>
>
> #client_min_messages = notice # values in order of decreasing
> detail:
>
> # debug5
>
> # debug4
>
> # debug3
>
> # debug2
>
> # debug1
>
> # log
>
> # notice
>
> # warning
>
> # error
>
>
>
> #log_min_messages = warning # values in order of decreasing
> detail:
>
> # debug5
>
> # debug4
>
> # debug3
>
> # debug2
>
> # debug1
>
> # info
>
> # notice
>
> # warning
>
> # error
>
> # log
>
> # fatal
>
> # panic
>
>
>
> #-----------------------------------------------------------
> -------------------
>
> # FILE LOCATIONS
>
> #-----------------------------------------------------------
> -------------------
>
>
>
> pid_file_name = '/var/run/pgpool-II-95/pgpool.pid'
>
> # PID file name
>
> # (change requires restart)
>
> logdir = '/tmp'
>
> # Directory of pgPool status file
>
> # (change requires restart)
>
>
>
>
>
> #-----------------------------------------------------------
> -------------------
>
> # CONNECTION POOLING
>
> #-----------------------------------------------------------
> -------------------
>
>
>
> connection_cache = on
>
> # Activate connection pools
>
> # (change requires restart)
>
>
>
> # Semicolon separated list of queries
>
> # to be issued at the end of a session
>
> # The default is for 8.3 and later
>
> reset_query_list = 'ABORT; DISCARD ALL'
>
> # The following one is for 8.2 and
> before
>
> #reset_query_list = 'ABORT; RESET ALL; SET SESSION AUTHORIZATION DEFAULT'
>
>
>
>
>
> #-----------------------------------------------------------
> -------------------
>
> # REPLICATION MODE
>
> #-----------------------------------------------------------
> -------------------
>
>
>
> replication_mode = off
>
> # Activate replication mode
>
> # (change requires restart)
>
> replicate_select = off
>
> # Replicate SELECT statements
>
> # when in replication mode
>
> # replicate_select is higher priority
> than
>
> # load_balance_mode.
>
>
>
> insert_lock = off
>
> # Automatically locks a dummy row or a
> table
>
> # with INSERT statements to keep SERIAL
> data
>
> # consistency
>
> # Without SERIAL, no lock will be issued
>
> lobj_lock_table = ''
>
> # When rewriting lo_creat command in
>
> # replication mode, specify table name
> to
>
> # lock
>
>
>
> # - Degenerate handling -
>
>
>
> replication_stop_on_mismatch = off
>
> # On disagreement with the packet kind
>
> # sent from backend, degenerate the node
>
> # which is most likely "minority"
>
> # If off, just force to exit this
> session
>
>
>
> failover_if_affected_tuples_mismatch = off
>
> # On disagreement with the number of
> affected
>
> # tuples in UPDATE/DELETE queries, then
>
> # degenerate the node which is most
> likely
>
> # "minority".
>
> # If off, just abort the transaction to
>
> # keep the consistency
>
>
>
>
>
> #-----------------------------------------------------------
> -------------------
>
> # LOAD BALANCING MODE
>
> #-----------------------------------------------------------
> -------------------
>
>
>
> load_balance_mode = on
>
> # Activate load balancing mode
>
> # (change requires restart)
>
> ignore_leading_white_space = on
>
> # Ignore leading white spaces of each
> query
>
> white_function_list = ''
>
> # Comma separated list of function names
>
> # that don't write to database
>
> # Regexp are accepted
>
> black_function_list = 'currval,lastval,nextval,setval'
>
> # Comma separated list of function names
>
> # that write to database
>
> # Regexp are accepted
>
>
>
> database_redirect_preference_list = ''
>
> # comma separated list of pairs of database and node id.
>
> # example: postgres:primary,mydb[0-4]:1,mydb[5-9]:2'
>
> # valid for streaming replicaton mode only.
>
>
>
> app_name_redirect_preference_list = ''
>
> # comma separated list of pairs of app name and node id.
>
> # example: 'psql:primary,myapp[0-4]:1,myapp[5-9]:standby'
>
> # valid for streaming replicaton mode only.
>
> allow_sql_comments = off
>
> # if on, ignore SQL comments when judging if load balance or
>
> # query cache is possible.
>
> # If off, SQL comments effectively prevent the judgment
>
> # (pre 3.4 behavior).
>
>
>
> #-----------------------------------------------------------
> -------------------
>
> # MASTER/SLAVE MODE
>
> #-----------------------------------------------------------
> -------------------
>
>
>
> master_slave_mode = on
>
> # Activate master/slave mode
>
> # (change requires restart)
>
> master_slave_sub_mode = 'stream'
>
> # Master/slave sub mode
>
> # Valid values are combinations slony or
>
> # stream. Default is slony.
>
> # (change requires restart)
>
>
>
> # - Streaming -
>
>
>
> sr_check_period = 10
>
> # Streaming replication check period
>
> # Disabled (0) by default
>
> sr_check_user = 'pgpool'
>
> # Streaming replication check user
>
> # This is neccessary even if you
> disable streaming
>
> # replication delay check by
> sr_check_period = 0
>
> sr_check_password = 'pool'
>
> # Password for streaming replication
> check user
>
> sr_check_database = 'postgres'
>
> # Database name for streaming
> replication check
>
> delay_threshold = 10000000
>
> # Threshold before not dispatching
> query to standby node
>
> # Unit is in bytes
>
> # Disabled (0) by default
>
>
>
> # - Special commands -
>
>
>
> follow_master_command = ''
>
> # Executes this command after master
> failover
>
> # Special values:
>
> # %d = node id
>
> # %h = host name
>
> # %p = port number
>
> # %D = database cluster path
>
> # %m = new master node id
>
> # %H = hostname of the new master node
>
> # %M = old master node id
>
> # %P = old primary node id
>
> # %r = new master port number
>
> # %R = new master database cluster path
>
> # %% = '%' character
>
>
>
> #-----------------------------------------------------------
> -------------------
>
> # HEALTH CHECK
>
> #-----------------------------------------------------------
> -------------------
>
>
>
> health_check_period = 10
>
> # Health check period
>
> # Disabled (0) by default
>
> health_check_timeout = 20
>
> # Health check timeout
>
> # 0 means no timeout
>
> health_check_user = 'pgpool'
>
> # Health check user
>
> health_check_password = 'pool'
>
> # Password for health check user
>
> health_check_database = ''
>
> # Database name for health check. If
> '', tries 'postgres' frist,
>
> health_check_max_retries = 0
>
> # Maximum number of times to retry a
> failed health check before giving up.
>
> health_check_retry_delay = 1
>
> # Amount of time to wait (in seconds)
> between retries.
>
> connect_timeout = 10000
>
> # Timeout value in milliseconds before
> giving up to connect to backend.
>
> # Default is 10000 ms (10 second). Flaky network user may want to
> increase
>
> # the value. 0 means no timeout.
>
> # Note that this value is not only used for health check,
>
> # but also for ordinary conection to backend.
>
>
>
> #-----------------------------------------------------------
> -------------------
>
> # FAILOVER AND FAILBACK
>
> #-----------------------------------------------------------
> -------------------
>
>
>
> failover_command = '/etc/pgpool-II-95/failover.sh %d %H'
>
> # Executes this command at failover
>
> # Special values:
>
> # %d = node id
>
> # %h = host name
>
> # %p = port number
>
> # %D = database cluster path
>
> # %m = new master node id
>
> # %H = hostname of the new master node
>
> # %M = old master node id
>
> # %P = old primary node id
>
> # %r = new master port number
>
> # %R = new master database cluster path
>
> # %% = '%' character
>
> failback_command = ''
>
> # Executes this command at failback.
>
> # Special values:
>
> # %d = node id
>
> # %h = host name
>
> # %p = port number
>
> # %D = database cluster path
>
> # %m = new master node id
>
> # %H = hostname of the new master node
>
> # %M = old master node id
>
> # %P = old primary node id
>
> # %r = new master port number
>
> # %R = new master database cluster path
>
> # %% = '%' character
>
>
>
> fail_over_on_backend_error = on
>
> # Initiates failover when
> reading/writing to the
>
> # backend communication socket fails
>
> # If set to off, pgpool will report an
>
> # error and disconnect the session.
>
>
>
> search_primary_node_timeout = 300
>
> # Timeout in seconds to search for the
>
> # primary node when a failover occurs.
>
> # 0 means no timeout, keep searching
>
> # for a primary node forever.
>
>
>
> #-----------------------------------------------------------
> -------------------
>
> # ONLINE RECOVERY
>
> #-----------------------------------------------------------
> -------------------
>
>
>
> recovery_user = 'pgpool'
>
> # Online recovery user
>
> recovery_password = 'pool'
>
> # Online recovery password
>
> recovery_1st_stage_command = ''
>
> # Executes a command in first stage
>
> recovery_2nd_stage_command = ''
>
> # Executes a command in second stage
>
> recovery_timeout = 90
>
> # Timeout in seconds to wait for the
>
> # recovering node's postmaster to start
> up
>
> # 0 means no wait
>
> client_idle_limit_in_recovery = 0
>
> # Client is disconnected after being
> idle
>
> # for that many seconds in the second
> stage
>
> # of online recovery
>
> # 0 means no disconnection
>
> # -1 means immediate disconnection
>
>
>
>
>
> #-----------------------------------------------------------
> -------------------
>
> # WATCHDOG
>
> #-----------------------------------------------------------
> -------------------
>
>
>
> # - Enabling -
>
>
>
> use_watchdog = off
>
> # Activates watchdog
>
> # (change requires restart)
>
>
>
> # -Connection to up stream servers -
>
>
>
> trusted_servers = ''
>
> # trusted server list which are used
>
> # to confirm network connection
>
> # (hostA,hostB,hostC,...)
>
> # (change requires restart)
>
> ping_path = '/bin'
>
> # ping command path
>
> # (change requires restart)
>
>
>
> # - Watchdog communication Settings -
>
>
>
> wd_hostname = ''
>
> # Host name or IP address of this
> watchdog
>
> # (change requires restart)
>
> wd_port = 9000
>
> # port number for watchdog service
>
> # (change requires restart)
>
> wd_priority = 1
>
> # priority of this watchdog in leader election
>
> # (change requires restart)
>
>
>
> wd_authkey = ''
>
> # Authentication key for watchdog
> communication
>
> # (change requires restart)
>
>
>
> wd_ipc_socket_dir = '/tmp'
>
> # Unix domain socket path for watchdog IPC socket
>
> # The Debian package defaults to
>
> # /var/run/postgresql
>
> # (change requires restart)
>
>
>
>
>
> # - Virtual IP control Setting -
>
>
>
> delegate_IP = ''
>
> # delegate IP address
>
> # If this is empty, virtual IP never
> bring up.
>
> # (change requires restart)
>
> if_cmd_path = '/sbin'
>
> # path to the directory where
> if_up/down_cmd exists
>
> # (change requires restart)
>
> if_up_cmd = 'ip addr add $_IP_$/24 dev eth0 label eth0:0'
>
> # startup delegate IP command
>
> # (change requires restart)
>
> if_down_cmd = 'ip addr del $_IP_$/24 dev eth0'
>
> # shutdown delegate IP command
>
> # (change requires restart)
>
> arping_path = '/usr/sbin'
>
> # arping command path
>
> # (change requires restart)
>
> arping_cmd = 'arping -U $_IP_$ -w 1'
>
> # arping command
>
> # (change requires restart)
>
>
>
> # - Behaivor on escalation Setting -
>
>
>
> clear_memqcache_on_escalation = on
>
> # Clear all the query cache on shared
> memory
>
> # when standby pgpool escalate to
> active pgpool
>
> # (= virtual IP holder).
>
> # This should be off if client
> connects to pgpool
>
> # not using virtual IP.
>
> # (change requires restart)
>
> wd_escalation_command = ''
>
> # Executes this command at escalation
> on new active pgpool.
>
> # (change requires restart)
>
> wd_de_escalation_command = ''
>
> # Executes this command when master pgpool resigns from being master.
>
> # (change requires restart)
>
>
>
> # - Lifecheck Setting -
>
>
>
> # -- common --
>
>
>
> wd_monitoring_interfaces_list = '' # Comma separated list of interfaces
> names to monitor.
>
> # if any interface from the list is active the watchdog will
>
> # consider the network is fine
>
> # 'any' to enable monitoring on all interfaces except loopback
>
> # '' to disable monitoring
>
>
>
> wd_lifecheck_method = 'heartbeat'
>
> # Method of watchdog lifecheck
> ('heartbeat' or 'query' or 'external')
>
> # (change requires restart)
>
> wd_interval = 10
>
> # lifecheck interval (sec) > 0
>
> # (change requires restart)
>
>
>
> # -- heartbeat mode --
>
>
>
> wd_heartbeat_port = 9694
>
> # Port number for receiving heartbeat
> signal
>
> # (change requires restart)
>
> wd_heartbeat_keepalive = 2
>
> # Interval time of sending heartbeat
> signal (sec)
>
> # (change requires restart)
>
> wd_heartbeat_deadtime = 30
>
> # Deadtime interval for heartbeat
> signal (sec)
>
> # (change requires restart)
>
> heartbeat_destination0 = 'host0_ip1'
>
> # Host name or IP address of
> destination 0
>
> # for sending heartbeat signal.
>
> # (change requires restart)
>
> heartbeat_destination_port0 = 9694
>
> # Port number of destination 0 for
> sending
>
> # heartbeat signal. Usually this is the
>
> # same as wd_heartbeat_port.
>
> # (change requires restart)
>
> heartbeat_device0 = ''
>
> # Name of NIC device (such like 'eth0')
>
> # used for sending/receiving heartbeat
>
> # signal to/from destination 0.
>
> # This works only when this is not
> empty
>
> # and pgpool has root privilege.
>
> # (change requires restart)
>
>
>
> #heartbeat_destination1 = 'host0_ip2'
>
> #heartbeat_destination_port1 = 9694
>
> #heartbeat_device1 = ''
>
>
>
> # -- query mode --
>
>
>
> wd_life_point = 3
>
> # lifecheck retry times
>
> # (change requires restart)
>
> wd_lifecheck_query = 'SELECT 1'
>
> # lifecheck query to pgpool from
> watchdog
>
> # (change requires restart)
>
> wd_lifecheck_dbname = 'template1'
>
> # Database name connected for lifecheck
>
> # (change requires restart)
>
> wd_lifecheck_user = 'nobody'
>
> # watchdog user monitoring pgpools in
> lifecheck
>
> # (change requires restart)
>
> wd_lifecheck_password = ''
>
> # Password for watchdog user in
> lifecheck
>
> # (change requires restart)
>
>
>
> # - Other pgpool Connection Settings -
>
>
>
> #other_pgpool_hostname0 = 'host0'
>
> # Host name or IP address to connect
> to for other pgpool 0
>
> # (change requires restart)
>
> #other_pgpool_port0 = 5432
>
> # Port number for othet pgpool 0
>
> # (change requires restart)
>
> #other_wd_port0 = 9000
>
> # Port number for othet watchdog 0
>
> # (change requires restart)
>
> #other_pgpool_hostname1 = 'host1'
>
> #other_pgpool_port1 = 5432
>
> #other_wd_port1 = 9000
>
>
>
>
>
> #-----------------------------------------------------------
> -------------------
>
> # OTHERS
>
> #-----------------------------------------------------------
> -------------------
>
> relcache_expire = 0
>
> # Life time of relation cache in
> seconds.
>
> # 0 means no cache expiration(the
> default).
>
> # The relation cache is used for cache
> the
>
> # query result against PostgreSQL system
>
> # catalog to obtain various information
>
> # including table structures or if it's
> a
>
> # temporary table or not. The cache is
>
> # maintained in a pgpool child local
> memory
>
> # and being kept as long as it survives.
>
> # If someone modify the table by using
>
> # ALTER TABLE or some such, the
> relcache is
>
> # not consistent anymore.
>
> # For this purpose, cache_expiration
>
> # controls the life time of the cache.
>
> relcache_size = 256
>
> # Number of relation cache
>
> # entry. If you see frequently:
>
> # "pool_search_relcache: cache replacement happend"
>
> # in the pgpool log, you might want to increate this number.
>
>
>
> check_temp_table = on
>
> # If on, enable temporary table check
> in SELECT statements.
>
> # This initiates queries against system
> catalog of primary/master
>
> # thus increases load of master.
>
> # If you are absolutely sure that your system never uses temporary
> tables
>
> # and you want to save access to primary/master, you could turn this
> off.
>
> # Default is on.
>
>
>
> check_unlogged_table = on
>
> # If on, enable unlogged table check in
> SELECT statements.
>
> # This initiates queries against system
> catalog of primary/master
>
> # thus increases load of master.
>
> # If you are absolutely sure that your
> system never uses unlogged tables
>
> # and you want to save access to
> primary/master, you could turn this off.
>
> # Default is on.
>
>
>
> #-----------------------------------------------------------
> -------------------
>
> # IN MEMORY QUERY MEMORY CACHE
>
> #-----------------------------------------------------------
> -------------------
>
> memory_cache_enabled = off
>
> # If on, use the memory cache functionality, off by default
>
> memqcache_method = 'shmem'
>
> # Cache storage method. either 'shmem'(shared memory) or
>
> # 'memcached'. 'shmem' by default
>
> # (change requires restart)
>
> memqcache_memcached_host = 'localhost'
>
> # Memcached host name or IP address. Mandatory if
>
> # memqcache_method = 'memcached'.
>
> # Defaults to localhost.
>
> # (change requires restart)
>
> memqcache_memcached_port = 11211
>
> # Memcached port number. Mondatory if memqcache_method = 'memcached'.
>
> # Defaults to 11211.
>
> # (change requires restart)
>
> memqcache_total_size = 67108864
>
> # Total memory size in bytes for storing memory cache.
>
> # Mandatory if memqcache_method = 'shmem'.
>
> # Defaults to 64MB.
>
> # (change requires restart)
>
> memqcache_max_num_cache = 1000000
>
> # Total number of cache entries. Mandatory
>
> # if memqcache_method = 'shmem'.
>
> # Each cache entry consumes 48 bytes on shared memory.
>
> # Defaults to 1,000,000(45.8MB).
>
> # (change requires restart)
>
> memqcache_expire = 0
>
> # Memory cache entry life time specified in seconds.
>
> # 0 means infinite life time. 0 by default.
>
> # (change requires restart)
>
> memqcache_auto_cache_invalidation = on
>
> # If on, invalidation of query cache is triggered by corresponding
>
> # DDL/DML/DCL(and memqcache_expire). If off, it is only triggered
>
> # by memqcache_expire. on by default.
>
> # (change requires restart)
>
> memqcache_maxcache = 409600
>
> # Maximum SELECT result size in bytes.
>
> # Must be smaller than memqcache_cache_block_size. Defaults to 400KB.
>
> # (change requires restart)
>
> memqcache_cache_block_size = 1048576
>
> # Cache block size in bytes. Mandatory if memqcache_method = 'shmem'.
>
> # Defaults to 1MB.
>
> # (change requires restart)
>
> memqcache_oiddir = '/var/log/pgpool/oiddir'
>
> # Temporary work directory to record table oids
>
> # (change requires restart)
>
> white_memqcache_table_list = ''
>
> # Comma separated list of table names
> to memcache
>
> # that don't write to database
>
> # Regexp are accepted
>
> black_memqcache_table_list = ''
>
> # Comma separated list of table names
> not to memcache
>
> # that don't write to database
>
> # Regexp are accepted
>
>
>
> ---------+----------+------+--------+-----------+---------+------------
>
> 0 | pgdb1 | 5432 | 2 | 0.500000 | primary | 10581
>
> 1 | pgdb2 | 5432 | 2 | 0.500000 | standby | 2351
>
>
>
> Role | Name | Upstream | Connection String
>
> ----------+-------|----------|-------------------------------------
>
> standby | pgdb2 | | host=pgdb2 user=repmgr dbname=repmgr
>
> * master | pgdb1 | | host=pgdb1 user=repmgr dbname=repmgr
>
>
>
> The errors I see on the web server:
>
>
> PreventCommandIfReadOnly
>
> cannot execute SELECT in a read-only transaction
>
>
>
--
Ahmad Milani
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