[Pgpool-general] Parallel SELECT retrieve only half of the results

[Sandeep Thakkar]

I was also trying to setup parallel queries and got some information about the 
setup from pgpool doc. But I have some queries like:

Do I need to create table like "accounts, branches, history" ? and What are 
"aid, tid" in the function definition? 



Thanks.




________________________________
From: Alessandro Candini <candini at meeo.it>
To: pgpool-general at pgfoundry.org
Sent: Mon, January 31, 2011 5:04:28 PM
Subject: [Pgpool-general] Parallel SELECT retrieve only half of the results

Hi, I have configured pgpool-II-3.0.1 with postgresql-9.0.2 for parallel 
queries:

listen_addresses = '*'
port = 9999
pcp_port = 9898
socket_dir = '/tmp'
pcp_socket_dir = '/tmp'
backend_socket_dir = '/tmp'
pcp_timeout = 10
num_init_children = 32
max_pool = 4
child_life_time = 0
connection_life_time = 0
child_max_connections = 0
client_idle_limit = 0
authentication_timeout = 60
logdir = '/var/log/pgpool'
pid_file_name = '/var/log/pgpool/pgpool.pid'
replication_mode = true
load_balance_mode = false
replication_stop_on_mismatch = false
failover_if_affected_tuples_mismatch = false
replicate_select = true
reset_query_list = 'ABORT; DISCARD ALL'
white_function_list = ''
black_function_list = 'nextval,setval'
print_timestamp = true
master_slave_mode = false
master_slave_sub_mode = 'stream'
delay_threshold = 100
log_standby_delay = 'if_over_threshold'
connection_cache = true
health_check_timeout = 10
health_check_period = 10
health_check_user = 'postgis'
failover_command = '/usr/lib/pgpool-II/3.0.1/bin/failover.sh %h %H
/tmp/trigger_file0'
failback_command = '/usr/lib/pgpool-II/3.0.1/bin/failback.sh %h %M
/tmp/trigger_file0 %m'
fail_over_on_backend_error = false
insert_lock = true
ignore_leading_white_space = false
log_statement = false
log_per_node_statement = false
log_connections = false
log_hostname = false
parallel_mode = true
enable_query_cache = false
pgpool2_hostname = ''
system_db_hostname = '192.168.0.128'
system_db_port = 5433
system_db_dbname = 'pgpool'
system_db_schema = 'pgpool_catalog'
system_db_user = 'pgpool'
system_db_password = ''
backend_hostname0 = '192.168.0.128'
backend_port0 = 5433
backend_weight0 = 1
backend_data_directory0 = '/home/database/9.0.2/data'
backend_hostname1 = '192.168.0.125'
backend_port1 = 5433
backend_weight1 = 1
backend_data_directory1 = '/home/database/9.0.2/data'
enable_pool_hba = false
recovery_user = 'postgis'
recovery_password = 'gispost'
recovery_1st_stage_command = 'basebackup.sh'
recovery_2nd_stage_command = ''
recovery_timeout = 60
client_idle_limit_in_recovery = 0
lobj_lock_table = 'pgpool_lobj_lock'
ssl = false
debug_level = 0

I have splitted the same db on the two machines 192.168.0.128 (the System DB)
and 192.168.0.125, but when I perform something like "SELECT COUNT(*) FROM
mytable" it retrieves only the data on the system DB...
I expected to obtain the sum of data on the two nodes.
Where am I wrong?

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