Good afternoon,
I have two servers hosted on Azure with PostgreSQL 9.6 databases. One database is production, the other is standby.
For replication I use stream replication between servers. However the application of the archives in the standby database is slow, always generating replication lag.
The replication lag increases considerably when queries are performed on the StandBy database. I wonder if there is any setting that can be made to improve this performance.
Server Production
SO: CentOS Linux release 7.4.1708 (Core) 64Bits
CPU: Intel(R) Xeon(R) CPU E5-2698B v3 @ 2.00GHz - 15 Cores
Memory: 240GB
I/O: 17TB RAID0 (17 Disks (1TB for disk) SSD with read and write cache enabled)
Server StandBy
SO: CentOS Linux release 7.4.1708 (Core) 64Bits
CPU: Intel(R) Xeon(R) CPU E5-2673 v3 @ 2.40GHz - 20 Cores
Memory: 140GB
I/O: 22TB RAID0 (22 Disks (1TB for disk) SSD with read and write cache enabled)
Configuration PostgreSQL Production
postgres.conf
listen_addresses = '*'
port = 5433
max_connections = 2000
superuser_reserved_connections = 3
shared_buffers = 56GB
work_mem = 29360kB
maintenance_work_mem = 4GB
autovacuum_work_mem = 8GB
max_stack_depth = 5MB
dynamic_shared_memory_type = posix
bgwriter_delay = 10ms
bgwriter_lru_maxpages = 700
bgwriter_lru_multiplier = 2.0
fsync = off
synchronous_commit = on
full_page_writes = off
wal_buffers = 1500MB
wal_writer_delay = 1ms
checkpoint_timeout = 10min
max_wal_size = 4GB
min_wal_size = 2GB
checkpoint_completion_target = 0.9
effective_cache_size = 168GB
default_statistics_target = 500
log_destination = 'csvlog'
logging_collector = on
log_directory = 'pg_log'
log_filename = 'postgresql-%w.log'
log_file_mode = 0640
log_truncate_on_rotation = on
log_rotation_age = 1d
log_rotation_size = 600MB
log_min_duration_statement = 0
log_checkpoints = off
log_connections = off
log_disconnections = off
log_duration = off
log_line_prefix = '%t [%p]: [%l-1] db=%d,user=%u,app=%a,client=%h'
log_lock_waits = on
log_timezone = 'Brazil/East'
autovacuum = on
log_autovacuum_min_duration = -1
autovacuum_max_workers = 12
autovacuum_naptime = 30s
autovacuum_vacuum_threshold = 20
autovacuum_analyze_threshold = 20
autovacuum_vacuum_scale_factor = 0.2
autovacuum_analyze_scale_factor = 0.1
autovacuum_vacuum_cost_delay = 20
autovacuum_vacuum_cost_limit = 800
vacuum_cost_delay = 20
vacuum_cost_limit = 800
datestyle = 'iso, mdy'
timezone = 'Brazil/East'
lc_messages = 'en_US.UTF-8'
lc_monetary = 'en_US.UTF-8'
lc_numeric = 'en_US.UTF-8'
lc_time = 'en_US.UTF-8'
default_text_search_config = 'pg_catalog.english'
max_locks_per_transaction = 256
pgpool.pg_ctl = '/usr/pgsql-9.6/bin/pg_ctl'
effective_io_concurrency = 10
wal_level = hot_standby
max_wal_senders = 10
max_replication_slots = 3
wal_keep_segments = 38400
Configuration PostgreSQL StandBy
postgres.conf
listen_addresses = '*'
port = 5433
max_connections = 2000
superuser_reserved_connections = 3
shared_buffers = 10GB
work_mem = 183500kB
maintenance_work_mem = 4GB
autovacuum_work_mem = 8GB
max_stack_depth = 5MB
dynamic_shared_memory_type = posix
bgwriter_delay = 10ms
bgwriter_lru_maxpages = 700
bgwriter_lru_multiplier = 2.0
fsync = off
synchronous_commit = on
full_page_writes = off
wal_buffers = 16MB
wal_writer_delay = 1ms
checkpoint_timeout = 10min
max_wal_size = 4GB
min_wal_size = 2GB
checkpoint_completion_target = 0.9
effective_cache_size = 104GB
default_statistics_target = 500
log_destination = 'csvlog'
logging_collector = on
log_directory = 'pg_log'
log_filename = 'postgresql-%w.log'
log_file_mode = 0640
log_truncate_on_rotation = on
log_rotation_age = 1d
log_rotation_size = 600MB
log_min_duration_statement = 0
log_checkpoints = off
log_connections = off
log_disconnections = off
log_duration = off
log_line_prefix = '%t [%p]: [%l-1] db=%d,user=%u,app=%a,client=%h'
log_lock_waits = on
log_timezone = 'Brazil/East'
autovacuum = on
log_autovacuum_min_duration = -1
autovacuum_max_workers = 3
autovacuum_naptime = 30s
autovacuum_vacuum_threshold = 20
autovacuum_analyze_threshold = 20
autovacuum_vacuum_scale_factor = 0.2
autovacuum_analyze_scale_factor = 0.1
autovacuum_vacuum_cost_delay = 20
autovacuum_vacuum_cost_limit = 800
vacuum_cost_delay = 20
vacuum_cost_limit = 800
datestyle = 'iso, mdy'
timezone = 'Brazil/East'
lc_messages = 'en_US.UTF-8'
lc_monetary = 'en_US.UTF-8'
lc_numeric = 'en_US.UTF-8'
lc_time = 'en_US.UTF-8'
default_text_search_config = 'pg_catalog.english'
max_locks_per_transaction = 256
pgpool.pg_ctl = '/usr/pgsql-9.6/bin/pg_ctl'
effective_io_concurrency = 10
max_worker_processes = 18
hot_standby = on
hot_standby_feedback = on
recovery.conf
standby_mode = 'on'
primary_slot_name = 'replicacao'
primary_conninfo = 'host=bdreplica00 port=5433 user=replicator password='
trigger_file = '/var/lib/pgsql/9.6/data/master_db.conf'
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