一个老外对postgresql.conf的重新组织

配置文件很长,不好管理,一般就是一些主要参数,我们重新组织一下

## Connecting  
port                            = 5432  
listen_addresses                = '*'  
max_connections                 = 100  
ssl                             = on
  
## Memory  
shared_buffers                  = 100MB  
  
## Disk  
fsync                           = on  
synchronous_commit              = on  
full_page_writes                = on  
checkpoint_segments             = 3  
  
## PITR  
archive_mode                    = on  
archive_command                 = 'cp %p /usr/local/pgsql/arch/%f;scp %p 218.193.224.22:/usr/local/pgsql/arch_from_11/%f'  
archive_timeout                 = 0  
wal_level                       = hot_standby
max_wal_senders                 = 1 
  
## Planner  
effective_cache_size            = 128MB  
random_page_cost                = 4.0  
  
## Logging  
log_destination                 = 'stderr'  
logging_collector               = on  
log_filename                    = 'pg%Y-%m-%d_%H%M%S.log'  
silent_mode                     = on
client_min_messages             = log
log_min_messages                = log
log_truncate_on_rotation        = off  
log_rotation_age                = 1d  
log_rotation_size               = 10MB  
log_min_duration_statement      = -1  
log_statement                   = 'none'  
log_line_prefix                 = '%t %u@%d %p'  
  
## Autovacuum  
autovacuum                      = on  
autovacuum_vacuum_scale_factor  = 0.2  
autovacuum_analyze_scale_factor = 0.1  

还可以把一些替换参数集合起来,放在一个位置,如文件尾部,用于快速替换这些参数
老外举了一个了例子,在大流量访问的时候以下三个参数关闭,避免影响性能.

## Bulk loading only - leave 'on' for everyday use!
autovacuum                      = off
fsync                           = off
full_page_writes                = off

遵循后置有效哦,同一参数设置以最后一次出现为准.
而且8.3以后新配置文件中删除了前一次的配置项后reload自动变默认,
以前版本删除了配置文件中某项设置,reload后保持前一设置不变