PostgreSQL归档配置及自动清理归档日志的操作

# - Archiving - 
 
是否开启归档 
#archive_mode = off       # enables archiving; off, on, or always 
                # (change requires restart) 
 
归档命令，注意 %p %f %% 格式化的含义。 
%p 是被归档的redo文件的路径，  
%f 是被归档的redo文档的文件名   
%% 是百分号 
#archive_command = ''      # command to use to archive a logfile segment 
                # placeholders: %p = path of file to archive 
                #        %f = file name only 
                # e.g. 'test ! -f /mnt/server/archivedir/%f && cp %p /mnt/server/archivedir/%f' 
 
超时强制归档，例：如果10分钟数据库都没有什么活动，一个redo文件没有写完，就不会归档， 
但是我们希望数据库至少10分钟要切换一个日志，则可以使用archive_timeout 
#archive_timeout = 0      # force a logfile segment switch after this 
                # number of seconds; 0 disables 

pg12@oracle-> mkdir -p $PGDATA/archive/

pg12@oracle-> vi $PGDATA/arch.sh
test ! -f $PGDATA/arch/$1 && cp --preserve=timestamps $2 $PGDATA/arch/$1 ; find /arch/ -type f -mtime +7 -exec rm -f {} \;

wal_level = replica 
archive_mode = on 
archive_command = 'arch.sh %f %p'

pg12@oracle-> ps -ef|grep archiver
pg12 21338 21331 0 20:20 "htmlcode">

cp: writing `/arch/20171204/000000010000000000000002': No space left on device
LOG: archive command failed with exit code 1
DETAIL: The failed archive command was: DATE=`date +%Y%m%d`;DIR="/arch/$DATE";(test -d $DIR || mkdir -p $DIR)&& cp pg_xlog/000000010000000000000002 $DIR/000000010000000000000002
cp: writing `/arch/20171204/000000010000000000000002': No space left on device
LOG: archive command failed with exit code 1
DETAIL: The failed archive command was: DATE=`date +%Y%m%d`;DIR="/arch/$DATE";(test -d $DIR || mkdir -p $DIR)&& cp pg_xlog/000000010000000000000002 $DIR/000000010000000000000002
cp: writing `/arch/20171204/000000010000000000000002': No space left on device
LOG: archive command failed with exit code 1
DETAIL: The failed archive command was: DATE=`date +%Y%m%d`;DIR="/arch/$DATE";(test -d $DIR || mkdir -p $DIR)&& cp pg_xlog/000000010000000000000002 $DIR/000000010000000000000002
WARNING: archiving transaction log file "000000010000000000000002" failed too many times, will try again later


原因是归档日志所在文件系统/arch空间不足。
通过清理该文件系统下过期的临时文件，或将归档日志存放至更大的系统空间中。
以上为个人经验，希望能给大家一个参考，也希望大家多多支持。如有错误或未考虑完全的地方，望不吝赐教。