數據庫輸出日誌太多造成網頁卡頓

解決這個問題主要修改兩個地方的配置文件
1、 /usr/local/pgsql/data/postgresql.conf

# Where to keep a log file
#註釋掉這句
#PGLOG="$PGDATA/serverlog"


#刪除兩處輸出
#改動1
#su - $PGUSER -c "$DAEMON -D '$PGDATA' &" >>$PGLOG 2>&1修改爲
#su - $PGUSER -c "$DAEMON -D '$PGDATA' &"
#改動2
#su - $PGUSER -c "$DAEMON -D '$PGDATA' &" >>$PGLOG 2>&1修改爲
#su - $PGUSER -c "$DAEMON -D '$PGDATA' &"
# Parse command line parameters.
case $1 in
  start)
	echo -n "Starting PostgreSQL: "
	test x"$OOM_SCORE_ADJ" != x && echo "$OOM_SCORE_ADJ" > /proc/self/oom_score_adj
	test x"$OOM_ADJ" != x && echo "$OOM_ADJ" > /proc/self/oom_adj
	su - $PGUSER -c "$DAEMON -D '$PGDATA' &" >>$PGLOG 2>&1
	echo "ok"
	;;
  stop)
	echo -n "Stopping PostgreSQL: "
	su - $PGUSER -c "$PGCTL stop -D '$PGDATA' -s -m fast"
	echo "ok"
	;;
  restart)
	echo -n "Restarting PostgreSQL: "
	su - $PGUSER -c "$PGCTL stop -D '$PGDATA' -s -m fast -w"
	test x"$OOM_SCORE_ADJ" != x && echo "$OOM_SCORE_ADJ" > /proc/self/oom_score_adj
	test x"$OOM_ADJ" != x && echo "$OOM_ADJ" > /proc/self/oom_adj
	su - $PGUSER -c "$DAEMON -D '$PGDATA' &" >>$PGLOG 2>&1
	echo "ok"
	;;
  reload)
        echo -n "Reload PostgreSQL: "
        su - $PGUSER -c "$PGCTL reload -D '$PGDATA' -s"
        echo "ok"
        ;;
  status)
	su - $PGUSER -c "$PGCTL status -D '$PGDATA'"
	;;
  *)
	# Print help
	echo "Usage: $0 {start|stop|restart|reload|status}" 1>&2
	exit 1
	;;
esac

exit 0

2、/etc/init.d/postgrssql

#------------------------------------------------------------------------------
# ERROR REPORTING AND LOGGING
#------------------------------------------------------------------------------

# - Where to Log -

#log_destination = 'stderr'		# Valid values are combinations of
					# stderr, csvlog, syslog, and eventlog,
					# depending on platform.  csvlog
					# requires logging_collector to be on.

# This is used when logging to stderr:
#logging_collector = off		# Enable capturing of stderr and csvlog
					# into log files. Required to be on for
					# csvlogs.
					# (change requires restart)

# These are only used if logging_collector is on:
#log_directory = 'pg_log'		# directory where log files are written,
					# can be absolute or relative to PGDATA
#log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log'	# log file name pattern,
					# can include strftime() escapes
#log_file_mode = 0600			# creation mode for log files,
					# begin with 0 to use octal notation
#log_truncate_on_rotation = off		# If on, an existing log file with the
					# same name as the new log file will be
					# truncated rather than appended to.
					# But such truncation only occurs on
					# time-driven rotation, not on restarts
					# or size-driven rotation.  Default is
					# off, meaning append to existing files
					# in all cases.
#log_rotation_age = 1d			# Automatic rotation of logfiles will
					# happen after that time.  0 disables.
#log_rotation_size = 10MB		# Automatic rotation of logfiles will
					# happen after that much log output.
					# 0 disables.

對默認值中的如下參數進行改動（打開註釋）

logging_collector = on	
log_directory = 'pg_log'
log_filename = 'postgresql-%a.log'
log_truncate_on_rotation = on	

做了如上修改之後，數據庫日誌文件的輸出路徑變更爲/usr/local/pgsql/data/pg_log

參考文獻：
https://www.cnblogs.com/alianbog/p/5596921.html