PostgreSQL的日志文件介绍

PostgreSQL的日志文件

pg_log:数据库活动日志（也就是数据库的操作日志）；

pg_xlog:事务日志；

pg_clog:事务状态日志（pg_clog是pg_xlog的辅助日志）。

现在主要介绍pg_log

pg_log的文件内容是可以自定义的，可以通过命令来定义也可以通过修改配置文件postgresql.conf来定义.

主要需要修改的参数如下，参数修改完毕后重启服务，重新连接数据库，对其操作即可查看日志变化情况。

# - When to Log -

client_min_messages = info

#client_min_messages = notice             # values in order of decreasing detail:

                                            #   debug5

                                            #   debug4

                                            #   debug3

                                            #   debug2

                                            #   debug1

                                            #   log

                                            #   notice

                                            #   warning

                                            #   error

log_min_messages = info

#log_min_messages = warning               # values in order of decreasing detail:

                                            #   debug5

                                            #   debug4

                                            #   debug3

                                            #   debug2

                                            #   debug1

                                            #   info

                                            #   notice

                                            #   warning

                                            #   error

                                            #   log

                                            #   fatal

                                            #   panic

log_min_error_statement = info

#log_min_error_statement = error       # values in order of decreasing detail:

                                           #   debug5

                                            #   debug4

                                            #   debug3

                                            #   debug2

                                            #   debug1

                                           #   info

                                            #   notice

                                            #   warning

                                            #   error

                                            #   log

                                            #   fatal

                                            #   panic (effectively off)

#log_min_duration_statement = -1       # -1 is disabled, 0 logs all statements

                                            # and their durations, > 0 logs only

                                            # statements running at least this number

                                            # of milliseconds

# - What to Log -

#debug_print_parse = off

#debug_print_rewritten = off

#debug_print_plan = off

#debug_pretty_print = on

#log_checkpoints = off

log_connections = on

log_disconnections = on

#log_duration = off

log_error_verbosity = verbose               # terse, default, or verbose messages

#log_hostname = off

log_line_prefix = '%a %u %d %h %t %i %e '                    # special values:

                                            #   %a = application name

                                            #   %u = user name

                                            #   %d = database name

                                            #   %r = remote host and port（this is a os port）

                                            #   %h = remote host

                                            #   %p = process ID

                                            #   %t = timestamp without milliseconds

                                            #   %m = timestamp with milliseconds

                                            #   %i = command tag

                                            #   %e = SQL state

                                            #   %c = session ID

                                            #   %l = session line number

                                            #   %s = session start timestamp

                                            #   %v = virtual transaction ID

                                            #   %x = transaction ID (0 if none)

                                            #   %q = stop here in non-session

                                            #        processes

                                            #   %% = '%'

                                            # e.g. '<%u%%%d> '

#log_lock_waits = off                      # log lock waits >= deadlock_timeout

log_statement = 'all'                        # none, ddl, mod, all

#log_temp_files = -1                        # log temporary files equal or larger

                                            # than the specified size in kilobytes;

                                            # -1 disables, 0 logs all temp files

log_timezone = 'Asia/Hong_Kong'