一，主备查看与使用

　　01，pg_controldata 

--主机信息
[postgres@kafka01 pgdata]$ pg_controldata -D /data/pgdata/
pg_control version number:            1002
Catalog version number:               201707211
Database system identifier:           6818043668731457858
Database cluster state:               in production   --主要鉴别参数
pg_control last modified:             Tue 09 Jun 2020 10:47:43 AM CST
Latest checkpoint location:           2/90161F0
Prior checkpoint location:            2/9000028
Latest checkpoint's REDO location:    2/90161B8
Latest checkpoint's REDO WAL file:    000000030000000200000009
Latest checkpoint's TimeLineID:       3
Latest checkpoint's PrevTimeLineID:   3
Latest checkpoint's full_page_writes: on
Latest checkpoint's NextXID:          0:2026
Latest checkpoint's NextOID:          33184
Latest checkpoint's NextMultiXactId:  1
Latest checkpoint's NextMultiOffset:  0
Latest checkpoint's oldestXID:        548
Latest checkpoint's oldestXID's DB:   1
Latest checkpoint's oldestActiveXID:  2026
Latest checkpoint's oldestMultiXid:   1
Latest checkpoint's oldestMulti's DB: 1
Latest checkpoint's oldestCommitTsXid:0
Latest checkpoint's newestCommitTsXid:0
Time of latest checkpoint:            Tue 09 Jun 2020 10:47:41 AM CST
Fake LSN counter for unlogged rels:   0/1
Minimum recovery ending location:     0/0
Min recovery ending loc's timeline:   0
Backup start location:                0/0
Backup end location:                  0/0
End-of-backup record required:        no
wal_level setting:                    replica
wal_log_hints setting:                on
max_connections setting:              100
max_worker_processes setting:         8
max_prepared_xacts setting:           0
max_locks_per_xact setting:           64
track_commit_timestamp setting:       off
Maximum data alignment:               8
Database block size:                  8192
Blocks per segment of large relation: 131072
WAL block size:                       8192
Bytes per WAL segment:                16777216
Maximum length of identifiers:        64
Maximum columns in an index:          32
Maximum size of a TOAST chunk:        1996
Size of a large-object chunk:         2048
Date/time type storage:               64-bit integers
Float4 argument passing:              by value
Float8 argument passing:              by value
Data page checksum version:           0
Mock authentication nonce:            0caad19ad346b9cd934c9fcef61f0b12bb9475a10f209d63a2997cebadceb8af

--备库参数信息
[postgres@pg_standby psql]$ pg_controldata -D /data/pgdata/
pg_control version number:            1002
Catalog version number:               201707211
Database system identifier:           6818043668731457858
Database cluster state:               in archive recovery
pg_control last modified:             Tue 09 Jun 2020 10:47:49 AM CST
Latest checkpoint location:           2/90161F0
Prior checkpoint location:            2/8000108
Latest checkpoint's REDO location:    2/90161B8
Latest checkpoint's REDO WAL file:    000000030000000200000009
Latest checkpoint's TimeLineID:       3
Latest checkpoint's PrevTimeLineID:   3
Latest checkpoint's full_page_writes: on
Latest checkpoint's NextXID:          0:2026
Latest checkpoint's NextOID:          33184
Latest checkpoint's NextMultiXactId:  1
Latest checkpoint's NextMultiOffset:  0
Latest checkpoint's oldestXID:        548
Latest checkpoint's oldestXID's DB:   1
Latest checkpoint's oldestActiveXID:  2026
Latest checkpoint's oldestMultiXid:   1
Latest checkpoint's oldestMulti's DB: 1
Latest checkpoint's oldestCommitTsXid:0
Latest checkpoint's newestCommitTsXid:0
Time of latest checkpoint:            Tue 09 Jun 2020 10:47:41 AM CST
Fake LSN counter for unlogged rels:   0/1
Minimum recovery ending location:     2/9016298
Min recovery ending loc's timeline:   3
Backup start location:                0/0
Backup end location:                  0/0
End-of-backup record required:        no
wal_level setting:                    replica
wal_log_hints setting:                on
max_connections setting:              100
max_worker_processes setting:         8
max_prepared_xacts setting:           0
max_locks_per_xact setting:           64
track_commit_timestamp setting:       off
Maximum data alignment:               8
Database block size:                  8192
Blocks per segment of large relation: 131072
WAL block size:                       8192
Bytes per WAL segment:                16777216
Maximum length of identifiers:        64
Maximum columns in an index:          32
Maximum size of a TOAST chunk:        1996
Size of a large-object chunk:         2048
Date/time type storage:               64-bit integers
Float4 argument passing:              by value
Float8 argument passing:              by value
Data page checksum version:           0
Mock authentication nonce:            0caad19ad346b9cd934c9fcef61f0b12bb9475a10f209d63a2997cebadceb8af



--！！！ 主机的cluster state是in production，备机的cluster state是in archive recovery。

　　02，pg_stat_replication

kingledb=> select * from pg_stat_replication

　　03，进程信息

主库的：

 

 备库的：

 

 　　04，函数查看