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
