官方说明：

显示一个PostgreSQL数据库集簇的控制信息
display control information of a PostgreSQL database cluster

详见：http://www.postgres.cn/docs/13/app-pgcontroldata.html

[gpadmin-master@yz219 demoDataDir0]$ pwd
/opt/software/gpdb-master/gpAux/gpdemo/datadirs/dbfast1/demoDataDir0

[gpadmin-master@yz219 demoDataDir0]$ pg_controldata .
pg_control version number:            9600700
Catalog version number:               302006131
Database system identifier:           6865960197649762497
Database cluster state:               in production
pg_control last modified:             2021年06月30日 星期三 18时45分03秒
Latest checkpoint location:           0/125643B0
Prior checkpoint location:            0/125642C8
Latest checkpoint's REDO location:    0/12564378
Latest checkpoint's REDO WAL file:    000000010000000000000004
Latest checkpoint's TimeLineID:       1
Latest checkpoint's PrevTimeLineID:   1
Latest checkpoint's full_page_writes: on
Latest checkpoint's NextXID:          0:835
Latest checkpoint's NextOID:          33108
Latest checkpoint's NextRelfilenode:  24878
Latest checkpoint's NextMultiXactId:  1
Latest checkpoint's NextMultiOffset:  0
Latest checkpoint's oldestXID:        529
Latest checkpoint's oldestXID's DB:   1
Latest checkpoint's oldestActiveXID:  835
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:            2021年06月30日 星期三 18时45分03秒
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:                off
max_connections setting:              250
max_worker_processes setting:         12
max_prepared_xacts setting:           250
max_locks_per_xact setting:           128
track_commit_timestamp setting:       off
Maximum data alignment:               8
Database block size:                  32768
Blocks per segment of large relation: 32768
WAL block size:                       32768
Bytes per WAL segment:                67108864
Maximum length of identifiers:        64
Maximum columns in an index:          32
Maximum size of a TOAST chunk:        8140
Size of a large-object chunk:         8192
Date/time type storage:               64-bit integers
Float4 argument passing:              by value
Float8 argument passing:              by value
Data page checksum version:           1