postgres: logical replication launcher 这个进程是启动就有的

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PG16 一启动，就有 postgres: logical replication launcher  这个进程，与是否启动逻辑复制，没有关系

[root@standby ~]# ps -ef|grep postgres
root        1001       1  0 09:06 ?        00:00:00 /usr/local/postgres_exporter/postgres_exporter
postgres    4350       1  0 14:59 ?        00:00:00 /u01/app/postgres/product/16.4/dbhome_1/bin/postgres -D /u01/app/postgres/pgdata -p 2024
postgres    4351    4350  0 14:59 ?        00:00:00 postgres: logger
postgres    4352    4350  0 14:59 ?        00:00:00 postgres: checkpointer
postgres    4353    4350  0 14:59 ?        00:00:00 postgres: background writer
postgres    4355    4350  0 14:59 ?        00:00:00 postgres: walwriter
postgres    4356    4350  0 14:59 ?        00:00:00 postgres: autovacuum launcher
postgres    4357    4350  0 14:59 ?        00:00:00 postgres: logical replication launcher
root        5124    5083  0 16:32 pts/3    00:00:00 grep --color=auto postgres

检查wal_level:

1. postgres=# \dconfig wal_level
   
2. List of configuration parameters
   
3. Parameter |  Value  
   
4. -----------+---------
   
5. wal_level | replica
   
6. (1 row)

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检查逻辑复制槽：

1. postgres=# \x
   
2. Expanded display is on.
   
3. postgres=# SELECT * FROM pg_replication_slots;
   
4. (0 rows)

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1. postgres=# \x
   
2. Expanded display is on.
   
3. postgres=# select * from pg_publication;
   
4. (0 rows)

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1. postgres=# select * from pg_subscription;
   
2. (0 rows)
   

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