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multiple process of PostgreSQL running on the same port and same directory - Mailing list pgsql-admin

From aven pan
Subject multiple process of PostgreSQL running on the same port and same directory
Date
Msg-id CAKAKoqf_bqvqyknj8n-cW6-3aUGc5j=t6Yy99psc8J3dEmVXqw@mail.gmail.com
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This is the processes I catched:

postgres 5260 0.0 0.0 1224332 37232 ? S Jul13 0:13 \
/opt/pg94/bin/postgres -D /export/pg940_data

postgres 31193 0.0 0.0 1224332 976 ? Ss 00:20 0:00 \
/opt/pg94/bin/postgres -D /export/pg940_data

I found the similar question: ps output shows multiple instances of PostgreSQL running on the same port , but I wanna konw when to fork a postmaster process, and what does it do.

PostgreSQL version:
postgres=# select version();
                                                   version                                                   
--------------------------------------------------------------------------------------------------------------
 PostgreSQL 9.4.4 on x86_64-unknown-linux-gnu, compiled by gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-3), 64-bit
(1 row)

Thanks.

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