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3 postgres processes

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Hi,

After issuning initdb and starting the postgres server, I checked for processes running, expecting to see just one:
 
postgres  4926  4924   0 14:44:52 ?           0:00 /usr/postgres/8.2/bin/postgres
postgres  4924     1   0 14:44:52 pts/1       0:00 /usr/postgres/8.2/bin/postgres
postgres  4929  4850   0 14:44:56 pts/1       0:00 grep postgres
postgres  4928  4850   0 14:44:56 pts/1       0:00 ps -ef
postgres  4927  4924   0 14:44:52 ?           0:00 /usr/postgres/8.2/bin/postgres


Only one of them is in postmaster.pid. What the other ones are for?

 more /pg_data/postmaster.pid 
4924
/pg_data
  5432001        31


Thanks,

-----'\/\/\/`v^v^v^v^v^v^v----------------------------------------------------------------------------
Nina Markova, 
Database Analyst                    / Analyst de base de données
(613) 992-3753       facsimile      / télécopieur (613) 992-8836
nmarkova@xxxxxxxxxxx

Geological Survey of Canada         / Commission géologique du Canada
Natural Resources Canada            / Ressources naturelles Canada
Government of Canada                / Gouvernement du Canada
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