I found this command for solving the lock file "" already exists in postgresql
You could stop your server doing :

pg_ctl -D /usr/local/var/postgres stop

Where did the command should be run?
I was tried to execute using run & command prompt not working.I have a error message please find the attachment file.
Tamilarasu PAsked:
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lcohanDatabase AnalystCommented:
you said "I was tried to execute using run & command prompt not working." but the error you posted is about the  “” already exists so your server is already running and please post the actual error you're getting when running "pg_ctl -D /usr/local/var/postgres stop".

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