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backup fail and concurrent cron question

 

Dear List,

i have a problem, dows anyone know a solution?

When i wanted to make a database backup it fails, in the PostgreSQL log
i found this error message:
ERROR:  could not obtain lock on row in relation "ir_cron"

It seems the fetchmail modul and cron locks the database. But if i shut
down the server how can i make a backup?


Another question, when starts up a cron server thread for a specific
database? At the frist user login, or when the application server
started up?
If the second one, than how knows the application server which database
it serves? For example if multiple application server uses the same
database server. Will a cron thread starts at every application server
process for every database, so concurrent processess will start?

Thanks,
Csaba