Max locks

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От James Sewell
Тема Max locks
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Msg-id CAANVwEvRv0ZKiZvVeFJu=_d2XzBwv+MhidzvUWF6L6+of_DBhw@mail.gmail.com
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Ответы Re: Max locks  (Peter Eisentraut <peter.eisentraut@2ndquadrant.com>)
Список pgsql-general
Hello all,

I have a system which is giving me the log hint to increase max_locks_per_transaction. This is somewhat expected due to the workload - but what I can't understand is the numbers:

Based on the docs I calculate my theoretical max locks as:

max_locks_per_transaction * (max_connections + max_prepared_transactions) 
256 * (600 + 0) = 153600

However, looking at my Prometheus monitoring (polling every 15s) which does a SELECT from pg_locks and groups by mode I can see there are over 500K AccessShareLocks consistently (up to around 570K at peak).

How is this possible???

Cheers,

James Sewell,


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