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How to diagnose max_locks_per_transaction is about to be exhausted?

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Hello!

max_locks_per_transaction enforces some restriction: the_locks_count <= the_threshold

the_threshold is max_locks_per_transaction * (max_connections + max_prepared_transactions), the documentation is quite clear.

What is the_locks_count?
In docs we see "no more than this many distinct objects can be locked at any one time". What kinds of locks should we include? does the limit really restricts *distinct* objects count and what is the distinction key for every lock kind?

What should one change in the following query to make it show the value limited by the_threshold? select count(distinct relation) + count(distinct (classid, objid)) from pg_locks

Best regads
  Alexey Bashtanov


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