How to detect query which holds the lock in Postgres?

How to detect query which holds the lock in Postgres?

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Select unlocked row in Postgresql

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Controlling duration of PostgreSQL lock waits

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SQL semantics for "FOR UPDATE" & "JOIN"

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How do I use string as a key to PostgreSQL advisory lock?

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When does "select for update" lock and unlock?

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Rails ActiveRecord - how can I lock a table for reading?

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Predicate locking in PostgreSQL 9.2.1 with Serializable isolation

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Handling race conditions in PostgreSQL

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PostgreSQL constraint using prefixes

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Does Rails `with_lock` block reads?

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Timeout on advisory locks in postgresql

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How to use tcp_keepalives settings in Postgresql?

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PSQLException and lock issue when trigger added on table

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Deleting many rows without locking them

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