[Solved] Postgres CPU high usage after hours

How to optimize this SQL query?

In case you have your own slow SQL query, you can optimize it automatically here.

For the query above, the following recommendations will be helpful as part of the SQL tuning process.
You'll find 3 sections below:

  1. Description of the steps you can take to speed up the query.
  2. The optimal indexes for this query, which you can copy and create in your database.
  3. An automatically re-written query you can copy and execute in your database.
The optimization process and recommendations:
  1. Create Optimal Indexes (modified query below): The recommended indexes are an integral part of this optimization effort and should be created before testing the execution duration of the optimized query.
Optimal indexes for this query:
CREATE INDEX pg_locks_idx_transactionid_pid ON "pg_catalog"."pg_locks" ("transactionid","pid");
CREATE INDEX pg_activity_idx_pid ON "pg_catalog"."pg_stat_activity" ("pid");
The optimized query:
        bl.pid AS blocked_pid,
        a.usename AS blocked_user,
        ka.query AS current_or_recent_statement_in_blocking_process,
        ka.state AS state_of_blocking_process,
        now() - ka.query_start AS blocking_duration,
        kl.pid AS blocking_pid,
        ka.usename AS blocking_user,
        a.query AS blocked_statement,
        now() - a.query_start AS blocked_duration 
        pg_catalog.pg_locks bl 
        pg_catalog.pg_stat_activity a 
            ON a.pid = bl.pid 
        pg_catalog.pg_locks kl 
            ON kl.transactionid = bl.transactionid 
            AND kl.pid != bl.pid 
        pg_catalog.pg_stat_activity ka 
            ON ka.pid = kl.pid 
        NOT bl.GRANTED

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* original question posted on StackOverflow here.