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Ecto PostgreSQL database performance insights. Locks, index usage, buffer cache hit ratios, vacuum stats and more.

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ecto_psql_extras lib queries outliers.ex
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lib/queries/outliers.ex 

defmodule EctoPSQLExtras.Outliers do

  @behaviour EctoPSQLExtras



  def info do

    %{

      title: "10 queries that have longest execution time in aggregate",

      order_by: [total_time: :desc],

      limit: 10,

      columns: [

        %{name: :query, type: :string},

        %{name: :exec_time, type: :interval},

        %{name: :prop_exec_time, type: :string},

        %{name: :ncalls, type: :string},

        %{name: :sync_io_time, type: :interval}

      ]

    }

  end



  def query do

    """

    /* 10 queries that have longest execution time in aggregate */



    SELECT query AS qry,

    interval '1 millisecond' * total_time AS exec_time,

    to_char((total_time/sum(total_time) OVER()) * 100, 'FM90D0') || '%'  AS prop_exec_time,

    to_char(calls, 'FM999G999G999G990') AS ncalls,

    interval '1 millisecond' * (blk_read_time + blk_write_time) AS sync_io_time

    FROM pg_stat_statements WHERE userid = (SELECT usesysid FROM pg_user WHERE usename = current_user LIMIT 1)

    ORDER BY total_time DESC

    LIMIT 10;

    """

  end

end