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ecto_psql_extras

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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 index_usage.ex
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lib/queries/index_usage.ex 

defmodule EctoPSQLExtras.IndexUsage do

  def title do

    "Index hit rate (effective databases are at 99% and up)"

  end



  def query do

"""

/* Index hit rate (effective databases are at 99% and up) */



SELECT relname,

   CASE idx_scan

     WHEN 0 THEN 'Insufficient data'

     ELSE (100 * idx_scan / (seq_scan + idx_scan))::text

   END percent_of_times_index_used,

   n_live_tup rows_in_table

 FROM

   pg_stat_user_tables

 ORDER BY

   n_live_tup DESC;

"""

  end

end