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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_cache_hit.ex
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lib/queries/index_cache_hit.ex 

defmodule EctoPSQLExtras.IndexCacheHit do

  def title do

    "Calculates your cache hit rate for reading indexes"

  end



  def query do

"""

/* Calculates your cache hit rate for reading indexes */



SELECT

  relname AS name,

  idx_blks_hit AS buffer_hits,

  idx_blks_read AS block_reads,

  idx_blks_hit + idx_blks_read AS total_read,

  CASE (idx_blks_hit + idx_blks_read)::float

    WHEN 0 THEN 'Insufficient data'

    ELSE (idx_blks_hit / (idx_blks_hit + idx_blks_read)::float)::text

  END ratio

FROM

  pg_statio_user_tables

ORDER BY

  idx_blks_hit / (idx_blks_hit + idx_blks_read + 1)::float DESC;

"""

  end

end