title: knowing that some entry located in the database
body: <p>I have some table in my database and i want to know if some entry really located there before i really go there .</p>
  
  <p>I have some fast application and i want to lower the number of calls against the database .</p>
  
  <p>I have there about 35.000 entries in the table.  </p>
  
  <p>I thought to have a bloom filter with some kind of hash function .</p>
  
  <p>Is it a good idea or you have other ideas what to do here ?</p>
  
  <p>Thanks .</p>