text: db._useDatabase("Healthcare")
  
  db.drug_matrix.drop()
  db.similarity1.drop()
  db.inv_norm.drop()
  db.similarity2.drop()
  db.drug_similarity.drop()
  
  db._create("drug_matrix")
  db._create("similarity1")
  db._create("inv_norm")
  db._create("similarity2")
  db._create("drug_similarity")
  
  db.drug_matrix.ensureIndex({type:"persistent", fields:["drug"]})
  db.drug_matrix.ensureIndex({type:"persistent", fields:["adverse_effect"]})
  db.similarity1.ensureIndex({type:"persistent", fields:["drug1"]})
  db.similarity1.ensureIndex({type:"persistent", fields:["drug2"]})
  db.inv_norm.ensureIndex({type:"persistent", fields:["drug1"]})
  db.inv_norm.ensureIndex({type:"persistent", fields:["drug2"]})
  db.similarity2.ensureIndex({type:"persistent", fields:["drug1"]})
  db.similarity2.ensureIndex({type:"persistent", fields:["drug2"]})
  db.drug_similarity.ensureIndex({type:"persistent", fields:["drug1"]})
  db.drug_similarity.ensureIndex({type:"persistent", fields:["drug2"]})
  