diff --git a/README.md b/README.md
index 9a7db94d..9e121796 100644
--- a/README.md
+++ b/README.md
@@ -178,7 +178,7 @@ ALTER USER postgres_exporter SET SEARCH_PATH TO postgres_exporter,pg_catalog;
 -- If deploying as non-superuser (for example in AWS RDS), uncomment the GRANT
 -- line below and replace <MASTER_USER> with your root user.
 -- GRANT postgres_exporter TO <MASTER_USER>;
-CREATE SCHEMA postgres_exporter;
+CREATE SCHEMA IF NOT EXISTS postgres_exporter;
 GRANT USAGE ON SCHEMA postgres_exporter TO postgres_exporter;
 
 CREATE FUNCTION get_pg_stat_activity() RETURNS SETOF pg_stat_activity AS
@@ -187,19 +187,19 @@ LANGUAGE sql
 VOLATILE
 SECURITY DEFINER;
 
-CREATE VIEW postgres_exporter.pg_stat_activity
+CREATE OR REPLACE VIEW postgres_exporter.pg_stat_activity
 AS
   SELECT * from get_pg_stat_activity();
 
 GRANT SELECT ON postgres_exporter.pg_stat_activity TO postgres_exporter;
 
-CREATE FUNCTION get_pg_stat_replication() RETURNS SETOF pg_stat_replication AS
+CREATE OR REPLACE FUNCTION get_pg_stat_replication() RETURNS SETOF pg_stat_replication AS
 $$ SELECT * FROM pg_catalog.pg_stat_replication; $$
 LANGUAGE sql
 VOLATILE
 SECURITY DEFINER;
 
-CREATE VIEW postgres_exporter.pg_stat_replication
+CREATE OR REPLACE VIEW postgres_exporter.pg_stat_replication
 AS
   SELECT * FROM get_pg_stat_replication();