diff --git a/lib/ansible/modules/database/postgresql/postgresql_membership.py b/lib/ansible/modules/database/postgresql/postgresql_membership.py
index 61a2049ed4a..05487bfae7e 100644
--- a/lib/ansible/modules/database/postgresql/postgresql_membership.py
+++ b/lib/ansible/modules/database/postgresql/postgresql_membership.py
@@ -271,7 +271,7 @@ def main():
     fail_on_role = module.params['fail_on_role']
     state = module.params['state']
 
-    conn_params = get_conn_params(module, module.params)
+    conn_params = get_conn_params(module, module.params, warn_db_default=False)
     db_connection = connect_to_db(module, conn_params, autocommit=False)
     cursor = db_connection.cursor(cursor_factory=DictCursor)
 
diff --git a/lib/ansible/modules/database/postgresql/postgresql_ping.py b/lib/ansible/modules/database/postgresql/postgresql_ping.py
index 53da87e123e..b0d060ad871 100644
--- a/lib/ansible/modules/database/postgresql/postgresql_ping.py
+++ b/lib/ansible/modules/database/postgresql/postgresql_ping.py
@@ -129,7 +129,7 @@ def main():
         server_version=dict(),
     )
 
-    conn_params = get_conn_params(module, module.params)
+    conn_params = get_conn_params(module, module.params, warn_db_default=False)
     db_connection = connect_to_db(module, conn_params, fail_on_conn=False)
 
     if db_connection is not None:
diff --git a/lib/ansible/modules/database/postgresql/postgresql_slot.py b/lib/ansible/modules/database/postgresql/postgresql_slot.py
index f122734f49a..d640df89f1d 100644
--- a/lib/ansible/modules/database/postgresql/postgresql_slot.py
+++ b/lib/ansible/modules/database/postgresql/postgresql_slot.py
@@ -231,7 +231,18 @@ def main():
     if immediately_reserve and slot_type == 'logical':
         module.fail_json(msg="Module parameters immediately_reserve and slot_type=logical are mutually exclusive")
 
-    conn_params = get_conn_params(module, module.params)
+    # When slot_type is logical and parameter db is not passed,
+    # the default database will be used to create the slot and
+    # the user should know about this.
+    # When the slot type is physical,
+    # it doesn't matter which database will be used
+    # because physical slots are global objects.
+    if slot_type == 'logical':
+        warn_db_default = True
+    else:
+        warn_db_default = False
+
+    conn_params = get_conn_params(module, module.params, warn_db_default=warn_db_default)
     db_connection = connect_to_db(module, conn_params, autocommit=True)
     cursor = db_connection.cursor(cursor_factory=DictCursor)
 
diff --git a/lib/ansible/modules/database/postgresql/postgresql_tablespace.py b/lib/ansible/modules/database/postgresql/postgresql_tablespace.py
index fc1c6ecf651..e0309654c6c 100644
--- a/lib/ansible/modules/database/postgresql/postgresql_tablespace.py
+++ b/lib/ansible/modules/database/postgresql/postgresql_tablespace.py
@@ -395,7 +395,7 @@ def main():
         module.fail_json(msg="state=absent is mutually exclusive location, "
                              "owner, rename_to, and set")
 
-    conn_params = get_conn_params(module, module.params)
+    conn_params = get_conn_params(module, module.params, warn_db_default=False)
     db_connection = connect_to_db(module, conn_params, autocommit=True)
     cursor = db_connection.cursor(cursor_factory=DictCursor)