diff --git a/fhem/contrib/dblog/db_create_sqlite.sql b/fhem/contrib/dblog/db_create_sqlite.sql
index b071b1bde..c5a4c08c9 100644
--- a/fhem/contrib/dblog/db_create_sqlite.sql
+++ b/fhem/contrib/dblog/db_create_sqlite.sql
@@ -1,3 +1,21 @@
+###################################################################
+# Usage:
+# ======
+#
+# - Open a terminal session
+# - goto a directory where the datbase should be created
+# - create a new database:
+#   sudo sqlite3 <file>         (e.g./opt/fhem/fhem.db)
+# 
+# - change owner and user rights of the new file
+#
+#   sudo chown fhem /opt/fhem/fhem.db
+#   sudo chmod 600 /opt/fhem/fhem.db
+#
+# - execute the statements shown below
+#
+###################################################################
+PRAGMA auto_vacuum = FULL;
 CREATE TABLE history (TIMESTAMP TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP, DEVICE varchar(64), TYPE varchar(64), EVENT varchar(512), READING varchar(64), VALUE varchar(128), UNIT varchar(32));
 CREATE TABLE current (TIMESTAMP TIMESTAMP, DEVICE varchar(64), TYPE varchar(64), EVENT varchar(512), READING varchar(64), VALUE varchar(128), UNIT varchar(32));
 CREATE INDEX Search_Idx ON `history` (DEVICE, READING, TIMESTAMP);