DOC: added docs on sql-profiling

doc/devel/Benchmarking.md

@@ -32,6 +32,39 @@ A somewhat outdated script which executes a given query a number of times and th
 about the `TransactionBenchmark` readings (see below for more information about the transaction
 benchmarks) delivered by the server.
 
+
+### `sql_routine_measurement.py` 
+
+
+
+Simply call `./sql_routine_measurement.py` in the scripts directory. An sql
+file is automatically executed which enables the correct `performance_schema`
+tables. However, the performance_schema of mariadb needs to be enabled. Add
+`performance_schema=ON` to the configuration file of mariadb as it needs to be
+enabled on start up.
+This script expects the MariaDB server to be accessible on 127.0.0.1 with the default caosdb user
+and password (caosdb;random1234).
+
+#### Preparing docker setup for this:
+Change the docker-compose file to include the following for the mariadb service:
+```
+    networks:
+      # available on port 3306, host name 'sqldb'
+      - caosnet
+    ports:
+      - 3306:3306
+```
+Check it with `mysql -ucaosdb -prandom1234 -h127.0.0.1 caosdb`
+Set the schema to `ON` in `profiles/empty/custom/mariadb.conf.d/mariadb.cnf` or in the profile that you use.
+The `performance_schema` setting in the MariaDB server must be enabled, for example by setting
+this in the config files:
+```
+[mysqld]
+
+performance_schema=ON
+```
+Start the server.
+
 ### Benchmarking SQL commands ###
 
 MariaDB and MySQL have a feature to enable the logging of SQL queries' times.  This logging must be