# Query Performance Gauge

This is a little script to measure the performance of queries against a Trino or MySQL instance. You can use it to run
several queries and measure how long it takes for results to come back to your local machine.

## How to use

1. First, you need to install the package in your Python installation or a virtual environment. If you have our Google 
Drive Shared Drive replicated locally, you can do it like this:

```commandline
pip install "git+file:///g:\shared drives\data drive\90 useful\trino_query_performance_gauge@master"```
```

2. After, you need to make a config file. See below details on how to compose one.

3. Once you have your config file ready, run the following command from the terminal.

```commandline
measure_query_performance --config my_config_file.json
```

## Composing a config file

You can take a look at the `example-config.json` in this repository.

A few notes:
- The valid engines are `"trino"` and `"mysql"`.
- You can place as many queries as you would like in the `queries_to_measure` list.
- I advice you to make the first query a silly, fast query such as `SELECT 1` to validate your connection and 
  quickly confirm that everything is set up properly.


## A few more details

- Queries are run sequentially, as in the second query will only start after the first query is finished.
- For this to work, your local machine must have access and permission to the connection you are targeting, so 
  remember to set up VPNs and other necessary configs properly.