Chart on Micha Kops' Tech Notes

Micro Benchmarking your Tests using JUnit and JUnitBenchmarks

Sun, 10 Mar 2013 00:00:00 +0100

I recently stumbled upon a nice framework that allows to convert simple JUnit tests into micro benchmarks named JUnitBenchmarks.

It allows to set basic benchmark options and and to generate charts by adding some simple annotations and a test rule to your tests.

One might argue if it is wise to mix the aspects, testing and benchmarking and I’d agree for sure – nevertheless I think this framework can be handy sometimes so let’s create some benchmarks using JUnit and JUnitBenchmarks..

Helm Snippets

Mon, 01 Mar 2010 00:00:00 +0100

Common operations

Add Helm Repository

helm repo add NAME URL

e.g. for the Bitnami repository:

helm repo add bitnami https://charts.bitnami.com/bitnami                                                                                                                                                         1 ↵
"bitnami" has been added to your repositories

List Repositories

helm repo list                                                                                                                                                                                                 130 ↵
NAME    URL
bitnami https://charts.bitnami.com/bitnami

Searching in a Helm Repository

helm search repo wordpress
NAME                    CHART VERSION   APP VERSION     DESCRIPTION
bitnami/wordpress       15.2.30         6.1.1           WordPress is the world's most popular blogging ...
bitnami/wordpress-intel 2.1.31          6.1.1           DEPRECATED WordPress for Intel is the most popu...

Postgres Snippets

Mon, 01 Mar 2010 00:00:00 +0100

Get size of a table

SELECT pg_size_pretty(pg_total_relation_size('schemaname.tablename'));

Select unique combination of fields / tuples

SELECT DISTINCT ON(field1, field2) field1, field2
FROM thetable

Select rows where a combination of fields is not unique

SELECT columnA, columnB, count(*) AS count
FROM thetable
GROUP BY columnA, columnB
HAVING count(*) > 1

Search for rows with array containing value

Assuming, the field appointments has the type date[]

SELECT *
FROM mtable
WHERE appointments @> ARRAY['2023-09-19'::date]