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A repo of documentation, notes, summaries, fixes and solutions on software development and related topics

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Thu, 28 May 2026 15:29:28 +0000

About docs.fixes.co.za

This website is the documentation archive for Fixes.co.za: a repo of documentation, notes, summaries, fixes and solutions on softw...

The Snowball: Warren Buffett and the Business of Life

Fri, 15 May 2026 00:00:00 +0000

The Snowball: Warren Buffett Wisdom Notes

Core Lessons

Compounding Is the Main Idea

Buffett's life is built around one idea: a small snowball, ro...

Elastic in Action Notes

Wed, 19 Feb 2025 00:00:00 +0000

Elasticsearch In Action

4. Mapping

4.1 Mapping Overview

Mapping is the schema definition

In Elasticsearch you do not need to define the schema/m...

Astronomy Notes

Sun, 16 Jun 2024 00:00:00 +0000

Astronomy notes

These are combined notes from the previous astronomy articles.

Big Bang

Before 1929, many believed the universe was static and eterna...

Black Code Format - Set Line Length

Thu, 16 May 2024 00:00:00 +0000

In the root of your project add a file called pyproject.toml with the content:

[tool.black]line-length = 80

or for longer lines:

[tool.blac...

Postgres Caveats

Mon, 22 Apr 2024 00:00:00 +0000

Integer Autoincrement ID

Using Integer as the id field for a table is bad because changing it to BIGINT needs downtime or tricky constraint changes.

...

Compound Statements

Mon, 22 Apr 2024 00:00:00 +0000

Compound statements and comparisons allow comparisons of 2 or more things in a single statement.

>>> x = 5>>> 3 < x < 7True

or:

>>> Fals...

Remove and add indexes programmatically

Tue, 12 Dec 2023 00:00:00 +0000

Indexes can made insert and update operations slow.One may want to remove them - do the inserts/updates - then add them back once complete for performance r...

AWS Database Migration Service

Thu, 12 Oct 2023 00:00:00 +0000

What is AWS Database Migration Service?

At a basic level, AWS DMS is a server (Elastic Compute Cloud (Amazon EC2) in the AWS Cloud that runs replication ...

Python Sockets How To

Wed, 30 Aug 2023 00:00:00 +0000

Python Sockets How To

Terms:

INET - IPv4 Socket
STREAMING - TCP Socket

Types of sockets:

"client" socket - an endpoint of a conversation. A clien...

Allow Remote Postgres Cluster Access

Fri, 02 Jun 2023 00:00:00 +0000

Allow Remote Postgres Cluster Access

Listen on remote ips

sudo vim /etc/postgresql/<version>/main/postgresql.conf

Set:

listen_ad...

Revert a Merge

Mon, 15 May 2023 00:00:00 +0000

If you are in the middle of a merge - the merge has not been committed and there are merge conflicts that are being resolved.The merge can be aborted with:...

Dependent Origination

Sun, 07 May 2023 00:00:00 +0000

If one can imagine a beach of white sand, then the stretch looks continuous.On closer examination, though, one finds that the beach is made up of an uncount...

Check if Gzip is Enabled

Tue, 02 May 2023 00:00:00 +0000

Checking if Gzip Compression is Enabled

You need to tell the server than you can accept gzipped content.That is done with request headers:

Do not a...

Joblib and Memoization

Mon, 01 May 2023 00:00:00 +0000

Memoization

The memoization pattern - is a caching method.It caches the result of inputs so when the same inputs are used again the calculation/work is ...

10 Python Performance Tips

Thu, 20 Apr 2023 00:00:00 +0000

DRAFT

Readability counts

Use discretion. Oftentimes code being obvious to the reader is a greater gain than nanoseconds of performance. Not always.

I...

Celery vs Faust

Mon, 17 Apr 2023 00:00:00 +0000

Celery vs Faust

Celery provides tooling for Python to process large amounts of data on queues.Looking through the [celery backends and brokers](https://...

DBA General Health Tasks

Fri, 10 Feb 2023 00:00:00 +0000

Postgres DBA General Health Tasks

Set a statement timeout

Long running queries should be offloaded to other systems or read replicas. Transactional sy...

Simple Core Path of Buddha

Mon, 30 Jan 2023 00:00:00 +0000

Live well

Stop alcohol, caffeine, drugs and smoking (anything causing heedlessness)
Stop killing
Stop stealing
Stop speech which is false, divis...