Items tagged postgresql in 2018
Filters: Year: 2018 × postgresql × Sorted by date
Optimizing Django Admin Paginator. The Django admin paginator uses a count(*) to calculate the total number of rows, so it knows how many pages to display. This makes it unpleasantly slow over large datasets. Haki Benita has an ingenious solution: drop in a custom paginator which uses the PostgreSQL “SET LOCAL statement_timeout TO 200” statement first, then if a timeout error is raised returns 9999999999 as the count instead. This means small tables get accurate page counts and giant tables load display in the admin within a reasonable time period. # 6th November 2018, 6:17 pm
Experiences with running PostgreSQL on Kubernetes (via) Fascinating interview that makes a solid argument for the idea that running stateful data stores like PostgreSQL or Cassandra is made harder, not easier when you add an orchestration tool like Kubernetes into the mix. # 13th August 2018, 2:30 pm
mycli. Really neat auto-complete enabled MySQL terminal client, built using the excellent python-prompt-toolkit. Has a sister-project for PostgreSQL called pgcli. # 11th June 2018, 7:08 pm
Showdown: MySQL 8 vs PostgreSQL 10 (via) MySQL 8 makes comparisons between PostgreSQL and MySQL far more interesting, as it closes some of the key feature gaps. Meanwhile the PostgreSQL replication story (long one of MySQL’s key advantages) has improved dramatically in recent versions. This article offers a useful overview of the current differences, including diving into some of the less obvious implementation details that differ between the two. # 23rd May 2018, 5:02 pm
Touring a Fast, Safe, and Complete(ish) Web Service in Rust. Brandur’s notes from building a high performance web service in Rust, using PostgreSQL via the Diesel ORM and the Rust actix-web framework which provides Erlang-style actors and promise-based async concurrency. # 28th March 2018, 3:47 pm
User-defined Order in SQL (via) This is a fun intellectual exercise: how can one efficiently implement a user-defined order in a SQL table? The obvious initial approach is to have an integer position column, but this means every subsequent row must be updated when an item changes position. Joe “begriffs” Nelson explores some clever alternatives, including floating point or decimal positions (allowing new items to be inserted at a midpoint between existing positions) and a new custom rational number type he buiIt as a PostgreSQL extension. # 21st March 2018, 2:07 pm
Conditional aggregation in Django 2.0 (via) I hadn’t realised how clever this new Django ORM feature by Tom Forbes is. It lets you build an aggregation against a subset of rows, e.g. Client.objects.aggregate(regular=Count(’pk’, filter=Q(account_type=Client.REGULAR)))—then if you are using PostgreSQL it translates it into a fast FILTER WHERE clause, while other databases emulate the same behaviour using a CASE statement. # 3rd February 2018, 9:38 pm
How the Citus distributed database rebalances your data. Citus is a fascinating implementation of database sharding built on top of PostgreSQL primitives. PostgreSQL 10 introduced extremely flexible logical replication—in this post Craig Kerstiens explains how Citus use this new ability to re-balance shards (e.g. when you move from two to four physical PostgreSQL nodes) without downtime. # 1st February 2018, 10:50 pm
django-postgres-copy (via) Really neat Django queryset add-on which exposes the PostgreSQL COPY statement for importing (and exporting) CSV data. MyModel.objects.from_csv(“filename.csv”). Built by the team of data journalists at the California Civic Data Coalition. # 26th January 2018, 12:43 am