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Vadim Yatsenko: Checkpoints

18. August 2022 - 11:49

A checkpoint is a point in the write-ahead log sequence at which all data files have been updated to reflect the information in the log. All data files will be flushed to disk.

When PostgreSQL starts after a crash, the server enters a recovery mode.

The disk after a crash is known to contain inconsistent information: data pages were written in different moments of time and contain data in different states.

Michael Goldberg: Write-Ahead Logging (WAL)

18. August 2022 - 11:48

Write-Ahead Logging (WAL) is a standard method for ensuring data integrity. Briefly, WAL‘s central concept is that changes to data files (where tables and indexes reside) must be written only after those changes have been logged, that is, after log records describing the changes have been flushed to permanent storage.

wei wang: How PostgreSQL 15 improved communication in logical replication

18. August 2022 - 3:02

Fujitsu has made some improvements to the communication of logical replication in PostgreSQL 15. Let me show you some details. 

Regina Obe: PostGIS 3.2.3, 3.1.7, 3.0.7, 2.5.8 Released

18. August 2022 - 2:00

The PostGIS development team is pleased to provide bug fix and performance enhancements 3.2.3, 3.1.7, 3.0.7, 2.5.8 for the 3.2, 3.1, 3.0, 2.5 stable branches.

Andrew Dunstan: Taming Buildfarm Logs

17. August 2022 - 17:47

 The output from running a buildfarm step is the output from running a command such as make check followed by any relevant log files that the step creates. These log files can get quite large, and in some cases there are quite a lot of them. Up to now the buildfarm server has just show all of this in an undifferentiated text blob. That has made finding out what might have gone wrong not impossible but not as easy as it could be, and there have been complaints about it over the years.

Craig Kerstiens: Learn Postgres at the Playground

17. August 2022 - 17:35

Today I'm excited to introduce a new place for devs to polish their Postgres skills, a Postgres playground from Crunchy Data. What is the playground? Put simply it is:

Yogesh Mahajan: AWS RDS PostgreSQL Deployment with pgAdmin 4

17. August 2022 - 14:45
This blog explains and provides a walkthrough of the pgAdmin AWS RDS deployment wizard which can be used to deploy a new PostgreSQL database in the Amazon AWS cloud and register it with pgAdmin so you can begin working with it immediately.

Pavlo Golub: Aliases for sub-SELECTS in FROM clause

17. August 2022 - 11:00
What are aliases in SQL?

SQL aliases in FROM clauses are used to give a result set a temporary name. A result set may be produced by a table or view name, sub-SELECT and/or VALUES clause. An alias is created with the AS keyword, but the grammar allows us to omit it. An alias only exists for the duration of that query and is often used to make result set and column names more readable.

Pavel Luzanov: PostgreSQL 16: part 1 or CommitFest 2022-07

17. August 2022 - 2:00

August is a special month in PostgreSQL release cycle. PostgreSQL 15 isn't even officially out yet, but the first CommitFest for the 16th release has already been held.

Let's compile the server and check out the cool new stuff! \dconfig server_version List of configuration parameters Parameter | Value ----------------+--------- server_version | 16devel

Notable features

There are 14 patches I want to talk about:

Egor Rogov: PostgreSQL 14 Internals, Part II

17. August 2022 - 2:00

I’m pleased to announce that Part II of the “PostgreSQL 14 Internals” book is available now. This part explores the purpose and design of the buffer cache and explains the need for write-ahead logging.

Please download the book freely in PDF. There are three more parts to come, so stay tuned!

Laurenz Albe: How to corrupt your PostgreSQL database

16. August 2022 - 11:00

Of course most people do not want to corrupt their databases. These people will profit from avoiding the techniques used in this article. But for some, it might be useful to corrupt a database, for example if you want to test a tool or procedure that will be used to detect or fix data corruption.

Joshua Drake: Recent blog updates

15. August 2022 - 20:36

When you have been around as long as Command Prompt, you are bound to forget blogs you wrote as well as the fact that those blogs are likely exceedingly outdated. I was recently doing a review of the Command Prompt Dead Sea Scrolls and have come across two that we have updated to be accurate for the modern times of PostgreSQL.

Andreas 'ads' Scherbaum: Hou Zhijie

15. August 2022 - 16:00
PostgreSQL Person of the Week Interview with Hou Zhijie: My name is Hou Zhijie. I am from China and live in Nanjing. I have been working at Nanjing Fujitsu Nanda Software Technology since graduation. I was working in the Fujitsu Enterprise PostgreSQL development and maintenance team, and now I work as part of the PostgreSQL open-source team at Fujitsu.

Gabriele Bartolini: Leverage a New Way to Import an Existing Postgres Database to Kubernetes

15. August 2022 - 15:37
Are you thinking about moving your PostgreSQL databases to Kubernetes but wondering how to do it? What about importing databases from RDS for PostgreSQL or another database as a service? [Continue reading...]

Paul Ramsey: Rise of the Anti-Join

15. August 2022 - 14:00

Find me all the things in set "A" that are not in set "B".

This is a pretty common query pattern, and it occurs in both non-spatial and spatial situations. As usual, there are multiple ways to express this query in SQL, but only a couple queries will result in the best possible performance.


The non-spatial setup starts with two tables with the numbers 1 to 1,000,000 in them, then deletes two records from one of the tables.