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Nikolay Samokhvalov: Zero-downtime Postgres schema migrations need this: lock_timeout and retries

23. September 2021 - 11:06
Deploying DB schema changes in heavily loaded systems is challenging. In this article, we explore one of the challenges - how to avoid situations when DDLs get blocked, wait to acquire a lock, and during that, start blocking other sessions.

Luca Ferrari: Restarting a sequence: how hard could it be? (PostgreSQL and Oracle)

23. September 2021 - 2:00

How hard could it be to reset a sequence?

Restarting a sequence: how hard could it be? (PostgreSQL and Oracle)

One reason I like PostgreSQL so much is that it makes me feel at home: it has a very consistent and coherent interface to its objects. An example of this, is the management of sequences: ALTER SEQUENCE allows you to modify pretty much every detail about a sequence, in particular to restart it from its initial value.
Let’s see this in action:



Franck Pachot: when you have millions of insert statements in a file...

22. September 2021 - 23:18

Let's say you have a script of one million of insert statements with literal values. Of course, this is a bad idea. SQL is language, not a data exchange format. You should have a file to import with COPY, with all values as CSV for example. Or at least, if you are a big fan of INSERT statements, have thousands of row values in it. Or prepare the statement with parameters and call with each parameter.

Bo Peng: Pgpool-II Configuration Parameters - enable_shared_relcache

22. September 2021 - 17:06

In the previous post, I explained how to control the client connections by using reserved_connections parameter. In this post I would like to introduce how to use shared relation cache to improve performance.

Hans-Juergen Schoenig: Building an Oracle to PostgreSQL migrator: Lessons learned

22. September 2021 - 10:00

Moving from Oracle to PostgreSQL has become a popular sport, widely adopted by many who want to free themselves from license costs, hefty support costs and also technical limitations on the Oracle side. The same is true for people moving from MS SQL and other commercial platforms to PostgreSQL. However, my impression is that moving from Oracle to PostgreSQL is by far the most popular route.

Craig Kerstiens: Postgres 14: It's The Little Things

21. September 2021 - 20:46

A lot of years Postgres will have some big pillar or theme to the release. Often this is thought of after the fact.

Bo Peng: Pgpool-II Configuration Parameters - reserved_connections

21. September 2021 - 19:57

Pgpool-II is a feature-rich PostgreSQL cluster management tool. To determine which configuration is best for your database cluster, you need to understand the purpose of the parameters. Since this blog, I will introduce several effective parameters to improve performance.

In this blog, I will explain reserved_connections parameter and how to configure this parameter.

Andreas 'ads' Scherbaum: Michael Goldberg

20. September 2021 - 16:00
PostgreSQL Person of the Week Interview with Michael Goldberg: I’m from a small town located in the Ural mountains. In 1991 our family moved to Israel. I live in Tel Aviv since then.

David Z: A quick test for postgres_fdw batch insertion

18. September 2021 - 1:21
1. Overview

In my previous blog, I briefly walked through how the bulk/batch insertion was done for postgres_fdw in PG14. In this blog, I am going to run some basic tests to compare the performance for before and after the batch insertion was introduced in postgres_fdw, so that we can have a general idea about whether this feature makes any difference.

Onder Kalacı: What’s new in the Citus 10.2 extension to Postgres

17. September 2021 - 17:23

Citus 10.2 is out! If you are not yet familiar with Citus, it is an open source extension to Postgres that transforms Postgres into a distributed database—so you can achieve high performance at any scale. The Citus open source packages are available for download.

Lætitia AVROT: pglog, a flexible and simple log analyzer

17. September 2021 - 2:00
As a consultant, I have to analyze various databases daily. I need to be able to grasp what the major problems are quickly and find the best way to solve them. Analyzing logs is a very efficient way to find problems. I was frustrated with the existing tools as I couldn’t deep dive into a problem to find more accurate data related to that problem only. That’s where I decided to use SQL to analyze my customers' logfiles.

Michał Mackiewicz: Broken indexes after Linux upgrade

16. September 2021 - 11:15

Upgrading one’s operating system to new major version is an important system maintenance task and it’s usually a good thing. It brings new features, security improvements, access to newer packages and so on. Sometimes it doesn’t go that smoothly, for example the updated system will refuse to start. But upgrading the OS running a Postgres cluster and involving a glibc library version update, or migrating a database to another machine running another OS (and glibc) version poses a little known, but very significant risk…

Pavlo Golub: PostgreSQL schedulers: comparison table

16. September 2021 - 10:00

Hello, my name is Pavlo Golub, and I am a scheduler addict. That began when I implemented pg_timetable for PostgreSQL. I wrote a lot about it. In this post, I want to share the result of my investigations on the schedulers available for PostgreSQL.

Amit Kapila: Logical Replication Improvements In PostgreSQL-14

15. September 2021 - 13:51
In the upcoming release of PostgreSQL-14, we will see multiple enhancements in Logical Replication which I hope will further increase its usage. This blog is primarily to summarize and briefly explain all the enhancements in Logical Replication.
Decoding of large transactions:

Yugo Nagata: Tuple Duplicates Support in Incremental View Maintenance

15. September 2021 - 2:00
Introduction

In the previous posts ([1], [2], [3]), I have explained the Incremental View Maintenance (IVM) that we are proposing as a new feature of PostgreSQL.

David Kohn: How percentile approximation works (and why it's more useful than averages)

14. September 2021 - 17:41

In my recent post on time-weighted averages, I described how my early career as an electrochemist exposed me to the importance of time-weighted averages, which shaped how we built them into TimescaleDB hyperfunctions.

Álvaro Hernández: Respecting the majority, questioning the status quo as a minority

14. September 2021 - 16:49
Respecting the majority, questioning the status quo as a minority

Yesterday, the PostgreSQL Core Team launched an unprecedented attack on Fundación PostgreSQL as a whole and individually against Alvaro Hernandez. Fundación PostgreSQL responded promptly.

Hans-Juergen Schoenig: PostgreSQL: Create indexes after bulk loading

14. September 2021 - 10:00

Over the years, many of our PostgreSQL clients have asked whether it makes sense to create indexes before – or after – importing data. Does it make sense to disable indexes when bulk loading data, or is it better to keep them enabled? This is an important question for people involved in data warehousing and large-scale data ingestion. So let’s dig in and figure it out:

Nikolay Samokhvalov: DLE 2.5: Better data extraction for logical mode and configuration improvements

14. September 2021 - 2:00
Now it is possible to dump/restore multiple databases at the same time and use different pg_dump formats and compression formats of plain-text dump. DLE and related products configuration structure was significantly reworked and require manual action to migrate to the new version.

Anatoly Stansler: DLE 2.5: Better data extraction for logical mode and configuration improvements

14. September 2021 - 2:00
Now it is possible to dump/restore multiple databases at the same time and use different pg_dump formats and compression formats of plain-text dump. DLE and related products configuration structure was significantly reworked and require manual action to migrate to the new version.

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