Often users come to us with incidents of database crashes due to OOM Killer. The Out Of Memory killer terminates PostgreSQL processes and remains the top reason for most of the PostgreSQL database crashes reported to us. There could be multiple reasons why a host machine could run out of memory, and the most common problems are: Poorly tuned memory on the host machine. A high value of work_mem is
See part one of this series here. This post is part two of my series “Assessing MySQL Performance Amongst AWS Options”, taking a look at how current Amazon RDS services – Amazon Aurora and Amazon RDS for MySQL – compare with Percona Server with InnoDB and RocksDB engines on EC2 instances. This time around, I am reviewing the total cost of one test run for each database as well as seeing which data
At recent conferences, we have received a curious question from users who have used Oracle in the past and are now using PostgreSQL: “Do we have hypothetical indexes in PostgreSQL ?“. The answer to that question is YES. The true meaning of hypothetical is imaginary but not real. We can try creating indexes that are imaginary for the PostgreSQL optimizer which don’t exist in reality. Let’s look at
There are three different ways ProxySQL can direct traffic between your application and the backend MySQL services. Locally, on the MySQL servers. Between the MySQL servers and the application. Colocated on the application servers themselves.Without going through too much detail – each has its own limitations. In the first form, the application needs to know about all MySQL servers at any given po
In this blog post, I’ll provide some guidance on how to choose the MySQL innodb_log_file_size. Like many database management systems, MySQL uses logs to achieve data durability (when using the default InnoDB storage engine). This ensures that when a transaction is committed, data is not lost in the event of crash or power loss. MySQL’s InnoDB storage engine uses a fixed size (circular) Redo log sp
This blog compares how PostgreSQL and MySQL handle millions of queries per second. Anastasia: Can open source databases cope with millions of queries per second? Many open source advocates would answer “yes.” However, assertions aren’t enough for well-grounded proof. That’s why in this blog post, we share the benchmark testing results from Alexander Korotkov (CEO of Development, Postgres Professio
In this blog post, I’ll provide my thoughts about Consul for ProxySQL service discovery and automation. I approached Consul recently while looking for a service discovery and configuration automation solution for ProxySQL. My colleague Nik Vyzas wrote a great post on this topic, and I suggest you read it. I wrote this article to share my first impressions of Consul (for whomever it might interest)
Amazon Aurora - Looking Deeper
Recently my colleague (by Percona) Yves Trudeau and colleague (by industry) Marco Tusa published their materials on Amazon Aurora. Indeed, Amazon Aurora is a hot topic these days, and we have a stream of customer inquiries regarding this technology. I’ve decided to form my own opinion, and nothing is better than a personal, hands-on experience, which I am going to share. The materials I will refer
All of Percona’s open-source software products, in one place, to download as much or as little as you need.
Even with software like Percona Xtrabackup, logical backups remain an important component of a thorough backup strategy. To gather a logical backup in a timely fashion we rely on a tool called mydumper. In the Percona Managed Services department we’re lucky enough to have one of the project’s most active contributors and many of the latest features and bug fixes have been released to satisfy some
IMPORTANT: DON’T TRY THIS IN PRODUCTION. As demonstrated by Marko (see comments), it may corrupt your data. In a post, written a few months ago, I found that using EXT4 transactions with the “data=journal” mount option, improves the write performance significantly, by 55%, without putting data at risk. Many people commented on the post mentioning they were not able to reproduce the results and thu
Last week I hosted a webinar on using MySQL in the cloud for High Availability (HA) alongside 451 Research analyst Jason Stamper. You can watch the recording and also download the slides (free) here. Just click the “Register” button at the end of that page. We had several excellent questions and we didn’t have time to get to several of them in the allotted time. I’m posting them here along with th
All of Percona’s open-source software products, in one place, to download as much or as little as you need.
Please note, a more up-to-date follow-up post is here: Storing UUID and Generated Columns A few years ago Peter Zaitsev, in a post titled ““There is timestamp based part in UUID which has similar properties to auto_increment and which could be used to have values generated at the same point in time physically local in BTREE index.” For this post, I’ve rearranged the timestamp part of UUID (Univers
All of Percona’s open-source software products, in one place, to download as much or as little as you need.
All of Percona’s open source software products, in one place, to download as much or as little as you need.
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