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Webinar Q&A: Percona XtraDB Cluster 101

 | December 19, 2017 |  Posted In: High-availability, MySQL, Percona XtraDB Cluster, Technical Webinars

InnoDB Performance Optimization

In this blog, we will answer questions from our webinar on Percona XtraDB Cluster 101. Recently (7 Dec 2017) I presented a webinar about Percona XtraDB Cluster 101. Firstly, thanks to all the attendees: we had a great webinar with quite some interesting questions and feedback. Through this blog, I’ll answer most of the questions […]

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Demystifying Sequence Numbers (seqno) in Percona XtraDB Cluster

 | December 14, 2017 |  Posted In: High-availability, MySQL, Percona XtraDB Cluster

sequence numbers

In this blog post, we’ll look at how sequence numbers work in Percona XtraDB Cluster. Introduction Percona XtraDB Cluster uses multiple sequence numbers (seqno), each having a special role to play. Let’s try to understand the significance of each sequence number. global_seqno An active Percona XtraDB Cluster cluster has multiple write-sets (transactions) generated from one […]

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Webinar Thursday, December 7, 2017: Percona XtraDB Cluster (PXC) 101

and  | December 6, 2017 |  Posted In: High-availability, Insight for DBAs, MySQL, Technical Webinars

Percona XtraDB Cluster

Join Percona’s Software Engineer (PXC Lead), Krunal Bauskar as he presents Percona XtraDB Cluster 101 on Thursday, December 7, 2017, at 7:00 am PST / 10:00 am EST (UTC-8). Tags: Percona XtraDB Cluster, MySQL, High Availability, Clustering Experience Level: Beginner Percona XtraDB Cluster (PXC) is a multi-master solution that offers virtual synchronous replication among clustering […]

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Faster Node Rejoins with Improved IST performance

and  | July 21, 2017 |  Posted In: MySQL, Percona XtraDB Cluster

IST Performance

In this blog, we’ll look at how improvements to Percona XtraDB Cluster improved IST performance. Introduction Starting in version 5.7.17-29.20 of Percona XtraDB Cluster significantly improved performance. Depending on the workload, the increase in throughput is in the range of 3-10x. (More details here). These optimization fixes also helped improve IST (Incremental State Transfer) performance. This […]

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Differences in PREPARE Statement Error Handling with Binary and Text Protocol (Percona XtraDB Cluster / Galera)

 | July 5, 2017 |  Posted In: Insight for DBAs, MySQL, Percona XtraDB Cluster

PREPARE Statement

In this blog, we’ll look at the differences in how a PREPARE statement handles errors in binary and text protocols. Introduction Since Percona XtraDB Cluster is a multi-master solution, when an application executes conflicting workloads one of the workloads gets rolled back with a DEADLOCK error. While the same holds true even if you fire […]

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Improved wsrep-stages and related instrumentation in Percona XtraDB Cluster

 | April 24, 2017 |  Posted In: MySQL, Percona XtraDB Cluster, XtraDB Cluster

wsrep-stages

In this blog post, we’ll look at how we’ve improved wsrep-stages and related instrumentation in Percona XtraDB Cluster. Introduction When you execute a workload and need to find out what the given thread is working on, “SHOW PROCESSLIST” comes to the top of your mind. It is an effective way to track the thread status. We […]

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Percona XtraDB Cluster Transaction Replay Anomaly

 | April 23, 2017 |  Posted In: MySQL, Percona XtraDB Cluster, XtraDB Cluster

wsrep-stages

In this blog post, we’ll look at a transaction replay anomaly in Percona XtraDB Cluster. Introduction Percona XtraDB Cluster/Galera replays a transaction if the data is non-conflicting but, the transaction happens to have conflicting locks. Anomaly Let’s understand this with an example: Let’s assume a two-node cluster (node-1 and node-2) Base table “t” is created […]

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BEWARE: Increasing fc_limit can affect SELECT latency

 | April 22, 2017 |  Posted In: MySQL, Percona XtraDB Cluster, XtraDB Cluster

SELECT Latency

In this blog post, we’ll look at how increasing the fc_limit can affect SELECT latency. Introduction Recent Percona XtraDB Cluster optimizations have exposed fc_limit contention. It was always there, but was never exposed as the Commit Monitor contention was more significant. As it happens with any optimization, once we solve the bigger contention issues, smaller […]

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