# Blog - Percona The Way is Open This is one page of public article previews, not the complete archive. Follow Next page to continue. Summaries are not the original full articles. ## Group Replication Beyond a Single Cluster: DC-DR with Percona (PS MySQL) Operator DevFeed: [Group Replication Beyond a Single Cluster: DC-DR with Percona (PS MySQL) Operator]() Original publisher: [Read original article]() Author: Anil Joshi Published: 2026-09-17T06:43:32Z Content type: tutorial Language: en Sources: [Blog - Percona]() Topics: [Replication](), [export](), [Percona Server for MySQL](), [configuration](), [Server](), [Kubernetes](), [Database]() Tags: [cloud](), [configuration](), [database-trends](), [featured](), [innodb-clusterset](), [insight-for-dbas](), [kubernetes](), [kubernetes-operators](), [mysql](), [mysql-group-replication](), [mysql-high-availability](), [mysql-replication](), [open-source](), [operator](), [percona-kubernetes-operators](), [percona-operator-for-mysql](), [percona-server-for-mysql](), [percona-software](), [replication](), [uncategorized](), [yaml]() ### AI overview This tutorial explains how to configure cross-site replication between two Percona Operator for MySQL clusters to create a ClusterSet environment for disaster recovery and switchover between data-center and disaster-recovery members. It covers deploying the clusters, retrieving endpoints and cluster names, transferring credentials, and initializing the DR cluster. ### Source excerpt A while ago, we discussed the cross-site replication feature of the Percona PXC operator. Recently, a similar cross-site replication feature was introduced in the Percona (PS MySQL) operator v1.2.0, a topology based on Group Replication/InnoDB Cluster. In this blog post, we will explore how to add a DR Cluster to an existing DC Cluster to ... Continued The post Group Replication Beyond a Single Cluster: DC-DR with Percona (PS MySQL) Operator appeared first on Percona. ## Too many GCache Page Files in MySQL Data Directory DevFeed: [Too many GCache Page Files in MySQL Data Directory]() Original publisher: [Read original article]() Author: Kedar Vaijanapurkar Published: 2026-09-17T05:29:14Z Content type: tutorial Language: en Sources: [Blog - Percona]() Topics: [XtraDB Cluster (PXC)](), [Replication](), [Transactions](), [MySQL]() Tags: [cluster](), [database-administration](), [disk-space](), [galera](), [galera-replication](), [gcache](), [gcache-freeze-purge-at-seqno](), [gcache-keep-pages-count](), [gcache-page](), [gcache-page-files](), [gcache-purge](), [gcache-troubleshooting](), [mysql](), [mysql-disk-space](), [mysql-troubleshooting](), [percona-xtradb-cluster](), [pxc](), [replication](), [xtradb-cluster-pxc]() ### AI overview An investigation into thousands of GCache page files accumulating in a Percona XtraDB Cluster data directory. The article explains how frozen GCache purging caused disk growth, links the behavior to a cluster partition, and describes reproducing it by setting gcache.freeze_purge_at_seqno and generating workload. ### Source excerpt Learn why PXC accumulates thousands of gcache.page.* files, how frozen GCache purging causes disk growth, and how to safely recover and rejoin using IST. The post Too many GCache Page Files in MySQL Data Directory appeared first on Percona. ## pgBackRest Compression: How Much CPU Is a Smaller Backup Worth? DevFeed: [pgBackRest Compression: How Much CPU Is a Smaller Backup Worth?]() Original publisher: [Read original article]() Author: Agustín Gallego Published: 2026-09-16T21:43:06Z Content type: comparison Language: en Sources: [Blog - Percona]() Topics: [Compression](), [Algorithms](), [PostgreSQL](), [postgresql 18](), [backups](), [Percona]() Tags: [algorithms](), [backup](), [compare](), [compression](), [cpu](), [percona](), [postgresql](), [postgresql-18](), [uncategorized]() ### AI overview This comparison measures pgBackRest compression algorithms and levels on Percona Distribution for PostgreSQL 18.4. It finds that low-level Zstandard offers a favorable balance between CPU use and backup size, with zst(3) near the efficiency curve's shoulder. ### Source excerpt In this blog post, we'll compare pgBackRest's compression algorithms and levels to find where spending more CPU stops buying a meaningfully smaller backup. The short version of the answer, which we'll build up to with real numbers, is that Zstandard at a low level is the sweet spot, and its default (zst(3)) already sits right ... Continued The post pgBackRest Compression: How Much CPU Is a Smaller Backup Worth? appeared first on Percona. ## Performance improvements in Percona Server 8.4.11-11 DevFeed: [Performance improvements in Percona Server 8.4.11-11]() Original publisher: [Read original article]() Author: Bogdan Degtyariov Published: 2026-09-15T11:52:54Z Content type: article Language: en Sources: [Blog - Percona]() Topics: [Percona Server for MySQL](), [Percona](), [MySQL](), [Cache](), [Scalability](), [Database]() Tags: [benchmark](), [benchmarks](), [cache](), [io](), [mysql](), [percona](), [percona-server-for-mysql](), [performance](), [scalability]() ### AI overview This article describes performance and scalability improvements in Percona Server for MySQL 8.4.11-11, focusing on changes to the InnoDB buffer pool and page flushing. It explains how narrowing mutex coverage and using finer-grained latching allows physical reads to proceed more in parallel, particularly for read-heavy, I/O-bound workloads. ### Source excerpt Focusing on Percona Server 8.4.11-11 My previous post (Performance Progression of Percona Server for MySQL 8.4) did a brief review of the performance changes in Percona Server for MySQL 8.4 released in 2026. I recommend reading it first to better understand the material in this post. Version 8.4.11-11 includes patches that deliver significant improvements in ... Continued The post Performance improvements in Percona Server 8.4.11-11 appeared first on Percona. ## Percona and HexaCluster: Faster, Safer Oracle Migration DevFeed: [Percona and HexaCluster: Faster, Safer Oracle Migration]() Original publisher: [Read original article]() Author: Percona Team Published: 2026-09-14T22:19:16Z Content type: article Language: en Sources: [Blog - Percona]() Topics: [Oracle Database](), [migration](), [Open Source](), [PostgreSQL](), [Database Migration](), [Replication](), [Tooling]() Tags: [database](), [database-migration](), [database-trends](), [engineering](), [insight-for-dbas](), [insight-for-developers](), [migration](), [open-source](), [oracle](), [partners](), [percona](), [postgresql](), [replication](), [schema](), [sql](), [tooling](), [validation]() ### AI overview Percona and HexaCluster describe a partnership for moving organizations from Oracle, SQL Server, DB2, and Sybase ASE to supported open source databases, primarily PostgreSQL. HexaCluster provides assessment and migration engineering through DMAT and HexaRocket, while Percona provides distributions, operators, and long-term support. HexaRocket combines schema migration, data migration, validation, change data capture, live replication, and reverse replication in one platform. ### Source excerpt Percona and HexaCluster have partnered to remove the hardest part of an open source database migration: getting off Oracle, SQL Server, DB2 or Sybase ASE with confidence, on a predictable timeline, without a multi-year consulting program. Percona brings open source expertise, its own distributions, operators and enterprise support. HexaCluster brings the assessment and migration engineering ... Continued The post Percona and HexaCluster: Faster, Safer Oracle Migration appeared first on Percona. ## Enabling TLS in PXC without Downtime DevFeed: [Enabling TLS in PXC without Downtime]() Original publisher: [Read original article]() Author: Juan Arruti Published: 2026-09-09T23:32:15Z Content type: tutorial Language: en Sources: [Blog - Percona]() Topics: [TLS (Transport Layer Security)](), [Replication](), [Security](), [Network](), [openssl]() Tags: [galera](), [high-availability](), [insight-for-dbas](), [mysql](), [open-source](), [percona](), [pxc](), [replication](), [security](), [ssl](), [tls](), [tls-handshake](), [uncategorized](), [xtradb-cluster-pxc]() ### AI overview This tutorial explains how to enable TLS for replication traffic in Percona XtraDB Cluster without a full cluster restart. Using Galera's socket.dynamic option, operators can perform two rolling restarts: first allowing encrypted and plaintext connections, then enforcing TLS-only communication. ### Source excerpt Starting with Percona XtraDB Cluster (PXC) 8.0, replication traffic encryption is enabled by default. That said, it's common to find clusters running without TLS that suddenly need it: a new compliance requirement, an audit finding, a network segment that is no longer considered trusted. PXC has a variable for exactly that case, pxc-encrypt-cluster-traffic, which handles ... Continued The post Enabling TLS in PXC without Downtime appeared first on Percona. ## Percona Operator for PostgreSQL 3.1.0: Transparent Data Encryption, Logical Replicas, and Persistent Logging DevFeed: [Percona Operator for PostgreSQL 3.1.0: Transparent Data Encryption, Logical Replicas, and Persistent Logging]() Original publisher: [Read original article]() Author: Slava Sarzhan Published: 2026-09-09T16:08:31Z Content type: release Language: en Sources: [Blog - Percona]() Topics: [PostgreSQL](), [Encryption](), [Logging](), [Kubernetes](), [Open Source]() Tags: [cloud](), [encryption](), [hashicorp-vault](), [kubernetes](), [logging](), [open-source](), [operator](), [percona](), [percona-operator-for-postgresql](), [postgresql](), [release](), [replication](), [security](), [slavasarzhan-pg]() ### AI overview Percona Operator for PostgreSQL 3.1.0 adds transparent data encryption with pg_tde, logical replicas for read-only workloads, and persistent logging across Pod restarts. The release also adds official RKE2 support and full ARM64 images. ### Source excerpt Percona Operator for PostgreSQL 3.1.0 takes on three things that decide whether a PostgreSQL platform passes review: is the data encrypted at rest, can it serve reads without straining the primary, and are the logs there when you need them. This release answers all three inside the custom resource, so none of them is a ... Continued The post Percona Operator for PostgreSQL 3.1.0: Transparent Data Encryption, Logical Replicas, and Persistent Logging appeared first on Percona. ## Stefan Fercot Joins Percona to Contribute to pgBackRest DevFeed: [Stefan Fercot Joins Percona to Contribute to pgBackRest]() Original publisher: [Read original article]() Author: Percona Team Published: 2026-09-09T15:55:38Z Content type: article Language: en Sources: [Blog - Percona]() Topics: [Percona](), [backups]() Tags: [backups](), [percona](), [percona-live](), [postgres](), [postgresql]() ### AI overview Stefan Fercot joined Percona's Postgres engineering team to increase its contributions to pgBackRest, a backup and restore tool. The article describes his prior advocacy for the project and Percona's sponsorship of its development. ### Source excerpt If you have spent any time in the Postgres community, you already know the name pgstef. Stefan Fercot has spent years as one of the most visible advocates for pgBackRest, a familiar face at European Postgres conferences, and countless hallway conversations about backups, high availability, and everything in between. Now he is doing that work ... Continued The post Meet pgstef: Why Stefan Fercot Joined Percona, and Why You Should Find Him at Percona Live Amsterdam appeared first on Percona. ## Mongorewind: Rewind Your MongoDB Test Data Without Restoring a Backup DevFeed: [Mongorewind: Rewind Your MongoDB Test Data Without Restoring a Backup]() Original publisher: [Read original article]() Author: Zelmar Michelini Published: 2026-09-02T11:38:40Z Content type: tutorial Language: en Sources: [Blog - Percona]() Topics: [MongoDB](), [Terminal](), [Command-line interface](), [ci](), [dashboards](), [Streams]() Tags: [ci](), [code](), [commands](), [database](), [mongodb](), [state](), [terminal](), [tests](), [ui]() ### AI overview This article introduces mongorewind, a terminal UI tool that records MongoDB data changes through a cluster-wide change stream and reverses them in reverse chronological order. It is designed to restore test data to its pre-test state without restoring a backup and supports interactive and CI use. ### Source excerpt Mongorewind: Rewind Your MongoDB Test Data Without Restoring a Backup One day, my friend Martín told me about a problem he and his team were dealing with. Every time they needed to run a pre-production test, they had to restore a copy of the production database into their test cluster. That process alone takes about ... Continued The post Mongorewind: Rewind Your MongoDB Test Data Without Restoring a Backup appeared first on Percona. ## OpenID Connect Authentication for MySQL, Now Fully Open Source DevFeed: [OpenID Connect Authentication for MySQL, Now Fully Open Source]() Original publisher: [Read original article]() Author: Michał Jankowski Published: 2026-09-02T08:56:26Z Content type: article Language: en Sources: [Blog - Percona]() Topics: [MySQL](), [OpenID connect (OIDC)](), [Authentication](), [JSON Web Tokens](), [OAuth](), [Open Source]() Tags: [authentication](), [jwks](), [jwt](), [mysql](), [oauth](), [oauth-2-0](), [oidc](), [open-source](), [openid-connect](), [percona](), [percona-server-for-mysql](), [percona-software](), [security]() ### AI overview Percona Server for MySQL includes an open-source OpenID Connect authentication plugin for specified 8.4 and 9.7 releases. The article explains how it authenticates users through standards-compliant identity providers and describes capabilities beyond the MySQL Enterprise plugin, including JWKS signing-key synchronization, group-to-role mapping, and proxy-user support. ### Source excerpt Percona Server for MySQL now ships with a fully open source OpenID Connect (OIDC) authentication plugin, available starting with Percona Server for MySQL 8.4.11-11 and 9.7.2-2 (not yet released as of this writing). It allows a MySQL account to authenticate against any standards-compliant Identity Provider (IdP) instead of relying on a locally stored password, closing ... Continued The post OpenID Connect Authentication for MySQL, Now Fully Open Source appeared first on Percona. ## Rotating Expiring X.509 Certificates in Percona Server for MongoDB with Minimal Service Interruption DevFeed: [Rotating Expiring X.509 Certificates in Percona Server for MongoDB with Minimal Service Interruption]() Original publisher: [Read original article]() Author: Ivan Groenewold Published: 2026-08-31T11:48:11Z Content type: tutorial Language: en Sources: [Blog - Percona]() Topics: [MongoDB](), [TLS (Transport Layer Security)](), [Authentication](), [configuration]() Tags: [authentication](), [certificates](), [insight-for-dbas](), [mongodb](), [private-key](), [rotation](), [security](), [tls](), [x509]() ### AI overview This tutorial explains how to renew same-CA X.509 certificates in Percona Server for MongoDB with minimal service interruption. It covers reloading TLS material with rotateCertificates, certificate and private-key configuration, limitations, validation, and cases where hot reload should not be used. ### Source excerpt Expired TLS certificates can prevent new client connections and, when X.509 is used for Percona Server for MongoDB internal authentication, also prevent members of a replica set or sharded cluster from authenticating to one another. In this post we will discuss performing a same-CA renewal: replacement certificates for server, member, and client leaf are issued ... Continued The post Rotating Expiring X.509 Certificates in Percona Server for MongoDB with Minimal Service Interruption appeared first on Percona. ## Benchmarking vector indexes DevFeed: [Benchmarking vector indexes]() Original publisher: [Read original article]() Author: Evgeniy Patlan Published: 2026-08-27T13:35:32Z Content type: article Language: en Sources: [Blog - Percona]() Topics: [benchmarking](), [Ground truth / benchmark quality](), [Databases](), [ann](), [datasets](), [Sorting]() Tags: [ai-vector](), [ann](), [benchmark](), [benchmarking](), [benchmarks](), [blog](), [blog-post](), [data](), [database-performance](), [database-trends](), [databases](), [datasets](), [embeddings](), [index](), [measurements](), [model](), [open-source](), [percona](), [points](), [report](), [run](), [search](), [sorting](), [vector-search](), [vectorsearch]() ### AI overview This article explains how Percona's vector-bench measures vector indexes by building database engines from pinned versions, running them in identical containers with the same data and hardware, and comparing consistent measurements. It describes embeddings, exact search, approximate nearest neighbour search, and ground truth as the brute-force reference needed to evaluate index accuracy. ### Source excerpt Nearly every database has vector search now, and every one of them has a blog post with a big number in it. Almost none of those numbers can be checked, because the thing that makes them meaningful is usually missing. We built a vector-bench to stop guessing. You name the engines you want, build them ... Continued The post Benchmarking vector indexes appeared first on Percona. ## Performance Progression of Percona Server for MySQL 8.4 DevFeed: [Performance Progression of Percona Server for MySQL 8.4]() Original publisher: [Read original article]() Author: Bogdan Degtyariov Published: 2026-08-27T13:07:20Z Content type: article Language: en Sources: [Blog - Percona]() Topics: [MySQL](), [benchmarking](), [Benchmark](), [Scalability](), [configuration](), [cpu](), [Hardware]() Tags: [2026](), [benchmark](), [benchmarking](), [benchmarks](), [concurrency](), [configuration](), [cpu](), [data](), [database](), [hardware](), [intel](), [latency](), [load](), [measurement](), [mysql](), [percona](), [percona-server-for-mysql](), [performance](), [processors](), [run]() ### AI overview This article investigates read/write performance changes across Percona Server for MySQL 8.4 versions released in 2026. It describes benchmark scope, database and buffer-size combinations, configuration, and CPU-frequency controls, while excluding features, security patches, latency percentiles, and resource-utilization measurements. ### Source excerpt 1. Purpose and scope This performance investigation aims to look into the read/write performance of Percona Server for MySQL 8.4 and how it changed between versions released in 2026: 8.4.8-8 released on 12 March 2026 8.4.10-10 released on 30 June 2026 8.4.11-11 released on 20 August 2026 We want to see if there are improvements ... Continued The post Performance Progression of Percona Server for MySQL 8.4 appeared first on Percona. ## Navigating the Walled Gardens of PostgreSQL: Hidden Risks of Postgres Vendor Lock-in DevFeed: [Navigating the Walled Gardens of PostgreSQL: Hidden Risks of Postgres Vendor Lock-in]() Original publisher: [Read original article]() Author: Robert Bernier Published: 2026-08-26T14:07:50Z Content type: opinion Language: en Sources: [Blog - Percona]() Topics: [PostgreSQL](), [vendor lock-in](), [Database Migration](), [Open Source]() Tags: [database-migration](), [database-trends](), [insight-for-dbas](), [insight-for-developers](), [migration](), [open-source](), [postgres](), [postgresql](), [vendor-lock-in]() ### AI overview The article examines how commercial ecosystems built around PostgreSQL can create walled-garden effects and constrain the portability of PostgreSQL-compatible systems. It highlights migration complexity, switching costs, and potential data-integrity risks when leaving such ecosystems. ### Source excerpt These days there's been a lot of talk about Postgres having an impact on "everything". Whether it's replacing legacy systems, creating a new greenfield project or even implementing it as a back-end to an agentic AI, Postgres is today's poster child for innovation. So performing something as dull and straightforward as a database migration should ... Continued The post Navigating the Walled Gardens of PostgreSQL: Hidden Risks of Postgres Vendor Lock-in appeared first on Percona. ## Replication Lag on AWS FSx: The Hidden EC2 Single-Flow Bandwidth Limit DevFeed: [Replication Lag on AWS FSx: The Hidden EC2 Single-Flow Bandwidth Limit]() Original publisher: [Read original article]() Author: Pablo Svampa Published: 2026-08-25T21:00:16Z Content type: article Language: en Sources: [Blog - Percona]() Topics: [Amazon Web Services](), [PostgreSQL](), [Amazon EC2](), [Replication](), [cloud-infrastructure](), [Network](), [Monitoring]() Tags: [aws](), [database](), [ec2](), [hardware-and-storage](), [insight-for-dbas](), [monitoring](), [network](), [postgresql](), [replication](), [storage]() ### AI overview This Percona case study examines PostgreSQL replication lag on an EC2 instance using Amazon FSx over NFS. Although AWS reported healthy storage with substantial provisioned capacity remaining, vmstat showed persistent I/O blocking and wait, indicating a bottleneck somewhere across the storage and network path, including an EC2 single-flow bandwidth limit. ### Source excerpt A recent case in our Percona Support team started with a familiar complaint. A PostgreSQL standby lagging behind its primary. Although the problem was simple, it brought a specific flavor that's worth sharing. The customer had already reached out to AWS Support about the storage layer behind the database, an Amazon FSx filesystem mounted over ... Continued The post Replication Lag on AWS FSx: The Hidden EC2 Single-Flow Bandwidth Limit appeared first on Percona.