# galera

Published articles for galera.

This is one page of public article previews, not the complete archive. Follow Next page to continue. Summaries are not the original full articles.

## Too many GCache Page Files in MySQL Data Directory

DevFeed: [Too many GCache Page Files in MySQL Data Directory](<https://devfeed.tech/articles/too-many-gcache-page-files-in-mysql-data-directory-35043.md>)

Original publisher: [Read original article](<https://www.percona.com/blog/too-many-gcache-page-files-in-mysql-data-directory/>)

Author: Kedar Vaijanapurkar

Published: 2026-09-17T05:29:14Z

Content type: tutorial

Language: en

Sources: [Blog - Percona](<https://devfeed.tech/sources/blog-percona.md>)

Topics: [XtraDB Cluster (PXC)](<https://devfeed.tech/topics/xtradb-cluster-pxc.md>), [Replication](<https://devfeed.tech/topics/replication.md>), [Transactions](<https://devfeed.tech/topics/transactions.md>), [MySQL](<https://devfeed.tech/topics/mysql.md>)

Tags: [cluster](<https://devfeed.tech/tags/cluster.md>), [database-administration](<https://devfeed.tech/tags/database-administration.md>), [disk-space](<https://devfeed.tech/tags/disk-space.md>), [galera](<https://devfeed.tech/tags/galera.md>), [galera-replication](<https://devfeed.tech/tags/galera-replication.md>), [gcache](<https://devfeed.tech/tags/gcache.md>), [gcache-freeze-purge-at-seqno](<https://devfeed.tech/tags/gcache-freeze-purge-at-seqno.md>), [gcache-keep-pages-count](<https://devfeed.tech/tags/gcache-keep-pages-count.md>), [gcache-page](<https://devfeed.tech/tags/gcache-page.md>), [gcache-page-files](<https://devfeed.tech/tags/gcache-page-files.md>), [gcache-purge](<https://devfeed.tech/tags/gcache-purge.md>), [gcache-troubleshooting](<https://devfeed.tech/tags/gcache-troubleshooting.md>), [mysql](<https://devfeed.tech/tags/mysql.md>), [mysql-disk-space](<https://devfeed.tech/tags/mysql-disk-space.md>), [mysql-troubleshooting](<https://devfeed.tech/tags/mysql-troubleshooting.md>), [percona-xtradb-cluster](<https://devfeed.tech/tags/percona-xtradb-cluster.md>), [pxc](<https://devfeed.tech/tags/pxc.md>), [replication](<https://devfeed.tech/tags/replication.md>), [xtradb-cluster-pxc](<https://devfeed.tech/tags/xtradb-cluster-pxc.md>)

### 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.

## Enabling TLS in PXC without Downtime

DevFeed: [Enabling TLS in PXC without Downtime](<https://devfeed.tech/articles/enabling-tls-in-pxc-without-downtime-14095.md>)

Original publisher: [Read original article](<https://www.percona.com/blog/enabling-tls-in-pxc-without-downtime/>)

Author: Juan Arruti

Published: 2026-09-09T23:32:15Z

Content type: tutorial

Language: en

Sources: [Blog - Percona](<https://devfeed.tech/sources/blog-percona.md>)

Topics: [TLS (Transport Layer Security)](<https://devfeed.tech/topics/tls.md>), [Replication](<https://devfeed.tech/topics/replication.md>), [Security](<https://devfeed.tech/topics/security.md>), [Network](<https://devfeed.tech/topics/network.md>), [openssl](<https://devfeed.tech/topics/openssl.md>)

Tags: [galera](<https://devfeed.tech/tags/galera.md>), [high-availability](<https://devfeed.tech/tags/high-availability.md>), [insight-for-dbas](<https://devfeed.tech/tags/insight-for-dbas.md>), [mysql](<https://devfeed.tech/tags/mysql.md>), [open-source](<https://devfeed.tech/tags/open-source.md>), [percona](<https://devfeed.tech/tags/percona.md>), [pxc](<https://devfeed.tech/tags/pxc.md>), [replication](<https://devfeed.tech/tags/replication.md>), [security](<https://devfeed.tech/tags/security.md>), [ssl](<https://devfeed.tech/tags/ssl.md>), [tls](<https://devfeed.tech/tags/tls.md>), [tls-handshake](<https://devfeed.tech/tags/tls-handshake.md>), [uncategorized](<https://devfeed.tech/tags/uncategorized.md>), [xtradb-cluster-pxc](<https://devfeed.tech/tags/xtradb-cluster-pxc.md>)

### 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.