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Questions tagged [percona]

Percona : MySQL open source fork with performance improvements

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16 views

Where and how to set the variables for Percona MySQL Audit Variables

I am trying to set the variable values for Percona MySQL Audit Plugin in my.cnf file before installing the audit plugin on MySQL Server like 'audit_log_rotate_on_size','audit_log_rotations' and '...
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1answer
31 views

Percona Xtradb cluster 56 node 2 rejoin cluster failed

I have following DB cluster: Node 1: Percona-XtraDB-Cluster-56-5.6.39-26.25.1 Node 2: Percona-XtraDB-Cluster-56-5.6.39-26.25.1 Node 3: Percona-XtraDB-Cluster-56-5.6.41-28.28.1 I start in order ...
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30 views

MySQL InnoDb crash when importing tablespace from remote machine

InnoDB crashes when importing ibd file from remote machine. Source version is MySQL-5.6.40, Destination version is MySQL-5.6.40. Database was backed up was backed Percona Xtrabackup with xbstream ...
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2answers
26 views

Using CONVERT TO CHARACTER SET for changing only collation?

I think the answer to this is an obvious yes, but I'm having trouble finding confirmation on it. All the questions related to charsets seems to be about changing the charset and not only collations. ...
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19 views

Percona Audit plugin making the MySQL Server not to start

First I Installed the Percona audit plug-in on our MySQL Server (my MySQL Server version is 5.5.38) and then I stopped the mysql server and then in the my.cnf file added the variables like: ...
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16 views

Learning Percona Monitoring - CPU Usage

I've just started using the Percona Monitoring. I am not necessarily a db admin but I ended up with the task. I am enjoying it but truth be told I am not sure what I am looking at. There is an ...
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10 views

do tmpdir is cleaned up automatically

While testing a 3 node percona cluster we often get: Errcode: 28 - No space left on device After login to the servers and checking the defined tmpdir I notice that is empty and clients can connect ...
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45 views

XtraDB Cluster 5.7 - IST failes

Long story short: IST of a 5.7 node works against 5.6, but not against another 5.7 node. Since several days, I try to upgrade our three node Percona 5.6 cluster by adding two 5.7 nodes and then ...
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22 views

Proper way to fully backup and restore a database including indexes in a low-resource shared web host with ssh access?

I'm rather new to database management and I would like some advice on better practices by using the following experience as an example. Every time I update php software I do a quick export from ...
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1answer
37 views

Is it safe to use pt-online-schema-change in a multimaster environment?

I have 2 MySQL servers with row-based replication between them. Both of them are masters and slaves for each other (active-active master-master setup). If I understand it correctly pt-osc creates ...
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57 views

Is ProxySQL Suitable for Connection Pooling Apps?

I'm looking for some guidance on whether ProxySQL is suitable as a method of failing over Java connection pool based apps in a multi-master replication (with read/write split) set up? I've found ...
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1answer
18 views

Xtrabackup corrupt incremental backup

I have 3 nodes PXC 5.6 cluster. Xtrabackup 2.3.10. Centos 7.6 Percona-XtraDB-Cluster-56-5.6.41-28.28.1.el7.x86_64 I am using only single Node-1 for both read and write. And I use to take backup ...
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1answer
53 views

Percona PAM with AD authentication using SSSD

I have installed percona PAm plugin on my Percona server as shown below: mysql> show plugins; ... | auth_pam | ACTIVE | AUTHENTICATION | auth_pam.so | GPL | | ...
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2answers
48 views

Safe backup of PXC / Galera cluster

I have 3 nodes 'master master' cluster and using PXC 5.6 But I am only using a single node for both read and write. Before using pxc, i was using standalone Mariadb 5.5 and I was taking backup using ...
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1answer
23 views

Convert MyISAM to InnoDB in PXC master master

I have 3 nodes PXC 5.6 master master cluster. I have few tables that are using MyISAM. Total MyISAM table = 120 Total MyISAM table size = 80MB I have also read few recommendations where it suggests ...
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1answer
15 views

Character set warning in PXC logs

I am using PXC 5.6 (Percona-XtraDB-Cluster-56-5.6.41-28.28.1.el7.x86_64) and my log file is flooded with this warning: [Warning] Client failed to provide its character set. 'latin1' will be used ...
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1answer
33 views

Auto increment gap in percona xtradb cluster master master setup

I was using mariadb 5.5 before but now I have upgraded it and using percona xtradb cluster 5.6 I have 3 nodes cluster. I am only using single node for read and write. I saw some increment gaps in ...
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0answers
46 views

Percona Xtradb Cluster not accepting options on command line

I am using Percona Xtradb Cluster 5.6 and trying to start my cluster through a donor node via command line and I am getting this error: CentOS 7: systemctl start mysql --wsrep-sst-donor=srv1 ...
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1answer
27 views

Missing wsrep variables in mysql / percona / galera cluster

I set up a small mysql/percona/galera cluster using the percona cluster docker image, with 3 nodes. I followed the documentation written here After starting up the whole cluster, I'm missing some of ...
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1answer
107 views

InnoDB Buffer causing a lot of deadlocks and connection/client timeouts

I have a PXC cluster (5.7) with three nodes running on CentOS 7 VMs, each with the following system info: mysql_db# free total used free shared buff/cache ...
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1answer
146 views

MongoDB Migrating away from RocksDB to WiredTiger

We have been working for some time with RocksDB as our engine and we are now trying to migrate to WiredTiger. We have some pretty big databases around 4~12 TB of data and according to the process ...
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20 views

mysql got connection timeout vs error tineout

I have Percona XtraDB Cluster with 3 nodes, and noticed a lot of the following timeout messages in my MySQL error log: 2018-11-13T08:34:13.724411-00:00 411826 [Note] Aborted connection 411826 to db: '...
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99 views

Percona 5.6.28-76.1: optimize config for database (Invision Power Board)

At the beginning I would like to explain that I'm not a DB expert. My hosting provider is struggling with DB optimization for my website. Unfortunately seems that they are out of ideas. I would like ...
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1answer
84 views

MySQL PXC node failing to receive state

I have three nodes that I want to setup into a Percona XtraDB Cluster (PXC). I have bootstrapped the first node and joined the second node, but cannot somehow join the third node. All configuration is ...
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0answers
25 views

Database with lots of writes to a big table uses less CPU than the same database with less writes?

I'm trying to understand why InnoDB/MySQL behaves the way it does and if there's anything I can change in the configuration to fix it. I have a table with nearly 5M rows, about 9GB in size. I also ...
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1answer
48 views

ProxySQL in PXC and failing all nodes

I'm going to install Percona XtraDB Cluster, and I have two questions about it: 1- Is it the last step? https://www.percona.com/doc/percona-xtradb-cluster/LATEST/verify.html Or installing ProxySQL ...
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2answers
63 views

MySQL Solution to Sync 3 servers data

I have 3 servers which there is a load-balancer in front of them and sends the requests to these servers randomly. The script is the same in all of these 3servers, but I need to sync the DB in all of ...
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1answer
67 views

Percona pt-table-sync Can't determine Master

We have following Multi master replication scenario. We are using MariaDB 10.1.34 and Percona 3.0.11 Master: Name: db-master1 (192.168.14.5) Slave: Name: db-slave2 (192.168.15.5) Replica Connection ...
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1answer
84 views

Percona pt-table-checksum output is in infinite loop “Waiting for the --replicate table to replicate”

We have following Multi master replication scenario. We are using Mariadb 10.1.34 and percona 3.0.11 Master: Name: db-master1 (192.168.14.5) Slave: Name: db-slave2 (192.168.15.5) Replica ...
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1answer
89 views

Enable GTID on one node in Percona/Galera

Im having 3 node percona cluster. (5.6) Server ID is enabled on each node but all are different IDs. Binlog and log slave updates are enabled. Now I want to enable GTID on the third node alone. I ...
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1answer
23 views

Does wsrep_cluster_address only accept the intranet IPs?

I was installing Percona XtraDB Cluster with 3 nodes. Each node has a unique Internet IP address. Following the docs Quick Start Guide for Percona XtraDB Cluster, I got the first node running but ...
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1answer
41 views

Point In Time recovery on Mysql

Can someone please advise best methods to do a mysql PITR from binary logs that are saved in MIXED format. I am finding it difficult to identify the wrong queries that executed to avoid from restore ...
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1answer
54 views

Percona xtradb Backup for OLTP

I have installed MySQL 5.7 community edition installed. Can we use Percona xtradb backup tool for backup DB for banking site databases for OLTP?
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1answer
185 views

what is MDL? (e.g. 'MDL semantics' or 'MDL locks') Probably Galera related

I found a guy talking about MDL semantics in a Galera/XtraDB bug report. What is MDL? The term MDL also in Galera logs MDL conflict. Please explain in detail. 2018-06-14 17:07:10 140112699321088 [...
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32 views

percona mysql key_buffer_size value on replication slave

I noticed way odd behavior of replication slave due to altering key_buffer_size parameter. I have 5.6.39 version of percona mysql and RAM 257671MB, according to the articles in the Internet i ...
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0answers
202 views

DPKG error: uninstall percona xtradb server 5.7

Trying to uninstall percona, as I broke installation. No luck: >$ sudo apt remove percona-xtradb-cluster-server-5.7 Reading package lists... Done Building dependency tree Reading state ...
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2answers
322 views

Mysql backup of remote server in local machine using percona xtrabackup

I had asked this question in serverfault.Later, i came to know about this site. I have percona xtrabackup installed in my ubuntu client machine. My local machine IP address is 192.168.0.100. The ...
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0answers
84 views

TokuDB/Percona - Insert Performance worse as table grows

We have a bunch of existing servers which run just fine, inserting our thousand rows/second, but the new batch just will not do it. As the day goes on and the table grows, it gets slower and slower, ...
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2answers
2k views

How to set MySQL binlog retention in hours?

I'm in a situation where the MySQL log partition is being filled in less than a day. I can't disable binlogs, since I need them for replication. I know I can set log retention but that accepts days, ...
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2answers
494 views

ProxySQL user not connecting - XtraDB

I'm trying to set up a xtraDB Cluster consisting of 3 nodes. Now i've got the cluster up and running and per the instructions i'm trying to set up ProxySQL for load balancing. So i've installed ...
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2answers
233 views

MySQL XtraDB/Galera Cluster High Availability RamDisk *SuperFast*

Ok, So this is going to be a speculative question, mostly design oriented and a rather long one. I'd grab a cuppa' covfefe, if I were you. Preface: So I have been researching into databases and ...
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2answers
200 views

Percona XtraDb cluster auto increment

Help me please clarify a very important question on which I can't find the answer. It only can be proven with tests. Let's say we have XtraDB Cluster (or Galera Cluster) with three nodes. We have ...
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91 views

Xtrabackup fails for full backup after a restore

After a restore in Percona 5.7 from another Percona 5.7 server full backups are failling with the following error: xtrabackup: cd to /data/mysql xtrabackup: open files limit requested 0, set to ...
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256 views

Full database backup using xtrabackup stream

I'm new to Percona XtraBackup. I've been trying to perform a full backup stream from my local ( test server around 600GB ) to remote server. I just have some questions and I need guides, and I think ...
2
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1answer
322 views

Using Pt-online schema change on multi master MYSQL

We are using two MYSQL servers in ring replication where master is also a slave of the other master. Both have slaves connected to each other. We want to run pt-online-schema-change to add couple of ...
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1answer
143 views

How can I make an Async Slave track all of the nodes in a Percona XtraDB Cluster?

I'm seeing a lot of tutorials that claim I have to pick just one of the nodes in my master-master replicated PXC to act as master for an async slave using vanilla mysql replication, and if something ...
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2answers
339 views

High “Pending normal aio writes”

During daily batch operations (mass delete/upsert operations), regular throughput is sometimes affected, e.g. operations such as a single lookup on a PK or a small range (7 rows examined, 1 row ...
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2answers
398 views

MySQL InnoDB .ibd file growing extreme

We have a database with a few larger tables were one (yes only one) table grows extremely. It contains only 50 gigabytes of data while the .ibd file (we use innodb_file_per_table) takes up about 1.2 ...
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2answers
1k views

MySQL memory usage keeps growing. 30GB growth in 3 weeks

We have a server with 64GB memory. After restarting MySQL, in 3 weeks memory is almost full. MySQL was installed using Debian Percona packages. Version: Percona Server Release 17 5.7.19-17-log In ...
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1answer
86 views

(re)creating empty tables in partially restored mysql database fails with “table exists”

Following situation: I have a MySQL Server (running Percona Server 5.7) set up as a replication slave. This server should hold only a partial replication. To get to this I made a partial backup of ...