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Questions tagged [percona]

Percona : MySQL open source fork with performance improvements

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votes
1answer
150 views

pt-table-sync fails “Turning off AutoCommit”

While trying to use pt-table-sync with the following options for a list of slaves: pt-table-sync --print --replicate schema.checksum_table --sync-to-master slave-001 I receive the following error ...
1
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1answer
55 views

Why does Table Definitions Opened differ this much between cluster nodes?

I have a Percona/Galera cluster and see this when i monitor the different cluster nodes. What does this really mean? And is this something erroneous that needs to be taken care of? This is how one of ...
0
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1answer
33 views

MySQL: 3 servers on-site architecture

I have 3 servers with RHEL 6 OS and Percona server running in one of the servers in the same data centre, while the other 2 servers lie idle. Now I need to implement some kind of on-site redundancy (...
0
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2answers
683 views

Optimal database structure for fast inserts

I am using MySQL Percona server. This table needs to do fast bulk inserts using 'INSERT INTO ... VALUES' for smaller requests (about 100k records) and using 'LOAD DATA INFILE' for larger (up to 10kk ...
1
vote
3answers
1k views

Scaling for MariaDB / Percona / Galera Scaling

I ventured into the world of NoSQL database and as great as they are the lack of true ACID compliance has been a nightmare resulting in a lot of bad data so I am looking into relational databases. I ...
1
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2answers
368 views

What options in /etc/mysql/my.cnf are applicable to percona-server-client-5.6?

I installed percona-server-client-5.6 on Ubuntu; there is no mysql server installed on that same machine. In /etc/mysql/, the only file is my.cnf. That file contains many sections of options and I am ...
0
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1answer
594 views

MySQL how to find top consuming queries

I have the need to find top resource consuming queries in my Percona 5.6 server so that those queries can be fine tuned to improve the performance of the database. Also, is it possible to get the ...
1
vote
1answer
1k views

How to recover performance_schema after restoring from partial innobackupex backup?

I am taking a partial backup from a Master server, which needs to be restored on a to-be slave server. I only need one of the databases, and the mysql database. I am following instructions on https:/...
0
votes
1answer
274 views

Suddenly a massive amount of binlog files

I've seen a sudden increase of binlog files, very large in number and size, in all three nodes of a Percona XtraDB cluster: -rw-rw---- 1 mysql mysql 1,1G 19 oct. 16:11 binlog-32.000001 -rw-rw---- ...
7
votes
3answers
2k views

How to run OPTIMIZE TABLE on a 3-node cluster?

I've my hands on a 3-node Percona XtraDB Cluster where, according to mysqlcheck, some tables are corrupted (some indexes contain the wrong number of entries): mydb.mytable Warning : InnoDB: Index '...
0
votes
0answers
79 views

Replication of MySQL databases, but only some of the data

I need to set up a system to do basically a partial backup/replication of a couple of MySQL databases (actually Percona XtraDB 5.5, all tables are InnoDB). There are a few hundred tables in one of ...
1
vote
2answers
435 views

Securing MySQL backup process

I'm running my MySQL backups through cron scheduled every night, but the thing is in cron the username and password is given for it run, is there any other way I can securely run the backups? where I ...
1
vote
1answer
7k views

Of the multiple cnf files in /etc/mysql/conf.d/ dir, which would be the last one to be read (and will enventually take precedence)?

For some reasons (and only for some days to come) we are going to have 2 cnf files in /etc/mysql/conf.d directory, apart from the default one /etc/mysql/my.cnf. Now I know this can be disastrous, and ...
1
vote
3answers
365 views

Is it safe to run optimze on mutliple tables in parallel in mysql (percona)

I have a slave on which no query is coming. Lot of data has been archived and deleted from almost all tables. Size of tables vary from 80Gb to few Mbs. And there are around 130 such tables. Mysql (...
2
votes
1answer
91 views

MySQL users not visible after import

I have a Percona MySQL database 5.6 running in a linux machine. I have created new users called test1 and test2. What I did was I imported mysql database from my test setup to this new setup. After ...
2
votes
1answer
117 views

MySQL connection process slow for non-root user

I'm using Percona server 5.6 on Linux. When I connect to MySQL from the command line as the root user, it connects immediately. I have also created a new user in the database, but when I try to ...
2
votes
3answers
2k views

Percona XtraDB - Random deadlock

Randomly my database gets locked completely and queries hang and they pile up until it gets "Too many connections". Below is my mysql log file, I couldn't find anything related to the error system ...
1
vote
0answers
85 views

MySQL/Percona Audit Log Plugin Not Working

I've been looking to implemement the Percona Audit Log plugin. So far I have installed it and configured it, and it seems to be working ok. Except, I have installed it on a slave Database as I don't ...
1
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2answers
1k views

Disaster recovery solution for MySQL

I have set a Master-master replication with the second Master running as read-only. This master-master setup is on the same location. Now I will have to setup an DR for this production at a different ...
2
votes
1answer
956 views

How to:: Master-Master replication

I have setup Master-Master replication on two servers. Now, my question is that if I need to have the second master as only read-only, what should I do? I tried doing mysql> flush tables with ...
0
votes
0answers
44 views

Doubt on Master-Master replication

I'm setting up a master-master replication where in the second master is only read only there by reducing the issues of conflicts. My doubt is that to reduce the downtime when my master goes down I ...
2
votes
1answer
359 views

Split brain scenario - RAC and PXC

Even though split brain scenario occurs in both Oracle RAC and Percona's XtraDB Cluster, a two node cluster is allowed and split brain scenario is resolved in RAC but a two node is not recommended in ...
0
votes
3answers
336 views

What is happening when Seconds_Behind_Master oscillates between two very different sets ov values?

I have a Percona 5.6 slave, newly set up, that is replicating from a server that is itself a slave to a third. The middle server (dbS2, the master for dbS3) is currently ~260000 seconds behind the ...
1
vote
1answer
1k views

Innobackupex: How to extract individual files from xbstream compressed backups

We are scripting a mix of full and incremental backup setup for our prodcut backend with sunday triggering full backup and incremental backup on all the remaining days. In this process, we should be ...
4
votes
1answer
2k views

Active-active Cluster In MySQL

I'm planning to go for a 3-node active-active MySQL cluster which will not have more 100 databases. Many experts here have already told there are issues with MySQL 5.6 and 5.7 where circular ...
4
votes
2answers
3k views

Column cannot be converted from type 'int' to type 'bigint(20) unsigned'?

I have a Percona MySQL cluster, with a master and a few slaves. Each of them is running "Ver 14.14 Distrib 5.5.40-36.1" of MySQL. Replication is row based. I ran an alter query on one of the tables ...
2
votes
3answers
788 views

9 node percona xtradb cluster

We are looking to launch a 9 node percona xtradb cluster on Amazon where each ec2 node uses 20k iops disks. I was afraid if a 9 node cluster will work and mostly what I see is 3 node clusters. We ...
1
vote
0answers
308 views

Innobackupex restore steps from 1 incremental and multiple incremental steps

My current backup plan is: Full -> Incremental1 based on full -> incremental2 based on incremental1 -> incremental3 based on incremental2... Please validate if this steps is correct during emergency ...
1
vote
1answer
98 views

MySQL: Incorrect binary log format - OFF.000

I have a Percona MySQL 5.5.30 as a master(Debian 6.0.7). I got a weird issue that all my binary logs started saving in format OFF.00* instead of the specified format in .cnf file. mysql> show ...
2
votes
1answer
363 views

Innobackupex apply-log should be done before emergency restore or after each backup?

Basically Percona Innobackupex consist with three steps: 1. Backup 2. Apply log 3. Copy back restore during emergency My question: When should I do apply log? Is it after each backup or before ...
0
votes
1answer
47 views

pt-table-checksum toolkit for few databases from file

I've got a question. I'm doing a simple script right now and it isn't working like I want. #!/bin/bash cat /etc/backup.conf | egrep -v "(^#.*|^$|^--.*)" > /tmp/databases while read ...
0
votes
1answer
1k views

Cannot overwrite file: /var/lib/mysql/ibdata1 when using Percona xtrabackup

I am receiving an error when I am trying to restore from a percona backup to my local mysql server. Cannot overwrite file: /var/lib/mysql/ibdata1 at /usr/bin/innobackupex line 2128. sudo ...
0
votes
0answers
737 views

How to troubleshoot, find and fix query Percona 5.6 with error “SQLSTATE[HY000]: General error: 1785 When @@GLOBAL.ENFORCE_GTID_CONSISTENCY = 1”

i'm running Magento CMS, and underneath there are 2 physical servers both with Percona Server version: 5.6.23-72.1-log Percona Server (GPL), Release 72.1, Revision 0503478 in Master/Slave with ...
0
votes
1answer
64 views

How to determine if an Index is uselss in Percona MySQL?

Using Percona Server 5.5 I've a table which stores user activty (lets call it user_activity). It was created quite a few years ago when I had only a little bit of knowledge about database ...
0
votes
1answer
2k views

set session wait_timeout inside of phpmyadmin for export/import

I need to increase wait_timeout variable in mysql only when access mysql from phpmyadmin. I don't want to edit my.cnf file or set it globaly in mysql server. I've read documentation, but haven't ...
1
vote
1answer
915 views

percona cluster 5.6 - handshake with remote endpoint failed, but endpoint is not part of config

I set up a cluster of 3 database nodes using a percona 5.6 cluster. Everything works, all nodes are replicated. I configured SSL for state transfer. The cluster recently changed its topography, ...
1
vote
1answer
531 views

Percona MySQL 5.6 databases ignoring key length at constrait creation

We have a 3 servers running Percona MySQL 5.6 in a Master/Master configuration that are all reporting errors on key length, either too long or not specified. The structure of the databases is all ...
0
votes
1answer
174 views

Mysql Multiple data files rollover size

we want to setup the mysql ibdata files in such a way that after every 100M , new data is added to another file specified in innodb_data_file_path i.e. innodb_data_file_path=ibdata1:100M;ibdata2:100M:...
2
votes
1answer
1k views

Will large inserts crash a 3-node MySQL database cluster?

We have a 3 node MySQL database cluster than runs on Percona. I have a stored procedure that inserts a lot of rows in one hit, potentially over a million rows. I've been warned (by our DBA) this ...
5
votes
1answer
4k views

Mysql Cluster vs Percona/Maridb Cluster [closed]

We want to setup a mysql cluster with master-master sync replication, to provide HA so that one db for write from one app, other for write from other app. It is a webapp with high write and medium ...
0
votes
1answer
253 views

Does Percona Xtrabackup support RedHat release 4

I downloaded Percona's Xtrabackup rpm file for RedHAT. I attempted to install but hit into an error. The error seems to point to missing dependencies and libraries. I have no issue with RedHat 6 OS. I ...
0
votes
1answer
1k views

Mariadb Galera Cluster using Xtradb backup is not working

I am trying out the first test of MariaDB Galera cluster setup without success. This is the error in the log innobackupex: Created backup directory /tmp tar: -: Cannot write: Broken pipe tar: Error ...
1
vote
1answer
2k views

MySQL 5.5 Replication to Galera/Percona XtraDB Cluster

We are currently investigating moving our current MySQL 5.5 Master > 5 x Slaves (with Statement Based Replication, apx 250GB data and growing) to a HA clustering option. Mainly to provide greater ...
0
votes
1answer
627 views

Mysql master master with high latency

We have a single master setup with many slaves in germany and some slaves in australia. To have faster writes in australia we want a master-master setup between germany and australia. Read slaves ...
2
votes
2answers
1k views

How pt-online-schema-change ensures consistency during data copy

I have read pt-online-schema-change documentation and understood that it works by creating triggers and copying data in chunks with in chunk-time seconds(0.5 seconds in default) Let us consider this ...
0
votes
1answer
59 views

Mysql JOIN with 25million rows

Recently I got stucked with a table where its grown to +25million and I have got a query that's doing a JOIN on it. The query take 2.5hours to execute even though I got Good 96GB RAM and RAID10 with ...
5
votes
1answer
475 views

MySQL Partitions with Partition limit

I have a partitioned table on the basis of the Primary key having 1.5 Billion rows in it. But when I check the .ibd files only 80 ibd show in GB's whereas 120ibd shows 1MB file. I would like to know ...
2
votes
1answer
339 views

Slow ranking values in MySQL

I have a table of around 30 million retail products, with various INT columns that describe sales counters and pricing at different retailers. I'm supposed to display well over 70 different rankings ...
0
votes
0answers
34 views

Does pt-table-checksum work in circular replication environments?

I have 3 masters in circular replication. I run pt-table-checksum in one of the masters only. A->B->C->A The queries do get replicated the "next" server B but I don't think they are being replicated "...
0
votes
0answers
307 views

Very slow IO on mysql percona server

Our site goes down because the IO on our database servers is too slow. Troubleshooting this we found that mysql is really really slow. It's constantly reading from disk and I think not using enough ...