Percona : MySQL open source fork with performance improvements

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Between optimizing a 1-billion rows table and dump-restoring it, which would be faster?

Have multiple tables which had more than 1 billion rows. Archived and deleted many of them, now want to recover the disk space. Have option to either optimize the table, or dump the table and restore ...
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3answers
146 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 ...
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2answers
357 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 ...
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0answers
34 views

InnoDB AUTO_INCREMENT resetting itself without MySQL restart

We've recently noticed the following scenario happening in many of our databases: A record is inserted, and receives an AUTO_INCREMENT primary key. The record is deleted. Another record is inserted, ...
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1answer
361 views

pt-table-checksum - Verify MySQL replication integrity

export/import: $ mysqldump -h6dhdbm01 -p clee2 users > 6dhdbm01-clee2.users.sql Enter password: $ echo $? 0 $ mysql clee2 < 6dhdbm01-clee2.users.sql $ echo $? 0 $ pt-table-checksum: $ ...
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3answers
39 views

MySQL Slave database size >> Master Database

I have a Percona MySQL Master-Master setup (5.6) with second master as passive master(read-only). Slave: mysql> SELECT table_schema AS "Database", ROUND(SUM(data_length + index_length) / 1024 / ...
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1answer
113 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 ...
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1answer
485 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 ...
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1answer
284 views

Innodb buffer pool indexes versus data usage

The server has 128GB of RAM. The innodb_buffer_pool_size is set to 106GB. mysql> show global variables like 'innodb_buffer_pool_size'; +-------------------------+--------------+ | Variable_name ...
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502 views

Strange Locking issues while playing back logs via percona playback

Problem while replaying logs I am in the process of benchmarking a new DB node (specs at the end) and have run across some strange behavior: As described here i: Created a dump (innobackupex ftw) ...
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1answer
117 views

Mysql Partitions with Partition limit

I have a partition table on basis of Primary key having 1.5 Billion rows in it. But when i check ibd files only 80 ibd show in GB's whereas 120ibd shows 1MB file. I would like to know how does the ...
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20 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 ...
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1answer
48 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 ...
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0answers
17 views

Master-master asyn replication between two PXC clusters and replicate-ignore-table

We have set up master-master async replication between two 3 node 5.5.41-37.0-55 PXC clusters. we need to exclude one table from the bi-directional replication. However, if we set ...
1
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1answer
26 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 ...
1
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2answers
46 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 ...
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2answers
38 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 ...
3
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1answer
253 views

innobackupex is failing while exporting backup

I am using perl script which is working fine in one of my other box which used to take individual schema backups & finally take all schema together using percona innobackupex. I have following ...
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2answers
46 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 ...
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1answer
71 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 ...
3
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1answer
99 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 ...
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1answer
58 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 ...
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1answer
32 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---- ...
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0answers
34 views

wrapping point in innodb log file

I ran optimizing tables on a server and at the same time percona xtrabackup script started running on the same server due to a cron job. After some time i got below xtrabackup error. xtrabackup: ...
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25 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 ...
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1answer
29 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 ...
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0answers
36 views

One node in Percona Cluster isn't coming up with following error

Whenever I try to start the services on this specific node it is failing with this error in log: [ERROR] WSREP: Node IP address not obtained from bind_address, trying alternate methods
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1answer
140 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 ...
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3answers
64 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
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1answer
36 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
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1answer
52 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 ...
6
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1answer
12k views

Should a MySQL replication slave be set to read only?

I've got replication running on Percona Server 5.5 by following this guide and wondered if I should add read-only=1 to my slave's my.cnf to make it read only? The guide sets up replication for the ...
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0answers
23 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
159 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
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1answer
87 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 ...
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0answers
28 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 ...
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0answers
66 views

MySQL drops every connection, even locally

Every time I run a MySQL query it has to reconnect mysql> show variables like '%timeout%'; ERROR 2006 (HY000): MySQL server has gone away No connection. Trying to reconnect... Connection id: 60 ...
4
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1answer
310 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 ...
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48 views

Percona: Innobackupex failing when taking incremental backup

I have been trying to take incremental backup as below and its getting error all the time. Innobackupex 2.1.8 Linux x86_64 Mysql 5.5.45 Step1: innobackupex -uxxx --stream=xbstream datadir > ...
4
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1answer
15k views

Why default character_set_server is latin1?

I am using MySQL 5.5 and when I show variables about charset, I have +--------------------------+----------------------------+ | Variable_name | Value | ...
2
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1answer
97 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 ...
4
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2answers
791 views

Percona Toolkit Installation Error

[root@localhost ~]# rpm -ivh percona-toolkit-2.2.7-1.noarch.rpm error: Failed dependencies: perl(DBD::mysql) >= 1.0 is needed by percona-toolkit-2.2.7-1.noarch perl(Time::HiRes) is needed ...
0
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2answers
54 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
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1answer
164 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 ...
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21 views

MySQL Cluster and Async replication

My requirement is to have percona cluster for high availability and have the MySQL's classical aysnc replication for disaster recovery purpose. Is this is feasible? What are the possible issues that I ...
3
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1answer
450 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 ...
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0answers
63 views

Galera Cluster backup and point in time recovery

Currently we have a 3 node Percona Galera Cluster, and all our writes go to node 1 and we run binary logs on this node also. We run xtrabackup backups on node1 every morning and move these off site ...
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0answers
24 views

HAProxy node sequencing

Is there a way to configure HAProxy to stop sending queries to one of the nodes in a percona xtradb cluster if that node is running a very slow query i.e, bypassing the node processing the extremely ...
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0answers
561 views

Low Query cache efficiency after mariadb 5.5 migration

We change from Percona MySQL server 5.5 to MariaDB but performance is not as good as we think. This graph is from a day in MariaDB. You can see the low performance in terms of cache_hits: We have ...
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0answers
61 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 ...