Percona Server is a fork of MySQL Community Edition, focusing on performance improvements.

learn more… | top users | synonyms

15
votes
4answers
31k views

How do you identify InnoDB table corruption?

I have some tables that are partitioned and have several indexes on a replicated slave. After copying the snap shot (verified safe) to a new slave and upgrading mysqld from 5.1.42 to 5.5.15 and ...
12
votes
2answers
10k views

Percona vs MySQL

What is Percona? How does it differ from MySQL? When should we consider switching (or upgrading) from stock MySQL to Percona? To add some specifics in our situation we almost exclusively use ...
8
votes
1answer
5k views

Capabilities of InnoDB INSERT Performance

Hi I am running the most recent version of Percona Server. Server version: 5.5.24-55 Percona Server (GPL), Release 26.0 I have a 10 cpu box of these characteristics. processor : 0 vendor_id ...
6
votes
4answers
870 views

Mysql (percona-server 5.5) completely stalls during import (myloader)

While configuring our new servers (IBM X3650M4, 2x Intel Xeon E5-2620, 64G RAM, RAID 10 (4x 240G SSD)) we bumped into a strange problem. We're trying to import dumps (mydumper) from our (old) ...
6
votes
1answer
2k views

Tuning dedicated Percona Server with XtraDB for OLTP

Hardware specs for an OLTP DB dual quad core xeon with hyperthreading 24GB ram Hardware RAID10 BBU Software specs Standard install of Ubuntu 10.04LTS with default LVM partitioning Installed ...
5
votes
1answer
2k views

Percona mysqld got signal 11

I've googled and searched stackexchange, but can't find anything relevant to this particular issue (there are other error 11 issues, just not for this as far as I can tell). We have a server that is ...
4
votes
1answer
727 views

Online Schema migration in MySQL : When to start?

I'm the tech lead of a Social Media SAAS, where we're currently experiencing a big increase in data amount we're storing in our mySQL-database. We're having a single MySQL db, and besides many ...
4
votes
0answers
436 views

XtraDB Cluster Error : “IST first seqno 7 not found from cache, falling back to SST” in replication [closed]

I have a problem with MySQL clustering. My systems consist of: xtrabackup: version 2.0.2 MySQL: version 5.5.27 Distro: CentOS 5.7 64-bit my.cnf on the donor: [mysqld] binlog_format=ROW ...
3
votes
1answer
7k views

Very poor insert performance MySQL / Percona Server

I'm running a Percona-Server instance off an Ubuntu server install. I'm using an application that needs to access this database, and its having VERY poor performance. Once the database has been ...
3
votes
3answers
3k views

MySQL information_schema doesn't update

I have a database, say abc, in mysql server. It has only one table named test. test uses innodb engine and I've set innodb_file_per_table to true. After I run the query delete from abc.test, I want ...
3
votes
1answer
91 views

Super slow (day long) count(*) after upgrade to 5.6

After upgrading to Percona 5.6.20 from 5.5.34 I noticed counts on larger tables take a massively long time to execute. The table is about 27G and 300M rows. It is not compressed and was innodb ...
3
votes
1answer
306 views

Is the innodb_lazy_drop_table problem solved?

I'm researching database configuration for MySQL/MariaDB. I've been reading the configuration chapter in "High Performance MySQL". In there, it suggests that innodb_lazy_drop_table can be used to ...
3
votes
1answer
2k views

MySQL: mysqld_safe options

Is there a way to specify these options in configuration file? I've tried to add them into [mysqld_safe] section but it doesn't work: [mysqld_safe] numa-interleave = 1 flush-caches = 1 - # ps -ww ...
3
votes
1answer
184 views

MySQL Replication not proceeding

I have a weird replication problem I have not seen before. It's basic mysql replication with single master and two slaves. One of the slaves is not executing replication events and seems just stuck ...
3
votes
1answer
2k views

InnoDB temporary table location

I have a busy InnoDB table that expands and contracts regularly in size on a daily basis based on it's load. Typically, we'd see the table grow to 80GB in size (50/50 data and indexes) and then shrink ...
3
votes
1answer
1k views

Is it mandatory to enable --log_slave_updates with MySQL Replication using GTID? [duplicate]

I'm setting up 5.6 Percona Mysql, in order to enable GTID should I have to enable log_slave_update on both Master and Slave ? If I should enable log_slave_update, then I'm counting this to CONS for ...
3
votes
1answer
1k views

MySQL Handler_read_rnd_next == tablescans without indexes?

I am in the process of tuning our Percona 5.5 server, and have been using percona's tools to plot our database's performance. In the MySQL Handlers Plot, i have been noticing alot of "...
2
votes
2answers
345 views

Is there any reason not to use Percona 'innodb_fast_checksum'?

I recently came across a change that Percona Server implemented over normal MySQL InnoDB. The new feature is innodb_fast_checksum XtraDB can use a more CPU-efficient algorithm, based on 4-byte ...
2
votes
2answers
94 views

Percona 5.7 tokudb poor query performance - wrong (non-clustered) index chosen

I have a table with about 8.5m rows in it. The table is tokudb and it has the indexes described below. I'm experiencing dismal performance when trying to run update statements like the following: ...
2
votes
2answers
386 views

Is it necessary to run apply-log immediately after innobackupexec has run?

i have been trying to read other questions, but i did not find a answer to suit me. So excuse me if i ask something that has been already asked. I'm trying to organize my self and backup all my mysql ...
2
votes
2answers
1k views

any documentation on tpcc-mysql benchmark tool

Where can I find tpcc-mysql documentation? I google it but I can't find any documentation about it.
2
votes
1answer
572 views

Optimize Percona MySQL InnoDB 3.2TB database

(Before you will call me an idiot or start laughing, please remember it's a real deal on my side and I cannot cancel this assignment as it is a part of a bigger project) I have a database server that ...
2
votes
1answer
581 views

What is the Best way to set Disaster recovery setup for percona Xtra DB Cluster?

We do have a Percona XtraDB Cluster(Master-Master-Master) setup in one country. Now we want to setup a disaster recovery setup in some other country. Please provide us the best possible ways to do ...
2
votes
2answers
2k views

Slow INSERTs to MEMORY table

I've been trying to work this issue out, been really killing me! We've been experiencing some slow database queries for a Prestashop installation that we host, and a look into the query log revealed ...
2
votes
1answer
390 views

How big can innodb_doublewrite_file grow?

When I use the enable innodb_doublewrite_file ... How big can this file grow ? How can I calculate the optimal disk size, if it would be used only for this file?
2
votes
1answer
429 views

Assertion failure from InnoDB while restoring using Innobackupex

I thought I would give back to all those people who help me when I have a problem. This might be something old, but I did not find it anywhere so here goes: We recently upgraded our production DBs ...
1
vote
1answer
1k views

Unknown storage engine 'XtraDB'

I installed Percona Server 5.6.12-rc60.4, when I want create table such as : CREATE TABLE IF NOT EXISTS `mydb`.`table` ( `id` INT NOT NULL AUTO_INCREMENT , `title` VARCHAR( 64 ) NOT NULL , PRIMARY ...
1
vote
2answers
1k views

Baffled with MySQL LEFT JOIN query that I have to speed it up

I am kind of a puzzled with this query trying to optimize it but no way I am able to (due to my limited knowledge as a DBA). So, I asked the experts. In my setup I have three (primary) tables. ...
1
vote
2answers
237 views

Is there a way to get slow-query-log-like profiling information on a single query?

Specifically, I'm looking for this information: # Query_time: 0.011922 Lock_time: 0.000088 Rows_sent: 107 Rows_examined: 663 Rows_affected: 0 Rows_read: 107 # Bytes_sent: 4152 Tmp_tables: 3 ...
1
vote
1answer
466 views

MySQL InnoDB does not return the last row on select with DESC order

We have a table scheme like following: CREATE TABLE IF NOT EXISTS `offers` ( `id` int(11) NOT NULL AUTO_INCREMENT, `campaign_id` int(11) NOT NULL, `user_id` int(11) NOT NULL, `price` double ...
1
vote
2answers
1k views

Identifying cause of high I/O

I'm trying to diagnose the bottleneck for high-write I/O activity on a percona master (with replication to a slave). The pattern of behaviour is roughly cyclic and regular: 60 mins of 75-90% write-...
1
vote
1answer
2k views

slow writes on percona / mariadb server only when replication is running

Hi I am trying to migrate to percona server from mysql 5.6 on windows. In my development machine for percona is running of centos 6.5 which is installed on vmware 5.5 sphere. Our business ...
1
vote
1answer
604 views

Cannot execute statement: impossible to write to binary log?

When I try to create a user story/issue in my my percona xtradb cluster I am getting below error. How to fix it? Error creating issue: Could not create workflow instance: root cause: while inserting:...
1
vote
0answers
8 views

How to clear gcache pages in Percona PXC

I have a 4 node cluster(percona PXC) and one of the nodes have more than 150 gcache disk files each of size ~128 MB. I would like to purge or flush them so that the server user fresh gcache disk file. ...
1
vote
1answer
51 views

TokuDB table stats row count decreases to 1

I have a few Percona 5.6.30 servers with a TokuDB table that has ~120 million rows. On some of these servers, row count in SHOW TABLE STATUS mysteriously decreases until is hits 1. This is accompanied ...
1
vote
1answer
54 views

Replicating into a Percona XtraDB Cluster

We have a 2 node (plus an arbiter) Percona XtraDB cluster. It is used for data indexing/archiving. It has it's own database called archive but it is also the replication slave for a database called ...
1
vote
1answer
62 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, ...
1
vote
1answer
302 views

MySQL/Percona Server is taking long and I'd prefer to skip all this waiting even if it means data loss

Originally posted to https://www.facebook.com/groups/GNUAndLinux/permalink/10155020539805019/ but no replies received. I run Percona Server 5.6.21-70.0-688 x64 on Ubuntu Server 12.04 LTS x64, 64GB ...
1
vote
3answers
465 views

Integrity constraint violation in Percona XtraDB Cluster

We have a PHP application that uses AWS Load Balancer that connects to 3 Percona Servers. Before we used a single standard Percona Server and that never happened. The cluster starts throwing Primary ...
0
votes
2answers
123 views

Tokudb HotBackup

I was trying to evaluate the latest tokudb Hotbackup for percona's tokudb engine. This install is under debian (Ubuntu 14) I was able to get all the packages installed with out error and get all the ...
0
votes
2answers
189 views

troubleshoot high value for mysql innodb pages written per second

Our database is writting about 600 pages a second to its innodb buffer pools. Usually this value is about 10 pages/sec, so the server is experiencing a very high IO utilization, around 50%. Is there ...
0
votes
2answers
281 views

MySQL excessive tmp disk tables after Upgrade to 5.6

After upgrading two MySQL-Servers which run Master-Slave replication from Percona MySQL 5.5 to Percona MySQL 5.6 an excessive amount of temporary Tables gets created on the slave. The Master seems to ...
0
votes
1answer
568 views

trouble installing percona 5.6 on google compute engine debian

I've been trying to install percona server on a fresh google compute engine instance. I havent installed mysql server previously. i followed the instructions from here http://www.unixmen.com/install-...
0
votes
1answer
33 views

How can I disable xb_doublewrite?

Getting error while service restart. [ERROR] InnoDB: A parallel doublewrite file /test/mysql/xb_doublewrite found on startup.
0
votes
0answers
36 views

MySQL Upgrade query

I have 5.5.44-log MySQL Community Server (GPL) running in one of my RHEL 6.4 server. I need to upgrade the server to Percona Server-5.6.29-76.2. How to go about the upgrade? Should I completely remove ...
0
votes
0answers
59 views

How to start mysql without recovery rollback

I started a delete operation on table "A" in mysql which ran for 12 hours (lots of triggers and cascading deletes) already before I decided to kill this transaction. I waited then for another 12 hours ...
0
votes
1answer
143 views

MySQL percona 5.6 to MySQL 5.5 replication

Scenario 1 I am having a MySQL DB on 5.5 which is compliance, So need to upgrade it to MySQL 5.6. while doing this we see that 5.6 is running slow, were as it runs perfectly on 5.5 backup. Scenario ...
0
votes
0answers
37 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
0
votes
0answers
221 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 ...
0
votes
0answers
89 views

Temporary tables and Fetch times

We've noticed something curious in our office which no one seems to know the answer to. I'll explain: We have some mildly complex queries, one of which executes in under 3 seconds and then has a ...