Re: Steps of setting up shared database server on FromDual GmbH

Verification of the formula

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 06 Apr 2016 08:04:06 +0200

Yesterday we did a first real life test of the formulas and the predictions of all 3 methods where quite congruent… So I personally trust them!

FPMMM Agent: got TERM signal

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sun, 06 Mar 2016 09:39:36 +0000

MySQL Performance Monitor agent gets a TERM signal from time to time:

39004:2015-02-23 09:59:36.365 - INFO: FromDual Performance Monitor for MySQL (0.9.3) run started.
39004:2015-02-23 09:59:37.770 - INFO: FromDual Performance Monitor for MySQL run finshed (rc=0).
39089:2015-02-23 09:59:46.458 - INFO: FromDual Performance Monitor for MySQL (0.9.3) run started.
39089:2015-02-23 09:59:47.865 - INFO: FromDual Performance Monitor for MySQL run finshed (rc=0).
39181:2015-02-23 09:59:56.510 - INFO: FromDual Performance Monitor for MySQL (0.9.3) run started.
39181:2015-02-23 09:59:57.855 - INFO: FromDual Performance Monitor for MySQL run finshed (rc=0).
39290:2015-02-23 10:00:06.311 - INFO: FromDual Performance Monitor for MySQL (0.9.3) run started.
39290:2015-02-23 10:00:09.094 - ERR : got TERM signal. Cleaning up stuff an exit (rc=1).
39290:2015-02-23 10:00:09.094 - INFO: FromDualMySQLagent::removeAgentLock
39290:2015-02-23 10:00:09.095 - INFO: FromDual Performance Monitor for MySQL run finshed (rc=1).

Can you advise why it might be getting a TERM signal?

Hello DBStarter

oli.sennhauser@fromdual.com (Oli Sennhauser) — Mon, 08 Feb 2016 08:50:00 +0200

Hello DBStarter

First of all a few things:

About MariaDB documentation: I would say the MariaDB documentation is not too bad compared to other open source project documentation or even enterprise software documentation. But its far from being brilliant.
Then: How much did you or your company pay for MariaDB subscription? A part of the subscription fee flows into documentation to make it better. If you have a subscription with a support provider you also can ask such questions there.
MariaDB claims to be an open source project. How much did you or your company contribute back to the project documentation (or event the server)?

To your question:

The most important maintenance and operations task for MySQL/MariaDB are:

Proper Backup and Restore testing
Monitoring
Clean-out old data

MariaDB does otherwise not need much maintenance work.

If you have tables with may UPDATE/DELETE statements sometimes an OPTIMIZE TABLE can help. And if you experience flipping query execution plans an ANALYZE TABLE can help.

Regards, Oli

MariaDB and MySQL developer training

oli.sennhauser@fromdual.com (Oli Sennhauser) — Tue, 29 Dec 2015 16:48:44 +0000

You are already a database application developer or on the way there. Now you would like to learn more about, what MySQL and MariaDB features are available which you can use later to build even better applications, to develop more efficiently applications and shorten your time to market.

Requirements

You are already familiar with the SQL language and have already some experience with MySQL or any other relational SQL database system.

Audience

Future MySQL application developer
MySQL and MariaDB database administrators

Connecting and MySQL-Tools
JOIN, UNION, SUBQUERY
Transactions
Locking
Deadlocks
Import and export of data
Views, Materialized Views, Virtual Columns
MySQL Functions
Spatial Functions
Fulltext search
Prepared Statements
Variables
Stored Routines
Stored Functions
Triggers
Events
Compound Statements and Cursor
Dynamic SQL
Exceptions and error handling
Debugging and Logging
Profiling
User Defined Functions
Schema Tuning
Query Tuning
Software Profiling

Duration

3 days

Booking trainings

Trainings for Germany can be booked on-line here and trainings in Switzerland here.

Advanced trainings

MySQL and MariaDB beginner training

oli.sennhauser@fromdual.com (Oli Sennhauser) — Tue, 29 Dec 2015 16:47:08 +0000

You are new in the field of relational SQL databases and have the task to get familiar with MySQL oder MariaDB. This training teaches you the basics of MySQL.

Requirements

You are ideally already familiar with the SQL language and know-how to use Linux or Windows systems.

Audience

Future MySQL application developer
MySQL and MariaDB database administrators
System administrators with MySQL database responsibility

Installation of MySQL
Configuration of MySQL
Starting and stopping of MySQL
MySQL applications and the command line
Creating database schemata and user
MySQL architecture and storage engines
Managing user privileges
Security and upgrade
Backup, restore and Recovery
Monitoring of MySQL
MySQL log files
Non standard compliant MySQL special commands

Duration

2 days

Booking trainings

Trainings for Germany can be booked on-line here and trainings in Switzerland here.

Advanced trainings

SQL beginner training

oli.sennhauser@fromdual.com (Oli Sennhauser) — Tue, 29 Dec 2015 16:43:11 +0000

You are new in the field of relational SQL databases and have the task to learn the SQL language. This training teaches you the SQL basics.

Requirements

You are an experienced user of Linux or Windows systems and you ideally have already learned another programming language.

Audience

Future MySQL application developer
Future MySQL and MariaDB database administrators
System administrators with MySQL database responsibility
Business analysts

SQL, relations and relational databases
Connecting to and accessing databases
SELECT, WHERE, JOIN
Functions
GROUP BY, ORDER BY, DISTINCT
UNION and sub queries
DML commands: INSERT, UPDATE and DELETE
DDL commands: CREATE, ALTER, DROP
Data types
Indexes
Views
Query Tuning basics

Duration

3 days

Booking trainings

Trainings for Germany can be booked on-line here and trainings in Switzerland here.

Advanced trainings

MariaDB, Galera and MySQL training class schedule

oli.sennhauser@fromdual.com (Oli Sennhauser) — Tue, 29 Dec 2015 16:39:58 +0000

We offer our MySQL and MariaDB trainings together with well-respected training organizations: The Linuxhotel in Essen (Germany), the Heinlein Academy in Berlin (Germany) and GFU Cyrus AG in Cologne (Germany). Our own MySQL and MariaDB training classes are hold in the building of the HSO in Zürich (Switzerland).

If you prefer a MySQL or MariaDB in-house training at your location and if you provide the infrastructure we are happy to train you on-site either in German or English as well.

Further dates or dates in Zurich on request. During the year more dates can come along.

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MariaDB, Galera und MySQL training modules

oli.sennhauser@fromdual.com (Oli Sennhauser) — Tue, 29 Dec 2015 16:36:34 +0000

FromDual offers different MySQL, Galera Cluster and MariaDB training modules. For training dates see our MySQL and MariaDB training class schedule.

SQL for Beginners (3 days)

This training is made for all who want to learn the basics of the SQL language. Future DBAs, database developers and data analysts.

MySQL and MariaDB for Beginners (2 days)

This MySQL and MariaDB training is made for those who want to learn the basics of the MySQL database system. Future MySQL DBAs and MySQL database developers.

MySQL and MariaDB for Developers (3 days)

This MySQL and MariaDB training is made for application developers or DevOps who want to learn more specific MySQL development features beside the SQL language.

Advanced MySQL and MariaDB (5 days)

This MySQL and MariaDB training is made for MySQL DBAs or DevOps who have to operate more demanding MySQL database servers, architects who need to know more about complex MySQL architectures and developers who want to know more about how applications can interact with complex MySQL architectures.

MySQL Enterprise for advanced users (3 days)

This MySQL Enterprise training is made for MySQL Enterprise DBAs or DevOps who have to operate more demanding MySQL Enterprise database servers, architects who need to know more about complex MySQL Enterprise architectures and developers who want to know more about how applications can interact with complex MySQL Enterprise architectures.

Galera Cluster for MySQL and MariaDB (3 days)

This MySQL and MariaDB training is made for DBAs or DevOps who want to learn how to set-up, configure and operate a Galera Cluster.

MySQL Binary Log and original SQL statement

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 21 Oct 2015 05:16:36 +0000

Hello all

we use MySQL binary logging with binlog_format = row. With mysqlbinlog -v binary-log.000001 we can see proximately how the original query looked like. But this is a transformation from row events into pseudo SQL statements.

How can we see the original SQL statements again?

Regards,
Oli

MySQL Binary Log Filter does not work

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 21 Oct 2015 05:23:36 +0200

Problem

We use the following binary log filter for filtering out some schemata.

binlog-ignore-db = mysql, information_schema, test

What is wrong with this filter it somehow does not work: :-(

Solution

there are different things to mention:

The dash (-) notation is for command line options (--binlog-ignore-db) the underscore (_) is for the MySQL configuration file (binlog_ignore_db = ...). The configuration accepts both but is is not good style.
Then because MySQL database names can contain special characters and commas (,) your filter is interpreted as database name "mysql, information_schema, test". This is possibly not what you intended. You have to put every database filter into its own separate line like this:
```
binlog_ignore_db = mysqlbinlog_ignore_db = information_schemabinlog_ignore_db = test
```
To specify multiple databases you must use multiple instances of this option. Because database names can contain commas, the list will be treated as the name of a single database if you supply a comma-separated list.

http://dev.mysql.com/doc/refman/5.6/en/r...nlog-do-db

Further information_schema is not replicated anyway so this information is obsolete.
Then we at FromDual consider it as a bad idea to filter on the master because then the information are NOT contained in the Binary Logs which are needed for a proper point-in-time-recovery (PiTR).

MySQL Replication Slave is lagging more and more

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 18 Sep 2015 05:36:36 +0200

Problem

My MySQL Replication Slave is lagging more and more and I have no clue why. This happens since last weekends application change. I see that one Core is running at 100% user time but the I/O system is nearly completely idle. Any help is appreciated!

Solution

I assume this is a known problem related to MySQL Row Based Replication with tables on the Slave without Primary Keys.

Please check:

If Replication is Row Based (SHOW GLOBAL VARIABLES LIKE ‘binlog_format’; )
If there are some tables on the Slave without a Primary Key
If the currently executed event by the SQL thread is affecting one of those Primary Key less tables
You can additionally check with SHOW GLOBAL STATUS WHERE variable_name IN (‘Handler_read_rnd_next’, ‘Innodb_rows_read’); if there are more reads than expected. The first one is an indication of full table scans which would support my theory.

Download Nagios/Icinga Plugins

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 07 Aug 2015 15:45:57 +0000

Nagios/Icinga plugins for MySQL and MariaDB

Nagios and Icinga compatible plugins to monitor MySQL, Galera Cluster, MariaDB and Percona Server. If you use Nagios or Icinga these are the MySQL monitoring plugins you must have.

Get the Latest release.

Download FromDual Ops Center for MariaDB and MySQL (focmm)

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 07 Aug 2015 15:44:36 +0000

FromDual Ops Center for MariaDB and MySQL (focmm)

The FromDual Ops Center for MariaDB, MySQL and Galera Cluster helps you to operate your complex MariaDB/MySQL database set-ups with and easy to use Graphical User Interface (Web-GUI). Master/Slave- and Master/Master-Replication, Galera Cluster and VIP failover, etc. is possible.

Get the Latest release.

Download Performance Monitor

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 07 Aug 2015 15:41:50 +0000

FromDual Performance Monitor for MySQL and MariaDB including MaaS

The FromDual Performance Monitor for MySQL, Galera Cluster, MariaDB and Percona Server is a Monitoring solution based on Zabbix. Its various alerts, advisors and graphs help you to monitor and operate your MySQL databases. This solution is also available as Monitoring as a Service solution if you want to avoid the hassle of installing your own monitoring solution.

Get the Latest release.

Download FromDual Backup and Recovery Manager

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 07 Aug 2015 15:40:28 +0000

FromDual Backup and Recovery Manager (brman) for MariaDB and MySQL

The FromDual Backup and Recovery Manager (brman) for MariaDB and MySQL is an easy to use software to do Backup, Restore and Point-in-Time-Recovery for MySQL, Galera Cluster, MariaDB and Percona Server. It integrates the utilities mysqldump, mysql, mariabackup, xtrabackup and mysqlbackup (MySQL Enterprise Backup).

Get the Latest release.

MySQL Replication Slave with corrupt Relay Logs

oli.sennhauser@fromdual.com (Oli Sennhauser) — Thu, 16 Jul 2015 19:19:36 +0200

Problem

MySQL Replication Slave stuck because its disk run full. After restarting the Slave MySQL replication was broken with the following error:

Relay log read failure: Could not parse relay log event entry. The possible reasons are: the master’s binary log is corrupted (you can check this by running ‘mysqlbinlog’ on the binary log), the slave’s relay log is corrupted (you can check this by running ‘mysqlbinlog’ on the relay log), a network problem, or a bug in the master’s or slave’s MySQL code. If you want to check the master’s binary log or slave’s relay log, you will be able to know their names by issuing ‘SHOW SLAVE STATUS’ on this slave.

How can I fix this? My Master is 800 Gbyte and it will take ages to set-up a new Slave from scratch…

Solution

In this case possibly the reason of your MySQL Replication Relay Log corruption was the disk full state and not a problem on the master.

Please first free disk space, then you can stop the MySQL Slave and point it to the location where the SQL Thread was writing to when the disk went full with:

CHANGE MASTER TO master_log_file='...', master_log_pos=...;

Those values you get from SHOW SLAVE STATUS\G

Relay_Master_Log_File: binary-log.000042
Exec_Master_Log_Pos: 584

After starting the MySQL Slave again it should catch up as long as the MySQL Binary Logs are still available on the Master. Otherwise you have to apply them manually to the MySQL Slave...

Search with special characters

oli.sennhauser@fromdual.com (Oli Sennhauser) — Mon, 18 May 2015 07:36:00 +0000

How can I search the following string in a text field: ‘%newline,tabluator,b)%’?

How is a correct MariaDB/MySQL backup done?

oli.sennhauser@fromdual.com (Oli Sennhauser) — Mon, 18 May 2015 07:40:00 +0200

You find many different possibilities how to do a MariaDB/MySQL backup with mariadb-dump/mysqldump. But which one is the correct one?

Correct `mariadb-dump`/`mysqldump` backup

Correct is a question of definition… I suggest starting with the following command for a full backup:

For `my.cnf`

$ BACKUP_TIMESTAMP=`date '+%Y-%m-%d_%H-%M-%S'`
$ BACKUP_DIR='/mybackupdir'
$ cp /etc/my.cnf $BACKUP_DIR/my_$BACKUP_TIMESTAMP.cnf

For MariaDB/MySQL databases with MyISAM or Aria tables

$ BACKUP_TIMESTAMP=`date '+%Y-%m-%d_%H-%M-%S'`
$ BACKUP_DIR='/mybackupdir'
$ mariadb-dump --user=root --all-databases --lock-all-tables --master-data=1 \
 --flush-privileges --flush-logs --triggers --routines --events \
 --hex-blob > $BACKUP_DIR/full_dump_$BACKUP_TIMESTAMP.sql

For MariaDB/MySQL databases with InnoDB tables only

$ BACKUP_TIMESTAMP=`date '+%Y-%m-%d_%H-%M-%S'`
$ BACKUP_DIR='/mybackupdir'
$ mysqldump --user=root --all-databases --single-transaction --master-data=1 \
 --flush-privileges --flush-logs --triggers --routines --events \
 --hex-blob > $BACKUP_DIR/full_dump_$BACKUP_TIMESTAMP.sql

--flush-privileges works since 5.1.12
--flush-logs has a bug (#61854) in MySQL 5.5 which fixed in 5.5.21.
--triggers seems to be enabled by default now. It’s unclear to me since when.
While a --single-transaction dump is in process, to ensure a valid dump file (correct table contents and binary log coordinates), no other connection should use the following statements: ALTER TABLE, CREATE TABLE, DROP TABLE, RENAME TABLE, TRUNCATE TABLE. A consistent read is not isolated from those statements, so use of them on a table to be dumped can cause the SELECT that is performed by mysqldump to retrieve the table contents to obtain incorrect contents or fail.
With mysqldump from Percona you should also use --lock-for-backup.

If you want to be on the safe side use the FromDual Backup Manager for MariaDB and MySQL.

`--dump-history`

Since MariaDB 10.11 it would be good to use --dump-history if MariaDB …

Could not increase number of max_open_files

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sun, 28 Dec 2014 15:37:36 +0000

Hello all, on some Linux systems I get the following warning during my MySQL database start-up:

[Warning] Buffered warning: Could not increase number of max_open_files to more than 1024 (request: 8192)
[Warning] Buffered warning: Changed limits: max_connections: 214 (requested 505)
[Warning] Buffered warning: Changed limits: table_cache: 400 (requested 512)

What does it mean and is that something I should care about?

Warning user entry ignored in MySQL error log

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sun, 28 Dec 2014 15:30:36 +0000

Hello all,

I am getting some MySQL warnings in the error log during the start-up:

[Warning] 'user' entry 'root@master' ignored in --skip-name-resolve mode.
[Warning] 'proxies_priv' entry '@ root@laptop4' ignored in --skip-name-resolve mode.

Please suggest how can I prevent such warnings in the MySQL error log?

innodb_checkpoint_age in plain MySQL?

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sat, 27 Dec 2014 15:45:00 +0000

In Percona Server we have a STATUS variable indicating roughly possible recovery time:

Combined size of InnoDB log files defines how many changes not reflected in the tablespace we may have where innodb_checkpoint_age shows how much changes we actually have at the current moment, being an actual driving factor of recovery time. If you have very large log files allocated but for your workload innodb_checkpoint_age stays low chances are recovery will be quick.
[ InnoDB crash recovery speed in MySQL 5.6
]

These numbers are not available in plain MySQL. How can we calculate this value in plain MySQL?

Support policy for MariaDB, MySQL and PostgreSQL

oli.sennhauser@fromdual.com (Oli Sennhauser) — Tue, 23 Dec 2014 15:46:54 +0100

MariaDB Lifetime Support Matrix for MariaDB Releases
MariaDB Corp Enterprise Support Subscriptions
MySQL Lifetime Support Matrix for MySQL Releases
Oracle Corp Enterprise Support Subscriptions for MySQL
PostgreSQL Versioning Policy

Lifetime Support Matrix for MariaDB Releases

Major version	GA date	LTS	Support end
MariaDB Database 5.1	February 2010	x	February 2015
MariaDB Database 5.2	November 2010	x	November 2015
MariaDB Database 5.3	February 2012	x	March 2017
MariaDB Database 5.5	April 2012	x	March 2020
MariaDB Database 10.0	March 2014	x	March 2019
MariaDB Database 10.1	October 2015	x	October 2020
MariaDB Database 10.2	May 2017	x	May 2022
MariaDB Database 10.3	May 2018	x	May 2023
MariaDB Database 10.4	June 2019	x	June 2024
MariaDB Database 10.5	June 2020	x	June 2025
MariaDB Database 10.6	July 2021	x	July 2026
MariaDB Database 10.7 ¹	February 2022		February 2023
MariaDB Database 10.8	May 2022		May 2023
MariaDB Database 10.9	August 2022		August 2023
MariaDB Database 10.10	November 2022		November 2023
MariaDB Database 10.11	February 2023	x	February 2028
MariaDB …

FromDual repositories

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sun, 07 Dec 2014 13:54:31 +0000

Overview

FromDual provides software repositories for their MariaDB/MySQL related software:

DEB Repository for Debian and Ubuntu

For Debian and Ubuntu: Create a file /etc/apt/sources.list.d/FromDual.list and add the following information to it:

source /etc/os-release
# ID : debian or ubuntu
# VERSION_CODENAME: buster bullseye focal jammy

apt update
apt install gpg curl
mkdir -p /usr/share/keyrings
chmod 755 /usr/share/keyrings
curl https://support.fromdual.com/admin/download/repos/${ID}/${VERSION_CODENAME}/fromdual-repo.pgp | gpg --dearmor --yes --output /usr/share/keyrings/fromdual-repo.pgp

cat >/etc/apt/sources.list.d/FromDual.list <<_EOF
#
# /etc/apt/sources.list.d/FromDual.list
#
deb [signed-by=/usr/share/keyrings/fromdual-repo.pgp] https://support.fromdual.com/admin/download/repos/${ID}/${VERSION_CODENAME} /
_EOF

Then update the local cache by running the following command:

apt update

To see if you were successful run:

apt search fromdual
Sorting... Done
Full Text Search... Done
brman/unknown 2.2.5-1 all
 Backup and Recovery Manager for MariaDB, MySQL and Percona Server.

focmm/unknown 1.2.0-1 all
 Operator GUI to manage MariaDB and MySQL database farms.

fpmmm/unknown 2.1.0-2-ubuntu all
 Monitoring a MySQL or MariaDB instance using Zabbix - the agent part

grep 'Package:' /var/lib/apt/lists/support.fromdual.com_admin_download_repos_*
Package: brman
Package: focmm
Package: fpmmm
Package: glb

Go Back

RPM Repository for Redhat, Oracle Linux, Rocky Linux, AlmaLinux, CentOS and Fedora

For RedHat, Oracle Linux, Rocky Linux, AlmaLinux, CentOS and Fedora: Create a file /etc/yum.repos.d/FromDual.repo and add the following information to it:

source /etc/os-release
VERSION=$(echo ${VERSION_ID} | cut -d. -f1)
cat >/etc/yum.repos.d/FromDual.repo <<_EOF
#
# /etc/yum.repos.d/FromDual.repo
#
[FromDual]
name=FromDual …

Test

oli.sennhauser@fromdual.com (Oli Sennhauser) — Mon, 10 Nov 2014 13:14:35 +0000

A test page in English…

socat dependency is also missing

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 22 Oct 2014 16:35:28 +0200

dpkg --force-all -i socat_1.7.2.3-1_amd64.deb

Ugly way to install MySQL Galera Cluster 5.6 on Ubuntu 14.04

oli.sennhauser@fromdual.com (Oli Sennhauser) — Mon, 20 Oct 2014 21:26:22 +0000

I wanted to install MySQL Galera Cluster 5.6 on the new Ubuntu 14.04 with provided packages. It was a bit tricky to make it work.

apt-get update
apt-get install mysql-server # this is still 5.5
# from universe
apt-get install mysql-server-5.6 mysql-client-5.6 mysql-client-core-5.6

So far so good. Everything works fine as MySQL 5.6.

Now we have to download Galera 5.6 from Coderships website:

wget https://launchpad.net/galera/3.x/25.3.5/+download/galera-25.3.5-amd64.deb
wget https://launchpad.net/codership-mysql/5.6/5.6.16-25.5/+download/mysql-server-wsrep-5.6.16-25.5-amd64.deb

apt-get install libssl0.9.8 # Should be resolved by the package?
dpkg -i galera-25.3.5-amd64.deb

And then the ugly part:

dpkg --force-all -i mysql-server-wsrep-5.6.16-25.5-amd64.deb

Finally:

 # /etc/mysql/conf.d/wsrep.cnf

[mysqld]
wsrep_provider = /usr/lib/galera/libgalera_smm.so
wsrep_cluster_address = "gcomm://"

And to activate the changes:

service mysql restart

If you find a better way, please let me know…

Query Cache and table names with special characters

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sat, 18 Oct 2014 22:05:25 +0200

We found that there were similar problems with table names with a dash/minus in the name (e.g. `table-name`).
This seems to be fixed in MySQL 5.6.9 and 5.7.0. See bugs #55556, #62237 and #64821.

Comparing MySQL, MariaDB and Percona Server

oli.sennhauser@fromdual.com (Oli Sennhauser) — Mon, 29 Sep 2014 09:22:08 +0000

	MySQL	Percona	MariaDB
Company	Oracle Corp. (former MySQL AB)	Percona LLC	MariaDB Corp. (former SkySQL)
FromDual support
GA versions	5.5, 5.6	5.5, 5.6	5.5, 10.0
Galera Cluster	supported	supported	supported
License	GPL, commercial (OEM!)	GPL	GPL, LGPL, BSD
Ancestry	Mother of all	Branch of actual release	Fork of MySQL 5.5
Storage Engines	Archive, Blackhole, CSV, Federated (disabled), InnoDB (default), Memory, MyISAM	Archive, Blackhole, CSV, Federated (disabled), InnoDB (default), Memory, MyISAM, TokuDB	Archive, Aria (crash-safe MyISAM), Blackhole, Cassandra, CSV, FederatedX, InnoDB (default), Memory, MyISAM, OQGraph (Graph-SE), TokuDB
Storage Engine enforcement		yes
Fulltext search	MyISAM: yes InnoDB: yes	MyISAM: yes InnoDB: yes	MyISAM: yes Aria: yes InnoDB: yes, Sphinx-SE
Partitions	available	available	available
Plugins	Auth, Auth Socket, MemcacheD, SemiSync Repl	Auth PAM, Auth Socket, Handlersocket, MemcacheD, SemiSync Repl	Auth PAM, Auch Socket, Connect SE, Handlersocket, Sequence, Sphinx, Spider, QueryCache Info, SemiSync Repl
MemcacheD	available
virtual Columns	Since 5.7.6		since 5.2
Performance
General	All 3 branches/forks have roughly the same performance. They mostly distinguish in features not in performance.
`PERFORMANCE_SCHEMA`	enabled (5.6)	enabled (5.6), userstats	enabled (10.0)
Thread Pool	5.5, commercial plugin	5.5 and 5.6	5.1 - 5.3 (old), 5.5 (new)
`DML EXPLAIN`	5.6	5.6?
JSON `EXPLAIN`	5.6	5.6?
Optimizer Trace	5.6	5.6?
Table elimination			available
Security
Roles			since 10.0.5
Password expiration	since 5.6	since 5.6	since 10.0?
Password validation	Plugin since 5.6.6	Plugin since 5.6	Worklog, comes in 10.1/10.2
Password complexity	commercial?
PAM Authentication	MySQL 5.5, commercial plugin	since 5.5	since 5.2
Backup	mysqldump, mysqlbackup	mysqldump, XtraBackup	mysqldump, XtraBackup
Audit Plugin	5.5 a, b MyAfee Audit Plugin	5.5 and 5.6 MyAfee Audit Plugin	5.5 MyAfee Audit Plugin
Slow Query Log	available	available, improved …

gethostbyname

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 08 Aug 2014 10:31:15 +0200

Hello poorx7,

I see, that you are using an old version of mpm: 0.9.2 the current version is 0.9.3 which you can download from here.

0.9.3 has some fixes in the area you are currently struggling... See the Release Notes.

And here it looks like something is wrong with your mpm configuration:

5738:2014-08-06 15:05:51.379 - DBG : /usr/bin/zabbix_sender --zabbix-server --port 10051 --host 'debug' --key FromDual.server.check --value '1' -vv
zabbix_sender [5742]: DEBUG: send value error: gethostbyname() failed for '--port': [3] Unknown server error
Sending failed.

host is missing or is wrong. Can you please send me your mpm configuration file so I can see if our error catching is not good enough?

Thanks,
Oli

wrong number of rows

oli.sennhauser@fromdual.com (Oli Sennhauser) — Tue, 03 Jun 2014 16:08:09 +0200

Can you repeat this at the command line? This is such a basic problem that I expect that it has nothing to do with MySQL but with your environment/application/set-up or testing method…

Check interval

oli.sennhauser@fromdual.com (Oli Sennhauser) — Tue, 03 Jun 2014 16:04:28 +0200

An mpm agent run should not be started before the previous has ended. To make this sure we have some internal checks (and a kill). So the interval should be bigger than the duration of a (the longest) run. Typically we run mpm every 10 seconds and that is fine in most of the cases. But our biggest DB is around 250 Gbyte. So I am wondering why your runs take much longer. Should be visible by the timestamps of the log (debug) file where most of the time is spent.

TERM signal

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 28 May 2014 16:58:57 +0200

As mentioned earlier (now with a nicer error message) somebody or something is killing the actual mpm agent job. This is typically a next mpm agent job who has to wait too long for the actual one. The question is more: Why is the first one lasting for so long…

MySQL Performance Monitor v0.9.3 release

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sat, 24 May 2014 15:25:36 +0200

It is done: v0.9.3.

bug in master module found and fixed

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sat, 24 May 2014 13:06:00 +0200

The following fixes in the file lib/FromDualMySQLmaster.pm should do the job:

- $$status_ref{'Binlog_file'} = '';
+ $$status_ref{'Binlog_file'} = 'none';

- $$status_ref{'Binlog_do_filter'} = '';
- $$status_ref{'Binlog_ignore_filter'} = '';
+ $$status_ref{'Binlog_do_filter'} = 'none';
+ $$status_ref{'Binlog_ignore_filter'} = 'none';

- $$status_ref{'Binlog_do_filter'} = $ref->{'Binlog_Do_DB'};
- $$status_ref{'Binlog_ignore_filter'} = $ref->{'Binlog_Ignore_DB'};
+ $$status_ref{'Binlog_do_filter'} = $ref->{'Binlog_Do_DB'} eq '' ? "''" : $ref->{'Binlog_Do_DB'};
+ $$status_ref{'Binlog_ignore_filter'} = $ref->{'Binlog_Ignore_DB'} eq '' ? "''" : $ref->{'Binlog_Ignore_DB'};

I hope we will have a new release soon...

By the way I would say that this bug was introduced in v0.9.1 already, more than 13 months ago... :-(

binlog_ignore_filter in master module broken

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 21 May 2014 12:42:46 +0200

Thanks, got it:

hostnameX FromDual.MySQL.master.Binlog_ignore_filter 1400661892

Cache file broken

oli.sennhauser@fromdual.com (Oli Sennhauser) — Tue, 20 May 2014 21:34:16 +0200

I think I see what went wrong. Can you please send me the first 10 lines of the file /tmp/FromDualAgentCache.hostnameX.cache:

shell> head -n 10 /tmp/FromDualAgentCache.hostnameX.cache

exit with rc=1

oli.sennhauser@fromdual.com (Oli Sennhauser) — Thu, 15 May 2014 16:21:58 +0200

I see… The only part in the code where exit code 1 can be reached is the signal TERM trap. Either somebody killed the process or mpm killed a long running former mpm process automatically. How do you start mpm agent?

Master module ist missing

oli.sennhauser@fromdual.com (Oli Sennhauser) — Thu, 15 May 2014 14:29:40 +0200

It looks like you did not enable the master module: INFO: Modules for section hostnameX: mpm server process mysql innodb slave

mpm Module Master

oli.sennhauser@fromdual.com (Oli Sennhauser) — Thu, 15 May 2014 10:53:51 +0200

Hello Obyis

Hmm... In the master module nothing has changed since v0.9.1 if I searched correctly...
It looks like the problem is located in sending the cache file.
Can you please enabled Debug = 4 and send us the output when the error happens?

Thanks,
Oli

See bug and fix

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 09 May 2014 07:19:24 +0200

We found a pretty uncomfortable bug. It can be fixed easily by yourself or wait for the release of version 0.9.3 coming out soon. For more information see: here.

Bug in v0.9.2

oli.sennhauser@fromdual.com (Oli Sennhauser) — Thu, 08 May 2014 20:18:27 +0200

This seems to be a bug in v0.9.2 which happens when you have deadlock error messages in SHOW ENGINE INNODB STATUS output. (bug #139).

Will be fixed in v0.9.3

Workaround: fix lines 51 and 64 in lib/InnoDbStatus.pm as follows:

- $sha1 = Digest::SHA1->new;
+ $sha1 = Digest::SHA->new;

or as described in Abdel-Mawlas comment above.

Ubuntu intallation advice

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 07 May 2014 07:02:34 +0200

Hello

oh, I see. The installation advice for Ubuntu/Debian has a bug. libdigest-sha1-perl does not exits (any more?). I fixed the installation docu.

But apt-get install libdigest-sha-perl should definitely work.

Oli

Re: Steps of setting up shared database server on FromDual GmbH

Verification of the formula

FPMMM Agent: got TERM signal

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