Feed aggregator

Taxonomy upgrade extras: multi-source replicationmysql-replicationreplicationMulti-Master Replicationfan-in replicationrow filteringGTID

A MySQL customer of FromDual has different manufacturing plants spread across the globe. They are operated by local companies. FromDuals customer wants to maintain the manufacturing receipts centralized in a MySQL database in the Head Quarter in Europe. Each manufacturing plant should only see their specific data.

Manufacturing log information should be reported backup to European Head Quarter MySQL database.

The process was designed as follows:

Preparation of Proof of Concept (PoC)

To simulate all cases we need different schemas. Some which should be replicated, some which should NOT be replicated:

CREATE DATABASE finance; CREATE TABLE finance.accounting ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `data` varchar(255) DEFAULT NULL, `ts` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, PRIMARY KEY (`id`), KEY `data_rename` (`data`) ); CREATE DATABASE crm; CREATE TABLE crm.customer ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `data` varchar(255) DEFAULT NULL, `ts` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, PRIMARY KEY (`id`), KEY `data_rename` (`data`) ); CREATE DATABASE erp; -- Avoid specifying Storage Engine here!!! CREATE TABLE erp.manufacturing_data ( id INT UNSIGNED NOT NULL AUTO_INCREMENT , manufacture_plant VARCHAR(32) , manufacture_info VARCHAR(255) , PRIMARY KEY (id) , KEY (manufacture_plant) ); CREATE TABLE erp.manufacturing_log ( id INT UNSIGNED NOT NULL AUTO_INCREMENT , manufacture_plant VARCHAR(32) , log_data VARCHAR(255) , PRIMARY KEY (id) , KEY (manufacture_plant) );
MySQL replication architecture

Before you start with such complicated MySQL set-ups it is recommended to make a little sketch of what you want to build:

Preparing the Production Master database (Prod M1)

To make use of all the new and cool features of MySQL we used the new GTID replication. First we set up a Master (Prod M1) and its fail-over System (Prod M2) in the customers Head Quarter:

# /etc/my.cnf [mysqld] binlog_format = row # optional log_bin = binary-log # mandatory, also on Slave! log_slave_updates = on # mandatory gtid_mode = on # mandatory enforce_gtid_consistency = on # mandatory server-id = 39 # mandatory

This step requires a system restart (one minute downtime).

Preparing the Production Master standby database (Prod M2)

On Master (Prod M1):

GRANT REPLICATION SLAVE ON *.* TO 'replication'@'192.168.1.%' IDENTIFIED BY 'secret'; mysqldump -u root --set-gtid-purged=on --master-data=2 --all-databases --triggers --routines --events > /tmp/full_dump.sql

On Slave (Prod M2):

CHANGE MASTER TO MASTER_HOST='192.168.1.39', MASTER_PORT=3306 , MASTER_USER='replication', MASTER_PASSWORD='secret' , MASTER_AUTO_POSITION=1; RESET MASTER; -- On SLAVE! system mysql -u root < /tmp/full_dump.sql START SLAVE;

To make it easier for a Slave to connect to its master we set a VIP in front of those 2 database servers (VIP Prod). This VIP should be used by all applications in the head quarter and also the filter engines.

Set-up filter engines (Filter BR and Filter CN)

To make sure every manufacturing plant sees only the data it is allowed to see we need a filtering engine between the production site and the manufacturing plant (Filter BR and Filter CN).

To keep this filter engine lean we use a MySQL instance with all tables converted to the Blackhole Storage Engine:

# /etc/my.cnf [mysqld] binlog_format = row # optional log_bin = binary-log # mandatory, also on Slave! log_slave_updates = on # mandatory gtid_mode = on # mandatory enforce_gtid_consistency = on # mandatory server-id = 36 # mandatory default_storage_engine = blackhole

On the production master (Prod M1) we get the data as follows:

mysqldump -u root --set-gtid-purged=on --master-data=2 --triggers --routines --events --no-data --databases erp > /tmp/erp_dump_nd.sql

The Filter Engines (Filter BR and CN) are set-up as follows::

-- Here we can use the VIP! CHANGE MASTER TO master_host='192.168.1.33', master_port=3306 , master_user='replication', master_password='secret' , master_auto_position=1; RESET MASTER; -- On SLAVE! system cat /tmp/erp_dump_nd.sql | sed 's/ ENGINE=[a-zA-Z]*/ ENGINE=blackhole/' | mysql -u root START SLAVE;

Do not forget to also create the replication user on the filter engines.

GRANT REPLICATION SLAVE ON *.* TO 'replication'@'192.168.1.%' IDENTIFIED BY 'secret';
Filtering out all non ERP schemata

We only want the erp schema to be replicated to the manufacturing plants, not the crm or the finance application. This we achieve with the following option on the filter engines:

# /etc/my.cnf [mysqld] replicate_do_db = erp replicate_ignore_table = erp.manufacturing_log
MySQL row filtering

To achieve row filtering we use TRIGGERS. Make sure they are not replicated further down the hierarchy:

SET SESSION SQL_LOG_BIN = 0; use erp DROP TRIGGER IF EXISTS filter_row; delimiter // CREATE TRIGGER filter_row BEFORE INSERT ON manufacturing_data FOR EACH ROW BEGIN IF ( NEW.manufacture_plant != 'China' ) THEN SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = 'Row was filtered out.' , CLASS_ORIGIN = 'FromDual filter trigger' , SUBCLASS_ORIGIN = 'filter_row' , CONSTRAINT_SCHEMA = 'erp' , CONSTRAINT_NAME = 'filer_row' , SCHEMA_NAME = 'erp' , TABLE_NAME = 'manufacturing_data' , COLUMN_NAME = '' , MYSQL_ERRNO = 1644 ; END IF; END; // delimiter ; SET SESSION SQL_LOG_BIN = 0;

Up to now this would cause to stop replication for every filtered row. To avoid this we tell the Filtering Slaves to skip this error number:

# /etc/my.cnf [mysqld] slave_skip_errors = 1644
Attaching production manufacturing Slaves (Man BR M1 and Man CN M1)

When we have finished everything on our head quarter site. We can start with the manufacturing sites (BR and CN):

On Master (Prod M1):

mysqldump -u root --set-gtid-purged=on --master-data=2 --triggers --routines --events --where='manufacture_plant="Brazil"' --databases erp > /tmp/erp_dump_br.sql mysqldump -u root --set-gtid-purged=on --master-data=2 --triggers --routines --events --where='manufacture_plant="China"' --databases erp > /tmp/erp_dump_cn.sql

On the Manufacturing Masters (Man BR M1 and Man BR M2). Here we do NOT use a VIP because we think a blackhole storage engine is robust enough as master:

CHANGE MASTER TO master_host='192.168.1.43', master_port=3306 , master_user='replication', master_password='secret' , master_auto_position=1; RESET MASTER; -- On SLAVE! system cat /tmp/erp_dump_br.sql | mysql -u root START SLAVE;

The standby manufacturing (Man BR M2 and Man CN M2) database is created in the same way as the production manufacturing database on the master.

Testing replication from HQ to manufacturing plants

First we make sure, crm and finance is not replicated out and replication also does not stop (on Prod M1):

INSERT INTO finance.accounting VALUES (NULL, 'test data over VIP', NULL); INSERT INTO finance.accounting VALUES (NULL, 'test data over VIP', NULL); INSERT INTO crm.customer VALUES (NULL, 'test data over VIP', NULL); INSERT INTO crm.customer VALUES (NULL, 'test data over VIP', NULL); UPDATE finance.accounting SET data = 'Changed data'; UPDATE crm.customer SET data = 'Changed data'; DELETE FROM finance.accounting WHERE id = 1; DELETE FROM crm.customer WHERE id = 1; SELECT * FROM finance.accounting; SELECT * FROM crm.customer; SHOW SLAVE STATUS\G

The schema filter seems to work correctly. Then we check if also the row filter works correctly. For this we have to run the queries in statement based replication (SBR)! Otherwise the trigger would not fire:

use mysql INSERT INTO erp.manufacturing_data VALUES (NULL, 'China', 'Highly secret manufacturing info as RBR.'); INSERT INTO erp.manufacturing_data VALUES (NULL, 'Brazil', 'Highly secret manufacturing info as RBR.'); -- This needs SUPER privilege... :-( SET SESSION binlog_format = STATEMENT; -- Caution those rows will NOT be replicated!!! -- See filter rules for SBR INSERT INTO erp.manufacturing_data VALUES (NULL, 'China', 'Highly secret manufacturing info as SBR lost.'); INSERT INTO erp.manufacturing_data VALUES (NULL, 'Brazil', 'Highly secret manufacturing info as SBR lost.'); use erp INSERT INTO manufacturing_data VALUES (NULL, 'China', 'Highly secret manufacturing info as SBR.'); INSERT INTO manufacturing_data VALUES (NULL, 'Brazil', 'Highly secret manufacturing info as SBR.'); INSERT INTO manufacturing_data VALUES (NULL, 'Germany', 'Highly secret manufacturing info as SBR.'); INSERT INTO manufacturing_data VALUES (NULL, 'Switzerland', 'Highly secret manufacturing info as SBR.'); SET SESSION binlog_format = ROW; SELECT * FROM erp.manufacturing_data;
Production data back to head quarter

Now we have to take care about the production data on their way back to the HQ. To achieve this we use the new MySQL 5.7 feature called multi source replication. For multi source replication the replication repositories must be kept in tables instead of files:

# /etc/my.cnf [mysqld] master_info_repository = TABLE # mandatory relay_log_info_repository = TABLE # mandatory

Then we have to configure 2 replication channels from Prod M1 to their specific manufacturing masters over the VIP (VIP BR and VIP CN):

CHANGE MASTER TO MASTER_HOST='192.168.1.98', MASTER_PORT=3306 , MASTER_USER='replication', MASTER_PASSWORD='secret' , MASTER_AUTO_POSITION=1 FOR CHANNEL "manu_br"; CHANGE MASTER TO MASTER_HOST='192.168.1.99', MASTER_PORT=3306 , MASTER_USER='replication', MASTER_PASSWORD='secret' , MASTER_AUTO_POSITION=1 FOR CHANNEL "manu_cn"; START SLAVE FOR CHANNEL 'manu_br'; START SLAVE FOR CHANNEL 'manu_cn'; SHOW SLAVE STATUS FOR CHANNEL 'manu_br'\G SHOW SLAVE STATUS FOR CHANNEL 'manu_cn'\G

Avoid to configure and activate the channels on Prod M2 as well.

Testing back replication from manufacturing plants

Brazil on Man BR M1:

INSERT INTO manufacturing_log VALUES (1, 'Production data from Brazil', 'data');

China on Man CN M1:

INSERT INTO manufacturing_log VALUES (2, 'Production data from China', 'data');

For testing:

SELECT * FROM manufacturing_log;

Make sure you do not run into conflicts (Primary Key, AUTO_INCREMENTS). Make sure filtering is defined correctly!

To check the different channel states you can use the following command:

SHOW SLAVE STATUS\G or SELECT ras.channel_name, ras.service_state AS 'SQL_thread', ras.remaining_delay , CONCAT(user, '@', host, ':', port) AS user , rcs.service_state AS IO_thread, REPLACE(received_transaction_set, '\n', '') AS received_transaction_set FROM performance_schema.replication_applier_status AS ras JOIN performance_schema.replication_connection_configuration AS rcc ON rcc.channel_name = ras.channel_name JOIN performance_schema.replication_connection_status AS rcs ON ras.channel_name = rcs.channel_name ;
Troubleshooting Inject empty transaction

If you try to skip a transaction as you did earlier (SQL_SLAVE_SKIP_COUNTER) you will face some problems:

STOP SLAVE; ERROR 1858 (HY000): sql_slave_skip_counter can not be set when the server is running with @@GLOBAL.GTID_MODE = ON. Instead, for each transaction that you want to skip, generate an empty transaction with the same GTID as the transaction

To skip the next transaction you have find the ones applied so far:

SHOW SLAVE STATUS\G ... Executed_Gtid_Set: c3611091-f80e-11e4-99bc-28d2445cb2e9:1-20

then tell MySQL to skip this by injecting a new empty transaction:

SET SESSION GTID_NEXT='c3611091-f80e-11e4-99bc-28d2445cb2e9:21'; BEGIN; COMMIT; SET SESSION GTID_NEXT='AUTOMATIC'; SHOW SLAVE STATUS\G ... Executed_Gtid_Set: c3611091-f80e-11e4-99bc-28d2445cb2e9:1-21 START SLAVE;
Revert from GTID-based replication to file/position-based replication

If you want to fall-back from MySQL GTID-based replication to file/position-based replication this is quite simple:

CHANGE MASTER TO MASTER_AUTO_POSITION = 0;
MySQL Support and Engineering

If you need some help or support our MySQL support and engineering team is happy to help you.

FromDual has the pleasure to announce the release of the new version 0.10.1 of its popular Database Performance Monitor for MySQL, MariaDB, Galera Cluster and Percona Server fpmmm.

You can download fpmmm from here.

In the inconceivable case that you find a bug in fpmmm please report it to our Bug-tracker.

Any feedback, statements and testimonials are welcome as well! Please send them to feedback@fromdual.com.

This release contains various minor bug fixes and improvements. Mainly it was a rewrite from Perl into PHP.

New installation of fpmmm v0.10.1

Please follow our mpm installation guide. A specific fpmmm installation guide will follow with the next version.

Prerequisites CentOS 6 # yum install php-cli php-process php-mysqli # cat << _EOF >/etc/php.d/fpmmm.ini variables_order = "EGPCS" date.timezone = 'Europe/Zurich' _EOF rpm -Uvh http://repo.zabbix.com/zabbix/2.2/rhel/6/x86_64/zabbix-release-2.2-1.el6.noarch.rpm yum update yum install zabbix-sender
CentOS 7 # yum install php-cli php-process php-mysqli # cat << _EOF >/etc/php.d/fpmmm.ini variables_order = "EGPCS" date.timezone = 'Europe/Zurich' _EOF rpm -Uvh http://repo.zabbix.com/zabbix/2.2/rhel/7/x86_64/zabbix-release-2.2-1.el7.noarch.rpm yum update yum install zabbix-sender
Ubuntu 14.04 # apt-get install php5-cli php5-mysqlnd # cat << _EOF >/etc/php5/cli/conf.d/fpmmm.ini variables_order = "EGPCS" date.timezone = 'Europe/Zurich' _EOF apt-get install zabbix-agent
OpenSuSE 13.1 # zypper install php5 php5-posix php5-mysql php5-pcntl php5-curl #cat << _EOF >/etc/php5/conf.d/fpmmm.ini variables_order = "EGPCS" date.timezone = 'Europe/Zurich' _EOF zypper addrepo http://download.opensuse.org/repositories/server:/monitoring/openSUSE_13.1 server_monitoring zypper update zypper install zabbix-agent
Upgrade from mpm 0.x to fpmmm 0.10.1 # cd /opt # tar xf /download/fpmmm-0.10.1.tar.gz # rm -f fpmmm # ln -s fpmmm-0.10.1 fpmmm

You further have to replace all mysql_performance_monitor_agent.pl hooks (in Zabbix agent) by bin/fpmmm.

Changes in fpmmm v0.10.1 fpmmm agent

• Defaults in fpmmm.conf.template adapted.
• Item sending prepared for empty strings.
• Log of cachedData more verbose.
• zabbix_sender stuff fixed and made more robust.
• New naming convention fpmmm implemented.
• Connection problems and error catching fixed.
• NDB cluster and PBXT stuff removed and locking made more robust.
• zabbix-sender on SuSE should work now as well. Bug #149.
• exec/system replaced by my_exec.
• Debug parameter replaced by LogLevel parameter, including all templates and warning for deprecation.
• export LC_ALL=C added to all O/S calls to make it language independent.
• Usage added (--help).
• All Perl code replaced by PHP code.
• Bug fix on cache clean-up on corruption.
• Mac OSX (darwin) support added, partially.
• Changed defaults away from /tmp This is no good location for persistent things because of RedHat tmpcleaner job.
• Debugging info added for missing lock file.

fpmmm agent and MaaS

• none.

Various modules

• Regexp pattern fixed for mr_versions.

MySQL module

• Trailing / from datadir is removed.

InnoDB module

• Innodb buffer pool hit ratio rounded to 2 digits.
• Innodb_os_log_written item added.
• InnoDB hash searches item fixed.

Galera module

• Galera status now gathered with causal reads off.

Memcached module

• Memcached stuff activated.

DRBD module

• Bug report on new DRBD fixed.

fpmmm templates for Zabbix

• Security template data typo fixed.
• Templates moved from xml folder to tpl folder and other file structure and renaming.
• InnoDB Flush Log at Transaction Commit Serverity lowered from Warning to Information.

For subscriptions of commercial use of fpmmm please get in contact with us.

Taxonomy upgrade extras: mysqlperformancemonitormonitoringfpmmmmaasperformance monitorrelease

FromDual has the pleasure to announce the release of the new version 0.10.1 of its popular Database Performance Monitor for MySQL, MariaDB, Galera Cluster and Percona Server fpmmm.

You can download fpmmm from here.

In the inconceivable case that you find a bug in fpmmm please report it to our Bug-tracker.

Any feedback, statements and testimonials are welcome as well! Please send them to feedback@fromdual.com.

This release contains various minor bug fixes and improvements. Mainly it was a rewrite from Perl into PHP.

New installation of fpmmm v0.10.1

Please follow our mpm installation guide. A specific fpmmm installation guide will follow with the next version.

Prerequisites CentOS 6 # yum install php-cli php-process php-mysqli # cat << _EOF >/etc/php.d/fpmmm.ini variables_order = "EGPCS" date.timezone = 'Europe/Zurich' _EOF rpm -Uvh http://repo.zabbix.com/zabbix/2.2/rhel/6/x86_64/zabbix-release-2.2-1.el6.noarch.rpm yum update yum install zabbix-sender
CentOS 7 # yum install php-cli php-process php-mysqli # cat << _EOF >/etc/php.d/fpmmm.ini variables_order = "EGPCS" date.timezone = 'Europe/Zurich' _EOF rpm -Uvh http://repo.zabbix.com/zabbix/2.2/rhel/7/x86_64/zabbix-release-2.2-1.el7.noarch.rpm yum update yum install zabbix-sender
Ubuntu 14.04 # apt-get install php5-cli php5-mysqlnd # cat << _EOF >/etc/php5/cli/conf.d/fpmmm.ini variables_order = "EGPCS" date.timezone = 'Europe/Zurich' _EOF apt-get install zabbix-agent
OpenSuSE 13.1 # zypper install php5 php5-posix php5-mysql php5-pcntl php5-curl #cat << _EOF >/etc/php5/conf.d/fpmmm.ini variables_order = "EGPCS" date.timezone = 'Europe/Zurich' _EOF zypper addrepo http://download.opensuse.org/repositories/server:/monitoring/openSUSE_13.1 server_monitoring zypper update zypper install zabbix-agent
Upgrade from mpm 0.x to fpmmm 0.10.1 # cd /opt # tar xf /download/fpmmm-0.10.1.tar.gz # rm -f fpmmm # ln -s fpmmm-0.10.1 fpmmm

You further have to replace all mysql_performance_monitor_agent.pl hooks (in Zabbix agent) by bin/fpmmm.

Changes in fpmmm v0.10.1 fpmmm agent

• Defaults in fpmmm.conf.template adapted.
• Item sending prepared for empty strings.
• Log of cachedData more verbose.
• zabbix_sender stuff fixed and made more robust.
• New naming convention fpmmm implemented.
• Connection problems and error catching fixed.
• NDB cluster and PBXT stuff removed and locking made more robust.
• zabbix-sender on SuSE should work now as well. Bug #149.
• exec/system replaced by my_exec.
• Debug parameter replaced by LogLevel parameter, including all templates and warning for deprecation.
• export LC_ALL=C added to all O/S calls to make it language independent.
• Usage added (--help).
• All Perl code replaced by PHP code.
• Bug fix on cache clean-up on corruption.
• Mac OSX (darwin) support added, partially.
• Changed defaults away from /tmp This is no good location for persistent things because of RedHat tmpcleaner job.
• Debugging info added for missing lock file.

fpmmm agent and MaaS

• none.

Various modules

• Regexp pattern fixed for mr_versions.

MySQL module

• Trailing / from datadir is removed.

InnoDB module

• Innodb buffer pool hit ratio rounded to 2 digits.
• Innodb_os_log_written item added.
• InnoDB hash searches item fixed.

Galera module

• Galera status now gathered with causal reads off.

Memcached module

• Memcached stuff activated.

DRBD module

• Bug report on new DRBD fixed.

fpmmm templates for Zabbix

• Security template data typo fixed.
• Templates moved from xml folder to tpl folder and other file structure and renaming.
• InnoDB Flush Log at Transaction Commit Serverity lowered from Warning to Information.

For subscriptions of commercial use of fpmmm please get in contact with us.

Taxonomy upgrade extras: mysqlperformancemonitormonitoringfpmmmmaasperformance monitorrelease

Taxonomy upgrade extras: mysqlperformancemonitormonitoringfpmmmmaasperformance monitormpm

FromDual has the pleasure to announce the release of the new version 0.10.1 of its popular Database Performance Monitor for MySQL, MariaDB, Galera Cluster and Percona Server fpmmm.

You can download fpmmm from here.

In the inconceivable case that you find a bug in fpmmm please report it to our Bug-tracker.

Any feedback, statements and testimonials are welcome as well! Please send them to feedback@fromdual.com.

This release contains various minor bug fixes and improvements. Mainly it was a rewrite from Perl into PHP.

New installation of fpmmm v0.10.1

Please follow our mpm installation guide. A specific fpmmm installation guide will follow with the next version.

Prerequisites CentOS 6 # yum install php-cli php-process php-mysqli # cat << _EOF >/etc/php.d/fpmmm.ini variables_order = "EGPCS" date.timezone = 'Europe/Zurich' _EOF rpm -Uvh http://repo.zabbix.com/zabbix/2.2/rhel/6/x86_64/zabbix-release-2.2-1.el6.noarch.rpm yum update yum install zabbix-sender
CentOS 7 # yum install php-cli php-process php-mysqli # cat << _EOF >/etc/php.d/fpmmm.ini variables_order = "EGPCS" date.timezone = 'Europe/Zurich' _EOF rpm -Uvh http://repo.zabbix.com/zabbix/2.2/rhel/7/x86_64/zabbix-release-2.2-1.el7.noarch.rpm yum update yum install zabbix-sender
Ubuntu 14.04 # apt-get install php5-cli php5-mysqlnd # cat << _EOF >/etc/php5/cli/conf.d/fpmmm.ini variables_order = "EGPCS" date.timezone = 'Europe/Zurich' _EOF apt-get install zabbix-agent
OpenSuSE 13.1 # zypper install php5 php5-posix php5-mysql php5-pcntl php5-curl #cat << _EOF >/etc/php5/conf.d/fpmmm.ini variables_order = "EGPCS" date.timezone = 'Europe/Zurich' _EOF zypper addrepo http://download.opensuse.org/repositories/server:/monitoring/openSUSE_13.1 server_monitoring zypper update zypper install zabbix-agent
Upgrade from mpm 0.x to fpmmm 0.10.1 # cd /opt # tar xf /download/fpmmm-0.10.1.tar.gz # rm -f fpmmm # ln -s fpmmm-0.10.1 fpmmm

You further have to replace all mysql_performance_monitor_agent.pl hooks (in Zabbix agent) by bin/fpmmm.

Changes in fpmmm v0.10.1 fpmmm agent

• Defaults in fpmmm.conf.template adapted.
• Item sending prepared for empty strings.
• Log of cachedData more verbose.
• zabbix_sender stuff fixed and made more robust.
• New naming convention fpmmm implemented.
• Connection problems and error catching fixed.
• NDB cluster and PBXT stuff removed and locking made more robust.
• zabbix-sender on SuSE should work now as well. Bug #149.
• exec/system replaced by my_exec.
• Debug parameter replaced by LogLevel parameter, including all templates and warning for deprecation.
• export LC_ALL=C added to all O/S calls to make it language independent.
• Usage added (--help).
• All Perl code replaced by PHP code.
• Bug fix on cache clean-up on corruption.
• Mac OSX (darwin) support added, partially.
• Changed defaults away from /tmp This is no good location for persistent things because of RedHat tmpcleaner job.
• Debugging info added for missing lock file.

fpmmm agent and MaaS

• none.

Various modules

• Regexp pattern fixed for mr_versions.

MySQL module

• Trailing / from datadir is removed.

InnoDB module

• Innodb buffer pool hit ratio rounded to 2 digits.
• Innodb_os_log_written item added.
• InnoDB hash searches item fixed.

Galera module

• Galera status now gathered with causal reads off.

Memcached module

• Memcached stuff activated.

DRBD module

• Bug report on new DRBD fixed.

fpmmm templates for Zabbix

• Security template data typo fixed.
• Templates moved from xml folder to tpl folder and other file structure and renaming.
• InnoDB Flush Log at Transaction Commit Serverity lowered from Warning to Information.

For subscriptions of commercial use of fpmmm please get in contact with us.

FromDual has the pleasure to announce the release of the new version 1.2.0 of its popular MySQL, Galera Cluster, MariaDB and Percona Server multi-instance environment MyEnv.

The new MyEnv can be downloaded here.

In the inconceivable case that you find a bug in the MyEnv please report it to our bug tracker.

Any feedback, statements and testimonials are welcome as well! Please send them to feedback@fromdual.com.

Upgrade from 1.1.x to 1.2.0 # cd ${HOME}/product # tar xf /download/myenv-1.2.0.tar.gz # rm -f myenv # ln -s myenv-1.2.0 myenv

If you are using plug-ins for showMyEnvStatus create all the links in the new directory structure:

cd ${HOME}/product/myenv ln -s ../../utl/oem_agent.php plg/showMyEnvStatus/
Changes in MyEnv 1.2.0 MyEnv

• Some minor fixes on init script.
• Introduction of states production, quality, testing and development.
• Colored prompt added for stage production databases.
• All /tmp/*sock moved to /var/run/mysqld.
• up output prepared for bind-address awareness.
• lsb_release dummy implemented.

MyEnv Installer

• Advice for 2 sudo commands in row was wrong.
• Port conflict resolution more verbose.
• Init script replacement check added. Replace init script is distribution aware and auto executable.
• Installer made mode modular and prepared for automatization.
• Installer allows now to run as other user than mysql.
• Bugs in preparing myenv.conf fixed and instance name removed.
• Install routine made more distribution aware.

MyEnv Utilities

• Split partition (split_partition.php) improved.
• Fix of DROP PARTITION (drop_partition.php) was executed in wrong order (new before old).
• Alter Engine script rewritten into PHP (alter_engine.php).
• Alter Engine script handles ROW_FORMAT=FIXED problem correctly now.
• Alter Engine script handles too large Primary Key better.
• Alter Engine script recognizes tables with AUTO_INCREMENT column not at 1st position.
• Purge Binary Log rewritten into PHP (purge_binary_log.php).
• compare_status_files.pl added to compare output of 2 SHOW GLOBAL STATUS.

For subscriptions of commercial use of MyEnv please get in contact with us.

Taxonomy upgrade extras: MyEnvoperationMySQL Operationsmulti instanceconsolidationtestingrelease

FromDual has the pleasure to announce the release of the new version 1.2.0 of its popular MySQL, Galera Cluster, MariaDB and Percona Server multi-instance environment MyEnv.

The new MyEnv can be downloaded here.

In the inconceivable case that you find a bug in the MyEnv please report it to our bug tracker.

Any feedback, statements and testimonials are welcome as well! Please send them to feedback@fromdual.com.

Upgrade from 1.1.x to 1.2.0 # cd ${HOME}/product # tar xf /download/myenv-1.2.0.tar.gz # rm -f myenv # ln -s myenv-1.2.0 myenv

If you are using plug-ins for showMyEnvStatus create all the links in the new directory structure:

cd ${HOME}/product/myenv ln -s ../../utl/oem_agent.php plg/showMyEnvStatus/
Changes in MyEnv 1.2.0 MyEnv

• Some minor fixes on init script.
• Introduction of states production, quality, testing and development.
• Colored prompt added for stage production databases.
• All /tmp/*sock moved to /var/run/mysqld.
• up output prepared for bind-address awareness.
• lsb_release dummy implemented.

MyEnv Installer

• Advice for 2 sudo commands in row was wrong.
• Port conflict resolution more verbose.
• Init script replacement check added. Replace init script is distribution aware and auto executable.
• Installer made mode modular and prepared for automatization.
• Installer allows now to run as other user than mysql.
• Bugs in preparing myenv.conf fixed and instance name removed.
• Install routine made more distribution aware.

MyEnv Utilities

• Split partition (split_partition.php) improved.
• Fix of DROP PARTITION (drop_partition.php) was executed in wrong order (new before old).
• Alter Engine script rewritten into PHP (alter_engine.php).
• Alter Engine script handles ROW_FORMAT=FIXED problem correctly now.
• Alter Engine script handles too large Primary Key better.
• Alter Engine script recognizes tables with AUTO_INCREMENT column not at 1st position.
• Purge Binary Log rewritten into PHP (purge_binary_log.php).
• compare_status_files.pl added to compare output of 2 SHOW GLOBAL STATUS.

For subscriptions of commercial use of MyEnv please get in contact with us.

Taxonomy upgrade extras: myenvoperationMySQL Operationsmulti instanceconsolidationtestingupgraderelease

Taxonomy upgrade extras: myenvoperationMySQL Operationsmulti instanceconsolidationtestingupgrade

FromDual has the pleasure to announce the release of the new version 1.2.0 of its popular MySQL, Galera Cluster, MariaDB and Percona Server multi-instance environment MyEnv.

The new MyEnv can be downloaded here.

In the inconceivable case that you find a bug in the MyEnv please report it to our bug tracker.

Any feedback, statements and testimonials are welcome as well! Please send them to feedback@fromdual.com.

Upgrade from 1.1.x to 1.2.0 # cd ${HOME}/product # tar xf /download/myenv-1.2.0.tar.gz # rm -f myenv # ln -s myenv-1.2.0 myenv

If you are using plug-ins for showMyEnvStatus create all the links in the new directory structure:

cd ${HOME}/product/myenv ln -s ../../utl/oem_agent.php plg/showMyEnvStatus/
Changes in MyEnv 1.2.0 MyEnv

• Some minor fixes on init script.
• Introduction of states production, quality, testing and development.
• Colored prompt added for stage production databases.
• All /tmp/*sock moved to /var/run/mysqld.
• up output prepared for bind-address awareness.
• lsb_release dummy implemented.

MyEnv Installer

• Advice for 2 sudo commands in row was wrong.
• Port conflict resolution more verbose.
• Init script replacement check added. Replace init script is distribution aware and auto executable.
• Installer made mode modular and prepared for automatization.
• Installer allows now to run as other user than mysql.
• Bugs in preparing myenv.conf fixed and instance name removed.
• Install routine made more distribution aware.

MyEnv Utilities

• Split partition (split_partition.php) improved.
• Fix of DROP PARTITION (drop_partition.php) was executed in wrong order (new before old).
• Alter Engine script rewritten into PHP (alter_engine.php).
• Alter Engine script handles ROW_FORMAT=FIXED problem correctly now.
• Alter Engine script handles too large Primary Key better.
• Alter Engine script recognizes tables with AUTO_INCREMENT column not at 1st position.
• Purge Binary Log rewritten into PHP (purge_binary_log.php).
• compare_status_files.pl added to compare output of 2 SHOW GLOBAL STATUS.

For subscriptions of commercial use of MyEnv please get in contact with us.

Taxonomy upgrade extras: logginggaleraclusterconflictdeadlockerror logerror

We typically suggest our customers to use our MySQL/Galera Cluster my.cnf configuration template to avoid MySQL configuration and performance problems.

And we are paranoid as well. Thus we enable all useful logging:

wsrep_log_conflicts = 1

But this has also some consequences of more visibility...

If you monitor carefully your Galera Cluster for example with the FromDual Performance Monitor for MySQL and MariaDB, you might probably see some strange values increasing from time to time:

mysql< SHOW GLOBAL STATUS LIKE 'wsrep_local_%r_s'; +---------------------------+-------+ | Variable_name | Value | +---------------------------+-------+ | wsrep_local_cert_failures | 42 | | wsrep_local_bf_aborts | 13 | +---------------------------+-------+

Those values are indicators that some transactions (Galera write sets) did to not succeed and were aborted by Galera. In this case the paranoid logging helps to find, what exactly was aborted and possibly helps to find out, if this can or should be fixed:

150410 1:44:18 [Note] WSREP: cluster conflict due to certification failure for threads: 150410 1:44:18 [Note] WSREP: Victim thread: THD: 151856, mode: local, state: executing, conflict: cert failure, seqno: 30399304 SQL: UPDATE login SET lTsexpire = UNIX_TIMESTAMP(NOW()) + lTimeout WHERE lSessionId = 'va3ta7besku82k56ncv3bnhlj5' *** Priority TRANSACTION: TRANSACTION 464359568, ACTIVE 0 sec starting index read mysql tables in use 1, locked 1 1 lock struct(s), heap size 360, 0 row lock(s) MySQL thread id 4, OS thread handle 0x7f1c0916c700, query id 8190690 Update_rows_log_event::find_row(30399302) *** Victim TRANSACTION: TRANSACTION 464359562, ACTIVE 0 sec mysql tables in use 1, locked 1 2 lock struct(s), heap size 360, 1 row lock(s), undo log entries 1 MySQL thread id 151856, OS thread handle 0x7f1c09091700, query id 8190614 172.20.100.11 sam_angiz query end UPDATE login SET lTsexpire = UNIX_TIMESTAMP(now()) + lTimeout WHERE lSessionId = 'va3ta7besku82k56ncv3bnhlj5' *** WAITING FOR THIS LOCK TO BE GRANTED: RECORD LOCKS space id 835205 page no 3 n bits 72 index `PRIMARY` of table `fromdual`.`login` trx table locks 1 total table locks 2 trx id 464359562 lock_mode X locks rec but not gap lock hold time 0 wait time before grant 0 150410 1:44:18 [Note] WSREP: cluster conflict due to high priority abort for threads: 150410 1:44:18 [Note] WSREP: Winning thread: THD: 4, mode: applier, state: executing, conflict: no conflict, seqno: 30399302 SQL: (null) 150410 1:44:18 [Note] WSREP: Victim thread: THD: 151856, mode: local, state: committing, conflict: no conflict, seqno: -1 SQL: UPDATE login SET lTsexpire = UNIX_TIMESTAMP(now()) + lTimeout WHERE lSessionId = 'va3ta7besku82k56ncv3bnhlj5'

In the above Galera conflict 2 login transactions where running at the same time. They both come with the same Session ID and want to update the expiry timestamp. Now how to solve or fix this:

• First check, if this table has a Primary Key (tables without a PK causes full table scans which can last for long time, increasing the chance for conflicts).
• Second check, if there is a (UNIQUE?) index on lSessionId. A missing index leads to full table scans which increases the chance for conflicts.
• Third check WHY 2 logins from the same Session ID can arrive at the same time (within 1 second) on 2 different Galera nodes (Ajax requests, etc...). Try to avoid such situations.

Taxonomy upgrade extras: galeravmwaresnapshot

From time to time we see at Galera Cluster customer engagements the following, for me scary, warning in the MySQL error log:

[Warning] WSREP: last inactive check more than PT1.5S ago (PT7.06159S), skipping check

We mostly see this in VMware set-ups. Some further enquiry with the Galera developers did not give a satisfying answer:

This can be seen on bare metal as well - with poorly configured mysqld, O/S, or simply being overloaded. All it means is that this thread could not get CPU time for 7.1 seconds. You can imagine that access to resources in virtual machines is even harder (especially I/O) than on bare metal, so you will see this in virtual machines more often.

This is not a Galera specific issue (it just reports being stuck, other mysqld threads are equally stuck) so there is no configuration options for that. You simply must make sure that your system and mysqld are properly configured, that there is enough RAM (buffer pool not over provisioned), that there is swap, that there are proper I/O drivers installed on guest and so on.

Basically, Galera runs in virtual machines as well as well virtual machines approximates bare metal.

We were still suspecting that this is somehow VMware related. This week we had the chance to investigate... At 01:36 am node Galera2 lost connection to the Cluster and became NON-PRIMARY. This is basically a bad sign:

150401 1:36:15 [Warning] WSREP: last inactive check more than PT1.5S ago (PT5.08325S), skipping check 150401 1:36:15 [Note] WSREP: (09c6b2f2, 'tcp://0.0.0.0:4567') turning message relay requesting on, nonlive peers: tcp://192.168.42.2:4567 150401 1:36:16 [Note] WSREP: view(view_id(NON_PRIM,09c6b2f2,30) memb { 09c6b2f2,0 } joined { } left { } partitioned { ce6bf2e1,0 d1f9bee0,0 }) 150401 1:36:16 [Note] WSREP: view(view_id(NON_PRIM,09c6b2f2,31) memb { 09c6b2f2,0 } joined { } left { } partitioned { ce6bf2e1,0 d1f9bee0,0 }) 150401 1:36:16 [Note] WSREP: New COMPONENT: primary = no, bootstrap = no, my_idx = 0, memb_num = 1 150401 1:36:16 [Note] WSREP: Flow-control interval: [16, 16] 150401 1:36:16 [Note] WSREP: Received NON-PRIMARY. 150401 1:36:16 [Note] WSREP: Shifting SYNCED -> OPEN (TO: 26304132) 150401 1:36:16 [Note] WSREP: New COMPONENT: primary = no, bootstrap = no, my_idx = 0, memb_num = 1 150401 1:36:16 [Note] WSREP: Flow-control interval: [16, 16] 150401 1:36:16 [Note] WSREP: Received NON-PRIMARY. 150401 1:36:16 [Warning] WSREP: Send action {(nil), 328, TORDERED} returned -107 (Transport endpoint is not connected) 150401 1:36:16 [Note] WSREP: New cluster view: global state: dcca768c-b5ad-11e3-bbc0-fb576fb3c451:26304132, view# -1: non-Primary, number of nodes: 1, my index: 0, protocol version 3 150401 1:36:17 [Note] WSREP: (09c6b2f2, 'tcp://0.0.0.0:4567') reconnecting to d1f9bee0 (tcp://192.168.42.1:4567), attempt 0

I suspected, after some investigation with the FromDual Performance Monitor for MySQL and MariaDB, that the database backup (mysqldump) could be the reason. It was not. But the customer explained, that after the database backup they do a VMware snapshot.

And when we compared our problem with the backup log file:

2015/04/01 01:35:08 [3] backup.fromdual.com: Creating a snapshot of galera3 2015/04/01 01:35:16 [3] backup.fromdual.com: Created a snapshot of galera3 2015/04/01 01:35:23 [3] backup.fromdual.com: galera3: backup the changed blocks of disk 'Festplatte 1' using NBD transport 2015/04/01 01:36:10 [3] backup.fromdual.com: galera3: saving the Change Block Tracking's reference for disk 'Festplatte 1' 2015/04/01 01:36:10 [3] backup.fromdual.com: Removing Arkeia's snapshot of galera3

we can see that our problem pretty much started with the end of the WMware snapshot (01:36:10 + 5.08 = 1:36:15). By the way: For such kind of investigations it is always good to have a ntp daemon for time synchronization running. Otherwise problem investigation becomes much harder...

Some more and deeper investigation shows that we loose from time to time nodes during VMware snapshots (galera3). But they recover quickly because they can do an IST. In worst case we can loose 2 nodes and then the whole Galera Cluster has gone.

192.168.42.3 / node Galera3 2015-04-10 01:44:00 [3] backup.fromdual.com: Creating a snapshot of galera3 2015-04-10 01:44:08 [3] backup.fromdual.com: Created a snapshot of galera3 2015-04-10 01:44:15 [3] backup.fromdual.com: galera3: backup the changed blocks of disk 'Festplatte 1' using NBD transport 2015-04-10 01:45:39 [3] backup.fromdual.com: galera3: saving the Change Block Tracking's reference for disk 'Festplatte 1' 2015-04-10 01:45:39 [3] backup.fromdual.com: Removing Arkeia's snapshot of galera3
150410 1:44:07 [Note] WSREP: (158f71de, 'tcp://0.0.0.0:4567') turning message relay requesting on, nonlive peers: tcp://galera1:4567 tcp://galera2:4567 150410 1:44:07 [Warning] WSREP: last inactive check more than PT1.5S ago (PT7.06159S), skipping check 150410 1:44:08 [Note] WSREP: Received NON-PRIMARY. 150410 1:44:10 [Note] WSREP: Shifting OPEN -> PRIMARY (TO: 30399299) 150410 1:44:11 [Warning] WSREP: Gap in state sequence. Need state transfer. 150410 1:44:11 [Note] WSREP: Prepared IST receiver, listening at: tcp://galera3:4568 150410 1:44:11 [Note] WSREP: Member 0.0 (galera3) requested state transfer from '*any*'. Selected 2.0 (galera2)(SYNCED) as donor. 150410 1:44:11 [Note] WSREP: Shifting PRIMARY -> JOINER (TO: 30399309) 150410 1:44:11 [Note] WSREP: Requesting state transfer: success, donor: 2 150410 1:44:11 [Note] WSREP: 2.0 (galera2): State transfer to 0.0 (galera3) complete. 150410 1:44:11 [Note] WSREP: Member 2.0 (galera2) synced with group. 150410 1:44:11 [Note] WSREP: Receiving IST: 8 writesets, seqnos 30399291-30399299 150410 1:44:11 [Note] WSREP: IST received: dcca768c-b5ad-11e3-bbc0-fb576fb3c451:30399299 150410 1:44:11 [Note] WSREP: 0.0 (galera3): State transfer from 2.0 (galera2) complete. 150410 1:44:11 [Note] WSREP: Shifting JOINER -> JOINED (TO: 30399309) 150410 1:44:11 [Note] WSREP: Member 0.0 (galera3) synced with group. 150410 1:44:11 [Note] WSREP: Shifting JOINED -> SYNCED (TO: 30399309) 150410 1:44:11 [Note] WSREP: Synchronized with group, ready for connections 150410 1:44:13 [Note] WSREP: (158f71de, 'tcp://0.0.0.0:4567') turning message relay requesting off 150410 1:45:42 [Warning] WSREP: last inactive check more than PT1.5S ago (PT2.47388S), skipping check 150410 1:45:43 [Note] WSREP: (158f71de, 'tcp://0.0.0.0:4567') turning message relay requesting on, nonlive peers: tcp://galera1:4567 tcp://galera2:4567 150410 1:45:44 [Note] WSREP: (158f71de, 'tcp://0.0.0.0:4567') reconnecting to 54de92f8 (tcp://galera1:4567), attempt 0 150410 1:45:44 [Note] WSREP: (158f71de, 'tcp://0.0.0.0:4567') reconnecting to c9d964d3 (tcp://galera2:4567), attempt 0 150410 1:45:48 [Note] WSREP: (158f71de, 'tcp://0.0.0.0:4567') turning message relay requesting off 150410 1:47:26 [Note] WSREP: (158f71de, 'tcp://0.0.0.0:4567') turning message relay requesting on, nonlive peers: tcp://galera1:4567 150410 1:47:27 [Note] WSREP: (158f71de, 'tcp://0.0.0.0:4567') reconnecting to 54de92f8 (tcp://galera1:4567), attempt 0 150410 1:47:31 [Note] WSREP: (158f71de, 'tcp://0.0.0.0:4567') turning message relay requesting off
192.168.42.1 / node Galera1 2015-04-10 01:47:24 [3] backup.fromdual.com: Creating a snapshot of galera1 2015-04-10 01:47:29 [3] backup.fromdual.com: Created a snapshot of galera1 2015-04-10 01:47:40 [3] backup.fromdual.com: galera1: backup the changed blocks of disk 'Festplatte 1' using NBD transport 2015-04-10 01:48:43 [3] backup.fromdual.com: galera1: saving the Change Block Tracking's reference for disk 'Festplatte 1' 2015-04-10 01:48:44 [3] backup.fromdual.com: Removing Arkeia's snapshot of galera1 150410 1:44:02 [Note] WSREP: (54de92f8, 'tcp://0.0.0.0:4567') turning message relay requesting on, nonlive peers: tcp://galera3:4567 150410 1:44:04 [Note] WSREP: (54de92f8, 'tcp://0.0.0.0:4567') reconnecting to 158f71de (tcp://galera3:4567), attempt 0 150410 1:44:12 [Note] WSREP: Member 0.0 (galera3) requested state transfer from '*any*'. Selected 2.0 (galera2)(SYNCED) as donor. 150410 1:45:43 [Note] WSREP: (54de92f8, 'tcp://0.0.0.0:4567') turning message relay requesting on, nonlive peers: tcp://galera3:4567 150410 1:45:44 [Note] WSREP: (54de92f8, 'tcp://0.0.0.0:4567') reconnecting to 158f71de (tcp://galera3:4567), attempt 0 150410 1:45:48 [Note] WSREP: (54de92f8, 'tcp://0.0.0.0:4567') turning message relay requesting off 150410 1:47:27 [Warning] WSREP: last inactive check more than PT1.5S ago (PT3.66452S), skipping check 150410 1:47:27 [Note] WSREP: (54de92f8, 'tcp://0.0.0.0:4567') turning message relay requesting on, nonlive peers: tcp://galera3:4567 150410 1:47:30 [Note] WSREP: (54de92f8, 'tcp://0.0.0.0:4567') turning message relay requesting off
192.168.42.2 / node Galera2 2015-04-10 02:09:55 [3] backup.fromdual.com: Creating a snapshot of galera2 2015-04-10 02:09:58 [3] backup.fromdual.com: Created a snapshot of galera2 2015-04-10 02:10:05 [3] backup.fromdual.com: galera2: backup the changed blocks of disk 'Festplatte 1' using NBD transport 2015-04-10 02:10:53 [3] backup.fromdual.com: galera2: saving the Change Block Tracking's reference for disk 'Festplatte 1' 2015-04-10 02:10:54 [3] backup.fromdual.com: Removing Arkeia's snapshot of galera2
150410 1:44:02 [Note] WSREP: (c9d964d3, 'tcp://0.0.0.0:4567') turning message relay requesting on, nonlive peers: tcp://galera3:4567 150410 1:44:03 [Note] WSREP: (c9d964d3, 'tcp://0.0.0.0:4567') reconnecting to 158f71de (tcp://galera3:4567), attempt 0 150410 1:44:08 [Warning] WSREP: discarding established (time wait) 158f71de (tcp://192.168.42.3:4567) 150410 1:44:11 [Note] WSREP: Member 0.0 (galera3) requested state transfer from '*any*'. Selected 2.0 (galera2)(SYNCED) as donor. 150410 1:44:13 [Note] WSREP: (c9d964d3, 'tcp://0.0.0.0:4567') turning message relay requesting off 150410 1:45:43 [Note] WSREP: (c9d964d3, 'tcp://0.0.0.0:4567') turning message relay requesting on, nonlive peers: tcp://galera3:4567 150410 1:45:44 [Note] WSREP: (c9d964d3, 'tcp://0.0.0.0:4567') reconnecting to 158f71de (tcp://galera3:4567), attempt 0 150410 1:45:48 [Note] WSREP: (c9d964d3, 'tcp://0.0.0.0:4567') turning message relay requesting off 150410 1:47:26 [Note] WSREP: (c9d964d3, 'tcp://0.0.0.0:4567') turning message relay requesting on, nonlive peers: tcp://galera1:4567 150410 1:47:27 [Note] WSREP: (c9d964d3, 'tcp://0.0.0.0:4567') reconnecting to 54de92f8 (tcp://galera1:4567), attempt 0 150410 1:47:30 [Note] WSREP: (c9d964d3, 'tcp://0.0.0.0:4567') turning message relay requesting off 150410 2:09:57 [Warning] WSREP: last inactive check more than PT1.5S ago (PT1.83618S), skipping check

The backups are done with the 2 options:

• Change Block Tracking (CBT) (Arkeia, VMware) and
• Quiesce Guest File System (Arkeia, VMware)

enabled.

Possibly this is the reason and one should disable those features in combination with Galera. Further investigation is going on. In worst case VMware snapshotting with Galera should be avoided.

Im April und Mai 2015 bieten wir wieder viele interessante und spannende Kurse rund um MySQL an.

Falls Sie Interesse haben, an diesen Schulungen teilzunehmen, sollten Sie Sich schnell anmelden, um Sich Ihren Platz zu sichern. Es sind nur noch wenige Plätze vorhanden.

Folgende Kurse zum Thema MySQL und Galera Cluster finden im April und Mai statt:

MySQL für Profis vom 20. - 24. April 2015 in der Heinlein Akademie in Berlin. Hier anmelden.

Galera Cluster für MySQL vom 05. - 06. Mai 2015 im LinuxHotel in Essen. Hier anmelden.

MySQL für Fortgeschrittene vom 18. - 22. Mai 2015 im LinuxHotel in Essen. Hier anmelden.

Bitte vermerken Sie unter Anmerkungen, dass Sie über den FromDual Newsletter auf das Angebot aufmerksam gemacht wurden.

Alle übrigen Schulungstermine finden Sie unter MySQL/MariaDB Schulung.

Taxonomy upgrade extras: mysqlmariadbgaleraschulungtraining

Im April und Mai 2015 bieten wir wieder viele interessante und spannende Kurse rund um MySQL an.

Falls Sie Interesse haben, an diesen Schulungen teilzunehmen, sollten Sie Sich schnell anmelden, um Sich Ihren Platz zu sichern. Es sind nur noch wenige Plätze vorhanden.

Folgende Kurse zum Thema MySQL und Galera Cluster finden im April und Mai statt:

MySQL für Profis vom 20. - 24. April 2015 in der Heinlein Akademie in Berlin. Hier anmelden.

Galera Cluster für MySQL vom 05. - 06. Mai 2015 im LinuxHotel in Essen. Hier anmelden.

MySQL für Fortgeschrittene vom 18. - 22. Mai 2015 im LinuxHotel in Essen. Hier anmelden.

Bitte vermerken Sie unter Anmerkungen, dass Sie über den FromDual Newsletter auf das Angebot aufmerksam gemacht wurden.

Alle übrigen Schulungstermine finden Sie unter MySQL/MariaDB Schulung.

Taxonomy upgrade extras: mysqlmariadbgaleraschulungtraining

Taxonomy upgrade extras: mysqlmariadbgaleraschulungtraining

Im April und Mai 2015 bieten wir wieder viele interessante und spannende Kurse rund um MySQL an.

Falls Sie Interesse haben, an diesen Schulungen teilzunehmen, sollten Sie Sich schnell anmelden, um Sich Ihren Platz zu sichern. Es sind nur noch wenige Plätze vorhanden.

Folgende Kurse zum Thema MySQL und Galera Cluster finden im April und Mai statt:

MySQL für Profis vom 20. - 24. April 2015 in der Heinlein Akademie in Berlin. Hier anmelden.

Galera Cluster für MySQL vom 05. - 06. Mai 2015 im LinuxHotel in Essen. Hier anmelden.

MySQL für Fortgeschrittene vom 18. - 22. Mai 2015 im LinuxHotel in Essen. Hier anmelden.

Bitte vermerken Sie unter Anmerkungen, dass Sie über den FromDual Newsletter auf das Angebot aufmerksam gemacht wurden.

Alle übrigen Schulungstermine finden Sie unter MySQL/MariaDB Schulung.

Call for Papers für IT-Tage mit dem Schwerpunkt Datenbanken vom 14. bis 18. Dezember 2015 in Frankfurt ist eröffnet.

Die Organisatoren würden sich über zahlreiche Vortrags-Einreichungen freuen...

Die IT-Tage mit dem Schwerpunkt Datenbanken finden im Rahmen der Reihe "Informatik Aktuell – Wissen kompakt" zentral in Frankfurt am Main / Messe statt.

Call for Papers für IT-Tage mit dem Schwerpunkt Datenbanken vom 14. bis 18. Dezember 2015 in Frankfurt ist eröffnet.

Die Organisatoren würden sich über zahlreiche Vortrags-Einreichungen freuen...

Die IT-Tage mit dem Schwerpunkt Datenbanken finden im Rahmen der Reihe "Informatik Aktuell – Wissen kompakt" zentral in Frankfurt am Main / Messe statt.

Call for Papers für IT-Tage mit dem Schwerpunkt Datenbanken vom 14. bis 18. Dezember 2015 in Frankfurt ist eröffnet.

Die Organisatoren würden sich über zahlreiche Vortrags-Einreichungen freuen...

Die IT-Tage mit dem Schwerpunkt Datenbanken finden im Rahmen der Reihe "Informatik Aktuell – Wissen kompakt" zentral in Frankfurt am Main / Messe statt.

Unsere Präsentation von der CeBit 2015: MySQL Performance Tuning für Entwickler kann jetzt heruntergeladen werden.

Inhalt: Datenbank Performance, Profiling, General Query Log, des Admins Bazooka, Slow Query Log, Query Analyzer, Query Execution Plan, EXPLAIN, Indexieren, ...

Taxonomy upgrade extras: general query logPerformance Tuningentwickler

Unsere Präsentation von der CeBit 2015: MySQL Performance Tuning für Entwickler kann jetzt heruntergeladen werden.

Inhalt: Datenbank Performance, Profiling, General Query Log, des Admins Bazooka, Slow Query Log, Query Analyzer, Query Execution Plan, EXPLAIN, Indexieren, ...

Unsere Präsentation von der CeBit 2015: MySQL Performance Tuning für Entwickler kann jetzt heruntergeladen werden.

Inhalt: Datenbank Performance, Profiling, General Query Log, des Admins Bazooka, Slow Query Log, Query Analyzer, Query Execution Plan, EXPLAIN, Indexieren, ...

Taxonomy upgrade extras: partitionrenameDDL

Before I forget it and have to search again here a short note about how to rename a MySQL Partition:

My dream:

ALTER TABLE history RENAME PARTITION p2015_kw10 INTO p2015_kw09;
In reality: ALTER TABLE history REORGANIZE PARTITION p2015_kw10 INTO ( PARTITION p2015_kw09 VALUES LESS THAN (UNIX_TIMESTAMP('2015-03-02 00:00:00')) );

Caution: REORGANIZE PARTITION causes a full copy of the whole partition!

Hint: I assume it would be very easy for MySQL or MariaDB to make this DDL command an in-place operation...

MySQL Partitioning was introduced in MySQL 5.1.

FromDual is pleased to announce the release of a new version 1.0.0 of the Nagios and Icinga plug-ins for MySQL, MariaDB, Percona Server and Galera Cluster.

Any information about the changes and the new functions of the Nagios and Icinga plug-ins you can find here.

If you have any problems with the new version you can reach us by e-mail at: contact@fromdual.com or by phone on +41 44 500 58 20.

Your FromDual Team

Taxonomy upgrade extras: nagiosicingaplug-inmysqlmariadbpercona serverGalera Clusterrelease