You are here

mysql

Advanced MySQL DBA Workshop

With a partner we are planning and Advanced MySQL DBA workshop. As the name says it should be a workshop. Its planned duration is 2 days. So within 2 days we can cover 4 to 8 topics more deeply. Requirements: VirtualBox, VMware, own Laptop?

Possible exercises during the workshop

  • Set-up a Master-Master replication with 2 Slaves
  • Load balance on master with MySQL Proxy and on Slaves with LVS.
Undefined

How good is MySQL INSERT TRIGGER performance

Abstract: In this article we discuss how big is the performance impact of MySQL TRIGGERs compared to application side logging (with INSERT) into a MySQL table.

MySQL out in the wild

One of our partners recently asked me on what platforms do we usually see MySQL installed out there...

The last 5 years I gave the answer: Typically it is 80% Linux, 10% Windows, 5% Solaris and 5% all others. But this was only the picture of my limited view and I was not sure how objective this was.

This time I really wanted to know it and so I collected the information of about 570 MySQL installations of customers.

The following numbers came out:

German speaking MySQL User Group (DMySQLAG) founded today

Taxonomy upgrade extras: 
Today the German speaking MySQL User Group (DMySQLAG) was officially founded in Berlin. The association advocates:
  • the information of the use, the handling and the experience with MySQL and development in the MySQL Eco-System as well as systems which use MySQL.
  • the exchange of experience between MySQL users about MySQL and other systems.
  • the Advice and Cooperation with Oracle and vendors of other systems.
  • the submission of suggestions of the members to Oracle and vendors of other systems.

Deutschsprachige MySQL Anwender Gruppe gegründet (DMySQLAG)

Taxonomy upgrade extras: 
Heute wurde in Berlin die Deutschsprachige MySQL Anwender Gruppe formal gegründet. Der Verein fördert:
  • die Information über den Einsatz, den Umgang und die Erfahrung mit MySQL und Entwicklungen im MySQL Eco-System sowie Anwendungssysteme welche MySQL nutzen.
  • den Erfahrungsaustausch zwischen den Benutzern über MySQL sowie anderer Systeme.
  • die Beratung und Zusammenarbeit mit Oracle und Herstellern anderer Systeme.
  • die Unterbreitung von Mitgliedervorschlägen an Oracle und Hersteller von anderen Systemen.

When a MySQL table was last touched

In our last customer project we had around 600 Gbyte of data in a MySQL database. Because this database consumed a significant amount of our disk space and backups with the InnoDB backup tool took pretty long we wanted to find out if we could get rid of some of the tables.

This application was growing over the last 10 years and it was not clear if some tables are still in use or not.

But how to find out when a table was touched last? MySQL/InnoDB theoretically could know about but does not report this information.

BLOB's aus der MySQL Datenbank herausklauben

Taxonomy upgrade extras: 

Ein Kunde, welcher mit digitalen Zertifikaten zu tun hat, hatte ein Problem mit einem solchen. Also mussten wir nachforschen, was das Problem war.

Weil das Zertifikat in binärer Form vorliegt, ist es in einem BLOB gespeichert und wir mussten es aus der Datenbank herausklauben um einige Tests damit durchzuführen.

Als erstes kam mir in den Sinn, das Zertifikat mit dem Befehl SELECT INTO OUTFILE zu erhalten. Aber das Verifizierungstool reklamierte und sagte uns, dass das Zertifikat ein falsches Format habe.

Dumping BLOB's from the MySQL database

Taxonomy upgrade extras: 

A customer who is handling digital certificates had a problem with one of those. So we had to investigate.

Because the certificate is in binary form it is stored in a BLOB and we had to extract it from the database to do some verifications.

What first came to my mind was to extract the certificate with the SELECT INTO OUTFILE command. But the verification tool complained and told us that the certificate has a wrong format.

PrimeBase Technologies and FromDual form a Service-Cooperation for MySQL products

From the Cooperation of these two companies arises the biggest independent service provider for MySQL and MariaDB in Europe.

Hamburg, Uster -- February 28, 2011 - The Hamburg based PrimeBase Technologies and the near Zürich located FromDual are forming a Cooperation for MySQL products and services, starting March 1st, 2011.

This Cooperation enables both companies to offer a complete set of services for all MySQL and MariaDB customers.

The customers of both parties now have he possibility to demand a 24x7 support service from their provider.

DOAG Reagionaltreffen in München - 23. März 2011

Wir sind am DOAG Regionaltreffen in München am Mittwoch den 23. März mit unserem Vortrag MySQL Replikation - Scale-Out, Master-Master, Backup (der Vortrag wird in deutscher Sprache gehalten).

doag_left_r64.gif

FromDual releases new version of its MySQL Performance Monitor

FromDual releases its new version v0.5 of its MySQL Performance Monitor working with Zabbix.

What has changed so far in this release:

FromDual partner

FromDual Partner

FromDual cooperates with the following companies:

Undefined

MySQL Client Error Codes and Messages 2050 - 2099

2000 - 2049
  • Error: 2050 (CR_FETCH_CANCELED)

    Message: Row retrieval was canceled by mysql_stmt_close() call

  • Error: 2051 (CR_NO_DATA)

    Message: Attempt to read column without prior row fetch

Undefined

MySQL Server Error Codes and Messages 1700 - 1749

1650 - 1699 2000 - 2049
  • Error: 1700 SQLSTATE: HY000 (ER_GRANT_PLUGIN_USER_EXISTS)

    Message: GRANT with IDENTIFIED WITH is illegal because the user %-.*s already exists

Undefined

MySQL Server Error Codes and Messages 1650 - 1699

1600 - 1649 1700 - 1749
  • Error: 1650 SQLSTATE: HY000 (ER_SLAVE_IGNORE_SERVER_IDS)

    Message: The requested server id %d clashes with the slave startup option --replicate-same-server-id

Undefined

MySQL Server Error Codes and Messages 1600 - 1649

1550 - 1599 1650 - 1699
Undefined

MySQL Server Error Codes and Messages 1550 - 1599

1500 - 1549 1600 - 1649
Undefined

MySQL Server Error Codes and Messages 1500 - 1549

1450 - 1499 1550 - 1599
  • Error: 1500 SQLSTATE: HY000 (ER_SUBPARTITION_ERROR)

    Message: It is only possible to mix RANGE/LIST partitioning with HASH/KEY partitioning for subpartitioning

Undefined

MySQL Server Error Codes and Messages 1450 - 1499

1400 - 1449 1500 - 1549
Undefined

MySQL Server Error Codes and Messages 1400 - 1449

1350 - 1399 1450 - 1499
  • Error: 1400 SQLSTATE: XAE09 (ER_XAER_OUTSIDE)

    Message: XAER_OUTSIDE: Some work is done outside global transaction

  • Error: 1401 SQLSTATE: XAE03 (ER_XAER_RMERR)

Undefined

MySQL Server Error Codes and Messages 1250 - 1299

1200 - 1249 1300 - 1349
Undefined

MySQL Server Error Codes and Messages 1200 - 1249

1150 - 1199 1250 - 1299

  • Error: 1200 SQLSTATE: HY000 (ER_BAD_SLAVE)
    Message: The server is not configured as slave; fix in config file or with CHANGE MASTER TO

    How does the MySQL error message look like?

Undefined

Pages

Subscribe to RSS - mysql