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Hi Stephane,

In fact at dbi services we have professional material ;-)

Samsung SSD 840 PRO Series

Gregory Steulet

I have a write throughput 10x lower than your test (is it the SSD?)

stephane (ebu)
You obtained :Running the test with following options: Number of threads: 64 Random number generator...
stephane (ebu)

I wrote a benchmark based on your own. I'm so far from your result (which is very good for a laptop)

stephane (ebu)
Hi Stephane,It depends, you can find the stats for MySQL 5.6 below:sysbench 0.5: multi-threaded sys...
Gregory Steulet
Blog Gregory Steulet Mysqldump issue - SELECT command denied to user

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Mysqldump issue - SELECT command denied to user

During one of my last MySQL mission, I encountered a "security error" with mysqldump. The mission was about migrating a MySQL database from one box to another MySQL version and from Windows to Linux with different users. In order to do that, I used mysqldump. During the import of the data, I got the following warning:


ERROR 1449 (HY000) at line 1860: The user specified as a definer ('cdadmin'@'%') does not exist


Following the migration, I did the backup strategy. During the first mysql dump, I got the following error message:


mysql@mysql001: [mysqld2] mysqldump test
Running mysqldump for instance mysqld2 to /u99/mysqlbackup/mysqld2/dump/2012-11-14_15-48-23, please wait...
MySQL dump of instance mysqld2 to /u99/mysqlbackup/mysqld2/dump/2012-11-14_15-48-23 has failed.
mysqldump: Couldn't execute 'show table status like 'cdr\_app\_browser\_v'': SELECT command denied to user ''@'%' for column 'APPLICATION' in table 'cd_app_browser' (1143)


Msqldump exited without finishing to dump the mysql database. Obvisously, both errors had the same root issue.

My initial dump file contained a DEFINER clause and this was the reason of these error messages. As specified in the MySQL documentation, the DEFINER clause specifies the MySQL account to be used when checking access privileges at routine execution time for routines that have the SQL SECURITY DEFINERcharacteristics. When you dump the data structure for views, triggers, and stored routines, you also dump the permissions related to such objects, with the DEFINER clause.

The MySQL Bug 50594 ( is closely related to this issue. In order to remove the DEFINER clause from the dump file - which can be time consuming - some tools such as MySQL dump filter may help you. For more information regarding this tool, please have a look at this blog posting:

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Grégory Steulet  is Chief Financial Officer (CFO) and Region Manager at dbi services. He has more than ten years of experience in database and infrastructure management, engineering, and optimization. He is specialized in Oracle technologies and high availability solutions (Oracle DataGuard, Data Replication Block Device). His expertise also includes Avaloq banking applications, as well as the open source field (MySQL, Unix/Linux, etc.). Grégory Steulet is "Oracle Certified Professional 10g", "MySQL Cluster 5.1 Certified", and "Avaloq Certified Professional 2.6". Prior to joining dbi services, Grégory Steulet was Senior Consultant at Trivadis in Lausanne. He also worked as IT Administrator at Box Telecom in Miami Beach, Florida (USA). Grégory Steulet has an Executive MBA from the International Institute of Management in Technology, Fribourg (CH). He also holds a Bachelor's Degree in Business Administration and Computer Science from the University of Applied Sciences Western Switzerland. His branch-related experience covers Telecommunications, Financial Services / Banking, Logistics, Pharma etc.


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