This week we start talking about the Python MySQL Utilities. Ear Candy is a pitfall when importing a mysqldump export and At the Movies is "Deploying MySQL in AWS and OpenStack" by Mark Riddoch of SkySQL.

Part 2 of MySQL Utilities
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Part 4 of MySQL Utilities
Part 5 of MySQL Utilities

MySQL Utilities
MySQL Utilities documentation

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Oracle Linux had a lot of engineering hours inside it to drive the performance to new levels. But currently oracle Linux 6.4 comes with a dated version of MySQL, version 5.1.69. So how can you upgrade to 5.6 without losing your data?

First, make a backup just in case Murphy’s Law has a tort waiting for you.

Remove the old files. The rpm -qa | grep -i ^mysql command will show you the packages to be removed. Then rpm -e mysql-server-5.1.69-1.el6_4.x85_64 mysql-libs-5.1.69-1.el6_4.x86_64 and mysql-5.1.69-1.el6_4.x85_64 to remove them.

Thirdly, download the big MySQL 5.6 bundle for Oracle Linux. Untar the bundle and then a quick rpm -Uhv MySQL-*.rpm will install the files.

There is ONE big difference. MySQL as of 5.6, forces a default for the MySQL server and places it in /root/.mysql_secret and you will see to set a new password upon …

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Desde a versão 5.6.6 MySQL introduziu o habilidade the forcar usuários a trocar suas senhas.
Tu pode fazer isso digitando ALTER USER PASSWORD EXPIRE.

ALTER USER 'marcelo'@'localhost' PASSWORD EXPIRE;

Na próxima vez que marcelo tentar conectar ao MySQL via localhost, o servidor ira bloquear todos os comandos até que o usuario use SET PASSWORD;

mysql> \s
ERROR 1820 (HY000): You must SET PASSWORD before executing this statement

Para alterar a senha, e utilizar o server normalmente, basta digitar:

SET PASSWORD = PASSWORD('senha');
#Ou utilizando o hash gerado por SELECT PASSWORD('senha');
SET PASSWORD = '*AD77F56D2FD78299B87609DCC0423260B5AADB03';

Mas tome cuidado, se tu marcar a senha de um usuário como expirada, ele não poderá conectar via clientes com versão anterior a 5.6.10:

ERROR 1862 (HY000): Your password has expired. To log in you must …

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Since version 5.6.6 MySQL has introduced the capability to force an user to change their password.
You can archive that by issue ALTER USER PASSWORD EXPIRE statement.

ALTER USER 'marcelo'@'localhost' PASSWORD EXPIRE;

Next time marcelo tries to login from localhost it will block all statements rather then SET PASSWORD;

mysql> \s
ERROR 1820 (HY000): You must SET PASSWORD before executing this statement

To remove this block, just issue an :

SET PASSWORD = PASSWORD('pwd');
#Or use the hash received from SELECT PASSWORD('pwd');
SET PASSWORD = '*975B2CD4FF9AE554FE8AD33168FBFC326D2021DD';

But be careful, if you expire the password for an account, you won’t be able to login with any client version before 5.6.10(GA):

ERROR 1862 (HY000): Your password has expired. To log in you must change it using a client that supports expired passwords.

As Peter …

This Log Buffer Edition starts with an awesome post by Dana Pylayeva from Rakuten LinkShare, a long term Pythian client, about her deep and insightful reflections about security. And as usual, it also brings together all the sparkling gems of Oracle, SQL Server, and MySQL. Enjoy!

Oracle:

Alberto illustrates the algorithm used by Oracle (in 11.2.0.3) to fast refresh a materialized view (MV) containing only the SUM aggregate function.

Tim Hall writes about Oracle 12c Multitenant Option : CDBs and PDBs. …

Help, the database is on fire. Well, it probably is but the solution may also be easy. Here are a few steps for the part-time MySQL DBA/sysadmin/developer. Total time to address this solution was 2 minutes, the inability to not go back to sleep, not priceless.

First, access to the DB server is possible, and also the mysql command line client. If you are getting “Too Many Connections” read Why GRANT ALL is bad.

Given the message “the database is on fire”, the likely cause is rogue SQL.

mysql> show global variables like 'max_connections';
+-----------------+-------+
| Variable_name   | Value |
+-----------------+-------+
| max_connections | 5000  |
+-----------------+-------+
1 row in set (0.02 sec)

mysql> show global status like 'threads%';
+-------------------+-------+
| Variable_name     | Value | …

If you have thread_concurrency, innodb_additional_mem_pool_size or innodb_use_sys_malloc in one of your my.cnf or my.ini files please remove it at your next opportunity unless one of the unlikely exceptions applies.

Thread_concurrency is a setting for only Solaris that has no effect in recent Solaris versions like 11. For Solaris 8 and earlier it gave the thread system a hint about how many threads to use for MySQL. Solaris 8 was last a supported platform for MySQL 5.1. We have deprecated this setting from 5.6.1 and removed it from 5.7.

…

The following simple INFORMATION_SCHEMA statement will identify and also verify tables that have no rows. These may be candidate tables to remove from your data model.

mysql --defaults-file=.my.cnf -N -e "select CONCAT('SELECT "',table_schema,'.',table_name,'" AS tbl, COUNT(*) AS cnt FROM ',table_schema,'.',table_name,';') as cmd from information_schema.tables where table_schema not in ('mysql','performance_schema','information_schema') and table_rows=0;" | mysql --defaults-file=.my.cnf -N

Sorry for this delay in providing part 2 of this series, but stuff happened that had really high priority, and in addition I was on vacation. But now I'm back in business!

So, last time I left you with some open thought on why Big Data can be useful, but that we also need new analysis tools as well as new ways of visualizing data for this to be truly useful. As for analysis, lets have a look at text, which should be simple enough, right? And sometimes it is simple. One useful analysis tool that is often overlooked is Google. Let's give it a shot, just for fun: if I think of two fierce competitors, somehow, that we can compare, say Oracle and MySQL.. Oracle is much older, both as a technology and as a company and in addition owns the MySQL brand these days. But on the other hand, the Web is where MySQL has it's sweet spot. Just Googling for MySQL and Oracle shows that MySQL seems to be much more discussed (and no, I haven't turned …

The MySQL Utilities Team is pleased to announce the latest GA release of
MySQL Utilities. This release marks a milestone of concentrated effort to
expand the use of utilities in more diverse installations through improved
robustness, error handling, and quality.

Many Improvements
There are number such enhancements in this release. In this post we will
highlight a few of the more significant improvements.

• (new utility) MySQL .frm Reader (mysqlfrm) - read .frm files and generate CREATE statements with or without a server connection.
• (revised) improved documentation including a section on example administrative tasks - see http://dev.mysql.com/doc/workbench/en/mysql-utilities.html
• MySQL Utilities is packaged for .msi, .rpl, .deb platforms and source .tar/.zip
…