Databases
Migrating MySQL latin1 to utf8 – The process
Having covered the preparation and character set options of performing a latin1 to utf8 MySQL migration, just how do you perform the migration correctly. Example Case Just to recap, we have the following example table and data.
Read moreDon’t Assume – Data Integrity
MySQL has the same level of data integrity for numbers and strings as Oracle; when MySQL is correctly configured. By default (a reason I wish I knew why it is still the default), MySQL performs silent conversions on boundary conditions of data that will result in your data not always being what is specified.
Read moreHow to crash mysqld intentionally
While some may think I’m daft, I have a legitimate reason for wanting to crash mysqld. However first we need to find a way to crash it. Great thanks to Alan K, Mark L, Harrison and Hartmut on #mysql-dev for several suggestions and a config option I was unaware of.
Read moreDon’t Assume – Transactions
MySQL by default is a NON transactional database. For the hobbyist (See The Hobbyist and the Professional ), startup entrepreneur and website developer this may not appear foreign, however to the seasoned Oracle DBA who has only used Oracle the concept is very foreign.
Read moreUpcoming book – Expert PHP and MySQL
This month will see the release of the book Expert PHP and MySQL which I was a co-author of. Initially this will be available for purchase in PDF format from the Wrox website and I am hopeful this will be available in print format for the MySQL Users Conference .
Read moreDon’t Assume – Common Terminology
In Oracle the default transaction isolation is READ_COMMITTED. In MySQL the default is REPEATABLE_READ. Because MySQL also has READ_COMMITTED I have seen in more then one production MySQL environment a transaction isolation of READ_COMMITTED.
Read moreDon’t Assume – Session Scope
MySQL system variables and status variables have two scopes. These are GLOBAL and SESSION which are self explanatory. This is important to realize when altering system variables dynamically. The following example does not produce the expected results.
Read moreDon’t Assume Series – MySQL for the Oracle DBA
As part of my MySQLCamp for the Oracle DBA series of talks to help the Oracle DBA understand, use and appreciate MySQL I have also developed a series of short interesting posts I have termed “Don’t Assume”.
Read moreEdward Screven of Oracle to Answer Questions for future of MySQL
For those of you on the O’Reilly MySQL conference list you will no doubt see this email, but for readers here is the important bits. _ Oracle Executive Will Speak at O’Reilly MySQL Conference & Expo
Read moreIneffective concatenated indexes
In MySQL significant performance improvements can be achieved by the correct use of indexes. It is important to understand different MySQL index implementations and one key improvement on indexes defined on single columns is to use multiple column or more commonly known concatenated indexes.
Read moreGetting started with Cassandra
With the motivation from today’s public news on Twitter’s move from MySQL to Cassandra , my own skills desire following in-depth discussions at last November’s Open SQL Camp to consider Cassandra and yesterday’s discussion with a new client on persistent key-value store products, today I download installed and configured for the first time.
Read moreThe correct approach to rolling MySQL logs
I say correct because there are several incorrect approaches to managing MySQL logs. In MySQL you have two important log files, the MySQL error log (configured with –log-error ) and the MySQL slow query log (configured with –log-slow-queries or –slow-query-log and –slow-query-log-file which is available from 5.
Read moreWhat’s your MySQL version?
I’ve heard that the mechanic’s wife always has a car that needs repair or tuneup, the painter’s wife always had walls of peeling paint, you get the picture. What about MySQL DBA’s and their own databases?
Read moreMigrating MySQL latin1 to utf8 – Character Set Options
Continuing on from preparation in our MySQL latin1 to utf8 migration let us first understand where MySQL uses character sets. MySQL defines the character set at 4 different levels for the structure of data.
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