…, but also for internal XA coordination between the InnoDB transaction logs and the MySQL binary logs, to ensure that they are consistent. Consistent is… instance — it doesn’t clear things up very well: When the variable is enabled (the default), InnoDB support for two-phase commit…
Post: Logging Foreign Key errors
September 27, 2012 By Leave a Comment
…clear where is the error. Let’s see the explanation with perror: # perror 150 MySQL…’s check what the tool has logged: mysql> select * from test.foreign_key_errors\G *************************** 1…mysql.com/doc/refman/5.5/en/innodb-foreign-key-constraints.html for correct foreign key definition. InnoDB…
Post: Modeling MySQL Capacity by Measuring Resource Consumptions
March 8, 2011 By 1 Comment
… out Thinking Clearly About Performance by Cary Millsap. So how we can use this data to estimate capacity of MySQL system ? We… estimates. If we’re running Innodb with MySQL we can use Innodb_data_reads , Innodb_data_writes, Innodb_os_log_fsyncs for your disk IO estimation… ? You can take a look at procfs for MySQL process: root@ubuntu:/var/log/mysql# cat /proc/19018/stat 19018 (mysqld) S 1…
Post: Troubleshooting MySQL Memory Usage
March 21, 2012 By 5 Comments
…MySQL is troubleshooting memory usage. The problem usually starts like this – you have configured MySQL to use reasonable global buffers, such as innodb…MySQL because there are no clear…
Post: Beware the Innodb Table Monitor
November 29, 2011 By 2 Comments
… mysqld.err log to verify if the problem still existed. The Innodb Table Monitor has existed for basically forever in Innodb (the MySQL manual… the Data dictionary to the mysql error log, which looks something like this: =========================================== 090420 12:09:32 INNODB TABLE MONITOR OUTPUT =========================================== ————————————– TABLE: name… be any adverse effects from running the monitor, but something clearly was a lot busier than expected during execution. He had…
Post: High-Performance Click Analysis with MySQL
December 22, 2008 By 13 Comments
…next point: Use InnoDB Assuming that you will use the stock MySQL server, InnoDB is usually your … your data is coming from some Apache log or similar source. Write a …clearly better for some workloads out-of-the-box than MySQL is, especially for more complex queries. Percona is not tied to MySQL…
Post: Add an option to Fail on Innodb Initialize failure, Please ?
October 11, 2007 By 9 Comments
… system will not complete boot up without having these systems clearly mounted. The reason is same – you do not want to… worse. Innodb failed initialization is not only very hidden – you will not see it unless you look in MySQL server Error Logs but the error message accessing Innodb tables is also very obfuscated: error…
Post: How to recover deleted rows from an InnoDB Tablespace
February 20, 2012 By 4 Comments
… InnoDB Tablespace Monitor. This monitor will write all the information related with tables and indexes (with their IDs) to the error log. mysql (employees) > CREATE TABLE innodb_table_monitor (id int) ENGINE=InnoDB; TABLE: name employees/salaries, id 18… which index is the data so the next step is clear, extract the rows from it. To accomplish this task we…
Post: 7 Reasons why MySQL Quality will never be the same
December 10, 2008 By 15 Comments
… MySQL Development is done by different team working on the different components, while MySQL was not designed to be very modular with clear… new Innodb Development is going with Innodb Plugin which is separate from Innodb included default MySQL. Why is not this part of stock MySQL 5… than standard MySQL. Another problem for Innodb Plugin quality is lack of the full disclosure about bugs. Check this change log for example…
Post: InnoDB benchmarks
January 3, 2007 By 15 Comments
…/mysql- –with-innodb and next startup options were used: libexec/mysqld –no-defaults –user=root –innodb-buffer-pool-size=1500M –innodb-log-file-size=100M –innodb… 16GB of RAM Disks do no matter, as I ran clear CPU-bound benchmarks. The raw results of benchmarks are available… or on our page http://www.mysqlperformanceblog.com/files/benchmarks/innodb_scale.html (Note: This benchmark is synthetic micro benchmarks focusing…
