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Figuring out what limits MySQL Replication

 | March 7, 2007 |  Posted In: Insight for DBAs

Today I was cloning the master using LVM Snapshot and found it was taking quite a while to catch up, which highlighted replication could be the limiting factor for this system quite soon, so I decided to check what is limiting MySQL Replication speed. My first idea was to check it based on slow query […]

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Power of MySQL Storage Engines

 | March 5, 2007 |  Posted In: Insight for DBAs

Where does real power of MySQL Storage Engines, and pluggable storage engines as MySQL 5.1 lays ? It is very much advertised this allows third parties to create their own storage engines and we can see solutions as Solid and PBXT . Plus there is Falcon storage engine being developed inside MySQL. All of these […]

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System size and Performance Optimization

 | February 27, 2007 |  Posted In: Insight for Developers

Performance optimization is never ending story, you can virtually always find something else to optimize but while on generic system, not tuned by expert you often can get significant performance increase in the matter of hours further performance improvements become more and more time consuming and expensive and gains smaller. This observation does not only […]

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Pitfalls of converting to InnoDB

 | February 25, 2007 |  Posted In: Insight for DBAs

We often recommend to our clients to convert their current database from MyISAM tables to InnoDB. The transfer by itself in most cases is almost plain, however the application can be broken by new unexpected errors 1205 (ER_LOCK_WAIT_TIMEOUT) Lock wait timeout expired. Transaction was rolled back. 1213 (ER_LOCK_DEADLOCK) Transaction deadlock. You should rerun the transaction.

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MySQL Error control changes

 | February 19, 2007 |  Posted In: Insight for Developers

In MySQL 5.0 mainly error control was improved, such as strict mode was added to change famous MySQL behavior of cutting too large strings, too big numbers and allowing you to use dates such as February 31st. In one case however reverse change was done – in regards to storage engine initialization. Previously if you […]

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Beware: key_buffer_size larger than 4G does not work

 | February 14, 2007 |  Posted In: Insight for DBAs

I was working with customer today which has MySQL on a system with some 64GB or RAM running MyISAM, so they set key_buffer_size to 16G… and every few days MySQL crashes. Why ? Because key_buffer_size over 4GB in size is not really supported (checked with latest and greatest MySQL Enterprise 5.0.34). It works just fine […]

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Getting use of Slave in MySQL Replication

 | February 14, 2007 |  Posted In: Insight for Developers

MySQL Replication is asynchronous which causes problems if you would like to use MySQL Slave as it can contain stale data. It is true delay is often insignificant but in times of heavy load or in case you was running some heavy queries on the master which not take time to replicate to the slave […]

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