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Leaving MySQL, MySQL Consulting

 | July 31, 2006 |  Posted In: Insight for DBAs

I’m leaving MySQL starting 1st of August. This is surely not news for my collegues and friends who knew this is comming. We’re starting our own company which will provide MySQL Consulting services. We’ll focus on MySQL Performance Optimization but will be able to help pretty much with all MySQL related issues. We can also […]

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MySQL Crash Recovery

 | July 30, 2006 |  Posted In: Insight for DBAs

MySQL is known for its stability but as any other application it has bugs so it may crash sometime. Also operation system may be flawed, hardware has problems or simply power can go down which all mean similar things – MySQL Shutdown is unexpected and there could be various inconsistences. And this is not only […]

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Returning to InnoDB scalability

 | July 28, 2006 |  Posted In: Insight for DBAs

I’m again returning to InnoDB scalability and related bug #15815 as it hurts many users and customers using multi-cpu servers. Short intro into problem: On 4-CPU box 1 thread executes full-table scan select query for 8 sec, but with 4 threads – each thread executes query for 240 sec. It is very strange as threads […]

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MySQL Query Cache

 | July 27, 2006 |  Posted In: Insight for DBAs

MySQL has a great feature called “Query Cache” which is quite helpful for MySQL Performance optimization tasks but there are number of things you need to know. First let me clarify what MySQL Query Cache is – I’ve seen number of people being confused, thinking MySQL Query Cache is the same as Oracle Query Cache […]

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Extended EXPLAIN

 | July 24, 2006 |  Posted In: Insight for Developers

One nice feature added for EXPLAIN statement in MySQL 4.1 is EXTENDED keyword which provides you with some helpful additional information on query optimization. It should be used together with SHOW WARNINGS to get information about how query looks after transformation as well as what other notes optimizer may wish to tell us. It is […]

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MySQL EXPLAIN limits and errors.

 | July 24, 2006 |  Posted In: Insight for Developers

Running EXPLAIN for problematic queries is very powerful tool for MySQL Performance optimization. If you’ve been using this tool a lot you probably noticed it is not always provide adequate information. Here is list of things you may wish to watch out. EXPLAIN can be wrong – this does not happen very often but it […]

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Stack trace for x86_64 boxes

 | July 19, 2006 |  Posted In: Insight for DBAs

We are going to release several patches which are not included in official MySQL releases. First one is automatically stack trace for x86_64 systems. Currently MySQL resolves stack in crash only for x86 boxes. You can download patch for 5.0.22 source tree here. How to use: place stack64.diff into main source dir; execute patch -p1 […]

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SHOW INNODB STATUS walk through

 | July 17, 2006 |  Posted In: Insight for DBAs

Many people asked me to publish a walk through SHOW INNODB STATUS output, showing what you can learn from SHOW INNODB STATUS output and how to use this info to improve MySQL Performance. To start with basics SHOW INNODB STATUS is command which prints out a lot of internal Innodb performance counters, statistics, information about […]

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How much memory Innodb locks really take ?

 | July 13, 2006 |  Posted In: Insight for DBAs

After playing yesterday a bit with INSERT … SELECT I decided to check is Innodb locks are relly as efficient in terms of low resource usage as they are advertised. Lets start with a bit of background – in Innodb row level locks are implemented by having special lock table, located in the buffer pool […]

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