Post: Scaling problems still exist in MySQL 5.5 and Percona Server 5.5
MySQL 5.5 and Percona Server 5.5 do not solve all scalability problems even for read only workloads. Workloads which … I have compared Percona Server 5.1.56-12.7 and Percona Server 5.5.11-20.2 with...
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InnoDB, InnoDB-plugin vs XtraDB on fast storage
To continue fun with FusionIO cards, I wanted to check how MySQL / InnoDB performs here. For benchmark I took MySQL 5.1.42 with built-in InnoDB, InnoDB-plugin 1.0.6, and XtraDB 1.0.6-9 ( InnoDB with...
View ArticleEstimating Replication Capacity
It is easy for MySQL replication to become bottleneck when Master server is not seriously loaded and the more cores and hard drives the get the larger the difference becomes, as long as replication...
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Shard-Query adds parallelism to queries
Preamble: On performance, workload and scalability: MySQL has always been focused on OLTP workloads. In fact, both Percona Server and MySQL 5.5.7rc have numerous performance improvements which benefit...
View ArticleUsing Flexviews – part two, change data capture
In my previous post I introduced materialized view concepts. This post begins with an introduction to change data capture technology and describes some of the ways in which it can be leveraged for your...
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Infinite Replication Loop
Last week I helped 2 different customers with infinite replication loops. I decided to write a blog post about these infinite loop of binary log statements in MySQL Replication. To explain what they...
View ArticleSide load may massively impact your MySQL Performance
When we’re looking at benchmarks we typically run some stable workload and we run it in isolation – nothing else is happening on the system. This is not however how things happen in real world when we...
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kernel_mutex problem. Or double throughput with single variable
Problem with kernel_mutex in MySQL 5.1 and MySQL 5.5 is known: Bug report. In fact in MySQL 5.6 there are some fixes that suppose to provide a solution, but MySQL 5.6 yet has long way ahead before...
View ArticleIdentifying the load with the help of pt-query-digest and Percona Server
OverviewProfiling, analyzing and then fixing queries is likely the most oft-repeated part of a job of a DBA and one that keeps evolving, as new features are added to the application new queries pop up...
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Impact of memory allocators on MySQL performance
MySQL server intensively uses dynamic memory allocation so a good choice of memory allocator is quite important for the proper utilization of CPU/RAM resources. Efficient memory allocator should help...
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