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Displaying posts with tag: read only (reset)

Better high availability: MySQL and Percona XtraDB Cluster with good application design
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High Availability

Have you ever wondered if your application should be able to work in read-only mode? How important is that question?

MySQL seems to be the most popular database solution for web-based products. Most typical Internet application workloads consist of many reads, with usually few writes. There are exceptions of course – MMO games for instance – but …

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Better scaling of read-only workloads
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The problem and its cause

There have been several complaints over the years about InnoDB’s inability to scale beyond 256 connections. One of the main issues behind this scalability bottleneck was the read view creation that is required for MVCC (Multi Version Concurrency Control) to work. When the user starts a transaction this is what InnoDB does under the hood:

  • Create or reuse a transaction instance – usually it is reused, the transactions are reused from a pool (trx_sys_t::mysql_trx_list).
  • Initialize the transaction start time and assign a rollback segment
  • Append the …

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