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Showing entries 1 to 10 of 34051 10 Older Entries
Improving Percona XtraDB Cluster SST startup with Google Compute Engine snapshots
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As the need for information grows so does the size of data we need to keep in our databases. SST is unavoidable for spinning up new nodes in a PXC cluster and when datasets reach the “terra-byte” range this becomes ever more cumbersome requiring many hours for a new node to synchronize.

More often that not, it is necessary to implement custom “wsrep_sst” scripts or resort to manual synchronization processes. Luckily cloud providers provide convenient methods to leverage disk snapshots that can be used …

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MySQL Character encoding – part 2
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In MySQL Character encoding – part 1 we stated that the myriad of ways in which character encoding can be controlled can lead to many situations where your data may not be available as expected.

UTF8 was designed on a placemat in a New Jersey diner one night in September or so 1992.

Setting MySQL Client and Server Character encoding.

Lets restart MySQL with the correct setting for our purpose, UTF8. Here …

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MySQL Cluster on my "Windows computer"
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It's been some time since I wrote my last blog. As usual this means that I have
been busy developing new things. Most of my blogs are about describing new
developments that happened in the MySQL Server, MySQL Cluster, MySQL
partitioning and other areas I have been busy developing in. For the last year I have
been quite busy in working with MySQL Cluster 7.4, the newest cluster release. As
usual we have been able to add some performance improvements. But for
MySQL Cluster 7.4 the goal has also been to improve quality. There are a number
of ways that one can improve quality. One can improve quality …

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MySQL Tech Tour in Oslo Norway on March the 17th!
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MySQL Tech Tour: Out of the Box MySQL High Availability - Performance - Scalability
March 17, 2015, Oslo, Norway

Did you know that the new MySQL Fabric delivers High Availability with automatic failure detection and failover? And that MySQL Fabric also enables scale-out with automated data sharding? Do you know how to take advantage of the MySQL SYS Schema?

Join us for this free MySQL Tech Tour to learn straight from the source how you can benefit from Oracle’s latest MySQL innovations. Our technical experts will help you understand how to take advantage of the wide range of new features and enhancements …

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Table and tablespace encryption on MariaDB 10.1.3
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For the moment, the only engines that fully support encryption are XtraDB and InnoDB. The Aria storage engine also supports encryption, but only for temporary tables.

MariaDB supports 2 different way to encrypt data in InnoDB/XtraDB:

  1. Table encryption: Only tables which you create with PAGE_ENCRYPTION=1 are encrypted. This feature was created by eperi.
  2. Tablespace encryption: Everything is encrypted (including log files). This feature was created by Google and is based on their …
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March 17 Webinar: How Indexes Work in MySQL
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MySQL offers a few different types of indexes and uses them in a variety of ways. There’s a lot to know about the various kinds of indexes and how they interact with the storage engines, and it’s all very important for query optimization. A few examples are listed below:

  • The “leftmost prefix rule”

  • Clustered primary indexes versus secondary indexes

  • B-Tree and hash

  • New types of indexes such as LSM and Fractal Trees

  • Newer features in the query optimizer and executor in …

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Access Shard-Query with the MySQL client without using MySQL proxy
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One of the great features of Shard-Query is the ability to use MySQL proxy to access resultsets transparently. While this is a great tool, many people have expressed reservations about using MySQL Proxy, an alpha component in their production environment.

I recognize that this is a valid concern, and have implemented an alternate method of retrieving resultsets directly in the MySQL client, without using a proxy. This means that any node can easily act as the “head” node without any extra daemon, instead of having to run many proxies.

The sq_helper() routine has been checked into the git …

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The ocelotgui debugger
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I have merged a debugger for MySQL/MariaDB stored procedures and functions into our GUI client and posted the source and binaries on github. It allows breakpoint, clear, continue, next, skip, step, tbreakpoint, and variable displays. Features which are rare or missing in other debuggers include:
its current platform is Linux;
it allows breakpoints on functions which are invoked within SQL statements;
it never changes existing stored procedures or functions;
it is integrated with a general GUI client;
it allows commands like gdb and allows menu items / shortcut keys like ddd; …

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Bad Benchmarketing and the Bar Chart
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Technical conferences are flooded with visual [mis]representations of a particular product's performance, compression, cost effectiveness, micro-transactions per flux-capacitor, or whatever two-axis comparison someone dreams up. Lets be honest, benchmarketers like to believe we all suffer from innumeracy.

The Merriam-Webster dictionary defines innumeracy as follows:
innumeracy (noun): marked by an ignorance of mathematics and the scientific approach

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Emulating MySQL roles with the Percona PAM plugin and proxy users
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From time to time people wonder how to implement roles in MySQL. This can be useful for companies having to deal with many user accounts or for companies with tight security requirements (PCI or HIPAA for instance). Roles do not exist in regular MySQL but here is an example on how to emulate them using Percona Server, the PAM plugin and proxy users.

The goal

Say we have 2 databases: db1 and db2, and we want to be able to create 3 roles:

  • db1_dev: can read and write on db1 only.
  • db2_dev: can read and write on db2 only. …
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Showing entries 1 to 10 of 34051 10 Older Entries

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