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Showing entries 1 to 10 of 34415 10 Older Entries
History Repeats: MySQL, MongoDB, Percona, and Open Source
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History is repeating again. MongoDB is breaking out of the niche into the mainstream, performance and instrumentation are terrible in specific cases, MongoDB isn’t able to fix all the problems alone, and an ecosystem is growing.

This should really be a series of blog posts, because there’s a book’s worth of things happening, but I’ll summarize instead.

  • MongoDB is in many respects closely following MySQL’s development, 10 years offset. Single index per query, MyISAM-like storage engine, etc. Background.
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Optimizing Out-of-order Parallel Replication with MariaDB 10.0
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Fri, 2015-05-22 07:19geoff_montee_g

Out-of-order parallel replication is a great feature in MariaDB 10.0 that improves replication performance by committing independent transactions in parallel on a slave. If slave_parallel_threads is greater than 0, then the SQL thread will instruct multiple worker threads to concurrently apply transactions with different …

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Decrypt .mylogin.cnf
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General-purpose MySQL applications should read MySQL option files like /etc/my.cnf, ~/.my.cnf, ... and ~/.mylogin.cnf. But ~/.mylogin.cnf is encrypted. That's a problem for our ocelotgui GUI application, and I suppose other writers of Linux applications could face the same problem, so I'll share the code we'll use to solve it.

First some words of defence. I think that encryption (or more correctly obfuscation) is okay as an option: a customer asked for it, …

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Creating and Restoring Database Backups With mysqldump and MySQL Enterprise Backup – Part 2 of 2
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In part one of this post, I gave you a couple examples of how to backup your MySQL databases using mysqldump. In part two, I will show you how to use the MySQL Enterprise Backup (MEB) to create a full and partial backup.



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Bash Arrays & Oracle
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Last week, I wrote about how to use bash arrays and the MySQL database to create unit and integration test scripts. While the MySQL example was nice for some users, there were some others who wanted me to show how to write bash shell scripts for Oracle unit and integration testing. That’s what this blog post does.

If you don’t know much about bash shell, you should start with the prior post to learn about bash arrays, if-statements, and for-loops. In this blog post I only cover how to implement a bash

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Updates To Our Fault Detection Algorithm
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Unexpected downtime is one of your worst nightmares, but most attempts to find problems before they happen are threshold-based. Thresholds create noise, and alerts create false positives so often you may miss actual problems.

When we began building VividCortex, we introduced Adaptive Fault Detection, a feature to detect problems through a combination of statistical anomaly detection and queueing theory. It’s our patent-pending technique to detect system stalls in the database and disk. These are early indicators of serious problems, so it’s really helpful to find them. (Note: “fault” is kind of an ambiguous term for some people. In …

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Log Buffer #423: A Carnival of the Vanities for DBAs
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This Log Buffer edition covers Oracle, SQL Server and MySQL blog posts from all over the blogosphere!


Oracle:

Hey DBAs:  You know you can  install and run Oracle Database 12c on different platforms, but if you install it on an Oracle Solaris 11 zone, you can take additional advantages.

Here is a video with Oracle VP of Global Hardware Systems Harish …


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Percona XtraBackup 2.3.1-beta1 is now available
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Percona is glad to announce the release of Percona XtraBackup 2.3.1-beta1 on May 20th 2015. Downloads are available from our download site here. This BETA release, will be available in Debian

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A quick update on our native Data Dictionary
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In July 2014, I wrote that we were working on a new native InnoDB data dictionary to replace MySQL's legacy frm files.

This is quite possibly the largest internals change to MySQL in modern history, and will unlock a number of previous limitations, as well as simplify a number of failure states for both replication and crash recovery.

With MySQL 5.7 approaching release candidate (and large changes always coming with risk attached) we decided that the timing to try to merge in a new data dictionary was just too …

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Showing entries 1 to 10 of 34415 10 Older Entries

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