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10 Newer Entries Showing entries 31 to 40 of 977 10 Older Entries

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NDB 7.4 & SYS schema: When getting locks, detecting the guilty SQL & o.s.pid.
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Here’s a way to detect the sql query causing a lock or a session to fail, and also to identify the o.s.pid if need be (btw, no rocket science). “a” way.. I’m sure there are many others, so feel free to suggest, please.

So, we’re using MCM, and have created a MySQL Cluster like mentioned in the cluster intro session (in Spanish I’m afraid), using 7.4.6, which comes with 5.6.24.

With the env up and running, set up a schema, some data and run a few queries:

mysql> create database …
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Error: 1034 HY000 Incorrect key file for table /tmp/#sql_actor_return; try to repair it
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It mentions in the message that you can try to repair it. Also, if you look at the actual FILEPATH you get, you can find out more:

  • if it is something like /tmp/#sql_actor_return it means that MySQL needs to create a temporary table because of the query size. It stores it in /tmp, and that there is not enough space in your /tmp for that temporary table. increase the tmp_table_size variable and /tmp/ partition size
  • If it contains the name of an actual table instead, it means that this table is very likely corrupted and you should repair it using  …
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MySQL ERROR 1114 : The table is full
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If a table-full error occurs, it may be that the disk is full or that the table has reached its maximum size. The effective maximum table size for MySQL databases is usually determined by operating system constraints on file sizes, not by MySQL internal limits.

Limits on Table size : The following table lists some examples of operating system file-size limits. This is only a rough guide and is not intended to be definitive.

If you do encounter a full-table error, there are several reasons why it might have occurred:

  • The …
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on ORDER BY optimization | Domas Mituzas
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http://dom.as/2015/07/30/on-order-by-optimization/

An insightful exploration by Domas (Facebook) on how some of the MySQL optimiser’s decision logic is sometimes naive, in this case regarding ORDER BY optimisation.

Quite often, “simple” logic can work better than complex logic as chasing all the corner cases can just make things worse – but sometimes, logic can be too simple.

Everything must be made as simple as possible, but no simpler.
— Albert Einstein / Roger Sessions

MySQL in a USB, with a little help of Fabric
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If you’ve wanted to see how well MySQL Fabric actually works and how easy it makes setting up replication and switching Masters & Slaves back and forth, with a sample use case of having the master stored in a USB stick, then feel free to have a look at:

http://www.slideshare.net/keithhollman5/mysql-fabric-in-a-usb

o la versión en Español:

http://www.slideshare.net/keithhollman5/mysql-fabric-en-un-usb

Please let …

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Amazon Aurora has gone GA!
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See Jeff Barr’s blog post:

https://aws.amazon.com/blogs/aws/now-available-amazon-aurora/


The JavaScript Connector for MySQL you never heard of
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It’s easier now than ever before to stand up a web server and connect it to a database using node.js and Express. Using node.js to get data out of a relational database used to require that users become well versed in SQL technology.

So the MySQL dev team started on a project to make it trivial (well, easy) to store and retrieve documents from MySQL and deliver them to node.js applications. Without using SQL. The result is  called mysql-js and I’d like to introduce it to you. You can download it today at  …

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MySQL Enterprise Audit – parsing audit information from log files, inserting into MySQL table
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The MySQL Enterprise Audit plug-in is part of the MySQL Enterprise Edition (available through a paid license). Basically, Enterprise Audit tracks everything that is happening on your MySQL server, and can be used to protect/detect the misuse of information, and to meet popular compliance regulations including HIPAA, …

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MySQL Cluster: Una introducción en Español.
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MySQL Cluster: El ‘qué’ y el ‘cómo’.

Para aquellos que encuentran mucho sobre MySQL en Inglés pero poco en Español: mi pequeña aportación.
En el enlace tenéis información sobre qué es MySQL Cluster y cómo funciona. Incluso con ejemplos técnicos para romper las barreras y ayudar a simplificarlo (espero).

¡A disfrutar!


Removal and Deprecation in MySQL 5.7 | MySQL Server Blog
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http://mysqlserverteam.com/removal-and-deprecation-in-mysql-5-7/

A useful overview of options, syntax and tools that have been deprecated or removed for the upcoming MySQL 5.7 release.

10 Newer Entries Showing entries 31 to 40 of 977 10 Older Entries

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