Showing entries 31 to 40 of 902
« 10 Newer Entries | 10 Older Entries »
Displaying posts with tag: innodb (reset)
Fun with Bugs #41 - Bugs Fixed in MySQL 5.7.11

I've just noted that Oracle had released new versions of MySQL on February 5, 2016 formally, so while these days I am mostly thinking about the ways to do support properly, remembering my colleagues and trying to understand some of RocksDB internals, it's time to postpone all these and write about bugs again. This time about some of the public bug reports from MySQL Community and Oracle engineers that were fixed by Oracle in MySQL 5.7.11.

As usual, I'll try to mention who had reported a bug and who verified it, as I think that names matter in MySQL world. I'll concentrate mostly on InnoDB, replication and optimizer bug reports, trying to highlight regressions clearly.

As usual, I prefer to start with InnoDB bugs:

[Read more]
MySQL Support People - Percona Support

I planned to continue this series of posts with the one about MySQL Support engineers who joined us in Oracle while I was working there, but based on recent events in my life I'd prefer to postpone it and move directly to the team I worked for during last 3+ years, Percona Support Team.

Disclamer: In the list below I still try to pay attention to public contribution by each of engineers mentioned to MySQL Community, mostly in a form of bug reports. This is not the only way they contributed, but I have to stick to this format in current series of posts. I also base my comments mostly on my memory and quick search of public sources of information, so I may be mistaking about the roles, time periods and other details. Please, inform me if you think there is something to fix.

So, here is the list of my former colleagues who formed the best MySQL Support team in the industry in 2013-2015 while working with me in …

[Read more]
Peter Zaitsev webinar January 27th: Compression In Open Source Databases

Percona invites you to attend a webinar Wednesday, January 27th, with CEO Peter Zaitsev: Compression In Open Source Databases. Register now!

Data growth has been tremendous in the last decade and shows no signs of stopping. To deal with this trend database technologies have implemented a number of approaches, and data compression is by far the most common and important. Compression in open source databases is complicated, and there are a lot of different approaches – each with their own implications.

In this talk we will perform a survey of compression in some of the most popular open source database engines including: Innodb, TokuDB, MongoDB, WiredTiger, RocksDB, and PostgreSQL.

Important information: …

[Read more]
Percona Live Data Performance Conference 2016: news you need to know!

The Percona Live Data Performance Conference 2016 is rapidly approaching, and we’re looking forward to providing an outstanding experience April 18-21 for all whom attend.

Percona Live is the premier event for the rich and diverse open source community and businesses that thrive in the MySQL and NoSQL marketplaces. Attendees include DBAs, sysadmins, developers, architects, CTOs, and CEOs representing organizations from industry giants such as Oracle to start-ups. Vendors increasingly rely on the conference as a major opportunity to connect with potential high-value customers from around the world.

Below are some highlights for the upcoming conference regarding the conference schedule, Tutorial sessions, Birds of a Feather talks, and Lightning talks.

Conference Schedule

Percona Live is packed with engaging sessions, helpful …

[Read more]
Dealing with corrupted InnoDB data

Data corruption! It can happen. Maybe because of a bug or storage problem that you didn’t expect, or MySQL crashes when a page checksum’s result is different from what it expected. Either way, corrupted data can and does occur. What do you do then?

Let’s look at the following example and see what can be done when you face this situation.

We have some valuable data:

> select * from t limit 4;
+---+--------+
| i | c      |
+---+--------+
| 1 | Miguel |
| 2 | Angel  |
| 3 | Miguel |
| 4 | Angel  |
+---+--------+
> select count(*) from t;
+----------+
| count(*) |
+----------+
|  2097152 |
+----------+

One day the query you usually run fails and your application stops working. Even worse, it causes the crash already mentioned:

> select * from t where i=2097151;
ERROR 2006 (HY000): MySQL server has gone away

Usually this is the point when panic starts. The error log …

[Read more]
MySQL Support People - Those Who Were There First

I'd like to devote this long weekend post, the first in a new series, to my current and former colleagues who once worked or still work in a company that provided public MySQL Support service and had a job role of MySQL Support engineer. The list of companies include MySQL AB/Inc ("good old MySQL"), Sun, Oracle, Percona, MariaDB, FromDual, maybe more (I named only those that surely provided or provides MySQL Support for customers outside of the company).

This is not the first time that I write about "people of MySQL", in a wider sense "those who contribute to MySQL Community". Last time it was about …

[Read more]
Using dbsake to recover table structure from .frm files and process mysqldump output

We work on data recoveries quite often. In many cases, we recover table structures from the .frm files because there was no backup available. There is already a great blog post by my colleague Miguel Ángel Nieto about how we can recover structures from .frm files using MySQL utilities.

This works pretty well and we prefer to run mysqlfrm with the “–server” option to get all possible information from a .frm file. However, this option expects that MySQL is up and running so that mysqlfrm can spawn a new MySQL instance, and run the structure recovery there.

Recently I came across a tool that makes this job easier. The name of tool is …

[Read more]
Percona Server 5.7.10-1 first RC available

Percona is glad to announce the first release candidate of Percona Server 5.7.10-1 on December 14, 2015. Download the latest version from the Percona web site or from the Percona Software Repositories.

This release contains all the bug fixes from latest Percona Server 5.6 release (currently Percona Server 5.6.27-76.0).

New …

[Read more]
Fun with Bugs #40 - Bugs fixed in MySQL 5.7.10

MySQL 5.7.10, the first release after MySQL 5.7 GA announcement, appeared almost a week ago. It's interesting to check what bugs reported by MySQL Community were fixed in this version, hence this post (that had to wait during the weekdays busy with usual support work). As usual, I'll concentrate mostly on InnoDB, replication and optimizer-related bug fixes and highlight names of those who reported and verified each bug.

Let's start with InnoDB. The following bugs reported by MySQL Community users were fixed:

  • Bug #78623 - "Small tablespaces with BLOBs take up to 80 times more space in 5.7 than in 5.6". This serious regression was reported by my colleague Laurynas Biveinis and verified by Umesh well before 5.7.9 …
[Read more]
Log Buffer #450: A Carnival of the Vanities for DBAs

This Log Buffer Editions picks few blog posts from Oracle, SQL Server and MySQL.

Oracle:

  • If you grant the DBA role to a user, Oracle also grants it the UNLIMITED TABLESPACE system privilege. If you then revoke the DBA role from this user, Oracle also revokes its UNLIMITED TABLESPACE system privilege.
  • Lost SYSMAN password OEM CC 12gR5.
  • How Terminal Emulation Assists Easy Data Management.
  • Using EMCLI List Verb …
[Read more]
Showing entries 31 to 40 of 902
« 10 Newer Entries | 10 Older Entries »