Home |  MySQL Buzz |  FAQ |  Feeds |  Submit your blog feed |  Feedback |  Archive |  Aggregate feed RSS 2.0 English Deutsch Español Français Italiano 日本語 Русский Português 中文
Previous 30 Newer Entries Showing entries 31 to 60 of 255 Next 30 Older Entries

Displaying posts with tag: Group Blog Posts (reset)

My broken Planet MySQL feed..
+0 Vote Up -0Vote Down
As those of you with an interest in MySQL may have seen, I’ve recently surged into the list of “Most Active Authors” on Planet MySQL, alas I’m not as prolific a blogger as it may seem, and this is purely down to an error with the feed I submitted to Planet MySQL. Having recently joined [...]
A review of Tungsten Replicator: Part 1 – Installation
+9 Vote Up -0Vote Down
I’ve been following the development of Tungsten Replicator for quiet some time now, and recently was fortunate enough to find the time to take a look at the product in more detail. If you haven’t heard of Tungsten Replicator yet, it’s an open source database replication engine that can be used to complement or completely [...]
Curious case with MySQL replication
+2 Vote Up -0Vote Down

MySQL Replication is a powerful tool and it’s hard to find a production system not using it. On the other hand debugging replication issues can be very hard and time consuming. Especially if your replication setup is not straightforward and you are using filtering of some kind.

Recently we got an alert from our monitoring system that replication stopped on production slave with the following error:

Can't find record in 'some_table', Error_code: 1032;
handler error HA_ERR_KEY_NOT_FOUND;
the event's master log binlog.000011, end_log_pos 735766642

This means that a ROW-based replication event was going to be applied on slave, but could not find the row it was supposed to be applied to. This is something I like about ROW format — it allows you to catch such data synchronization issues right away. In this particular case MIXED format was used, but if



  [Read more...]
RDBMS Online Patching
+0 Vote Up -1Vote Down

If you support Oracle RDBMS 11.2.0.2 and want to zero downtime applying
patches to databases then it is time to have a look at new possibility
of Online Patching delivered with 11.2.0.2 version and described here
RDBMS Online Patching Aka Hot Patching [ID 761111.1]

The syntax is “opatch apply online -connectString … ” but I could not find description
of the online option (only -connectString) using opatch -help (version 11.2.0.1.6)
although based on the note it is available since 11.1.0.6 version of opatch

And while going through README for








  [Read more...]
Alter waiting on Select statement to complete
+1 Vote Up -0Vote Down

A few days ago, we faced an interesting problem on one of our customer’s slave mysqld servers.  An Alter for adding a new column was run on master server took 542 seconds where as it took few hours on the slave server to complete due to a SELECT blocking the Alter was not allowed to complete.

Here is the the select on the master server and it’s execution time from the binary logs.

# at 825737566
#110720 19:55:21 server id 31415  end_log_pos 825737730         Query   thread_id=83250629      exec_time=542   error_code=0
use collect/*!*/;
SET TIMESTAMP=1311216921/*!*/;
/*!\C latin1 *//*!*/;
SET @@session.character_set_client=8,@@session.collation_connection=8,@@session.collation_server=8/*!*/;
ALTER TABLE `track` ADD `source_track_id` int(10) UNSIGNED NULL DEFAULT NULL  AFTER `vendor_track_id`
/*!*/;

Alter statement completed well on the



  [Read more...]
Viewing RMAN jobs status and output
+0 Vote Up -1Vote Down

Yesterday I was discussing with a fellow DBA about ways to check the status of existing and/or past RMAN jobs. Good backup scripts usually write their output to some sort of log file so, checking the output is usually a straight-forward task. However, backup jobs can be scheduled in many different ways (crontab, Grid Control, Scheduled Tasks, etc) and finding the log file may be tricky if you don’t know the environment well.
Furthermore, log files may also have already been overwritten by the next backup or simply just deleted. An alternative way of accessing that information, thus, may come handy.

Fortunately, RMAN keeps the backup metadata around for some time and it can be accessed through the database’s V$ views. Obviously, if you need this information because your database just crashed and needs to be restored, the method described here is useless.


  [Read more...]
Oracle Exadata “technology that most changed his life” – says Oracle ACE & Pythian DBA Fahd Mirza.
+0 Vote Up -0Vote Down

Pythian’s Oracle ACE, Fahd Mirza appears in this month’s Community: Peer-to-Peer review “In With the New“, as published in the September/October 2011 issue of Oracle Magazine.

Fahd states that “Oracle Exadata Database Machine” has most changed his life – changing the game, and setting very high standards of performance, support, scalability, reliability and unification.

Shout out to Fahd from your peers at Pythian!

I guess there might be just a little truth to Pythian’s growing reputation as an “Oracle ACE Factory” ;), as recently mentioned by Justin Kestelyn in the May 11, 2011 OPN PartnerCast:

  [Read more...]
Pythian Speaking at Oracle OpenWorld 2011
+0 Vote Up -0Vote Down

Pythian is pleased to announce our speaking schedule at this year’s Oracle OpenWorld 2011, October 2-6, 2011 in San Francisco, CA.

We’re excited to be joined by our customers Western Union, and Worldwide Technologies (WWT) as we present real-world experiences and project success. If you’re attending, don’t miss the chance to hear our team of experts. Bring your toughest questions to be answered as they relate to any of the subjects below.

  [Read more...]
How to Run a Streaming Backup with innobackupex
+0 Vote Up -0Vote Down

On many of our clients, we have a need to run XtraBackup as a regular OS user. Aside from running into the issue where tar4ibd was not provided with Percona’s xtrabackup-1.6.2.tar.gz package, our main issues have been with permissions when attempting a streaming backup.

I have found the following:

  • The user needs permissions for a temp directory to stream to/from. The my.cnf of the target database cannot be used because the user does not have permission to write to /tmp/mysql-stdout, so we set a tmpdir in a separate defaults-file.
  • A backup target directory must be used that the user has read/write permissions to. It seems to me a target directory should not be
  •   [Read more...]
    Silent MyISAM Table Definition Changes and mysqldump
    +2 Vote Up -0Vote Down

    The other day while trying to move a schema from one MySQL server to another, I encountered a very odd issue. The schema to be moved contained both MyISAM and InnoDB tables, so the only option I had was to dump the schema using mysqldump on the source server and import it on the destination server. The dump on the source server went fine with absolutely no issues but it failed to import into the second server, and the error message was:

    Can't create/write to file ‘/disk1/activity.MYI’ (Errcode: 2)


    This was an extremely odd message as the data directory on the destination server was properly setup in terms of ownership and permission. The source and destination MySQL servers have been running without issues for months. Prior to the error, four tables in the dump file were imported into the destination server without any issues whatsoever.

      [Read more...]
    Day One at PGEast 11
    +3 Vote Up -1Vote Down

    I guess I brought the snow with me to New York as I awoke to a nice 10cm dump. Anyway today would best be described as a day of ‘Disruptive Tech’

    I first attended Kevin Kempters intro into PorstgreSQL High Availability. A very well balanced presentation that gave a very good overview of what is available out of the box for both Warm Standbys and Hot Standbys how they can be very easily implemented. He also gave a quick overview of other tools that can be used including Slony for detailed fail-overs and PgPool for load balancing and relication. Not very disruptive but it does show that Pg is on par with most of the heavy hitters such as MySQL and Oracle.

    The keynote this year was by Ed Boyajian the CEO or EnerpriseDB and he gave an big picture of the DB in terms of market which is a whopping 26$ Billion a year in the US alone of which the the two five players have 90% of the

      [Read more...]
    Log Buffer #210, A Carnival of the Vanities for DBAs
    +1 Vote Up -1Vote Down

    Welcome to Log Buffer, the weekly news update of happenings in the database world.

    Its the holiday season and many DBAs would rather cuddle at home with their family rather than do exciting work and blog about it. Can you imagine? Many thanks to Fahd Mizra who helped me by collecting DB2 news. Grab your snuggie and cuddle up with Log Buffer #210.

    MySQL:

    Giuseppe Maxia, the Data Charmer looked for a way to add comments into the binary log and created an interesting discussion on the topic.

    You’d think that having some

      [Read more...]
    Log Buffer #209, A Carnival of the Vanities for DBAs
    +0 Vote Up -0Vote Down

    Welcome to Log Buffer, the weekly news update of happenings in the database world.

    A big shout out to Pythian team members Andrey, Gwen, Fahd, and Don for their submissions. We have lots of news and recommended reading this week so let’s get going with Log Buffer #209.

    Andrey Goryunov’s top picks:

    Dion Cho, the Oracle Performance Storyteller, provides an explanation of parallel DML execution plan.



      [Read more...]
    Log Buffer #208, A Carnival of the Vanities for DBAs
    +0 Vote Up -1Vote Down

    Welcome to Log Buffer, the weekly round up of news and happenings in the database world.

    We’re planning our publishing calendar for 2011. Happy to announce that we’ll have a few guest hosts in the New Year. Don’t forget if you’d like to host or edit a future edition of Log Buffer on your own blog, send a note to the Log Buffer coordinator.

    We’ve had several contributions of favorite reads from the team this week. Enjoy this issue, Log Buffer #208.

      [Read more...]
    Log Buffer #206, A Carnival of the Vanities for DBAs
    +0 Vote Up -0Vote Down

    Welcome to Log Buffer, the weekly news blog about blogs in the datasphere… As we kick off Log Buffer #206, our own Gwen Shapira shares a few of her weekly favorites:

    Oracle:

    Arup Nanda posted an excellent script on how to summarize backup information from the rman catalog. He also

      [Read more...]
    Log Buffer #205, A Carnival of the Vanities for DBAs
    +0 Vote Up -0Vote Down

    A very warm welcome to the Log Buffer, the premier medley of fresh information culled from the blogs related to the technology which stores the world, yes, the databases.

    In this edition, the Log Buffer #205, we have yet again found the pulse of the industry.

    Oracle:

    On the Oracle front, leading Oracle technologist Andrey Goryunov carries on his hands-on experiments of newest version of the Oracle database. This time he slices away chopt.

    It’s always very informative and exciting to know about internals of RAC Stuff like what actually is maintained in the Voting Disk . Riyaj has it

      [Read more...]
    Log Buffer #204, A Carnival of the Vanities for DBAs
    +0 Vote Up -0Vote Down

    Welcome to Log Buffer, the weekly roundup of happenings in the database world.

    Lots to cover this week, so let’s get on with Log Buffer #204. Enjoy!

    Oracle:

    Pythian’s Gwen Shapira dabbles with MySQL and explores MySQL troubleshooting for the Oracle DBA.

    Venkat Janakiraman explores how connectivity works for BI EE 11g

      [Read more...]
    Log Buffer #203, A Carnival of the Vanities for DBAs
    +1 Vote Up -0Vote Down

    Welcome to Log Buffer. The weekly roundup of posts, and news of what’s happening in the database world.

    At Pythian, we’re pretty much recovered from a hectic Oracle OpenWorld 2010, and I’m no longer an OOW virgin. What an experience! I had the pleasure of meeting many of you Log Buffer readers and contributors at the Annual Blogger’s Meetup at Jillian’s. Great to put faces to names. And I now officially feel like “Vanessa from Log Buffer”, as many of your t-shirts will show.

    Many thanks to Marc Fielding for providing the hot items for this week’s post,

      [Read more...]
    Log Buffer #202, A Carnival of The Vanities for DBAs
    +0 Vote Up -0Vote Down

    Welcome to Log Buffer, the weekly roundup of database industry news. We’re only a week or so away from Oracle OpenWorld. Everyone is buzzing with activity, promoting their speaking sessions and making last minute plans. For all of you bloggers who will be attending, don’t miss the annual Bloggers Meetup, announced recently by Alex Gorbachev. “Count yourself in” if you’ll be joining the gang so that accurate attendee numbers can be provided to Jillian’s to ensure everyone is well fed and watered ;)

    In recent days, if anything has created massive tremors  [Read more...]
    Log Buffer #199, A Carnival of the Vanities for DBAs
    +0 Vote Up -1Vote Down

    Welcome to Log Buffer. The weekly review of DBA industry news. Enjoy Log Buffer #199.

    Remember if you find a link or interesting blog post that you think Log Buffer should mention, send a note to the editor at Log Buffer and be sure to include the link, and a short note outlining why you think that particular post would be of value to other DBAs, or what you learned from reading it.

    And, for inquiries about hosting or editing a future edition of Log Buffer on your own blog, send your query to the Log

      [Read more...]
    YAPCEU 2010 – Day Two…
    +1 Vote Up -0Vote Down

    After enjoying the excellent hospitality of our host here in Pisa (6 courses) we were ready for our second day at YAPCEU 2010 here in sunny Pisa.

    Larry’s new catch phrase “My Language is a four letter word” was the ‘Buzz word’ for today. We settled down to some very interesting talks, the highlight for me being Tim Bunce’s talk on using Devel::NYTProf to Optimize your code. Tim first gave us a quick and dirty overview of optimization which covered the basics of where to start and what to look for he followed up with real examples of Optimizer output and than wrapped up with a few before and after results on an optimization effort.

    The rest of the day was dedicated in my opinion, to the future of DBs in with Nelson Ferraz giving an excellent presentation of his concepts for using Perl as to glue for a Data Warehouse application. Next on my agenda,

      [Read more...]
    Log Buffer #198, A Carnival of the Vanities for DBAs
    +0 Vote Up -0Vote Down

    Welcome to Log Buffer, a weekly review of the database industry. This week’s issue Log Buffer #198 is generously published by Sam DeFilippis, who manages Oracle Notes blogs, with latest postings on Oracle GoldenGate.

    As always, if you’d like to host your own issue of Log Buffer, simply reach out to the Log Buffer coordinator.
    Please enjoy Sam’s issue

      [Read more...]
    Log Buffer #197, A Carnival of the Vanities for DBAs
    +1 Vote Up -0Vote Down

    Log Buffer #197 marks the middle of summer, and the fact that we’re a mere two weeks away from our 200th edition.

    To begin this week’s reading, I’d like to highlight two Oracle blogs maintained by Sam J. DeFilippis: Oracle Notes, where he’s recently posted about troubleshooting GoldenGate and positioning a read of Extract/Replicat Trail file or Oracle redo

      [Read more...]
    Determining I/O Throughput for a System
    +3 Vote Up -3Vote Down

    At Kscope this year, I attended a half day in-depth session entitled Data Warehousing Performance Best Practices, given by Maria Colgan of Oracle. In that session, there was a section on how to determine I/O throughput for a system, because in data warehousing I/O per second (iops) is less important than I/O throughput (how much actual data goes through, not just how many reads/writes).

    The section contained an Oracle-specific in-database tool, and a standalone tool that can be used on many operating systems, regardless of whether or not a database exists:

    If Oracle is installed, run DBMS_RESOURCE_MANAGER.CALIBRATE_IO:

    SET SERVEROUTPUT ON
    DECLARE


      [Read more...]
    Online Verification That Master and Slaves are in Sync
    +5 Vote Up -1Vote Down

    In October 2008, Baron posted How to Check MySQL Replication Integrity Continually. Here at Pythian we have developed a method based on that post, and added “verifying that masters and slaves are in sync” to our standard battery of tests.

    We call it “Continual replication sync checking”. This article will explain how it works, how to test and make the procedure non-blocking, benchmarks from the real world, issues we encountered along the way, and finally

      [Read more...]
    Log Buffer #196, A Carnival of the Vanities for DBAs
    +1 Vote Up -0Vote Down

    Welcome to Log Buffer, the weekly roundup of database industry news.

    For your reading pleasure this week we have Log Buffer #196:

    Charles Hooper blogs about an in-depth investigation on what can cause Oracle to ignore a hint.

    Doug Burns reminds his readers that there are only two weeks left to

      [Read more...]
    Log Buffer #194, A Carnival of The Vanities for DBAs
    +1 Vote Up -1Vote Down

    We’re well into summer and almost at our 200th edition of Log Buffer, a blog of blogs about the database world.

    Remember if you find a link or interesting blog post that you think Log Buffer should mention, send a note to the editor at Log Buffer and be sure to include the link, and a short note outlining why you think that particular post would be of value to other DBAs, or what you learned from reading it.

    Now on to our weekly reading in Log Buffer #194:

    Oracle Exadata is a topic that is getting hotter and hotter. Following Pythian’s announcement of Exadata services Oracle’s

      [Read more...]
    The XLDB4 Conference for Very Large Databases
    +9 Vote Up -3Vote Down

    Ronald saved me a post by giving his feedback on a few Oracle conferences that now have MySQL content.

    My opinion is pretty much a summary of Ronald’s post, so I won’t repeat it here. Instead, I’ll post about a conference he did not, the 4th Extremely Large Databases Conference. I am particularly interested in any MySQL folks planning to attend (I would expect Tokutek to be represented, and maybe even the Calpont folks).

    Most of this is directly from an e-mail I received from Jacek Becla, who had a keynote at the 2008 MySQL User Conference and Expo. If you also received

      [Read more...]
    Log Buffer #193 – A Carnival of The Vanities for DBAs
    +1 Vote Up -0Vote Down

    Welcome to Log Buffer, the weekly roundup of DBA industry happenings.

    Read on for the latest updates in Log Buffer #193. Don’t forget, we’re always looking for volunteer editors to publish and host an issue of Log Buffer. If you’d like this to be you, contact the Log Buffer coordinator.

    ODTUG/Kaleidoscope 2010 roundup:

    Sheeri

      [Read more...]
    Log Buffer #190, A Carnival of the Vanities for DBAs
    +0 Vote Up -0Vote Down

    Welcome to Log Buffer, the weekly roundup of database blogs. We’re back this week with a short Log Buffer #190. Only ten more issues, and we’ll be celebrating our 200th edition post.

    Chen Shapira was eager to share news early this week, sending along her favorite picks on Tuesday.

    Prof. Neil Gunther doesn’t like the way commercial load testing software distributes think times.



      [Read more...]
    Previous 30 Newer Entries Showing entries 31 to 60 of 255 Next 30 Older Entries

    Planet MySQL © 1995, 2014, Oracle Corporation and/or its affiliates   Legal Policies | Your Privacy Rights | Terms of Use

    Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.