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10 Newer Entries Showing entries 31 to 40 of 99 10 Older Entries

Displaying posts with tag: Insight for Developers (reset)

Checking B+tree leaf nodes list consistency in InnoDB
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If we have InnoDB pages there are two ways to learn how many records they contain:

  • PAGE_N_RECS field in the page header
  • Count records while walking over the list of records from infimum to supremum

In some previous revision of the recovery tool a short summary was added to a dump which is produced by the constraints_parser.

But if a page is lost and page_parser hasn’t found it, all records from this page are lost. In other words per-page recovery statistics gives us little idea about whether or not a recovered table is complete.

To cover this flaw a new tool index_check is introduced in

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What kind of queries are bad for MySQL?
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In writing a recommendation for our Web development team on how to use MySQL, I came up with the following list, which I want to share: What kind of queries are bad for MySQL?

  • Any query is bad. Send a query only if you must. (Hint: use caching like memcache or redis)
  • Queries that examine many rows are bad. Try instead to use…
    SELECT col1 FROM table1 WHERE primary_key_column=SOMETHING

    . Or at least
    secondary_key_column=SOMETHING

    . If it is still not possible, try to make the query examine the least amount of rows possible (zero is ideal, as we come to the first case here)
  • Queries with JOINS are bad. Try to denormalize the table to avoid JOINS. Example: original query
    SELECT t2.value FROM t2 JOIN t1 ON (t1.id=t2.tid) WHERE t1.orderdate=NOW()

    . This can be denormalized





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Setting up MySQL SSL and secure connections
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There are different articles on how to setup MySQL with SSL but it’s sometimes difficult to end up with a good simple one. Usually, setting up MySQL SSL is not really a smooth process due to such factors like “it’s not your day”, something is broken apparently or the documentation lies I am going to provide the brief instructions on how to setup MySQL with SSL, SSL replication and how to establish secure connections from the console and scripts showing the working examples.

Quick links:

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Choosing a MySQL HA Solution – Post-Webinar Q&A
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Thanks to everyone who was in attendance on 05 June 2013 for my “Choosing a MySQL HA Solution” webinar. If you weren’t able to make it but are interested in listening to the presentation, it’s currently up and available for viewing over at percona.com.

My apologies if we weren’t able to get to your question during the initial session, so I’ll address those lingering questions in this post, along with providing a bit more detail on some of the questions that I did cover during the session.

Q: What

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Implementing SchemaSpy in your MySQL environment
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Lately I have been working with a set of customers on a longer term basis which has given me time to explore new tools using their environments.  One tool that I am finding very helpful is called SchemaSpy.

SchemaSpy is a Java-based tool (requires Java 5 or higher) that analyzes the metadata of a schema in a database and generates a visual representation of it in a browser-displayable format. It lets you click through the hierarchy of database tables via child and parent table relationships as represented by both HTML links and entity-relationship

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MySQL Query Patterns, Optimized – Webinar questions followup
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On Friday I gave a presentation on “MySQL Query Patterns, Optimized” for Percona MySQL Webinars.  If you missed it, you can still register to view the recording and my slides.

Thanks to everyone who attended, and especially to folks who asked the great questions.  I answered as many as we had time for  during the session, but here are all the questions with my complete

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Is your MySQL buffer pool warm? Make it sweat!
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Today’s blog post diving into the waters of the MySQL buffer pool is a cross-post from Groupon’s engineering blog, and is Part 1 of 2. Thank you to Kyle Oppenheim at Groupon for contributing to this project and post. We’ll be posting Part 2 on Thursday. I’ll be at the Percona Live MySQL Conference and Expo next week in Santa Clara, California so look for me there – I’d love to connect and talk more about MySQL buffer pools or anything else that’s on your mind!

There


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Keynotes, BOFs, and the Community Networking Reception at Percona Live MySQL Conference and Expo
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The Percona Live MySQL Conference and Expo begins next Monday and runs April 22-25, 2013. Attendees will see great keynotes from leaders in the industry including representatives from Oracle, Amazon Web Services, HP, Continuent, and Percona. They can also participate in thought provoking Birds of a Feather sessions on Tuesday night and the Wednesday night Community Networking Reception will be fun and entertaining with the presentation of the Community Awards and the Lightning Talks.

If you

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10 years of MySQL User Conferences
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In preparing for this month’s Percona Live MySQL Conference and Expo, I’ve been reminiscing about the annual MySQL User Conference’s history – the 9 times it previously took place in its various reincarnations – and there are a lot of good things, fun things to remember.

2003 was the year that marked the first MySQL user conference independently organized by MySQL AB. It was called the “MySQL Users Conference” and took place at the Double Tree

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Learn About MySQL 5.6 at the Percona Live MySQL Conference
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5.6 has redefined MySQL performance and usability. Some great talks at the Percona Live MySQL Conference and Expo will provide insight into the new features and benefits of this major release. The conference is April 22-25, 2013 at the Santa Clara Convention Center and Hyatt Santa Clara.

Monday evening features the conference Welcome Reception where attendees can relax over food and beverages in the exhibition area following the day’s tutorials. After the Welcome Reception, at 6:30 pm, Oracle is hosting a reception to celebrate MySQL 5.6 going GA which is open to the public (but space

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10 Newer Entries Showing entries 31 to 40 of 99 10 Older Entries

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