MySQL: innotopとサンプリング - interdb’s blog
以下、DBマガジン2010年7月号の草稿から innotop innotopを使えば、現在どんなSQLが実行されているかをリアルタイムで知ることができる。 ここでは簡単な使い方と応用編としてSQLのサンプリング、および解析スクリプトを紹介する。 ダウンロードは以下のURLから行う。 innotopはperlスクリプトなので、MySQLに接続するためのモジュール(DBIやDBD)を予めインストールしておくこと。 http://sourceforge.net/projects/innotop/ ダウンロードしたアーカイブを展開したら、以下の手順を実行する。デフォルトでは/usr/bin以下にインストールされる。 $ tar xvfz innotop-1.6.0.tar.gz $ cd innotop-1.6.0 $ perl Makefile.PL $ make $ make install初
PK Fukuoka : PK3on7
Our Third PK Night Is Coming on July 23PK Fukuoka is happy to announce the date, time and venue for PK3on7. Our third PK will be Saturday, July 23, 2011 at the Lighthouse at Bayside Place. This time our theme is "3on7". It is our third PK Night and we will hold it in the month of July. Also we hope to have three Japanese presentations and seven English. Our venue will be the Lighthouse. A large ba
InnoDB Flushing: Theory and Solutions
I mentioned problems with InnoDB flushing in a previous post. Before getting to ideas on a solution, let’s define some terms and take a look into theory. The two most important parameters for InnoDB performance are innodb_buffer_pool_size and innodb_log_file_size. InnoDB works with data in memory, and all changes to data are performed in memory. In order to survive a crash or system failure, InnoD
Ultimate MySQL variable and status reference list
I am constantly referring to the amazing MySQL manual, especially the option and variable reference table. But just as frequently, I want to look up blog posts on variables, or look for content in the Percona documentation or forums. So I present to you what is now my newest Firefox toolbar bookmark: an option and variable reference for all three sites in one! abort_slave_event_count blog perc
InnoDB Flushing: a lot of memory and slow disk
You may have seen in the last couple of weekly news posts that Baron mentioned we are working on a new adaptive flushing algorithm in InnoDB. In fact, we already have three such algorithms in Percona Server (reflex, estimate, keep_average). Why do we need one more? Okay, first let me start by showing the current problems, and then we will go to solutions. The basic problem is that, unfortunately,
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Different flavors of InnoDB flushing