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<dt style="clear: both; float: left; font-weight: bold; width: 8em">Author</dt>
<dd style="margin-left: 8.5em">Kouhei Sutou <kou****@clear*****></dd>
<dt style="clear: both; float: left; font-weight: bold; width: 8em">Date</dt>
<dd style="margin-left: 8.5em">2011-09-27 20:59:48 +0900 (Tue, 27 Sep 2011)</dd>
<dt style="clear: both; float: left; font-weight: bold; width: 8em">New Revision</dt>
<dd style="margin-left: 8.5em"><a href="https://github.com/mroonga/mroonga/commit/b1e5a336306af2449aa305953b576c714d26404a">b1e5a336306af2449aa305953b576c714d26404a</a></dd>
<dt style="clear: both; float: left; font-weight: bold; width: 8em">Log</dt>
<dd style="margin-left: 8.5em"><pre style="border: 1px solid #aaa; font-family: Consolas, Menlo, "Liberation Mono", Courier, monospace; line-height: 1.2; padding: 0.5em">[doc] update characteristic.</pre></dd>
<dt style="clear: both; float: left; font-weight: bold; width: 8em">Modified files</dt>
<dd style="margin-left: 8.5em">
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<li><a href="https://github.com/mroonga/mroonga/commit/b1e5a336306af2449aa305953b576c714d26404a#diff-0">doc/ja/source/characteristic.rst</a></li>
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<pre style="border: 0; font-family: Consolas, Menlo, "Liberation Mono", Courier, monospace; line-height: 1.2; margin: 0; padding: 0.5em; white-space: normal"><span class="diff-header" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre"> Modified: doc/ja/source/characteristic.rst (+16 -4)</span>
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<pre style="border: 0; font-family: Consolas, Menlo, "Liberation Mono", Courier, monospace; line-height: 1.2; margin: 0; padding: 0.5em; white-space: normal"><span class="diff-hunk-header" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">@@ -23,7 +23,6 @@ <span class="diff-context" style="background-color: #ffffaa; color: #000000">TritonnではMySQLサーバのソースコードを直接修正していまし</span></span>
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<span class="diff-not-changed" style="display: block; white-space: pre"> 一方、groongaストレージエンジンはPluggable Storage Engineインタフェースを利用した独立したプログラム(共有ライブラリ)であるため、MySQLの公式バイナリに手を加えずにプラグインとして動的にロードして利用することが可能となっています。これによりTritonnよりもさらに手軽に利用できるようになりました。</span>
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<span class="diff-not-changed" style="display: block; white-space: pre"> 更新性能の向上</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> --------------</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> Sennaと比較するとgroongaではインデックス追加/更新時のスループットが大幅に改善されています。</span>
<span class="diff-hunk-header" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">@@ -35,10 +34,16 @@ <span class="diff-context" style="background-color: #ffffaa; color: #000000">groongaストレージエンジンでもこの更新性能の向上の恩恵を</span></span>
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<span class="diff-not-changed" style="display: block; white-space: pre"> TritonnではMyISAMストレージエンジンを利用していたため、データ更新(インデックス更新)が発生するとテーブル全体に排他ロックがかかり、検索処理が阻害される問題がありました。</span>
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<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-groongaストレージエンジンではこの問題がなくなり(参照ロックフリー)検索性能も向上しています。</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+groongaストレージエンジンではこの問題がなくなり(参照ロックフリー)、特にデータ更新が多いケースでの検索性能が向上しています。</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+位置情報検索のサポート</span>
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<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+groongaにはインデックスを利用した高速な位置情報検索機能があります。また、MySQLにも位置情報検索のための記法があります。groongaストレージエンジンでは、groognaの位置情報検索機能を使ってMySQLの位置情報の記法で書かれたSQLを実行するため、高速に位置情報検索を行うことができます。</span>
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<span class="diff-not-changed" style="display: block; white-space: pre"> groongaストレージファイル経由でのシステム連携</span>
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<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+---------------------------------------------</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> groongaストレージエンジンではgroongaのDB APIを使用してデータの格納を行っています。この時作成されるストレージファイルはgroonga単体でデータ管理を行う場合と同じフォーマットとなります。つまり以下のような使い方も可能となります。</span>
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<span class="diff-not-changed" style="display: block; white-space: pre"> * groongaストレージエンジン(MySQL)経由で格納したデータをgroongaサーバ(単体)の高度な検索機能を利用して検索</span>
<span class="diff-hunk-header" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">@@ -46,6 +51,14 @@ <span class="diff-context" style="background-color: #ffffaa; color: #000000">groongaストレージエンジンではgroongaのDB APIを使用してデータ</span></span>
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<span class="diff-not-changed" style="display: block; white-space: pre"> またgroongaのストレージファイルは複数プロセスや複数スレッドで共有することができますので、同じストレージファイルに対して複数パタンでの同時アクセスも可能です。</span>
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<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+他のストレージエンジンとの連携</span>
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<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+groongaストレージエンジンには2つの動作モードがあります。</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+1つが「ストレージモード」で、データストアも検索機能もすべてgroongaを使うモードです。これがデフォルトのモードです。上述の参照ロックフリーなgroongaの性能特性をフルに活かした高速なデータ更新・全文検索・位置情報検索が特長です。一方、トランザクションなどの機能は提供されません。</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+もう1つが「ラッパーモード」で、MyISAMやInnoDBといった他のストレージエンジンに *全文検索機能だけ* を追加するモードです。このモードではトランザクションなど他のストレージエンジンがサポートしている機能に加えてgroongaの高速な全文検索機能を利用することができます。一方、groongaの参照ロックフリーな特性は活かすことができません。また、更新処理は他のストレージエンジンがボトルネックになることが多いでしょう。</span>
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<span class="diff-not-changed" style="display: block; white-space: pre"> サポートしているプラットフォーム</span>
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<span class="diff-hunk-header" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">@@ -53,4 +66,3 @@ <span class="diff-context" style="background-color: #ffffaa; color: #000000">groongaストレージエンジンではgroongaのDB APIを使用してデータ</span></span>
<span class="diff-not-changed" style="display: block; white-space: pre"> 現在サポートしているプラットフォームは以下の通りです。</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
<span class="diff-not-changed" style="display: block; white-space: pre"> * Linux x86_64 (Intel64/AMD64)</span>
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