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DBD::SQLite 1.41_01 - Charsbar::Note
SQLite 3.8.0 ãŒå‡ºãŸã®ã§ã€DBD::SQLiteã«ãƒãƒ³ãƒ‰ãƒ«ã•ã‚Œã¦ã„るライブラリも更新ã—ã¦ã€1.41_01ã¨ã—ã¦ãƒªãƒªãƒ¼ã‚¹ã—ã¾ã—ãŸã€‚SQLite 3.8.0ã§ã¯ã‚¯ã‚¨ãƒªãƒ—ランナーãŒä¸€æ–°ã•ã‚Œã¦ã„ã‚‹ã»ã‹ã€where節ã§é™å®šã™ã‚‹éƒ¨åˆ†ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã‚‚利用ã§ãるよã†ã«ãªã£ã¦ã„ã¾ã™ã€‚ æ–°ã—ã„クエリプランナーã®è©³ç´°ã«ã¤ã„ã¦ã¯ä¸‹è¨˜ã‚’ã©ã†ãžã€‚ http://www.sqlite.org/queryplanner-ng.html ç§è‡ªèº«ã¯ã¾ã 使ã„込んã§ã„ã¾ã›ã‚“ãŒã€SQLiteã®ä½œè€…æ°ã«ã‚ˆã‚Œã°ã€sqlite.orgã§2ヶ月以上使ã£ã¦ã¿ãŸã‘ã‚Œã©ã‚‚å•é¡Œã¯å‡ºã¦ã„ãªã„ã¨ã®ã“ã¨ã€‚DBD::SQLiteã®ãƒ†ã‚¹ãƒˆã‹ã‚‰åˆ¤æ–ã™ã‚‹é™ã‚Šã€ä»Šå›žã®å¤‰æ›´ã«ã‚ˆã£ã¦ä½™åˆ†ãªsortãŒã²ã¨ã¤æ¸›ã£ãŸã‚Šã—ã¦ã„ã¾ã™ã®ã§ã€é€šå¸¸ã¯æ–°ã—ã„クエリプランナーã®æ–¹ãŒå¤šã‹ã‚Œå°‘ãªã‹ã‚Œã‚ˆã„çµæžœãŒæœŸå¾…ã§ãã‚‹ã¯ãšã§ã™ãŒã€å‰å›žã®ã‚¯ã‚¨ãƒªã‚ªãƒ—ティマイザ最é©åŒ–ã®ã¨ãã«ã‚‚ã‚ã£ãŸã‚ˆ
DBD::SQLite 1.39 - Charsbar::Note
æ°—ãŒã¤ã‘ã°å‰å›žã®å®‰å®šç‰ˆã‚’出ã—ã¦ã‹ã‚‰ä¸¸ä¸€å¹´ãŒéŽãŽã¦ã—ã¾ã„ã¾ã—ãŸãŒã€ã‚ˆã†ã‚„ãDBD::SQLiteã®1.39をリリースã—ã¾ã—ãŸã€‚ ãã‚Œãžã‚Œä»¥å‰ã«ã‚‚書ã„ãŸã“ã¨ã§ã™ãŒã€ä»Šå›žã®1.39ã§ã¯immediate transactionをデフォルトã«ã—ãŸã®ã¨ã€ã‚¯ã‚¨ãƒªã‚ªãƒ—ティマイザ最é©åŒ–ã«ã‚ˆã£ã¦ORDER BYã®ãªã„SELECTæ–‡ã®è¿”り値ã®ä¸¦ã³é †ãŒã“ã‚Œã¾ã§ã¨ç•°ãªã£ãŸã‚‚ã®ã«ãªã‚‹å¯èƒ½æ€§ãŒã‚ã‚‹ã®ãŒå¤§ããªå¤‰æ›´ç‚¹ã§ã™ã€‚ ã¾ãŸã€ã‚„や地味ãªå¤‰æ›´ã§ã™ãŒã€ã‚«ãƒ©ãƒ åãªã©ã«utf8æ–‡å—列ãŒå«ã¾ã‚Œã¦ã„ã‚‹å ´åˆã®å‡¦ç†ãŒæ”¹å–„ã•ã‚ŒãŸã»ã‹(jamadam++)ã€bind_paramã«æ¸¡ã™å¤‰æ•°ã‚’å†åˆ©ç”¨ã—よã†ã¨ã—ãŸã¨ãã«èµ·ã“ã‚‹å•é¡Œã‚‚ä¿®æ£ã•ã‚Œã¾ã—ãŸã€‚ 最近ã®DBD::SQLiteãŒOpenBSDを除ãBSDç³»ã®ã‚·ã‚¹ãƒ†ãƒ ã§ã‚¹ãƒ¬ãƒƒãƒ‰å¯¾å¿œç‰ˆã®Perlを使ã£ã¦ã„ã‚‹ã¨ãã«ã†ã¾ãコンパイルã§ãã¦ã„ãªã‹ã£ãŸä»¶ã‚‚暫定的ã«å¯¾å¿œã—ã¦ã‚ã‚Šã¾ã™ã€‚ ãã®ä»–ã€ç´°ã‹ã„変更点ã«
DBD::SQLite 1.39 | Kenichi Ishigaki [blogs.perl.org]
It's been a year since DBD::SQLite team released the last stable version of DBD::SQLite (1.37). The team has added a few new features to retrieve database information, and applied a number of bug fixes thanks to the community, most notably the one to address an issue where bind_param didn't work with PADTMP scalars (RT #79576). Also, two significant changes have been made; one by us, and the other
Improve INSERT-per-second performance of SQLite
Optimizing SQLite is tricky. Bulk-insert performance of a C application can vary from 85 inserts per second to over 96,000 inserts per second! Background: We are using SQLite as part of a desktop application. We have large amounts of configuration data stored in XML files that are parsed and loaded into an SQLite database for further processing when the application is initialized. SQLite is ideal
DBD::SQLiteã§ä½œæˆã—ãŸãƒ‡ãƒ¼ã‚¿ãƒ™ãƒ¼ã‚¹ãŒsqlite3コマンドã§é–‹ã‘ãªã„å ´åˆ - Charsbar::Note
以å‰ã“ã¡ã‚‰ã§ã‚‚書ã„ãŸé€šã‚Šã€DBD::SQLite 1.37以é™ã§ã¯ãƒãƒ³ãƒ‰ãƒ«ã—ã¦ã„ã‚‹SQLiteライブラリã®ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆã®ãƒ•ã‚¡ã‚¤ãƒ«ãƒ•ã‚©ãƒ¼ãƒžãƒƒãƒˆãŒå¤‰æ›´ã«ãªã£ãŸãŸã‚ã€ã€ŒPRAGMA legacy_file_format=ONã€ã‚’有効ã«ã—ãªã„ã¨2006年以å‰ã®SQLiteã§ã¯èªã‚ãªããªã‚‹ã¨ã„ã†å•é¡ŒãŒã‚ã‚‹ã®ã§ã™ãŒã€ãã‚Œã¨ã¯åˆ¥ã«ã€SQLite 3.7以é™ã§æ–°è¨ã•ã‚ŒãŸWAL (Write Ahead Logging)ã¨ã„ã†æ©Ÿèƒ½ã‚’使ã†ã¨ã€ãƒãƒ¼ã‚¸ãƒ§ãƒ³3.7よりå‰ã®sqlite3コマンドã§ã¯ã€Œfile is encrypted or is not a databaseã€ãªã©ã¨ã„ã‚ã‚Œã¦è©²å½“ã®ãƒ‡ãƒ¼ã‚¿ãƒ™ãƒ¼ã‚¹ãŒé–‹ã‘ãªããªã‚Šã¾ã™ã€‚ 詳細ã«ã¤ã„ã¦ã¯ä¸‹è¨˜ã®ãƒªãƒ³ã‚¯ã‚’ã”覧ã„ãŸã ãã¨ã—ã¦ã€ãƒ‡ãƒ¼ã‚¿ãƒ™ãƒ¼ã‚¹ã‚’é–‹ã„ãŸã¨ãã«-walã¨ã‹-shmã¨ã„ã†æŽ¥å°¾è¾žã®ã¤ã„ãŸãƒ•ã‚¡ã‚¤ãƒ«ãŒã§ãã‚‹å ´åˆã¯ã“ã®æ©Ÿèƒ½ãŒå¦¨ã’ã«ãªã£ã¦ã„ã‚‹ã‚‚ã®ã¨æ€ã‚ã‚Œã¾ã™ã®ã§ã€æœ€è¿‘ã®D
SQLite ã®ãƒ‘フォーマンスãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã€ã¾ãŸã¯ DBIx::Sunny 0.16 ã®è©± - blog.nomadscafe.jp
GrowthForecastãŒMySQL対応ã—ãŸãã£ã‹ã‘ã¨ã—ã¦SQLiteã®dead lockå•é¡ŒãŒã‚ã£ãŸã®ã§ã™ãŒã€PRAGMAã§ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã™ã‚‹ã¨ãƒ‘フォーマンスãŒçµæ§‹å¤‰ã‚ã‚‹ã“ã¨ãŒã‚ã‹ã£ãŸã®ã§ãƒ¡ãƒ¢ã€‚ ã‚„ã£ãŸã®ã¯ã€journal_mode 㨠synchronous ã®å¤‰æ›´ã€‚ãã‚Œãžã‚Œ > PRAGMA journal_mode = DELETE | TRUNCATE | PERSIST | MEMORY | WAL | OFF > PRAGMA synchronous = 0 | OFF | 1 | NORMAL | 2 | FULL ã®ã‚ˆã†ãªæ„Ÿã˜ã§å¤‰æ›´ã§ãる。 ãã‚Œãžã‚Œã®è¨å®šã¯ã€ PRAGMA Statements - synchronous PRAGMA Statements - journal_mode ã‚’ã¿ã‚‹ã®ãŒè‰¯ã„ã¨æ€ã†ã€‚journal_mode ã«æŒ‡å®šã§ãã‚‹WALã«ã¤ã„ã¦ã¯æ¬¡ã®ãƒš
SQLite Optimization FAQ
Jim Lyon (jplyon@attglobal.net) 10-Sep-2003 Compiled from sqlite docs, source, and yahoo postings This document is current for SQLite 2.8.6 1. Introduction 1.1. About this FAQ This FAQ is an incomplete summary of my experiences with speed-optimizing an application that uses the SQLite library. It will be of most use to people who are already familiar with using SQLite. Feel free to send any que
Write-Ahead Logging
1. Overview The default method by which SQLite implements atomic commit and rollback is a rollback journal. Beginning with version 3.7.0 (2010-07-21), a new "Write-Ahead Log" option (hereafter referred to as "WAL") is available. There are advantages and disadvantages to using WAL instead of a rollback journal. Advantages include: WAL is significantly faster in most scenarios. WAL provides more con
SQLite 3.7ç™»å ´ã€é«˜é€Ÿã‚³ãƒŸãƒƒãƒˆ/ãƒãƒ¼ãƒ«ãƒãƒƒã‚¯WAL実装実ç¾
SQLite is a software library that implements a self-contained, serverless, zero-configuration, transactional SQL database engine. 22æ—¥(米国時間)ã€SQLiteã®æœ€æ–°ç‰ˆã¨ãªã‚‹SQLite 3.7.0ãŒå…¬é–‹ã•ã‚ŒãŸã€‚SQLiteã¯ã‚‚ã£ã¨ã‚‚広ã使ã‚ã‚Œã¦ã„る組ã¿è¾¼ã¿å‘ã‘データベースã®ã²ã¨ã¤ã€‚パブリックドメインã®ã‚‚ã¨ã§æä¾›ã•ã‚Œã¦ã„ã‚‹ãŸã‚組ã¿è¾¼ã¿ã«æŽ¡ç”¨ã™ã‚‹ã®ã«éƒ½åˆãŒã‚ˆãã€ã¾ãŸãƒãƒ©ãƒ³ã‚¹ã®ã„ã„機能å–æ¨ã‚„性能ãŒè©•ä¾¡ã•ã‚Œã¦ã„る。Firefoxã‚„Thunderbirdã§æ ¹å¹¹ã‚’ãªã™ã‚³ãƒ³ãƒãƒ¼ãƒãƒ³ãƒˆã¨ã—ã¦æŽ¡ç”¨ã•ã‚Œã¦ã„ã‚‹ã»ã‹ã€Operaã§ã‚‚採用ã•ã‚Œã¦ã„ã‚‹ 。ã»ã‹ã«ã‚‚採用事例ã¯å¤šã„。 SQLite 3.7.0ã§ã‚‚ã£ã¨ã‚‚注目ã•ã‚Œã‚‹ã®ã¯WAL (Write-Ahead Logging)ã¨å‘¼ã°ã‚Œã‚‹
DBD::SQLite 1.30_02 - Charsbar::Note
ã‚ã¨ã€å…ˆæ—¥ãƒªãƒªãƒ¼ã‚¹ã—ãŸDBD::SQLite 1.30_02ã®å¤‰æ›´ç‚¹ã«ã¤ã„ã¦ã€‚ DBD::SQLiteã¯ã“ã‚Œã¾ã§ DBIãŒç”¨æ„ã—ãŸæž 組ã¿ã®ç¯„囲内ã§ã®ãƒˆãƒ©ãƒ³ã‚¶ã‚¯ã‚·ãƒ§ãƒ³ã‚’利用ã—ã¦ã„ã‚‹(AutoCommit/begin_work) fork()ãªã©ã‚’利用ã—ã¦ä¸¦åˆ—性を高ã‚ã¦ã„ã‚‹ èªã¿æ›¸ãを平行ã—ã¦è¡Œã£ã¦ã„ã‚‹ ã¨ã„ã£ãŸæ¡ä»¶ãŒé‡ãªã£ãŸã¨ãã«ãƒˆãƒ©ãƒ³ã‚¶ã‚¯ã‚·ãƒ§ãƒ³ãŒãƒ‡ãƒƒãƒ‰ãƒãƒƒã‚¯ã™ã‚‹ã“ã¨ãŒã‚ã‚‹ã€ã¨ã„ã†å•é¡Œã‚’抱ãˆã¦ã„ã¾ã—ãŸã€‚最å°é™ã®å†ç¾ã‚³ãƒ¼ãƒ‰ã¯ã“ã‚“ãªæ„Ÿã˜ã«ãªã‚Šã¾ã™ã€‚ use strict; use warnings; use DBI; my $pid = fork(); if ($pid) { do_transaction(); } else { sleep 1; do_transaction(); exit; } unlink 'test.db'; sub do_transaction { my $dbh =
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SQLite ã®å…¨æ–‡æ¤œç´¢ã‚’ Python ã‹ã‚‰ä½¿ã£ã¦ã¿ã‚‹ (1) - 傀儡師ã®é¤¨.Python：楽天ブãƒã‚°
2007.07.27 SQLite ã®å…¨æ–‡æ¤œç´¢ã‚’ Python ã‹ã‚‰ä½¿ã£ã¦ã¿ã‚‹ (1) テーマ：プãƒã‚°ãƒ©ãƒŸãƒ³ã‚°è¨€èªž Python を使ã†(339) カテゴリ：Python SQLite ã®å…¨æ–‡æ¤œç´¢ FTS2 ã‚’ã¡ã‚‡ã£ã¨è©¦ã—ã¦ã¿ãŸã€‚ã ãŒã€çµè«–ã‹ã‚‰è¨€ãˆã°ã€Python ã‹ã‚‰ FTS2 を使ã†ã®ã¯ã¾ã ã¡ã‚‡ã£ã¨è¾›ã„。ã¨ã„ã†ã‹ã€FTS2 ã§æ—¥æœ¬èªžã‚’使ã†ã®ã¯ã¾ã è¾›ã„ã¨ã“ã‚ãŒã‚る。ã‘ã‚Œã©ã€ã¾ã£ãŸã使ãˆãªã„ã¨ã„ã†ã“ã¨ã¯ãªã„ã®ã§ã‚„ã£ã¦ã¿ã‚‹ã€‚ Full-text Search for SQLite 㯠FTS1 㨠FTS2 ã® 2ã¤ã®ãƒãƒ¼ã‚¸ãƒ§ãƒ³ãŒã‚る。ã©ã¡ã‚‰ã‚‚ SQLite ã®å¤–部モジュールã¨ã—ã¦é–‹ç™ºã•ã‚Œã¦ã„る。FTS1 ã®ãƒ‘フォーマンスを改善ã—ã¦ã„ã‚‹ã®ãŒ FTS2。FTS1 㨠FTS2 ã¯äº’æ›æ€§ãŒãªã„ã®ã§ã€å¾Œã€…ã®ã“ã¨ã‚’考ãˆã‚‹ã¨ä»Šã‹ã‚‰ FTS2 を使ã£ã¦ãŠã„ãŸæ–¹ãŒã‚ˆã„よã†ã 。表é¢ä¸Šã®ä½¿ã„方㯠FTS1 ã‚’
101å·å®¤: [sqlite] SQLiteã«RAND()関数を追åŠ
å‰ã®è¨˜äº‹ã¸ « [perl] Text::CSV::Simple | トップページ | typekeyç¥ã‚Š 次ã®è¨˜äº‹ã¸ 2006å¹´04月15æ—¥ [sqlite] SQLiteã«RAND()é–¢æ•°ã‚’è¿½åŠ SQLiteã§ãƒ©ãƒ³ãƒ€ãƒ ã«åè¡Œå–り出ãã†ã¨ã—㦠SELECT * FROM hogehoge ORDER BY RAND() LIMIT 10; ã“ã‚“ãªSQLを入れãŸã‚‰ã‚¨ãƒ©ãƒ¼ãŒå‡ºãŸã€‚ RAND()関数ãŒç„¡ã„ã®ãŒåŽŸå› ã®ã‚ˆã†ãªã®ã§ã€è‡ªåˆ†ã§ä½œã£ã¦ã¿ãŸã€‚ $dbh->func( "rand", -1, sub{ rand(shift || 1) }, "create_function" ); my ($count) = $dbh->selectrow_array('SELECT RAND(10)'); 29日追記 random()ãŒã‚ã£ãŸ 自己紹介 ã¼ãã¡ã‚ƒã‚“ï¼ï¼ã“ã‚“ã«ã¡ã¯ã“ã‚“ã«ã¡ã¯ï¼
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