[B! index] ohbaryeã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯

ohbarye id:ohbarye

indexã«é–¢ã™ã‚‹ohbaryeã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (4)

${{author_name}}$

{{{comment_expanded}}}

{{label}}

{{#is_bookmark}}ãƒªã‚¹ãƒˆ{{/is_bookmark}}{{^is_bookmark}}ãƒªãƒ³ã‚¯{{/is_bookmark}}

${{author_name}}$
{{author_name}}{{created}}
{{ #comment }}{{ comment }}{{ /comment }}
- {{ label }}

${{author_name}}$

{{{comment_expanded}}}

{{label}}

{{#is_bookmark}}ãƒªã‚¹ãƒˆ{{/is_bookmark}}{{^is_bookmark}}ãƒªãƒ³ã‚¯{{/is_bookmark}}

MySQLã¨ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã¨ç§
2021/05/24 ã‚µã‚¤ãƒœã‚¦ã‚ºé–‹é‹ç ”ä¿® å‹•ç”»ãŒä»¥ä¸‹ã®ã‚µã‚¤ãƒˆã‹ã‚‰ãƒªãƒ³ã‚¯ã•ã‚Œã¦ã„ã¾ã™ - https://blog.cybozu.io/entry/2021/07/20/100000 - ã“ã‚Œã«çŸ¢å°ã‚’æ›¸ããªãŒã‚‰ãã‚Šãã‚Šã‚„ã£ã¦ã„ãŸã‚ã‘ãªã®ã§ã€è³‡æ–™å˜ä½“ã ã¨ã‚ã‹ã‚Šã¥ã‚‰ã„ã¨æ€ã„ã¾ã™â€¦
ohbarye 2021/06/06
mysql

development

database

db

innodb

index
ãƒªãƒ³ã‚¯
SQLã®ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã¨ãã®ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã«ã¤ã„ã¦ã®ã‚ªãƒ³ãƒ©ã‚¤ãƒ³ãƒ–ãƒƒã‚¯
é–‹ç™ºè€…å‘ã‘ã®SQLã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹è§£èª¬ã‚µã‚¤ãƒˆã€ç®¡ç†ã«ã¤ã„ã¦ã®é–“é•ã„ãªã„çŸ¥è˜ã‚’æä¾›ã—ã¾ã™ã€‚ ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã¯é–‹ç™ºæ™‚ã«ã¯å¿˜ã‚Œã‚‰ã‚ŒãŒã¡ã§ã‚ã‚‹ä¸€æ–¹ã§ã€éžå¸¸ã«åŠ¹æžœçš„ãªSQLã®ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°æ–¹æ³•ã§ã™ã€‚Use The Index, Lukeã§ã¯ã€Hibernateãªã©ã®ORMãƒ„ãƒ¼ãƒ«ã®è§£èª¬ã«ã¨ã©ã¾ã‚‰ãšã€SQLã®ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã«ã¤ã„ã¦åŸºç¤Žã‹ã‚‰èª¬æ˜Žã—ã¾ã™ã€‚ Use The Index, Lukeã¯SQLãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹è©³è§£ã®Webä¸Šã®ç„¡æ–™ç‰ˆã§ã™ã€‚ã‚µã‚¤ãƒˆã‚’æ°—ã«å…¥ã£ã¦é ‚ã‘ãŸã‚‰ã€ãœã²æ›¸ç±ã‚‚è³¼å…¥ã—ã¦ã¿ã¦ä¸‹ã•ã„ã€‚ã¾ãŸã€ã“ã®ã‚µã‚¤ãƒˆã®é‹å–¶ã‚’ã‚µãƒãƒ¼ãƒˆã™ã‚‹æ§˜ã€…ãªã‚°ãƒƒã‚ºã‚‚è²©å£²ã—ã¦ã„ã¾ã™ã€‚ MySQLã€Oracleã€SQL Serverãªã©ã«ãŠã‘ã‚‹SQLã®ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹Use The Index, Lukeã§ã¯ã€ãƒ™ãƒ³ãƒ€ã«ã¨ã‚‰ã‚ã‚Œãªã„ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã®èª¬æ˜Žã‚’å¿ƒãŒã‘ã¦ã„ã¾ã™ã€‚è£½å“ç‰¹æœ‰ã®äº‹æŸ„ã«ã¤ã„ã¦ã¯ã€ä»¥ä¸‹ã®ã‚ˆã†ãªè¡¨ç¤ºã‚’ã—ã¦ã„ã¾ã™ã€‚ Db2 (LUW)U
ohbarye 2020/06/13
SQL

db

database

index
ãƒªãƒ³ã‚¯
ãªãœBTreeãŒIndexã«ä½¿ã‚ã‚Œã¦ã„ã‚‹ã®ã‹ - maru source
â€»ã“ã®å†…å®¹ã¯å€‹äººçš„ãªè€ƒå¯Ÿãªã®ã§ã€é–“é•ã£ã¦ã„ã‚‹ç®‡æ‰€ã‚‚ã‚ã‚‹ã¨æ€ã„ã¾ã™ã€‚ãã†ã„ã†éƒ¨åˆ†ã‚’è¦‹ã¤ã‘ãŸéš›ã¯ãœã²æ•™ãˆã¦ä¸‹ã•ã„ã€‚ RDBMSã®æ¤œç´¢ã‚’æ—©ãã™ã‚‹ãŸã‚ã«Indexã£ã¦ä½¿ã„ã¾ã™ã‚ˆãã€‚ä¾‹ãˆã°ã“ã‚“ãªãƒ†ãƒ¼ãƒ–ãƒ« CREATE TABLE user ( id INT UNSIGNED NOT NULL, name VARCHAR(255) NOT NULL, UNIQUE INDEX (id) ); idã‚«ãƒ©ãƒ ã«Indexã‚’å¼µã£ã¦ã„ã¾ã™ã€‚ã“ã‚Œã¯idã§ã®æ¤œç´¢ã‚’é«˜é€Ÿã«ã™ã‚‹ãŸã‚ã§ã™ã€‚ã“ã“ã§idã‚«ãƒ©ãƒ ã«IndexãŒè²¼ã£ã¦ã„ãªã„å ´åˆã¨æ¯”ã¹ã‚‹ã¨æ¤œç´¢æ™‚é–“ãŒå¤§å¹…ã«å¤‰ã‚ã£ã¦ãã¦ã—ã¾ã„ã¾ã™ï¼ˆç‰¹ã«ãƒ¬ã‚³ãƒ¼ãƒ‰ãŒå¤šããªã£ãŸæ™‚) ã§ã¯ãªãœIndexã‚’è²¼ã‚‹ã¨æ¤œç´¢ãŒæ—©ããªã‚‹ã‚“ã§ã—ã‚‡ã†ï¼Ÿï¼Ÿ Indexã¨ã¯ãã®åã®é€šã‚Šç´¢å¼•ã‚’æ„å‘³ã—ã¾ã™ã€‚ç‰¹å®šã®ã‚«ãƒ©ãƒ ã®ç´¢å¼•ã‚’ä½œæˆã—ã¦ãŠãã“ã¨ã§æ¤œç´¢ã‚’é«˜é€ŸåŒ–ã—ã¾ã™ã€‚ (æœ¬ã®æœ€å¾Œã«ã‚ˆã¿ãŒãªé †ã§å˜èªžãŒä¸¦ã¹ã‚‰ã‚ŒãŸã‚Šã—ã¦ã„ã¾ã™
ohbarye 2019/12/31
btree

index

db

algorithm

database
ãƒªãƒ³ã‚¯
MySQL with InnoDB ã®ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã®åŸºç¤ŽçŸ¥è˜ã¨ã‚ã‚ŠãŒã¡ãªé–“é•ã„ - ã‚¯ãƒƒã‚¯ãƒ‘ãƒƒãƒ‰é–‹ç™ºè€…ãƒ–ãƒã‚°
ã“ã‚“ã«ã¡ã¯ã€ã‚µãƒ¼ãƒ“ã‚¹é–‹ç™ºéƒ¨ã®è’å¼• (@a_bicky) ã§ã™ã€‚ çªç„¶ã§ã™ãŒã€RDBMS ã®æ—¢å˜ã®ãƒ†ãƒ¼ãƒ–ãƒ«ã‚’è¦‹ã¦ã¿ãŸã‚‰ã€Œä½•ã§ã“ã‚“ãªã«ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã ã‚‰ã‘ãªã®ï¼Ÿã€ã¿ãŸã„ãªçµŒé¨“ã¯ã‚ã‚Šã¾ã›ã‚“ã‹ï¼Ÿä¸è¦ãªã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã¯å®¹é‡ã‚’åœ§è¿«ã—ãŸã‚Šã€æŒ¿å…¥ãŒé…ããªã£ãŸã‚Šã¨è‰¯ã„ã“ã¨ãŒã‚ã‚Šã¾ã›ã‚“ã€‚ ãã‚“ãªã‚ã‘ã§ã€ä»Šå›žã¯ãƒ¬ã‚³ãƒ¼ãƒ‰ã‚’æ¤œç´¢ã™ã‚‹ãŸã‚ã«å¿…è¦ãªã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã®åŸºç¤ŽçŸ¥è˜ã¨ã€ã‚ˆãè¦‹ã‹ã‘ã‚‹ä¸é©åˆ‡ãªã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã«ã¤ã„ã¦è§£èª¬ã—ã¾ã™ã€‚ã‚¯ãƒƒã‚¯ãƒ‘ãƒƒãƒ‰ã§ã¯ Rails ã®ãƒ‡ãƒ¼ã‚¿ãƒ™ãƒ¼ã‚¹ã¨ã—ã¦ä¸»ã« MySQL 5.6ã€MySQL ã®ã‚¹ãƒˆãƒ¬ãƒ¼ã‚¸ã‚¨ãƒ³ã‚¸ãƒ³ã¨ã—ã¦ä¸»ã« InnoDB ã‚’ä½¿ã£ã¦ã„ã‚‹ã®ã§ã€MySQL 5.6 ã® InnoDB ã«ã¤ã„ã¦è§£èª¬ã—ã¾ã™ã€‚ InnoDB ã®ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã«é–¢ã™ã‚‹åŸºç¤ŽçŸ¥è˜ ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã®æ§‹é€ (B+ æœ¨) InnoDB ã§ã¯ B+ æœ¨ãŒä½¿ã‚ã‚Œã¦ã„ã¾ã™ã€‚B+ æœ¨ã¯æ¬¡ã®ã‚ˆã†ãªç‰¹å¾´ã‚’æŒã£ãŸæœ¨æ§‹é€ ã§ã™ã€‚ æ¬¡æ•°ã‚’ b ã¨ã™ã‚‹ã¨ã€
ohbarye 2019/06/23
innodb

mysql

db

index
ãƒªãƒ³ã‚¯
1