[B! postgres] snomofã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯

snomof id:snomof

postgresã«é–¢ã™ã‚‹snomofã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (19)

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ã‚¢ãƒ¼ã‚ãƒ†ã‚¯ãƒãƒ£ã‹ã‚‰ç†è§£ã™ã‚‹PostgreSQLã®ãƒ¬ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³
1. CopyrightÂ©2018 NTT Corp. All Rights Reserved. ã‚¢ãƒ¼ã‚ãƒ†ã‚¯ãƒãƒ£ã‹ã‚‰ç†è§£ã™ã‚‹ PostgreSQLã®ãƒ¬ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ NTT OSSã‚»ãƒ³ã‚¿ æ¾¤ç”° é›…å½¦ 2. 2CopyrightÂ©2018 NTT Corp. All Rights Reserved. è‡ªå·±ç´¹ä»‹ ïƒ˜æ¾¤ç”° é›…å½¦ ïƒ˜@sawada_masahiko ïƒ˜NTT OSSã‚»ãƒ³ã‚¿ ïƒ˜PostgreSQLã®æŠ€è¡“ã‚µãƒãƒ¼ãƒˆ ïƒ˜PostgreSQLã®æœ¬ä½“é–‹ç™º ïƒ˜PostgreSQLã®å‘¨è¾ºãƒ„ãƒ¼ãƒ«é–‹ç™º ïƒ˜ pg_repack â€“ ã‚ªãƒ³ãƒ©ã‚¤ãƒ³ãƒ¡ãƒ³ãƒ†ãƒŠãƒ³ã‚¹ãƒ„ãƒ¼ãƒ« ïƒ˜ pg_bigm â€“ 2-gramå…¨æ–‡æ¤œç´¢ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ« 3. 3CopyrightÂ©2018 NTT Corp. All Rights Reserved. â€¢ PostgreSQLã®ã‚¢ãƒ¼ã‚ãƒ†ã‚¯ãƒãƒ£ã«ã¤ã„ã¦ç°¡å˜ã«ãŠã•ã‚‰ã„ â€¢ Replication
snomof 2018/12/10
postgres
ãƒªãƒ³ã‚¯
11.5.Â Combining Multiple Indexes
A single index scan can only use query clauses that use the index's columns with operators of its operator class and are joined with AND. For example, given an index on (a, b) a query condition like WHERE a = 5 AND b = 6 could use the index, but a query like WHERE a = 5 OR b = 6 could not directly use the index. Fortunately, PostgreSQL has the ability to combine multiple indexes (including multipl
snomof 2017/09/13
postgres
ãƒªãƒ³ã‚¯
Adding new null column to table caused lock
snomof 2016/10/24
postgres
ãƒªãƒ³ã‚¯
Blog - 2ndQuadrant | PostgreSQL
snomof 2016/09/29
postgres
ãƒªãƒ³ã‚¯
Cannot install pg gem in Mavericks with Postgres.app
snomof 2016/02/10
postgres
ãƒªãƒ³ã‚¯
ï¼»PostgreSQLã‚¦ã‚©ãƒƒãƒï¼½ç¬¬17å›ž æ–°ã—ã„å®Ÿè¡Œãƒ—ãƒ©ãƒ³ãƒ»ã‚¿ã‚¤ãƒ—ã«ã‚ˆã‚‹PostgreSQL 8.1ã®æ€§èƒ½å‘ä¸Š
å‰å›žã¯é–‹ç™ºä¸ã®PostgreSQL 8.1ã§ï¼Œãƒãƒƒãƒ•ã‚¡ãƒ»ãƒžãƒãƒ¼ã‚¸ãƒ£ã«æ”¹è‰¯ãŒåŠ ãˆã‚‰ã‚Œã¦ï¼Œå¤§å¹…ãªæ€§èƒ½å‘ä¸ŠãŒã‚ã£ãŸã“ã¨ã‚’è¿°ã¹ãŸã€‚ä»Šå›žã¯åŒã˜ãæ€§èƒ½é¢ã§å¤§ããªå‰é€²ã¨ãªã‚‹ãƒ“ãƒƒãƒˆãƒžãƒƒãƒ—ãƒ»ãƒ™ãƒ¼ã‚¹ã®å®Ÿè¡Œãƒ—ãƒ©ãƒ³ãƒ»ã‚¿ã‚¤ãƒ—ãŒè¿½åŠ ã•ã‚ŒãŸã“ã¨ã‚’å ±å‘Šã™ã‚‹ã€‚ãªãŠï¼Œæœ¬ç¨¿ã§æ¤œè¨¼ã«ä½¿ç”¨ã—ãŸã®ã¯5æœˆ3æ—¥æ™‚ç‚¹ã®ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã§ã‚ã‚‹ã€‚ ã‚ªãƒ—ãƒ†ã‚£ãƒžã‚¤ã‚¶ã¨å®Ÿè¡Œãƒ—ãƒ©ãƒ³ ãã®å‰ã«ï¼ŒPostgreSQLã«ãŠã‘ã‚‹ã‚ªãƒ—ãƒ†ã‚£ãƒžã‚¤ã‚¶ã¨å®Ÿè¡Œãƒ—ãƒ©ãƒ³ã«ã¤ã„ã¦å¾©ç¿’ã—ã¦ãŠã“ã†ã€‚ ãƒ†ãƒ¼ãƒ–ãƒ«ã«ã¯ã‚¢ã‚¯ã‚»ã‚¹ã‚’é«˜é€ŸåŒ–ã™ã‚‹ãŸã‚ã«ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã‚’è¿½åŠ ã™ã‚‹ã“ã¨ãŒã§ãã‚‹ã€‚ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã¨ã¯æ—¥æœ¬èªžã§ã€Œç´¢å¼•ã€ã®ã“ã¨ã§ã‚ã‚‹ã€‚ä¾‹ãˆã°æ›¸ç±ã‚’ä¾‹ã«ã¨ã£ã¦è€ƒãˆã¦ã¿ã‚ˆã†ã€‚ã‚ã‚‹æ›¸ç±ã®ä¸ã‹ã‚‰ï¼Œã€Œç¥žå¥ˆå·çœŒã€ã«ã¤ã„ã¦æ›¸ã‹ã‚ŒãŸãƒšãƒ¼ã‚¸ã‚’æŽ¢ã—ãŸã„ã¨ã™ã‚‹ã€‚ã‚‚ã—ç´¢å¼•ãŒãªã‘ã‚Œã°æ›¸ç±ã®1ãƒšãƒ¼ã‚¸ç›®ã‹ã‚‰ä¸¹å¿µã«èªã‚“ã§ã„ãã—ã‹ãªã„ã€‚ã—ã‹ã—ç´¢å¼•ãŒã‚ã‚Œã°ï¼Œã€Œç¥žå¥ˆå·çœŒã€ã«ã¤ã„ã¦æ›¸ã‹ã‚ŒãŸãƒšãƒ¼ã‚¸ãŒã™ãã«åˆ†ã‹ã‚‹ã®ã§ï¼Œç´ æ—©ãç›®çš„ã®ãƒšãƒ¼ã‚¸ã«ãŸã©ã‚Šç€
snomof 2015/10/12
postgres

bitmapscan
ãƒªãƒ³ã‚¯
Exploring Query Locks in Postgres - Big elephants
Understanding query locking is key to using postgres concurrently. So letâ€™s look at an example to learn more about how locking works and how to see whatâ€™s going on within your database. Playing in the sandbox To play around with locks letâ€™s first create a sandbox. CREATE DATABASE sandbox; CREATE TABLE toys ( id serial NOT NULL, name character varying(36), usage integer NOT NULL DEFAULT 0, CONSTRAI
snomof 2015/09/16
postgres
ãƒªãƒ³ã‚¯
é–‹ç™ºè€…ã®ãŸã‚ã®SQLãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹ã®å…¨ã¦
å‰æ›¸ã - ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã®ä½œæˆã¯ãªãœé–‹ç™ºè€…ã®ã‚¿ã‚¹ã‚¯ãªã®ã‹ ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã® å†…éƒ¨æ§‹é€ - ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã¯ä½•ã«ä¼¼ã¦ã„ã‚‹ã‹ ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ ãƒªãƒ¼ãƒ•ãƒŽãƒ¼ãƒ‰ - äºŒé‡é€£çµãƒªã‚¹ãƒˆ æ¤œç´¢ ãƒ„ãƒªãƒ¼(Bãƒ„ãƒªãƒ¼) - ãƒãƒ©ãƒ³ã‚¹æœ¨ é…ã„ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ ãƒ‘ãƒ¼ãƒˆI - ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã‚’é…ãã™ã‚‹2ã¤ã®åŽŸå› where å¥ - æ¤œç´¢ã®ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹ã‚’æ”¹å–„ã™ã‚‹ãŸã‚ã«ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã‚’ä½œæˆ ç‰ä¾¡ æ¼”ç®—å - ä¸€è‡´ã™ã‚‹ã‚ãƒ¼ã®æ¤œç´¢ ãƒ—ãƒ©ã‚¤ãƒžãƒªã‚ãƒ¼ - ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã®ä½¿ã„æ–¹ã‚’ç¢ºèª è¤‡åˆã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ - è¤‡æ•°åˆ—ã«å¯¾ã™ã‚‹ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ é…ã„ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ ãƒ‘ãƒ¼ãƒˆII - å‰ã®å•é¡Œç‚¹ãŒå†ã³ é–¢æ•° - whereå¥ã® ä¸ã§ã®é–¢æ•° å¤§æ–‡å—ãƒ»å°æ–‡å—ã‚’åŒºåˆ¥ã™ã‚‹ æ¤œç´¢ - UPPERã¨ LOWER ãƒ¦ãƒ¼ã‚¶å®šç¾© é–¢æ•° - é–¢æ•°ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã®åˆ¶é™ ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã®ä½œã‚ŠéŽãŽ - å†—é•·æ€§ã®æŽ’é™¤æ³• ãƒ‘ãƒ©ãƒ¡ãƒ¼ã‚¿åŒ– ã‚¯ã‚¨ãƒª - ã‚»ã‚ãƒ¥ãƒªãƒ†ã‚£ã¨ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹ã®ãŸã‚ã« ç¯„å›² æ¤œ
snomof 2015/09/10
postgres
ãƒªãƒ³ã‚¯
12-Step Program for Scaling Web Applications on PostgreSQL
The document discusses scaling a web application called Wanelo that is built on PostgreSQL. It describes 12 steps for incrementally scaling the application as traffic increases. The first steps involve adding more caching, optimizing SQL queries, and upgrading hardware. Further steps include replicating reads to additional PostgreSQL servers, using alternative data stores like Redis where appropri
snomof 2015/09/06
postgres

rails

scalability

infrastructure
ãƒªãƒ³ã‚¯
MySQLä½¿ã„ãŒçŸ¥ã‚‹ã¹ãPostgreSQLã¨ã®é•ã„ã¨å¤‰ã‚ã‚‰ãªã„ä¸€ã¤ã®ã“ã¨
â€” ããƒ¼ã ã„ï¼ åˆä»£ALF (@soudai1025) 2015, 8æœˆ 24 ã¨ãƒ–ãƒ¼ãƒ¡ãƒ©ãƒ³æŠ•ã’ã¦è¦‹äº‹ã«åˆºã•ã£ã¦ã‚‹ã®ã§ä»Šã‹ã‚‰è¨˜äº‹æ›¸ãã€‚ ä¸¡ã‚µã‚¤ãƒ‰ã«ã¯ã‹ãªã‚ŠåŽ³ã—ã„è©±ã‚‚ã™ã‚‹ãŒä¿ºã®æœ¬éŸ³ã‚’è´ã„ã¦ãŠã‘ï¼ˆé–¢ç™½å®£è¨€ï¼‰ ã¾ãæ´å²ã®é•·ã„RDBãªã®ã§ãŠäº’ã„ã®æ¯”è¼ƒè¨˜äº‹ã¯æ²¢å±±ã‚ã‚‹ã€‚ ãªã®ã§ãƒžãƒ«ãƒã‚¹ãƒ¬ãƒƒãƒ‰(MySQL)ã¨ãƒžãƒ«ãƒãƒ—ãƒã‚»ã‚¹(PostgreSQL)ã ã¨ã‹VACUUMã ã£ã¦è©±ã¯ã—ãªã„ã€‚ ã‚€ã—ã‚å®Ÿéš›ã«ä½¿ã£ã¦ã¿ãŸéš›ã®é•ã„ã‚’ã«ãƒ•ã‚©ãƒ¼ã‚«ã‚¹ã™ã‚‹ã€‚ 1. SQLã®é•ã„ åŸºæœ¬çš„ã«MySQLã§ã‚„ã£ã¦ã„ãŸã“ã¨ã¯PostgreSQLå‡ºæ¥ã‚‹ã€‚ ã—ã‹ã—é–¢æ•°ã®æŒ™å‹•ã®é•ã„ã¯å¹¾ã¤ã‹ã‚ã‚‹ã€‚ ä¾‹ãˆã°æ™‚é–“ã‹ã‚‰æ›œæ—¥ã«è©²å½“ã™ã‚‹æ•°å—ã«å¤‰æ›ã—ãŸå ´åˆã« MySQLã€€â†’ã€€date_format(time,"%w")ã€€0ã‹ã‚‰å§‹ã¾ã‚Šã€æ—¥æ›œæ—¥ã«è©²å½“ã™ã‚‹ PostgreSQLã€€â†’ã€€to_char(time,'D')ã€€1ã‹ã‚‰å§‹ã¾ã‚Šã€æ—¥æ›œæ—¥ã«è©²å½“ã™ã‚‹ ãªã©æŒ™å‹•ã«äº’æ›æ€§
snomof 2015/08/25
postgres

mysql
ãƒªãƒ³ã‚¯
Index on primary key not used in simple join
snomof 2015/05/14
postgres
ãƒªãƒ³ã‚¯
Why would you index text_pattern_ops on a text column?
snomof 2014/12/13
postgres

index
ãƒªãƒ³ã‚¯
tuning postgresql for large amounts of ram
snomof 2014/12/07
postgres

database

tuning
ãƒªãƒ³ã‚¯
[PostgreSQL] å·¨å¤§ãªãƒ†ãƒ¼ãƒ–ãƒ«ã§ã‚«ãƒ©ãƒ è¿½åŠ ãƒ»å‰Šé™¤ã™ã‚‹å ´åˆã«æ°—ã‚’ä»˜ã‘ã‚‹ã¹ãã“ã¨ Â· DQNEOæ—¥è¨˜
ALTER TABLE verybigtable ADD COLUMN col_1 integer DEFAULT 0; ã“ã‚Œã¯è¦æ³¨æ„ã§ã™ã€‚ ã“ã®ã‚ˆã†ãªã“ã¨ã‚’ã™ã‚‹ã¨ã€ãƒ†ãƒ¼ãƒ–ãƒ«ã®å…¨è¡Œã«å¯¾ã—ã¦æ›´æ–°å‡¦ç†ãŒã‹ã‹ã£ã¦ã—ã¾ã„è² è·ãŒä¸€æ°—ã«ä¸Šæ˜‡ã—ã¾ã™ã€‚ ã‚µãƒ¼ãƒ“ã‚¹ç¨¼åƒä¸ã«ã‚«ãƒ©ãƒ è¿½åŠ ã™ã‚‹å ´åˆã¯ã€DEFAULTåˆ¶ç´„ã¯ã¤ã‘ãªã„æ–¹ãŒã‚ˆã„ã§ã—ã‚‡ã†ã€‚ ã©ã†ã—ã¦ã‚‚DEFAULTåˆ¶ç´„ã‚’ã¤ã‘ãŸã„å ´åˆã¯ã€ ï¼‘ï¼Žã‚µãƒ¼ãƒ“ã‚¹åœæ¢ã—ã¦ã‹ã‚‰ä¸Šè¨˜ã®ADD COLUMNã‚’å®Ÿè¡Œã™ã‚‹ ã¾ãŸã¯ã€ ï¼’ï¼Žã„ã£ãŸã‚“DEFAULTãªã—ã§ã‚«ãƒ©ãƒ è¿½åŠ ã—ã¦ã€ç›´å¾Œã«DEFAULTåˆ¶ç´„ã‚’ã¤ã‘ã‚‹ ALTER TABLE verybigtable ADD COLUMN col_1 integer; ALTER TABLE verybigtable ALTER COLUMN col_1 SET DEFAULT 0; ã¨ã„ã†ï¼’ã¤ã®æ–¹æ³•ãŒã‚ã‚Šã¾ã™ã€‚ æ–¹æ³•ï¼’ã®å ´åˆã¯ã€è² è·ã¯å…¨
snomof 2014/11/02
postgres
ãƒªãƒ³ã‚¯
PostgreSQL Internals
æœ¬ã‚³ãƒ³ãƒ†ãƒ³ãƒ„ã¯ã€2014å¹´1æœˆ30ï½ž31æ—¥ã«ç‘æ³¢å¤§å¦ã§é–‹è¬›ã•ã‚ŒãŸã€Œæƒ…å ±ã‚·ã‚¹ãƒ†ãƒ ç‰¹åˆ¥è¬›ç¾©Dã€ã«ãŠã‘ã‚‹è¬›ç¾©ã€ŒInside PostgreSQL Kernelã€ã®å†…å®¹ã‚’å†æ§‹æˆã€åŠ ç†ãƒ»ä¿®æ£ã—ãŸã‚‚ã®ã§ã™ã€‚ ã¯ã˜ã‚ã« æœ¬ã‚³ãƒ³ãƒ†ãƒ³ãƒ„ã«ã¤ã„ã¦ æœ¬ã‚³ãƒ³ãƒ†ãƒ³ãƒ„ã¸ã®ãƒ•ã‚£ãƒ¼ãƒ‰ãƒãƒƒã‚¯ã«ã¤ã„ã¦ ã‚¢ãƒ¼ã‚ãƒ†ã‚¯ãƒãƒ£æ¦‚è¦ PostgreSQLã®æ§‹æˆè¦ç´ PostgreSQLã®åŸºæœ¬çš„ãªã‚¢ãƒ¼ã‚ãƒ†ã‚¯ãƒãƒ£ SQLæ–‡ã®å‡¦ç†ã•ã‚Œã‚‹æµã‚Œ ãƒˆãƒ©ãƒ³ã‚¶ã‚¯ã‚·ãƒ§ãƒ³ç®¡ç† ãƒˆãƒ©ãƒ³ã‚¶ã‚¯ã‚·ãƒ§ãƒ³å‡¦ç†ã«ãŠã‘ã‚‹ACIDç‰¹æ€§ å„ãƒ¬ã‚³ãƒ¼ãƒ‰ã®å¯è¦–æ€§ã®ç®¡ç† Atomicityï¼ˆåŽŸåæ€§ï¼‰ã®å®Ÿè£… Consistencyï¼ˆä¸€è²«æ€§ï¼‰ã®å®Ÿè£… Isolationï¼ˆåˆ†é›¢æ€§ï¼‰ã®å®Ÿè£… ãƒˆãƒ©ãƒ³ã‚¶ã‚¯ã‚·ãƒ§ãƒ³åˆ†é›¢ãƒ¬ãƒ™ãƒ«ã®å®šç¾© Durabilityï¼ˆæ°¸ç¶šæ€§ï¼‰ã®å®Ÿè£… ãƒã‚§ãƒƒã‚¯ãƒã‚¤ãƒ³ãƒˆ ãƒ¡ã‚¿ãƒ‡ãƒ¼ã‚¿ç®¡ç† pg_controlãƒ•ã‚¡ã‚¤ãƒ« OID/XID/TID ã‚·ã‚¹ãƒ†ãƒ ã‚«ã‚¿ãƒã‚° MVCCã¨ã‚¹ãƒˆãƒ¬ãƒ¼ã‚¸æ§‹é€ ãƒ†
snomof 2014/05/05
pgã®åŸºç¤Žã‚‚å‹‰å¼·ã—ãªã„ã¨ã¨æ€ã£ã¦ã„ãŸã‚‰ã€ã†ã¡ã®å¤§å¦ã§ã‚ã£ã¡ã‚ƒè‰¯ã„æŽˆæ¥ã‚ã£ãŸã£ã½ã„

postgres
ãƒªãƒ³ã‚¯
GitHub - heroku/heroku-pg-extras: A heroku plugin for awesome pg:* commands that are also great and fun and super.
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snomof 2014/04/03
Heroku

memory

postgres
ãƒªãƒ³ã‚¯
PostgreSQL Index Only Scan å¥®é—˜è¨˜ ãã®3 | TECHSCORE BLOG | TECHSCORE BLOG
ã©ã†ã‚‚ã€‚æ‘ä¸Šã§ã™ã€‚ ä»Šå›žã§3å›žç›®ã®PostgreSQLã§ã™ã€‚ ä»Šã¯ã“ã‚“ãªæ„Ÿã˜ã§ã™ã€‚ è¿½è¨˜åž‹ã‚¢ãƒ¼ã‚ãƒ†ã‚¯ãƒãƒ£ ãƒã‚ãƒ¥ãƒ¼ãƒ Visibility Mapã€€ã€€â† å‰å›žã“ã“ã¾ã§ ãƒ—ãƒ©ãƒ³æ¼”ç®—å â† ä»Šå›žã“ã“ Index Only Scan ã§ã¯ã€Œãƒ—ãƒ©ãƒ³æ¼”ç®—åã€ã„ã£ã¦ã¿ã‚ˆã†ï¼ï¼ ãƒ—ãƒ©ãƒ³æ¼”ç®—åï¼Ÿï¼Ÿï¼Ÿ ãƒ—ãƒ©ãƒ³æ¼”ç®—åã£ã¦ã‚ã¾ã‚Šèžããªã‚Œãªã„ã§ã™ã‘ã©ã€ç°¡å˜ã«è¨€ã†ã¨ã€Œexplainã€ã—ãŸã‚‰å‡ºã¦ãã‚‹ã‚¢ãƒ¬ã§ã™ã€‚ =# explain select * from users; QUERY PLAN ------------------------------------------------------------------- Seq Scan on users (cost=0.00..385179.80 rows=10010480 width=190)
snomof 2014/04/03
postgres

db
ãƒªãƒ³ã‚¯
Heroku â€œpsql: FATAL: remaining connection slots are reserved for non-replication superuser connectionsâ€
snomof 2014/02/25
Heroku

postgres
ãƒªãƒ³ã‚¯
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snomof 2013/08/21
DB

postgresql

postgres
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