Mongodb

MongoDBDobré zléa ošklivé Lukáš @almadcz Linhart

Jak si stojíte?

Not Only SQL "Idea je, že tak jako si vybíráte operační systémy a tak jako si vybíráte programovací jazyky a takjako si vybíráte frameworky, můžete si vybrat databázové architektury." Justin Sheehy (CTO Basho, Riak)

ACIDAtomicitaKonzistenceIzolaceTrvalost

BASEBasically AvailableSoft state/Eventually consistent

...pokud ji chcete udělat

Proč měnit?

SledováníUdálostí

...a krabičky...

Přímočaré![ # levy sloupec [ {cotoje : aktualne widget,pocetclanku : 7}, {cotoje : muj widget, cotamje :RSSko}, ], # další sloupec

...ups(BLOCKINGLY) ALTER TABLE 8GB_configuration_tableADD DOWNTIMEWHERE RPS > XXAND lupa_cz_hate > 500

Tak.Jednoduché.

...jen vypustit data...

...ve...{ formátu pro : [ RealTime Web, HTML 5, Web 2.0, Web 3.0, // all cool kids SF-based, YC-funded start-up ]}

...binárně rychle (BSON)

Replica Set(jako cluster zadarmo)

Rychlééé!

"Líné" úpravy schématu

Automatickérozdělování

Replikace per dotaz

...napříč datacentry

Vnitřní indexy

MapReduce

GridFS

Updaty na místě

"Při použití kill -9 není žádná záruka ohledně toho, co se podaří a co se nepodaří obnovit. Jak stará je poslední záloha?" -- Eliot Horowitz

"Kdykoli na to sáhnu, tak se to rozbije"-- Petr Svoboda, provozák

32 bitů

Jednovlákno pro zápis

Jak rychle umím psát...

Pozor na znalosti. a předpoklady (hlavně školní)

Nevidím schéma

Nebezpečný zápis... ...je nebezpečný

Eventuelní konzistence je složitá. Produktově.

Na velikosti záleží

Replikační set není load (write) balancing

Pozor na bindingy

Failover == downtime

Zabrané místodb.coll.runCommand( "compact" ) ...bez indexů

Máteproblém?Upgrade!

Co si odnést• MongoDB je Dobré• ...ale vyzkoušejte na co• Ověřujte předpoklady• 40 let stability relačních databází• Nejprve CAP, potom produkt• Podívejte se i na alternativyCouch, Riak, HBase, Cassandra...•Buďte připraveni na změnu•

Otázky?

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Mongodb

by almadcz on Sep 23, 2011

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Mongodb — Presentation Transcript