Ben Johnson, forfatteren af NoSQL-lagringssystemet BoltDB, har pr\u00e6senteret projektet Litestream, der tilbyder et lag til organisering af datareplication i SQLite. Litestream kr\u00e6ver ingen \u00e6ndringer i SQLite og kan arbejde med alle applikationer, der bruger dette bibliotek. Replication h\u00e5ndteres af en separat k\u00f8rende baggrundsproces, der overv\u00e5ger \u00e6ndringer i databaserne og flytter dem til en anden fil eller et eksternt lager. Projektkoden er skrevet i Go og distribueres under Apache 2.0-licensen. <\/p>\n
Al interaction med databasen foreg\u00e5r gennem det indbyggede SQLite API, dvs. Litestream blander sig ikke direkte i driften, p\u00e5virker ikke ydeevnen og kan ikke beskadige indholdet af databasen, hvilket adskiller Litestream fordelagtigt fra l\u00f8sninger som Rqlite og Dqlite. \u00c6ndringer overv\u00e5ges ved at aktivere WAL-loggen (\"Write-Ahead Log\") i SQLite. For at spare plads i lageret aggregerer systemet regelm\u00e6ssigt \u00e6ndringsstr\u00f8mmen til snapshots af databasen, oven p\u00e5 hvilke andre \u00e6ndringer begynder at samle sig. Tiden for oprettelse af snapshots angives i indstillingerne, for eksempel kan man generere snapshots \u00e9n gang dagligt eller \u00e9n gang i timen. <\/p>\n
Som de prim\u00e6re anvendelsesomr\u00e5der for Litestream n\u00e6vnes organisationen af sikker backup og fordeling af l\u00e6sebelastning p\u00e5 flere servere<\/a>. \u00c6ndringsstr\u00f8mmen underst\u00f8ttes overf\u00f8rsel til lager som Amazon S3, Azure Blob Storage, Backblaze B2, DigitalOcean Spaces, Scaleway Object Storage, Google Cloud Storage, Linode Object Storage eller til enhver ekstern v\u00e6rt, der underst\u00f8tter SFTP-protokollen. I tilf\u00e6lde af beskadigelse af indholdet i den prim\u00e6re database kan en backup gendannes fra en tilstand, der svarer til et angivet tidspunkt, en bestemt \u00e6ndring, den seneste \u00e6ndring eller et angivet snapshot. \u0411\u0435\u043d \u0414\u0436\u043e\u043d\u0441\u043e\u043d (Ben Johnson), \u0430\u0432\u0442\u043e\u0440 NoSQL-\u0445\u0440\u0430\u043d\u0438\u043b\u0438\u0449\u0430 BoltDB, \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b \u043f\u0440\u043e\u0435\u043a\u0442 Litestream, \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0438\u0439 \u043d\u0430\u0434\u0441\u0442\u0440\u043e\u0439\u043a\u0443 \u0434\u043b\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u0440\u0435\u043f\u043b\u0438\u043a\u0430\u0446\u0438\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u0432 SQLite. 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Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"