Database

Facebook Twitter

Distributed-computation

Tokyocabinet. Sql. The arrow of time - A short time with MongoDB. I have created a port for FreeBSD 8 for MongoDB but I won't be using it for anything because of these things I found out about it: MongoDB has no, worth repeating: NO provisions for on-disk consistency.

The arrow of time - A short time with MongoDB

It doesn't fsync, it doesn't use algorithms that would ensure some degree of safety (e.g. journalling), nothing. It does lazy writes! Which means that in case of server or process crashes (which will happen with 100% probability) the whole database could very trivially be corrupted beyond repair. For someone like me who comes from the "real" database world, this makes it unusable.Its performance sucks. Apparently, the developers are willing to work on solving the data consistency issue (which will probably mean they'll have to abandon the pure-mmap approach or at least make very careful use of fsync()s) some time in the future, but I am puzzled by the low performance. 플래시 카페 (Flash,액션,소스,강좌,포토샵,PHP,자바스크립트)

Igvita.com. Anti-RDBMS: A list of distributed key-value stores. Update 8: Introducing MongoDB by Eliot Horowit.

Anti-RDBMS: A list of distributed key-value stores

Update 7: The Future of Scalable Databases by Robin Mathew. Update 6: NoSQL : If Only it Was that Easy. BJ Clark lays down the law on which databases are scalable: Tokyo - NO, Redis - NO, Voldemort - YES, MongoDB - Not Yet, Cassandra - Probably, Amazon S3 - YES * 2, MySQL - NO. The real thing to point out is that if you are being held back from making something super awesome because you can’t choose a database, you are doing it wrong.Update 5: Exciting stuff happening in Japan at this Key-Value Storage meeting in Tokyo. Presentations on Groonga, Senna, Lux IO, Tokyo-Cabinet, Tx, repcached, Kai, Cagra, kumofs, ROMA, and Flare. Update 4: NoSQL and the Relational Model: don’t throw the baby out with the bathwater by Matthew Willson.

Richard Jones has put together a very nice list of various key-value stores around the internets. Yet another Key-Value database. Following the NoSQL movement, I became a fan of key-value databases.

Yet another Key-Value database

Usually there’s nothing interesting to say as they work fine out-of-the-box. But in a project I was recently working on K-V store started to be a major bottleneck. I must note that my use case is pretty specific. In a K-V database I store about ten million records. The keys are pretty small, about 12 bytes on average. I experimented with Berkeley DB and Tokyo Cabinet, but I noticed that both engines do similar things internally. Lux IO - Yet Another Fast Database Manager. Primary Keys: IDs versus GUIDs.

Berners-Lee: Semantic Web's success lies in cooperation. Getting Started with Berkeley DB XML. Database Editions and Options Oracle Database 12c comes in three editions and features a wide range of enterprise edition options to meet specific customer requirements in the areas of performance and availability, security and compliance, data warehousing and analytics, unstructured data, and manageability.

Getting Started with Berkeley DB XML

Oracle Database Appliance The Oracle Database Appliance is an engineered system of software, servers, storage, and networking that provides a simple, reliable, and affordable way to deploy, manage, and support high-availability database workloads. Data Warehousing Oracle Database 12c, complete with in-database advanced analytics, introduces new integration, performance, scalability, and analytics capabilities that support data warehouses and big data, providing a fast, cost-effective platform for data warehousing and business intelligence applications. High Availability Storage Management Oracle Multitenant Big Data Database Clouds Database Security Oracle TimesTen In-Memory Database.

Library of Free Data Model.