Questions tagged [Databases] (3154)

A problem essence in the following: you want to store in the database information about the state of the object (for example, monitor the valve at the pumping station of the second lifting). Parameters for the observed unit can be a lot is temperature, vibration, currents, percent of rotation. In addition, you must keep the...

You want to create a database model (or data warehouse), which would store not only the current state, as in conventional operational databases, but also the entire history of changes made to any attribute of any entity at the time to know everything in any time slice, as is done with aggregated data in data warehouses. But...

I want to log in, because I recently found out that BerkeleyDB does not object to the database. Who can describe the classification, or at least sent to the normal website, and can be gourmet. There is one idea, feel the heart, to database it need it object. Thanks in advance.

Good afternoon. There is a strange dilemma in the implementation of the review on the website. It is expected that there will be a large number of articles (actually not articles, but that's not the point) and the actual (frequently requested) only a small part of them, with a small period of time actual move these to the...

Please advise: pure Java, Schema, less embedded, in memory database. To use as a cache of object properties. Well or other variants how to organize the cache :) Thank you!

That's right, I remembered, roughly similar to my problem: Yandex.Market selection of gamers Look at the panel on the right, a wonderful all sorts of criteria to choose can be up and running very quickly. How to make such things? What approaches are used, the device database? Ideally you need a universal mechanism that cou...

if there are any applications to work for example with SQLite on Windows Mobile? Only interested in finding records on the selected database and displays them. Or any more or less open counterparts database. Search on Google gave nothing.

Good day, dear. If anyone knows of any of You existing NoSQL open source distributed database, primarily focused on storage arrays and matrices containing double and int, and also with the possibility of expanding the search functions. The presence of client libraries for PHP/Python is a huge plus.

Working to create a tourism website. Need somewhere to take the base all the cities and countries of the world in Russian. Probably somewhere already, but I can not find.

How you can deploy a database only for one project? Let's say I killed him and I want to restore from a backup, but only data.yml and schema.rb.