Yes, there are several open-source databases available. Links to several of these databases can be found here: http://www.freebyte.com/programming/database/.
Databank (usually a device) containing several databases.
Databases are important because of several reasons.......
No, but there are several databases that have a number of artifacts.
In many cases, each company has its own database (or several databases), so I would estimate that there are about as many databases as there are companies. If you are referring to the DBMS - the software that manages the databases - you can see a list of the most common ones in the following Wikipedia articles: * Comparison of relational database management systems * Comparison of object database management systems * Comparison of object-relational database management systems
There are several online resume database sites. Some of the sites with resume databases include Zillion Resumes, Jobvertise, Career Bank, and Broker Hunter.
A "database" is a collection of information, often organized in tables. OSPF routers - i.e., routers that implement the OSPF routing protocols - need to maintain several databases, for example, a neighbor database (a list of connected neighbors), and a link-state database (a list of all the connections between different routers in the same area, which the router has learned about).
There are several types of databases- such as "relational" (Oracle for example). Multi-user database is a database that contains (normally) several "tables" where each table has rows and columns, and where these rows and columns intersect is a "data element". Multi user databases support several concurrent users (simultaneous) for reading or writing data to the tables in the database. For example, a list of addresses, phone numbers and names for a city could be a table. With other tables having other demographic data. Several users could "search" for a variety of combinations of this data, while another group of users could be adding more "records" (data elements).
In a Relational Database or a Flat Database a table contains an organized collection of records, each of which contains several fields of data describing the item that the record represents.In other types of databases tables may or may not exist.
There are several computer programs and applications that work together to organize the data in search engine programs into large databases. These programs are overseen by database managers.
Some of the advantages of relational databases include the ability to link information about a particular person who is in several databases together by simple links. One disadvantage is that once the database is created it is not changed easily so any database forming as part of a relational database must be very carefully planed before anything else can be done
A DBA is often a Database Administrator, however this job does not make much money on average and usually several databases are managed by one person.