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I am a newbie in NoSQL databases and this may sound a bit stupid but I was wondering if NoSQL databases use or need indexes? If yes, how to make or manage them? any links? Thanks
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There are many indexing data structures used in NoSQL databases. We will briefly discuss some of the more common methods; namely, B-Tree indexing, T-Tree indexing, and O2-Tree indexing.
NoSQL databases store data in a single data format, including a JSON document, rather than the traditional table structure of a relational database. Because this non-relational database architecture doesn't really need a structure, it can quickly handle massive, often unorganized data sets.
To define NoSQL, it is helpful to start by describing SQL, which is a query language used by RDBMS. Relational databases rely on tables, columns, rows, or schemas to organize and retrieve data. In contrast, NoSQL databases do not rely on these structures and use more flexible data models.
Does NoSQL have a schema? NoSQL databases do not have a schema in the same rigid way that relational databases have a schema. Each of the four main types of NoSQL database has an underlying structure that is used to store the data.
CouchDB and MongoDB definitely yes. I mentioned that in my book:
Here are the respective docs:
NoSQL is, however, too fragmented to give a definite "yes, all NoSQL systems need indexes", I believe. Most systems require and provide indexes but not at level most SQL databases do. Recently, the Cassandra people were proudly introducing secondary indexes, i.e., more than a single clustered index.
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