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PHP 5 Social Networking by Michael Peacock

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No SQL

There are a number of database systems available that are schema-less, useful for storing large amounts of data that doesn't need to relate to other data, such as logs, pages, documents, and so on. Examples of systems available include MongoDB and CouchDB. Generally, each individual record defines its own structure and fields, allowing such systems to be flexible to the data they are needed to store.

It may be useful for us to bear this type of system in mind as we extend our site, as we may add features that would benefit from such a system, in addition to using MySQL for the rest of our site's functionality.

A large number of companies, including a number of social website companies, make use of MongoDB and have listed on the MongoDB website ...

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