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I have to index different kinds of data (text documents, forum messages, user profile data, etc) that should be searched together (ie, a single search would return results of the different kinds of data).
What are the advantages and disadvantages of having multiple indexes, one for each type of data?
And the advantages and disadvantages of having a single index for all kinds of data?
Thank you.
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Why is Lucene faster? Lucene is very fast at searching for data because of its inverted index technique. Normally, datasources structure the data as an object or record, which in turn have fields and values.
In Lucene, a Document is the unit of search and index. An index consists of one or more Documents. Indexing involves adding Documents to an IndexWriter, and searching involves retrieving Documents from an index via an IndexSearcher.
The Inverted Index is the basic data structure used by Lucene to provide Search in a corpus of documents. It's pretty much quite similar to the index in the end of a book.
If you want to search all types of document with one search , it's better that you keep all types to one index . In the index you can define more field type that you want to Tokenize or Vectore them . It takes a time to introduce to each IndexSearcher a directory that include indeces .
If you want to search terms separately , it would better that index each type to one index . single index is more structural than multiple index.
In other hand , we can balance our loading with multiple indeces .
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