Symptom:

When adding a word to the search, Primo returns more results

For example:

• Searching for one word return less results in comparison to searching for two (or more) words

Example:

Searching for documentary returns 21,473 records

Searching for documentary film returns 24,102 records

Explanation:

Primo's search engine has a sophisticated algorithm which expands and alters queries so that the results returned will be relevant to the search.

The search engine algorithm builds a series of Boolean searches which increases the relevance of the results, as opposed to an SQL search, for instance, which works in a direct manner on the data.

Among them is searching in full text of PCI records. Searching a single term in PCI's full text will , due to its sheer size, would return an extremely large amount of records, all meeting the search query but  many of them may have low relevance to the end user

Conclusion:

The results of different searches aren't necessarily comparable in a linear relation

• Article last edited: 10-Jul-2016