Method, program and apparatus for document retrieval system

A method for performing a system of retrieving documents,

• the system of retrieving documents comprising an input unit receiving a query condition about retrieving documents;
• a document retrieval computing-apparatus for retrieving documents based on the query condition;
• and an output unit for outputting a result from retrieving the documents,
• the document retrieval computing-apparatus comprising:
• a first storage unit;
• a second storage unit;
• and
• a processing unit;
• the second storage unit storing documents to be retrieved, and
• from the first storage unit, data of the stored documents being readable by the processing unit faster than from the second storage unit,
• the method for performing the system of retrieving documents comprising following steps:
• by using the processing unit,
• acquiring available data storage capacity on the first storage unit;
• extracting data by the acquired available data storage capacity from each of the documents to be retrieved stored on the second storage unit;
• and
• storing the extracted data as partial document of the target document onto the first storage unit,
• performing a first retrieval of the partial documents stored on the first storage unit, thereby extracting documents that meet the query condition received through the input unit from the documents to be retrieved,
• for those documents that are determined not to meet the query condition based on a result from the first retrieval, performing a second retrieval of the documents to be retrieved stored on the second storage unit, thereby extracting documents that meets the query condition from the documents to be retrieved stored on the second storage unit, and
• as results from the first and second retrievals, outputting through the output unit the documents to be retrieved that are determined to meet the query condition as hit documents, which are extracted through the first and second retrievals,
• wherein,
• by using the processing unit,
• when storing the partial documents on the first storage unit,
• acquiring a number of the documents to be retrieved stored on the second storage unit,
• calculating an allocated capacity of the memory per partial document by dividing the available data storage capacity by the acquired number of the documents to be retrieved;
• and
• extracting data by the calculated allocated capacity of the memory per partial document from each document to be retrieved, and storing the extracted data onto the first storage unit.

A document retrieval computing-apparatus included in a system of retrieving documents, which comprises an input unit receiving a query condition about retrieving documents, the document retrieval computing-apparatus for retrieving documents based on the query condition, and an output unit for outputting results from retrieving the documents,

• the document retrieval computing-apparatus comprising:
• a first storage unit,
• a second storage unit, and
• a processing unit,
• the second storage unit storing documents to be retrieved,
• from the first storage unit, data of the stored documents being readable by the processing unit faster than from the second storage unit, and
• the processing unit:
• acquiring available data storage capacity on the first storage unit;
• extracting data by the acquired available data storage capacity from the documents to be retrieved stored on the second storage unit;
• and
• storing the extracted data as partial documents of the documents to be retrieved onto the first storage unit,
• performing a first retrieval of the partial documents stored on the first storage unit, thereby extracting the documents that meet the query condition received through the input unit from the documents to be retrieved,
• for the documents that are determined not to meet the query condition based on a result from the first retrieval, performing a second retrieval of the documents to be retrieved stored on the second storage unit, thereby extracting the documents that meet the query condition from the documents to be retrieved stored on the second storage unit, and
• as results from the first and second retrievals, outputting through the output unit the documents to be retrieved that are determined to meet the query condition as hit documents, which are extracted through the first and second retrievals.