| 摘要 |
A computer implemented method maps an index of information of a database into an array of files. The information is stored as records of a database. Batches of records are parsed into words and locations, each word representing a portion of the information of a particular record, the locations are sequentially assigned to the words in the order of parsing the words. An index entry is generated for each unique word, each index entry including the unique word and all of the locations where the unique word occurs in the database. Each unique word is hashed to determine a bucket number. Index entries having identical bucket numbers are written to a single index file associated with the bucket number in a collating order of the unique words. A summary file is generated for each index file by periodically sampling the data being written to the index file. Index files and their associated summary files are grouped into a tier of files, there being one tier for each batch of records parsed.
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