Abstract: An index generation device 100 generates key presence information for a plurality of input files when lexical analysis on the plurality of input files are executed, the key presence information including information whether each of a plurality of keys is present in the plurality of input files and presence positions of the respective plurality of keys when the respective plurality of keys are present in the plurality of input files. The index generation device 100 generates index information about the keys and the positions for the plurality of input files based on the key presence information.

Abstract: An index generation device 100 generates key presence information for a plurality of input files when lexical analysis on the plurality of input files are executed, the key presence information including information whether each of a plurality of keys is present in the plurality of input files and and presence positions of the respective plurality of keys when the respective plurality of keys are present in the plurality of input files. The index generation device 100 generates index information about the keys and the positions for the plurality of input files based on the key presence information.

Abstract: A non-transitory computer-readable recording medium stores an encoding processing program that causes a computer to execute a process including: extracting processing target column information on processing target columns based on a processing instruction for a plurality of encoded tables, each of the plurality of encoded tables including a plurality of encoded column data, each of the plurality of encoded column data encoded from corresponding column data, respectively, that is delimited by a delimiter; and generating a partial encoded table including the processing target columns from the plurality of encoded tables, using the processing target column information.

Abstract: The encoding device 100 extracts, when encoding a target file by using a static dictionary unit 121 and a dynamic dictionary unit 122, a registered word included in an external dictionary unit 221 from among words registered in the dynamic dictionary unit 122, in which the external dictionary associates a specific word group and a code group with each other; and registers, in the dynamic dictionary unit 122, a code of the registered word in the external dictionary unit 221 and a dynamic code assigned dynamically in association with each other.

Abstract: The encoding device 100 extracts, when encoding a target file by using a static dictionary unit 121 and a dynamic dictionary unit 122, a registered word included in an external dictionary unit 221 from among words registered in the dynamic dictionary unit 122, in which the external dictionary associates a specific word group and a code group with each other; and registers, in the dynamic dictionary unit 122, a code of the registered word in the external dictionary unit 221 and a dynamic code assigned dynamically in association with each other.