Increasing storage space for processes impacting data storage systems

A computer program product for managing data storage, the computer program product comprising:

• one or more computer readable storage media;
• and
• program instructions stored on the one or more computer readable storage media, the program instructions comprising:
• program instructions to receive a request to extract an input file located on a source device, transform the input file to an output file via a data processing process, and load the output file on a target device;
• program instructions to initiate transformation of the input file to the output file using the data processing process;
• and
• program instructions to determine an expected storage size for the output file prior to completing the data processing process based on (i) a selection of a subset of fields during processing, of fields of the input file, (ii) a row count for the input file and (iii) a largest possible row size for the output file, wherein determining the expected storage size for the output file prior to completing the data processing process further comprises multiplying the largest row size in the fields by the largest row size possible in order to determine the expected storage size.

A computer system for managing data storage, the computer program product comprising, the computer system comprising:

• one or more computer processors;
• one or more computer readable storage media;
• and
• program instructions, stored on the one or more computer readable storage media for execution by at least one of the one or more computer processors, the program instructions comprising:
• program instructions to receive a request to extract an input file located on a source device, transform the input file to an output file via a data processing process, and load the output file on a target device;
• program instructions to initiate transformation of the input file to the output file using the data processing process;
• and
• program instructions to determine an expected storage size for the output file prior to completing the data processing process based on (i) a selection, during processing, of a subset of fields of the input file, (ii) a row count for the input file and (iii) a largest possible row size for the output file, wherein determining the expected storage size for the output file prior to completing the data processing process further comprises multiplying the largest row size in the fields by the largest row size possible in order to determine the expected storage size.