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In the default configuration, the data file is created as a CSV file for each transferred package. Each data file has an iteration (package) number appended to its name and is stored in the destination defined by File storage options within the Glue table. The data file naming can be configured using Glue Settings - Binary Storage settings using parameter Binary data file name.
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In case One file extraction is enabled within a Glue table, the iteration (package) number is not included within the filename, resulting in the extraction into one file. However, two different extractions will create two files, depending on Glue Settings - Binary Storage settings. Also, this option cannot be combined with the Compress file.
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In the default configuration, if extraction reads 0 lines from the source object (e.g. empty delta load), no data file is transferred to the target storage. However, it is possible to customize this behavior using Glue Settings - Binary Storage settings using parameter Generate CSV data file for empty load. If empty data files are enabled, even an empty load will create a data file on target storage, respecting other settings of the Glue table (e.g. Include table header).
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The name of the metadata files is defined and can be configured via Glue Settings - Binary storage settings using parameter Binary request metadata file name.
Also, the generation of the JSON metadata files for empty loads can be switched on/off via Glue Settings - Binary storage settings using parameter Generate JSON metadata file for empty load. If set on (default value = “X“) the JSON metadata will be generated and transferred to target storage even for extraction, that read 0 records from source object (e.g. empty delta load). If switched off, no metadata will be generated and transferred for such loads.