Abstract: A method of generating a delta instructions record for updating a source database in-place, comprising obtaining a plurality of source data items contained in a plurality of cells of a plurality of tables organized in tuples and columns, creating a column oriented source stream serializing the source data items by concatenating a source data item of each cell of each column to a preceding source data item of a cell preceding the respective cell in the respective column, obtaining a plurality of target data items contained tables of a target database comprising data item(s) changed compared to the source database, creating a column oriented target stream serializing the plurality of target data items, delta instructions for applying changes detected between the source database and the target database by comparing between the source stream and the target stream, and outputting the delta instructions record to device(s) for updating their source database.

Abstract: A method of generating a delta instructions record for updating a source database in-place, comprising obtaining a plurality of source data items contained in a plurality of cells of a plurality of tables organized in tuples and columns, creating a column oriented source stream serializing the source data items by concatenating a source data item of each cell of each column to a preceding source data item of a cell preceding the respective cell in the respective column, obtaining a plurality of target data items contained tables of a target database comprising data item(s) changed compared to the source database, creating a column oriented target stream serializing the plurality of target data items, delta instructions for applying changes detected between the source database and the target database by comparing between the source stream and the target stream, and outputting the delta instructions record to device(s) for updating their source database.