Abstract: A database system operates by: generating first segment addendum data indicating at least one addendum part indicating at least one change to a first segment of a plurality of segments, updating segment part activation data to indicate a first ownership sequence number (OSN) range for activation of the first segment addendum data during query execution, executing a first query, having a first ownership sequence number, based on accessing the first segment in response to first data ownership information tagged with the first ownership sequence number indicating activation of the first segment, and further based on foregoing applying of the at least one addendum part for the first segment in response to the first ownership sequence number falling outside of the first OSN range indicated in the segment part activation data for the first segment addendum data, and executing a second query, having a second ownership sequence number, based on accessing the first segment in response to second data ownership informat

Abstract: A database system is operable to execute a query transaction to generate addendum part data updating a segment A target storage node receives a plurality of sets of buffered rows and a plurality of flush requests. The target storage nodes each of a plurality of addendum parts in response to receiving a corresponding one of a plurality of flush requests. The target node assigns a plurality of version numbers to the plurality of addendum parts. A coordinator operator execution module commits only a final addendum part having a most recent version number as the addendum part data for the segment.