MSmerge_genhistory

The MSmerge_genhistory table contains one row for each generation that a Subscriber knows about (within the retention period). It is used to avoid sending common generations during exchanges and to resynchronize Subscribers that are restored from backups. This table is stored in the publication and subscription databases.

Column name	Data type	Description
guidsrc	uniqueidentifier	Global identifier of the changes identified by generation at the Subscriber.
guidlocal	uniqueidentifier	Local identifier of the changes identified by generation at the Subscriber.
pubid	uniqueidentifier	Publication identifier.
generation	int	Generation value.
art_nick	int	Nickname for the article.
nicknames	varbinary(1000)	A list of nicknames of other Subscribers that are known to already have this generation. Used to avoid sending a generation to a Subscriber that has already seen those changes. Nicknames in the nicknames list are maintained in sorted order to make searches more efficient. If there are more nicknames than can fit in this field, they will not benefit from this optimization.
coldate	datetime	Date when current generation is added to the table.