Each row in the SYSHISTORY system view records a system operation on the database, such as a database start, a database calibration, and so on. The underlying system table for this view is ISYSHISTORY.
The SYSHISTORY view is a SQL Anywhere system view. See SQL Anywhere 11.0.1 > SQL Anywhere Server - SQL Reference > System Objects > Views > System views > SYSHISTORY system view.