The analytics API regularly cleans up the prediction and training samples. For that, it creates an sql statement, which has a NOT IN within its where clause. For this NOT IN it includes all ids of the analyzable of the model as parameters. For our installation and the analyzable core_user this are nearly 100,000 entries. However, the postgres implementation in php only allows 65536 parameters. Other DBMS have similar issues. I could not find a limit for mysql, but SQL Server is at 32767 (source ). Thus, the query fails