Use the inmemory_external_procedure security feature to enable or disable the server's ability to make use of high performance in-process UDFs.
A database should maintain data integrity. Under no circumstances should data be lost, modified, augmented, or corrupted. Since UDF execution happens within the SAP Sybase IQ server, there is a risk of corrupting data; practice caution with memory management and any other use of pointers. Install and execute UDFs within a read-only multiplex node. For additional protection, use the secured feature (-sf) startup option with each server to enable or disable the execution of UDF.
-sf -inmemory_external_procedure
-sf inmemory_external_procedure