aslheapsz - Application support layer heap size.
The application support layer heap represents a communication buffer between the local application and its associated agent. This buffer is allocated as shared memory by each database manager agent that is started.
它是local app和agent通信的buffer，占用实例共享内存空间。
相关的APAR(V97):
IT01380: FALSE COMMUNICATION ERROR DETECTED BETWEEN DB2FMP PROCESS AND DB2 EDU LEADING TO INCORRECT SQL1646N ERROR RETURNED
IC91371: WITH DATA_ENCRYPT A QUERY MAY FAIL AND RETURN SQL0902C.
IC86889: FENCED WRAPPER GETS HANG SPORADICALLY AFTER -1131 ERROR
IC85503: ACCESSING DB2/Z OS WITH CLI MAY ENCOUNTER -904 ERROR
IC79080: WITH DATA_ENCRYPT, WHEN USING COMMUNICATION BUFFER GREATER THAN 32K, RUNNING A QUERY MAY FAIL AND RETURN SQL0902C.
IC68230: A QUERY RETURNING A BIGGER RESULT SET MAY FAIL WITH SQL0902C, WHEN USING COMMUNICATION BUFFER GREATER 32K AND DATA_ENCRYPT
rqrioblk - Client I/O block size.
This parameter specifies the size of the communication buffer between remote applications and their database agents on the database server. It is also used to determine the I/O block size at the Data Server Runtime Client when a blocking cursor is opened.
它是remote client和server通信的buffer，占用每个agent的私有内存空间。
IC79080: WITH DATA_ENCRYPT, WHEN USING COMMUNICATION BUFFER GREATER THAN 32K, RUNNING A QUERY MAY FAIL AND RETURN SQL0902C.
IC68230: A QUERY RETURNING A BIGGER RESULT SET MAY FAIL WITH SQL0902C, WHEN USING COMMUNICATION BUFFER GREATER 32K AND DATA_ENCRYPT
原文地址：http://masaly.blog.51cto.com/9302075/1637943
